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[build] Avoid using -ffunction-sections on some older versions of gcc 

Some older versions of gcc issue a warning if -ffunction-sections is
used in combination with -g (gcc bug #18553).  Inhibit
-ffunction-sections when building with such a version of gcc.

Reported-by: zhengwei <zw111_2001@126.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/5/head
Michael Brown 2011-06-29 11:42:07 +01:00
parent 00afad8122
commit 95d82bb2a2
1 changed files with 8 additions and 2 deletions
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10
src/Makefile.housekeeping
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@ -450,14 +450,20 @@ endif
# Enable per-item sections and section garbage collection. Note that # Enable per-item sections and section garbage collection. Note that
# some older versions of gcc support -fdata-sections but treat it as # some older versions of gcc support -fdata-sections but treat it as
# implying -fno-common, which would break our build. # implying -fno-common, which would break our build. Some other older
# versions issue a spurious and uninhibitable warning if
# -ffunction-sections is used with -g, which would also break our
# build since we use -Werror.
# #
ifeq ($(CCTYPE),gcc) ifeq ($(CCTYPE),gcc)
DS_TEST = $(ECHO) 'char x;' | \ DS_TEST = $(ECHO) 'char x;' | \
$(CC) -fdata-sections -S -x c - -o - 2>/dev/null | \ $(CC) -fdata-sections -S -x c - -o - 2>/dev/null | \
grep -E '\.comm' > /dev/null grep -E '\.comm' > /dev/null
DS_FLAGS := $(shell $(DS_TEST) && $(ECHO) '-fdata-sections') DS_FLAGS := $(shell $(DS_TEST) && $(ECHO) '-fdata-sections')
CFLAGS += -ffunction-sections $(DS_FLAGS) FS_TEST = $(CC) -ffunction-sections -g -c -x c /dev/null \
-o /dev/null 2>/dev/null
FS_FLAGS := $(shell $(FS_TEST) && $(ECHO) '-ffunction-sections')
CFLAGS += $(FS_FLAGS) $(DS_FLAGS)
endif endif
LDFLAGS += --gc-sections LDFLAGS += --gc-sections