From: Andi Kleen Compiling an allyesconfig kernel straight with a gcc 4.0 snapshot gives nearly 10k new warnings like: warning: pointer targets in passing argument 5 of `cpuid' differ in signedness Since the sheer number of these warnings was too much even for the most determined kernel janitors (I actually asked ;-) and I don't think it's a very serious issue to have these mismatches I submitted an new option to gcc to disable it. It was incorporated in gcc mainline now. This patch makes the kernel compilation use it. There are still quite a lot of new warnings with 4.0 (mostly about uninitialized variables), but the compile log looks much nicer nnow. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton --- 25-akpm/Makefile | 3 +++ 1 files changed, 3 insertions(+) diff -puN Makefile~use-wno-pointer-sign-for-gcc-40 Makefile --- 25/Makefile~use-wno-pointer-sign-for-gcc-40 2005-01-18 21:01:04.947029016 -0800 +++ 25-akpm/Makefile 2005-01-18 21:01:04.951028408 -0800 @@ -534,6 +534,9 @@ include $(srctree)/arch/$(ARCH)/Makefile # warn about C99 declaration after statement CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) +# disable pointer signedness warnings in gcc 4.0 +CFLAGS += $(call cc-option,-Wno-pointer-sign,) + # Default kernel image to build when no specific target is given. # KBUILD_IMAGE may be overruled on the commandline or # set in the environment _