Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1

[Michael Karcher]

Hello Adrian,
> Could you post a kernel patch for that? I would be happy to test it on my
> SH-7785CLR board. Also, I'm going to file a bug report against GCC.

I filed the bug already. It's 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108483.

The diff is attached. It's published as CC0 in case anyone considers 
this trivial change copyrightable. This patch prevents this one specific 
warning from being upgraded to "error" even if you configure the kernel 
to use "-Werror". It still keeps it active as warning, though.

Kind regards,
   Michael Karcher
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diff --git a/Makefile b/Makefile
index e09fe100efb2..b4cd075c6a19 100644
--- a/Makefile
+++ b/Makefile
@@ -870,7 +870,7 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 
 KBUILD_CFLAGS += $(stackp-flags-y)
 
-KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
+KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror -Wno-error=sizeof-pointer-div
 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds