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@ -0,0 +1,735 @@
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Noteworthy changes in GCC version 2.7.2: |
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A few bugs have been fixed (most notably the generation of an |
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invalid assembler opcode on some RS/6000 systems). |
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Noteworthy changes in GCC version 2.7.1: |
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This release fixes numerous bugs (mostly minor) in GCC 2.7.0, but |
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also contains a few new features, mostly related to specific targets. |
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Major changes have been made in code to support Windows NT. |
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The following new targets are supported: |
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2.9 BSD on PDP-11 |
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Linux on m68k |
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HP/UX version 10 on HP PA RISC (treated like version 9) |
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DEC Alpha running Windows NT |
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When parsing C, GCC now recognizes C++ style `//' comments unless you |
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specify `-ansi' or `-traditional'. |
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The PowerPC System V targets (powerpc-*-sysv, powerpc-*-eabi) now use the |
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calling sequence specified in the System V Application Binary Interface |
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Processor Supplement (PowerPC Processor ABI Supplement) rather than the calling |
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sequence used in GCC version 2.7.0. That calling sequence was based on the AIX |
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calling sequence without function descriptors. To compile code for that older |
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calling sequence, either configure the compiler for powerpc-*-eabiaix or use |
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the -mcall-aix switch when compiling and linking. |
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Noteworthy changes in GCC version 2.7.0: |
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GCC now works better on systems that use ".obj" and ".exe" instead of |
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".o" and no extension. This involved changes to the driver program, |
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gcc.c, to convert ".o" names to ".obj" and to GCC's Makefile to use |
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".obj" and ".exe" in filenames that are not targets. In order to |
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build GCC on such systems, you may need versions of GNU make and/or |
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compatible shells. At this point, this support is preliminary. |
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Object file extensions of ".obj" and executable file extensions of |
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".exe" are allowed when using appropriate version of GNU Make. |
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Numerous enhancements were made to the __attribute__ facility including |
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more attributes and more places that support it. We now support the |
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"packed", "nocommon", "noreturn", "volatile", "const", "unused", |
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"transparent_union", "constructor", "destructor", "mode", "section", |
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"align", "format", "weak", and "alias" attributes. Each of these |
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names may also be specified with added underscores, e.g., "__packed__". |
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__attribute__ may now be applied to parameter definitions, function |
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definitions, and structure, enum, and union definitions. |
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GCC now supports returning more structures in registers, as specified by |
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many calling sequences (ABIs), such as on the HP PA RISC. |
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A new option '-fpack-struct' was added to automatically pack all structure |
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members together without holes. |
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There is a new library (cpplib) and program (cppmain) that at some |
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point will replace cpp (aka cccp). To use cppmain as cpp now, pass |
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the option CCCP=cppmain to make. The library is already used by the |
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fix-header program, which should speed up the fixproto script. |
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New options for supported targets: |
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GNU on many targets. |
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NetBSD on MIPS, m68k, VAX, and x86. |
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LynxOS on x86, m68k, Sparc, and RS/6000. |
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VxWorks on many targets. |
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Windows/NT on x86 architecture. Initial support for Windows/NT on Alpha |
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(not fully working). |
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Many embedded targets, specifically UDI on a29k, aout, coff, elf, |
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and vsta "operating systems" on m68k, m88k, mips, sparc, and x86. |
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Additional support for x86 (i386, i486, and Pentium): |
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Work with old and new linkers for Linux-based GNU systems, |
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supporting both a.out and ELF. |
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FreeBSD on x86. |
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Stdcall convention. |
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-malign-double, -mregparm=, -malign-loops= and -malign-jumps= switches. |
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On ISC systems, support -Xp like -posix. |
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Additions for RS/6000: |
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Instruction scheduling information for PowerPC 403. |
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AIX 4.1 on PowerPC. |
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-mstring and -mno-string. |
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-msoft-float and floating-point emulation included. |
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Preliminary support for PowerPC System V.4 with or without the GNU as. |
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Preliminary support for EABI. |
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Preliminary support for 64-bit systems. |
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Both big and little endian systems. |
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New features for MIPS-based systems: |
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r4650. |
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mips4 and R8000. |
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Irix 6.0. |
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64-bit ABI. |
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Allow dollar signs in labels on SGI/Irix 5.x. |
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New support for HP PA RISC: |
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Generation of PIC (requires binutils-2.5.2.u6 or later). |
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HP-UX version 9 on HP PA RISC (dynamically links even with -g). |
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Processor variants for HP PA RISC: 700, 7100, and 7100LC. |
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Automatic generation of long calls when needed. |
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-mfast-indirect-calls for kernels and static binaries. |
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The called routine now copies arguments passed by invisible reference, |
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as required by the calling standard. |
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Other new miscellaneous target-specific support: |
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-mno-multm on a29k. |
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-mold-align for i960. |
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Configuration for "semi-hosted" ARM. |
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-momit-leaf-frame-pointer for M88k. |
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SH3 variant of Hitachi Super-H and support both big and little endian. |
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Changes to Objective-C: |
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Bare-bones implementation of NXConstantString has been added, |
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which is invoked by the @"string" directive. |
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Class * has been changed to Class to conform to the NextSTEP and |
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OpenStep runtime. |
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Enhancements to make dynamic loading easier. |
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The module version number has been updated to Version 7, thus existing |
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code will need to be recompiled to use the current run-time library. |
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GCC now supports the ISO Normative Addendum 1 to the C Standard. |
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As a result: |
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The header <iso646.h> defines macros for C programs written |
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in national variants of ISO 646. |
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The following digraph tokens are supported: |
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<: :> <% %> %: %:%: |
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These behave like the following, respectively: |
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[ ] { } # ## |
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Digraph tokens are supported unless you specify the `-traditional' |
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option; you do not need to specify `-ansi' or `-trigraphs'. Except |
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for contrived and unlikely examples involving preprocessor |
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stringizing, digraph interpretation doesn't change the meaning of |
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programs; this is unlike trigraph interpretation, which changes the |
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meanings of relatively common strings. |
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The macro __STDC_VERSION__ has the value 199409L. |
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As usual, for full conformance to the standard, you also need a |
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C library that conforms. |
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The following lists changes that have been made to g++. If some |
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features mentioned below sound unfamiliar, you will probably want to |
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look at the recently-released public review copy of the C++ Working |
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Paper. For PostScript and PDF (Adobe Acrobat) versions, see the |
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archive at ftp://research.att.com/dist/stdc++/WP. For HTML and ASCII |
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versions, see ftp://ftp.cygnus.com/pub/g++. On the web, see |
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http://www.cygnus.com/~mrs/wp-draft. |
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The scope of variables declared in the for-init-statement has been changed |
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to conform to http://www.cygnus.com/~mrs/wp-draft/stmt.html#stmt.for; as a |
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result, packages such as groff 1.09 will not compile unless you specify the |
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-fno-for-scope flag. PLEASE DO NOT REPORT THIS AS A BUG; this is a change |
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mandated by the C++ standardization committee. |
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Binary incompatibilities: |
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The builtin 'bool' type is now the size of a machine word on RISC targets, |
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for code efficiency; it remains one byte long on CISC targets. |
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Code that does not use #pragma interface/implementation will most |
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likely shrink dramatically, as g++ now only emits the vtable for a |
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class in the translation unit where its first non-inline, non-abstract |
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virtual function is defined. |
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Classes that do not define the copy constructor will sometimes be |
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passed and returned in registers. This may illuminate latent bugs in |
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your code. |
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Support for automatic template instantiation has *NOT* been added, due |
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to a disagreement over design philosophies. |
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Support for exception handling has been improved; more targets are now |
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supported, and throws will use the RTTI mechanism to match against the |
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catch parameter type. Optimization is NOT SUPPORTED with |
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-fhandle-exceptions; no need to report this as a bug. |
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Support for Run-Time Type Identification has been added with -frtti. |
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This support is still in alpha; one major restriction is that any file |
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compiled with -frtti must include <typeinfo.h>. |
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Preliminary support for namespaces has been added. This support is far |
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from complete, and probably not useful. |
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Synthesis of compiler-generated constructors, destructors and |
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assignment operators is now deferred until the functions are used. |
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The parsing of expressions such as `a ? b : c = 1' has changed from |
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`(a ? b : c) = 1' to `a : b ? (c = 1)'. |
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The code generated for testing conditions, especially those using || |
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and &&, is now more efficient. |
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The operator keywords and, and_eq, bitand, bitor, compl, not, not_eq, |
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or, or_eq, xor and xor_eq are now supported. Use -ansi or |
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-foperator-names to enable them. |
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The 'explicit' keyword is now supported. 'explicit' is used to mark |
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constructors and type conversion operators that should not be used |
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implicitly. |
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g++ now accepts the typename keyword, though it currently has no |
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semantics; it can be a no-op in the current template implementation. |
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You may want to start using it in your code, however, since the |
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pending rewrite of the template implementation to compile STL properly |
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(perhaps for 2.8.0, perhaps not) will require you to use it as |
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indicated by the current draft. |
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Handling of user-defined type conversion has been overhauled so that |
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type conversion operators are now found and used properly in |
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expressions and function calls. |
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-fno-strict-prototype now only applies to function declarations with |
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"C" linkage. |
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g++ now warns about 'if (x=0)' with -Wparentheses or -Wall. |
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#pragma weak and #pragma pack are supported on System V R4 targets, as |
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are various other target-specific #pragmas supported by gcc. |
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new and delete of const types is now allowed (with no additional |
