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[build] Inhibit .eh_frame on newer gcc versions 

Using -fno-dwarf2-cfi-asm is not sufficient to prevent the .eh_frame
section from being generated on newer versions of gcc.  Add
-fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables;
this is sufficient to inhibit the .eh_frame section on gcc 4.7.1.

This does not affect the overall binary size, but does fix the numbers
reported by "size" for individual object files.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/598/head
Michael Brown 2012-11-02 12:15:36 +00:00
parent f008698c68
commit 0932bc5156
1 changed files with 5 additions and 2 deletions
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7
src/Makefile.housekeeping
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@ -162,9 +162,12 @@ endif
# output of "size". Inhibit this.
#
ifeq ($(CCTYPE),gcc)
CFI_TEST = $(CC) -fno-dwarf2-cfi-asm -x c -c /dev/null \
CFI_TEST = $(CC) -fno-dwarf2-cfi-asm -fno-exceptions -fno-unwind-tables \
-fno-asynchronous-unwind-tables -x c -c /dev/null \
-o /dev/null >/dev/null 2>&1
CFI_FLAGS := $(shell $(CFI_TEST) && $(ECHO) '-fno-dwarf2-cfi-asm')
CFI_FLAGS := $(shell $(CFI_TEST) && \
$(ECHO) '-fno-dwarf2-cfi-asm -fno-exceptions ' \
'-fno-unwind-tables -fno-asynchronous-unwind-tables')
WORKAROUND_CFLAGS += $(CFI_FLAGS)
endif