kbuild: Fix passing -Wno-* options to gcc 4.4+

commit 8417da6f2128008c431c7d130af6cd3d9079922e upstream.

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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 71c602d61680d422694a81c08b0cd4f802e18e7c..ab8689b94d65ee635902bbd538517c0165cd8409 100644 (file)
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -502,6 +502,18 @@ more details, with real examples.
        gcc >= 3.00. For gcc < 3.00, -malign-functions=4 is used.
        Note: cc-option-align uses KBUILD_CFLAGS for $(CC) options
 
+    cc-disable-warning
+       cc-disable-warning checks if gcc supports a given warning and returns
+       the commandline switch to disable it. This special function is needed,
+       because gcc 4.4 and later accept any unknown -Wno-* option and only
+       warn about it if there is another warning in the source file.
+
+       Example:
+               KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
+
+       In the above example, -Wno-unused-but-set-variable will be added to
+       KBUILD_CFLAGS only if gcc really accepts it.
+
     cc-version
        cc-version returns a numerical version of the $(CC) compiler version.
        The format is <major><minor> where both are two digits. So for example

diff --git a/Makefile b/Makefile
index e9fafd059cc15dc781d3ba0d0b463fc94df4a176..92da473633338060e18b5aec030b26949a8dd94f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -549,7 +549,7 @@ endif
 
 # This warning generated too much noise in a regular build.
 # Use make W=1 to enable this warning (see scripts/Makefile.build)
-KBUILD_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable)
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 
 ifdef CONFIG_FRAME_POINTER
 KBUILD_CFLAGS  += -fno-omit-frame-pointer -fno-optimize-sibling-calls
@@ -579,7 +579,7 @@ CHECKFLAGS     += $(NOSTDINC_FLAGS)
 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 
 # disable pointer signed / unsigned warnings in gcc 4.0
-KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
+KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 
 # disable invalid "can't wrap" optimizations for signed / pointers
 KBUILD_CFLAGS  += $(call cc-option,-fno-strict-overflow)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index ed2773edfe71bae99adc0a7b64a454912dfd4477..ba25c440f9f6aa8ce7e270c77146f8b9e22a23f0 100644 (file)
--- 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))