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semantics). |
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Explicit instantiation of template methods is now supported. Also, |
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'inline template class foo<int>;' can be used to emit only the vtable |
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for a template class. |
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With -fcheck-new, g++ will check the return value of all calls to |
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operator new, and not attempt to modify a returned null pointer. |
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The template instantiation code now handles more conversions when |
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passing to a parameter that does not depend on template arguments. |
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This means that code like 'string s; cout << s;' now works. |
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Invalid jumps in a switch statement past declarations that require |
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initializations are now caught. |
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Functions declared 'extern inline' now have the same linkage semantics |
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as inline member functions. On supported targets, where previously |
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these functions (and vtables, and template instantiations) would have |
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been defined statically, they will now be defined as weak symbols so |
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that only one out-of-line definition is used. |
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collect2 now demangles linker output, and c++filt has become part of |
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the gcc distribution. |
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Noteworthy changes in GCC version 2.6.3: |
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A few more bugs have been fixed. |
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Noteworthy changes in GCC version 2.6.2: |
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A few bugs have been fixed. |
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Names of attributes can now be preceded and followed by double underscores. |
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Noteworthy changes in GCC version 2.6.1: |
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Numerous (mostly minor) bugs have been fixed. |
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The following new configurations are supported: |
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GNU on x86 (instead of treating it like MACH) |
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NetBSD on Sparc and Motorola 68k |
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AIX 4.1 on RS/6000 and PowerPC systems |
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Sequent DYNUX/ptx 1.x and 2.x. |
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Both COFF and ELF configurations on AViiON without using /bin/gcc |
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Windows/NT on x86 architecture; preliminary |
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AT&T DSP1610 digital signal processor chips |
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i960 systems on bare boards using COFF |
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PDP11; target only and not extensively tested |
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The -pg option is now supported for Alpha under OSF/1 V3.0 or later. |
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Files with an extension of ".c++" are treated as C++ code. |
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The -Xlinker and -Wl arguments are now passed to the linker in the |
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position they were specified on the command line. This makes it |
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possible, for example, to pass flags to the linker about specific |
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object files. |
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The use of positional arguments to the configure script is no longer |
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recommended. Use --target= to specify the target; see the GCC manual. |
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The 386 now supports two new switches: -mreg-alloc=<string> changes |
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the default register allocation order used by the compiler, and |
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-mno-wide-multiply disables the use of the mul/imul instructions that |
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produce 64 bit results in EAX:EDX from 32 bit operands to do long long |
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multiplies and 32-bit division by constants. |
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Noteworthy changes in GCC version 2.6.0: |
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Numerous bugs have been fixed, in the C and C++ front-ends, as |
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well as in the common compiler code. |
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This release includes the C, Objective-C, and C++ compilers. However, |
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we have moved the files for the C++ compiler (G++) files to a |
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subdirectory, cp. Subsequent releases of GCC will split these files |
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to a separate TAR file. |
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The G++ team has been tracking the development of the ANSI standard for C++. |
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Here are some new features added from the latest working paper: |
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* built-in boolean type 'bool', with constants 'true' and 'false'. |
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* array new and delete (operator new [] and delete []). |
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* WP-conforming lifetime of temporaries. |
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* explicit instantiation of templates (template class A<int>;), |
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along with an option (-fno-implicit-templates) to disable emission |
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of implicitly instantiated templates, obsoletes -fexternal-templates. |
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* static member constants (static const int foo = 4; within the |
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class declaration). |
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Many error messages have been improved to tell the user more about the |
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problem. Conformance checking with -pedantic-errors has been |
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improved. G++ now compiles Fresco. |
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|
|
There is now an experimental implementation of virtual functions using |
|
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|
|
thunks instead of Cfront-style vtables, enabled with -fvtable-thunks. |
|
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|
|
This option also enables a heuristic which causes the compiler to only |
|
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|
|
emit the vtable in the translation unit where its first non-inline |
|
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|
|
virtual function is defined; using this option and |
|
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|
|
-fno-implicit-templates, users should be able to avoid #pragma |
|
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|
|
interface/implementation altogether. |
|
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|
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|
|
Signatures have been added as a GNU C++ extension. Using the option |
|
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|
|
-fhandle-signatures, users are able to turn on recognition of |
|
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|
|
signatures. A short introduction on signatures is in the section |
|
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|
|
`Extension to the C++ Language' in the manual. |
|
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|
|
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|
|
The `g++' program is now a C program, rather than a shell script. |
|
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|
|
|
|
|
|
Lots and lots and lots of bugs fixes, in nested types, access control, |
|
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|
|
pointers to member functions, the parser, templates, overload |
|
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|
|
resolution, etc, etc. |
|
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|
|
|
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|
|
|
There have been two major enhancements to the Objective-C compiler: |
|
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|
|
1) Added portability. It now runs on Alpha, and some problems with |
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|
|
message forwarding have been addressed on other platforms. |
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|
|
2) Selectors have been redefined to be pointers to structs like: |
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|
|
{ void *sel_id, char *sel_types }, where the sel_id is the unique |
|
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|
|
identifier, the selector itself is no longer unique. |
|
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|
|
Programmers should use the new function sel_eq to test selector |
|
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|
|
equivalence. |
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|
|
The following major changes have been made to the base compiler and |
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|
|
machine-specific files. |
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|
|
- The MIL-STD-1750A is a new port, but still preliminary. |
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|
- The h8/300h is now supported; both the h8/300 and h8/300h ports come |
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|
|
with 32 bit IEEE 754 software floating point support. |
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|
- The 64-bit Sparc (v9) and 64-bit MIPS chips are supported. |
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|
- NetBSD is supported on m68k, Intel x86, and pc523 systems and FreeBSD |
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|
on x86. |
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|
- COFF is supported on x86, m68k, and Sparc systems running LynxOS. |
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|
- 68K systems from Bull and Concurrent are supported and System V |
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|
Release 4 is supported on the Atari. |
|
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|
|
- GCC supports GAS on the Motorola 3300 (sysV68) and debugging |
|
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|
|
(assuming GAS) on the Plexus 68K system. (However, GAS does not yet |
|
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|
|
work on those systems). |
|
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|
|
- System V Release 4 is supported on MIPS (Tandem). |
|
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|
|
- For DG/UX, an ELF configuration is now supported, and both the ELF |
|
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|
|
and BCS configurations support ELF and COFF object file formats. |
|
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|
|
- OSF/1 V2.0 is supported on Alpha. |
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|
|
- Function profiling is also supported on Alpha. |
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|
|
- GAS and GDB is supported for Irix 5 (MIPS). |
|
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|
- "common mode" (code that will run on both POWER and PowerPC |
|
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|
|
architectures) is now supported for the RS/6000 family; the |
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|
|
compiler knows about more PPC chips. |
|
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|
|
- Both NeXTStep 2.1 and 3 are supported on 68k-based architectures. |
|
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|
|
- On the AMD 29k, the -msoft-float is now supported, as well as |
|
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|
|
-mno-sum-in-toc for RS/6000, -mapp-regs and -mflat for Sparc, and |
|
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|
|
-membedded-pic for MIPS. |
|
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|
|
|
|
- GCC can now convert division by integer constants into the equivalent |
|
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|
|
multiplication and shift operations when that is faster than the |
|
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|
|
division. |
|
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|
|
- Two new warning options, -Wbad-function-cast and |
|
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|
|
-Wmissing-declarations have been added. |
|
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|
|
- Configurations may now add machine-specific __attribute__ options on |
|
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|
|
type; many machines support the `section' attribute. |
|
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|
|
- The -ffast-math flag permits some optimization that violate strict |
|
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|
|
IEEE rules, such as converting X * 0.0 to 0.0. |
|
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|
|
|
Noteworthy changes in GCC version 2.5.8: |
|
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|
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|
|
This release only fixes a few serious bugs. These include fixes for a |
|
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|
|
bug that prevented most programs from working on the RS/6000, a bug |
|
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|
|
that caused invalid assembler code for programs with a `switch' |
|
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|
|
statement on the NS32K, a G++ problem that caused undefined names in |
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|
|
some configurations, and several less serious problems, some of which |
|
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|
|
can affect most configuration. |
|
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|
|
|
|
|
|
Noteworthy change in GCC version 2.5.7: |
|
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|
|
|
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|
|
This release only fixes a few bugs, one of which was causing bootstrap |
|
|
|
|
compare errors on some systems. |
|
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|
|
|
|
|
|
|
Noteworthy change in GCC version 2.5.6: |
|
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|
|
|
|
|
|
A few backend bugs have been fixed, some of which only occur on one |
|
|
|
|
machine. |
|
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|
|
|
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|
|
The C++ compiler in 2.5.6 includes: |
|
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|
|
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|
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|
|
* fixes for some common crashes |
|
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|
|
* correct handling of nested types that are referenced as `foo::bar' |
|
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|
|
* spurious warnings about friends being declared static and never |
|
|
|
|
defined should no longer appear |
|
|
|
|
* enums that are local to a method in a class, or a class that's |
|
|
|
|
local to a function, are now handled correctly. For example: |
|
|
|
|
class foo { void bar () { enum { x, y } E; x; } }; |
|
|
|
|
void bar () { class foo { enum { x, y } E; E baz; }; } |
|
|
|
|
|
|
|
|
|
Noteworthy change in GCC version 2.5.5: |
|
|
|
|
|
|
|
|
|
A large number of C++ bugs have been fixed. |
|
|
|
|
|
|
|
|
|
The fixproto script adds prototypes conditionally on __cplusplus. |
|
|
|
|
|
|
|
|
|
Noteworthy change in GCC version 2.5.4: |
|
|
|
|
|
|
|
|
|
A bug fix in passing of structure arguments for the HP-PA architecture |
|
|
|
|
makes code compiled with GCC 2.5.4 incompatible with code compiled |
|
|
|
|
with earlier versions (if it passes struct arguments of 33 to 64 bits, |
|
|
|
|
interspersed with other types of arguments). |
|
|
|
|
|
|
|
|
|
Noteworthy change in gcc version 2.5.3: |
|
|
|
|
|
|
|
|
|
The method of "mangling" C++ function names has been changed. So you |
|
|
|
|
must recompile all C++ programs completely when you start using GCC |
|
|
|
|
2.5. Also, GCC 2.5 requires libg++ version 2.5. Earlier libg++ |
|
|
|
|
versions won't work with GCC 2.5. (This is generally true--GCC |
|
|
|
|
version M.N requires libg++ version M.N.) |
|
|
|
|
|
|
|
|
|
Noteworthy GCC changes in version 2.5: |
|
|
|
|
|
|
|
|
|
* There is now support for the IBM 370 architecture as a target. |
|
|
|
|
Currently the only operating system supported is MVS; GCC does not run |
|
|
|
|
on MVS, so you must produce .s files using GCC as a cross compiler, |
|
|
|
|
then transfer them to MVS to assemble them. This port is not reliable |
|
|
|
|
yet. |
|
|
|
|
|
|
|
|
|
* The Power PC is now supported. |
|
|
|
|
|
|
|
|
|
* The i860-based Paragon machine is now supported. |
|
|
|
|
|
|
|
|
|
* The Hitachi 3050 (an HP-PA machine) is now supported. |
|
|
|
|
|
|
|
|
|
* The variable __GNUC_MINOR__ holds the minor version number of GCC, as |
|
|
|
|
an integer. For version 2.5.X, the value is 5. |
|
|
|
|
|
|
|
|
|
* In C, initializers for static and global variables are now processed |
|
|
|
|
an element at a time, so that they don't need a lot of storage. |
|
|
|
|
|
|
|
|
|
* The C syntax for specifying which structure field comes next in an |
|
|
|
|
initializer is now `.FIELDNAME='. The corresponding syntax for |
|
|
|
|
array initializers is now `[INDEX]='. For example, |
|
|
|
|
|
|
|
|
|
char whitespace[256] |
|
|
|
