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| author | Michal Marek <mmarek@suse.cz> | 2011-05-02 12:51:15 +0200 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2011-05-03 10:50:54 +0200 |
| commit | 8417da6f2128008c431c7d130af6cd3d9079922e (patch) | |
| tree | 79bfdaadfc1548826651b9b0378e70e60cdc7720 /scripts/Kbuild.include | |
| parent | bffd2020a972a188750e5cf4b9566950dfdf25a2 (diff) | |
| download | lwn-8417da6f2128008c431c7d130af6cd3d9079922e.tar.gz lwn-8417da6f2128008c431c7d130af6cd3d9079922e.zip | |
kbuild: Fix passing -Wno-* options to gcc 4.4+
Starting with 4.4, gcc will happily accept -Wno-<anything> in the
cc-option test and complain later when compiling a file that has some
other warning. This rather unexpected behavior is intentional as per
http://gcc.gnu.org/PR28322, so work around it by testing for support of
the opposite option (without the no-). Introduce a new Makefile function
cc-disable-warning that does this and update two uses of cc-option in
the toplevel Makefile.
Reported-and-tested-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'scripts/Kbuild.include')
| -rw-r--r-- | scripts/Kbuild.include | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index fae2d8d8cb09..c034dd7161a6 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -118,6 +118,11 @@ cc-option-yn = $(call try-run,\ cc-option-align = $(subst -functions=0,,\ $(call cc-option,-falign-functions=0,-malign-functions=0)) +# cc-disable-warning +# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) +cc-disable-warning = $(call try-run,\ + $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1))) + # cc-version # Usage gcc-ver := $(call cc-version) cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |