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[build] Avoid spurious address comparison warnings in gcc 4.6 

A construction such as "assert ( ptr != NULL )" seems to trigger a
false positive warning in gcc 4.6 if the value of "ptr" is known at
compile-time to be non-NULL.  Use -Wno-address to inhibit this
warning.

Reported-by: Ralph Giles <giles@thaumas.net>
Tested-by: Ralph Giles <giles@thaumas.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2011-03-16 18:10:49 +00:00
parent 511fd46976
commit c8e51f80a8
1 changed files with 9 additions and 0 deletions
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9
src/Makefile.housekeeping
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@ -148,6 +148,15 @@ CFI_FLAGS := $(shell $(CFI_TEST) && $(ECHO) '-fno-dwarf2-cfi-asm')
WORKAROUND_CFLAGS += $(CFI_FLAGS)
endif
# gcc 4.6 generates spurious warnings if -Waddress is in force.
# Inhibit this.
#
ifeq ($(CCTYPE),gcc)
WNA_TEST = $(CC) -Wno-address -x c -c /dev/null -o /dev/null >/dev/null 2>&1
WNA_FLAGS := $(shell $(WNA_TEST) && $(ECHO) '-Wno-address')
WORKAROUND_CFLAGS += $(WNA_FLAGS)
endif
# Some versions of gas choke on division operators, treating them as
# comment markers. Specifying --divide will work around this problem,
# but isn't available on older gas versions.