|
= { [' '] = 1, ['\t'] = 1, ['\n'] = 1 }; |
|
|
|
|
|
|
|
|
|
This was changed to accord with the syntax proposed by the Numerical |
|
|
|
|
C Extensions Group (NCEG). |
|
|
|
|
|
|
|
|
|
* Complex numbers are now supported in C. Use the keyword __complex__ |
|
|
|
|
to declare complex data types. See the manual for details. |
|
|
|
|
|
|
|
|
|
* GCC now supports `long double' meaningfully on the Sparc (128-bit |
|
|
|
|
floating point) and on the 386 (96-bit floating point). The Sparc |
|
|
|
|
support is enabled on on Solaris 2.x because earlier system versions |
|
|
|
|
(SunOS 4) have bugs in the emulation. |
|
|
|
|
|
|
|
|
|
* All targets now have assertions for cpu, machine and system. So you |
|
|
|
|
can now use assertions to distinguish among all supported targets. |
|
|
|
|
|
|
|
|
|
* Nested functions in C may now be inline. Just declare them inline |
|
|
|
|
in the usual way. |
|
|
|
|
|
|
|
|
|
* Packed structure members are now supported fully; it should be possible |
|
|
|
|
to access them on any supported target, no matter how little alignment |
|
|
|
|
they have. |
|
|
|
|
|
|
|
|
|
* To declare that a function does not return, you must now write |
|
|
|
|
something like this (works only in 2.5): |
|
|
|
|
|
|
|
|
|
void fatal () __attribute__ ((noreturn)); |
|
|
|
|
|
|
|
|
|
or like this (works in older versions too): |
|
|
|
|
|
|
|
|
|
typedef void voidfn (); |
|
|
|
|
|
|
|
|
|
volatile voidfn fatal; |
|
|
|
|
|
|
|
|
|
It used to be possible to do so by writing this: |
|
|
|
|
|
|
|
|
|
volatile void fatal (); |
|
|
|
|
|
|
|
|
|
but it turns out that ANSI C requires that to mean something |
|
|
|
|
else (which is useless). |
|
|
|
|
|
|
|
|
|
Likewise, to declare that a function is side-effect-free |
|
|
|
|
so that calls may be deleted or combined, write |
|
|
|
|
something like this (works only in 2.5): |
|
|
|
|
|
|
|
|
|
int computation () __attribute__ ((const)); |
|
|
|
|
|
|
|
|
|
or like this (works in older versions too): |
|
|
|
|
|
|
|
|
|
typedef int intfn (); |
|
|
|
|
|
|
|
|
|
const intfn computation; |
|
|
|
|
|
|
|
|
|
* The new option -iwithprefixbefore specifies a directory to add to |
|
|
|
|
the search path for include files in the same position where -I would |
|
|
|
|
put it, but uses the specified prefix just like -iwithprefix. |
|
|
|
|
|
|
|
|
|
* Basic block profiling has been enhanced to record the function the |
|
|
|
|
basic block comes from, and if the module was compiled for debugging, |
|
|
|
|
the line number and filename. A default version of the basic block |
|
|
|
|
support module has been added to libgcc2 that appends the basic block |
|
|
|
|
information to a text file 'bb.out'. Machine descriptions can now |
|
|
|
|
override the basic block support module in the target macro file. |
|
|
|
|
|
|
|
|
|
New features in g++: |
|
|
|
|
|
|
|
|
|
* The new flag `-fansi-overloading' for C++. Use a newly implemented |
|
|
|
|
scheme of argument matching for C++. It makes g++ more accurately |
|
|
|
|
obey the rules set down in Chapter 13 of the Annotated C++ Reference |
|
|
|
|
Manual (the ARM). This option will be turned on by default in a |
|
|
|
|
future release. |
|
|
|
|
|
|
|
|
|
* The -finline-debug flag is now gone (it was never really used by the |
|
|
|
|
compiler). |
|
|
|
|
|
|
|
|
|
* Recognizing the syntax for pointers to members, e.g., "foo::*bar", has been |
|
|
|
|
dramatically improved. You should not get any syntax errors or incorrect |
|
|
|
|
runtime results while using pointers to members correctly; if you do, it's |
|
|
|
|
a definite bug. |
|
|
|
|
|
|
|
|
|
* Forward declaration of an enum is now flagged as an error. |
|
|
|
|
|
|
|
|
|
* Class-local typedefs are now working properly. |
|
|
|
|
|
|
|
|
|
* Nested class support has been significantly improved. The compiler |
|
|
|
|
will now (in theory) support up to 240 nested classes before hitting |
|
|
|
|
other system limits (like memory size). |
|
|
|
|
|
|
|
|
|
* There is a new C version of the `g++' driver, to replace the old |
|
|
|
|
shell script. This should significantly improve the performance of |
|
|
|
|
executing g++ on a system where a user's PATH environment variable |
|
|
|
|
references many NFS-mounted filesystems. This driver also works |
|
|
|
|
under MS-DOS and OS/2. |
|
|
|
|
|
|
|
|
|
* The ANSI committee working on the C++ standard has adopted a new |
|
|
|
|
keyword `mutable'. This will allow you to make a specific member be |
|
|
|
|
modifiable in an otherwise const class. |
|
|
|
|
|
|
|
|
|
Noteworthy GCC changes in version 2.4.4: |
|
|
|
|
|
|
|
|
|
A crash building g++ on various hosts (including m68k) has been |
|
|
|
|
fixed. Also the g++ compiler no longer reports incorrect |
|
|
|
|
ambiguities in some situations where they do not exist, and |
|
|
|
|
const template member functions are now being found properly. |
|
|
|
|
|
|
|
|
|
Noteworthy GCC changes in version 2.4: |
|
|
|
|
|
|
|
|
|
* On each target, the default is now to return short structures |
|
|
|
|
compatibly with the "usual" compiler on that target. |
|
|
|
|
|
|
|
|
|
For most targets, this means the default is to return all structures |
|
|
|
|
in memory, like long structures, in whatever way is used on that |
|
|
|
|
target. Use -freg-struct-return to enable returning short structures |
|
|
|
|
(and unions) in registers. |
|
|
|
|
|
|
|
|
|
This change means that newly compiled binaries are incompatible with |
|
|
|
|
binaries compiled with previous versions of GCC. |
|
|
|
|
|
|
|
|
|
On some targets, GCC is itself the usual compiler. On these targets, |
|
|
|
|
the default way to return short structures is still in registers. |
|
|
|
|
Use -fpcc-struct-return to tell GCC to return them in memory. |
|
|
|
|
|
|
|
|
|
* There is now a floating point emulator which can imitate the way all |
|
|
|
|
supported target machines do floating point arithmetic. |
|
|
|
|
|
|
|
|
|
This makes it possible to have cross compilation to and from the VAX, |
|
|
|
|
and between machines of different endianness. However, this works |
|
|
|
|
only when the target machine description is updated to use the new |
|
|
|
|
facilities, and not all have been updated. |
|
|
|
|
|
|
|
|
|
This also makes possible support for longer floating point types. |
|
|
|
|
GCC 2.4 supports extended format on the 68K if you use `long double', |
