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build: use -m16 where available instead of asm(".code16gcc") 

GCC 4.9 and clang 3.5 support the -m16 option on the command line which
supersedes the hackish ".code16gcc" assembler directive. Use it where
possible.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2014-06-03 17:28:22 +01:00 committed by Kevin O'Connor
parent ec44fac1f6
commit 04b531ab15
1 changed files with 3 additions and 1 deletions
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4
Makefile
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@ -61,13 +61,15 @@ COMMONCFLAGS := -I$(OUT) -Isrc -Os -MD -g \
COMMONCFLAGS += $(call cc-option,$(CC),-nopie,)
COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,)
COMMA := ,
CFLAGS32FLAT := $(COMMONCFLAGS) -DMODE16=0 -DMODESEGMENT=0 -fomit-frame-pointer
CFLAGSSEG := $(COMMONCFLAGS) -DMODESEGMENT=1 -fno-defer-pop \
$(call cc-option,$(CC),-fno-jump-tables,-DMANUAL_NO_JUMP_TABLE) \
$(call cc-option,$(CC),-fno-tree-switch-conversion,)
CFLAGS32SEG := $(CFLAGSSEG) -DMODE16=0 -fomit-frame-pointer
CFLAGS16INC := $(CFLAGSSEG) -DMODE16=1 -Wa,src/code16gcc.s \
CFLAGS16INC := $(CFLAGSSEG) -DMODE16=1 \
$(call cc-option,$(CC),-m16,-Wa$(COMMA)src/code16gcc.s) \
$(call cc-option,$(CC),--param large-stack-frame=4,-fno-inline)
CFLAGS16 := $(CFLAGS16INC) -fomit-frame-pointer