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[makefile] Fix -fno-stack-protector test on older versions of gcc 

Some older versions of gcc don't complain about unknown compiler flags
unless you ask them to actually compile; asking them to merely
preprocess won't trigger the error.

Fix the -fno-stack-protector test by making it attempt to compile an
empty file, rather than preprocess an empty file.
pull/1/head
Michael Brown 2008-10-01 19:05:39 +01:00
parent afe1323c76
commit 91802c6e85
1 changed files with 2 additions and 1 deletions
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src/Makefile.housekeeping
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@ -112,7 +112,8 @@ oldgas :
# default, even when -ffreestanding is specified. We therefore need # default, even when -ffreestanding is specified. We therefore need
# to disable -fstack-protector if the compiler supports it. # to disable -fstack-protector if the compiler supports it.
# #
SP_TEST = $(CC) -fno-stack-protector -x c -E - < /dev/null >/dev/null 2>&1 SP_TEST = $(CC) -fno-stack-protector -x c -c /dev/null \
-o /dev/null >/dev/null 2>&1
SP_FLAGS := $(shell $(SP_TEST) && $(ECHO) '-fno-stack-protector') SP_FLAGS := $(shell $(SP_TEST) && $(ECHO) '-fno-stack-protector')
CFLAGS += $(SP_FLAGS) CFLAGS += $(SP_FLAGS)