|
|
|
|
for targets that have a 68881. (When we have run time library |
|
|
|
|
routines for extended floating point, then `long double' will use |
|
|
|
|
extended format on all 68K targets.) |
|
|
|
|
|
|
|
|
|
We expect to support extended floating point on the i386 and Sparc in |
|
|
|
|
future versions. |
|
|
|
|
|
|
|
|
|
* Building GCC now automatically fixes the system's header files. |
|
|
|
|
This should require no attention. |
|
|
|
|
|
|
|
|
|
* GCC now installs an unsigned data type as size_t when it fixes the |
|
|
|
|
header files (on all but a handful of old target machines). |
|
|
|
|
Therefore, the bug that size_t failed to be unsigned is fixed. |
|
|
|
|
|
|
|
|
|
* Building and installation are now completely separate. |
|
|
|
|
All new files are constructed during the build process; |
|
|
|
|
installation just copies them. |
|
|
|
|
|
|
|
|
|
* New targets supported: Clipper, Hitachi SH, Hitachi 8300, and Sparc |
|
|
|
|
Lite. |
|
|
|
|
|
|
|
|
|
* A totally new and much better Objective C run time system is included. |
|
|
|
|
|
|
|
|
|
* Objective C supports many new features. Alas, I can't describe them |
|
|
|
|
since I don't use that language; however, they are the same ones |
|
|
|
|
supported in recent versions of the NeXT operating system. |
|
|
|
|
|
|
|
|
|
* The builtin functions __builtin_apply_args, __builtin_apply and |
|
|
|
|
__builtin_return let you record the arguments and returned |
|
|
|
|
value of a function without knowing their number or type. |
|
|
|
|
|
|
|
|
|
* The builtin string variables __FUNCTION__ and __PRETTY_FUNCTION__ |
|
|
|
|
give the name of the function in the source, and a pretty-printed |
|
|
|
|
version of the name. The two are the same in C, but differ in C++. |
|
|
|
|
|
|
|
|
|
* Casts to union types do not yield lvalues. |
|
|
|
|
|
|
|
|
|
* ## before an empty rest argument discards the preceding sequence |
|
|
|
|
of non-whitespace characters from the macro definition. |
|
|
|
|
(This feature is subject to change.) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
New features specific to C++: |
|
|
|
|
|
|
|
|
|
* The manual contains a new section ``Common Misunderstandings with |
|
|
|
|
GNU C++'' that C++ users should read. |
|
|
|
|
|
|
|
|
|
* #pragma interface and #pragma implementation let you use the same |
|
|
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C++ source file for both interface and implementation. |
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However, this mechanism is still in transition. |
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* Named returned values let you avoid an extra constructor call |
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when a function result has a class type. |
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* The C++ operators <? and >? yield min and max, respectively. |
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* C++ gotos can exit a block safely even if the block has |
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aggregates that require destructors. |
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* gcc defines the macro __GNUG__ when compiling C++ programs. |
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* GNU C++ now correctly distinguishes between the prefix and postfix |
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forms of overloaded operator ++ and --. To avoid breaking old |
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code, if a class defines only the prefix form, the compiler |
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accepts either ++obj or obj++, unless -pedantic is used. |
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* If you are using version 2.3 of libg++, you need to rebuild it with |
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`make CC=gcc' to avoid mismatches in the definition of `size_t'. |
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Newly documented compiler options: |
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-fnostartfiles |
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Omit the standard system startup files when linking. |
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-fvolatile-global |
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Consider memory references to extern and global data items to |
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be volatile. |
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-idirafter DIR |
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Add DIR to the second include path. |
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-iprefix PREFIX |
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Specify PREFIX for later -iwithprefix options. |
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-iwithprefix DIR |
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Add PREFIX/DIR to the second include path. |
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-mv8 |
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Emit Sparc v8 code (with integer multiply and divide). |
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-msparclite |
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Emit Sparclite code (roughly v7.5). |
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-print-libgcc-file-name |
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Search for the libgcc.a file, print its absolute file name, and exit. |
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-Woverloaded-virtual |
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Warn when a derived class function declaration may be an error |
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in defining a C++ virtual function. |
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-Wtemplate-debugging |
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When using templates in a C++ program, warn if debugging is |
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not yet fully available. |
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+eN |
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Control how C++ virtual function definitions are used |
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(like cfront 1.x). |
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