Assume that we have signed integral types and flexible array members.
These compiler features are required by C99, so remove the configure probes for them. This is part of a series of commits to get rid of no-longer-relevant configure checks and dead src/port/ code. I'm committing them separately to make it easier to back out individual changes if they prove less portable than I expect. Discussion: https://postgr.es/m/15379.1582221614@sss.pgh.pa.us
This commit is contained in:
Tom Lane
parent
97cf1fa4ed
commit
f4d59369d2
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@ -2,21 +2,6 @@
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# config/c-compiler.m4
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# PGAC_C_SIGNED
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# -------------
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# Check if the C compiler understands signed types.
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AC_DEFUN([PGAC_C_SIGNED],
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[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
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[signed char c; signed short s; signed int i;])],
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[pgac_cv_c_signed=yes],
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[pgac_cv_c_signed=no])])
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if test x"$pgac_cv_c_signed" = xno ; then
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AC_DEFINE(signed,, [Define to empty if the C compiler does not understand signed types.])
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fi])# PGAC_C_SIGNED
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# PGAC_C_PRINTF_ARCHETYPE
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# -----------------------
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# Select the format archetype to be used by gcc to check printf-type functions.
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@ -13694,78 +13694,6 @@ cat >>confdefs.h <<_ACEOF
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_ACEOF
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for flexible array members" >&5
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$as_echo_n "checking for flexible array members... " >&6; }
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if ${ac_cv_c_flexmember+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <stddef.h>
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struct s { int n; double d[]; };
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int
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main ()
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{
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int m = getchar ();
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struct s *p = malloc (offsetof (struct s, d)
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+ m * sizeof (double));
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p->d[0] = 0.0;
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return p->d != (double *) NULL;
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_c_flexmember=yes
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else
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ac_cv_c_flexmember=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_flexmember" >&5
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$as_echo "$ac_cv_c_flexmember" >&6; }
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if test $ac_cv_c_flexmember = yes; then
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$as_echo "#define FLEXIBLE_ARRAY_MEMBER /**/" >>confdefs.h
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else
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$as_echo "#define FLEXIBLE_ARRAY_MEMBER 1" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for signed types" >&5
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$as_echo_n "checking for signed types... " >&6; }
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if ${pgac_cv_c_signed+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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signed char c; signed short s; signed int i;
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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pgac_cv_c_signed=yes
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else
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pgac_cv_c_signed=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_c_signed" >&5
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$as_echo "$pgac_cv_c_signed" >&6; }
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if test x"$pgac_cv_c_signed" = xno ; then
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$as_echo "#define signed /**/" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __func__" >&5
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$as_echo_n "checking for __func__... " >&6; }
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if ${pgac_cv_funcname_func_support+:} false; then :
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@ -1458,8 +1458,6 @@ m4_defun([AC_PROG_CC_STDC], []) dnl We don't want that.
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AC_C_BIGENDIAN
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AC_C_INLINE
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PGAC_PRINTF_ARCHETYPE
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AC_C_FLEXIBLE_ARRAY_MEMBER
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PGAC_C_SIGNED
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PGAC_C_FUNCNAME_SUPPORT
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PGAC_C_STATIC_ASSERT
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PGAC_C_TYPEOF
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@ -265,6 +265,16 @@
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#define dummyret char
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#endif
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/*
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* We require C99, hence the compiler should understand flexible array
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* members. However, for documentation purposes we still consider it to be
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* project style to write "field[FLEXIBLE_ARRAY_MEMBER]" not just "field[]".
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* When computing the size of such an object, use "offsetof(struct s, f)"
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* for portability. Don't use "offsetof(struct s, f[0])", as this doesn't
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* work with MSVC and with C++ compilers.
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*/
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#define FLEXIBLE_ARRAY_MEMBER /* empty */
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/* Which __func__ symbol do we have, if any? */
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#ifdef HAVE_FUNCNAME__FUNC
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#define PG_FUNCNAME_MACRO __func__
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@ -64,15 +64,6 @@
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(--enable-thread-safety) */
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#undef ENABLE_THREAD_SAFETY
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/* Define to nothing if C supports flexible array members, and to 1 if it does
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not. That way, with a declaration like `struct s { int n; double
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d[FLEXIBLE_ARRAY_MEMBER]; };', the struct hack can be used with pre-C99
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compilers. When computing the size of such an object, don't use 'sizeof
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(struct s)' as it overestimates the size. Use 'offsetof (struct s, d)'
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instead. Don't use 'offsetof (struct s, d[0])', as this doesn't work with
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MSVC and with C++ compilers. */
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#undef FLEXIBLE_ARRAY_MEMBER
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/* Define to 1 if gettimeofday() takes only 1 argument. */
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#undef GETTIMEOFDAY_1ARG
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@ -976,8 +967,5 @@
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# define __restrict__
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#endif
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/* Define to empty if the C compiler does not understand signed types. */
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#undef signed
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/* Define to how the compiler spells `typeof'. */
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#undef typeof
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@ -201,7 +201,6 @@ sub GenerateFiles
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ENABLE_GSS => $self->{options}->{gss} ? 1 : undef,
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ENABLE_NLS => $self->{options}->{nls} ? 1 : undef,
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ENABLE_THREAD_SAFETY => 1,
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FLEXIBLE_ARRAY_MEMBER => '/**/',
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GETTIMEOFDAY_1ARG => undef,
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HAVE_APPEND_HISTORY => undef,
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HAVE_ASN1_STRING_GET0_DATA => undef,
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@ -483,7 +482,6 @@ sub GenerateFiles
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pg_restrict => '__restrict',
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# not defined, because it'd conflict with __declspec(restrict)
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restrict => undef,
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signed => undef,
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typeof => undef,);
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if ($self->{options}->{uuid})
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