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    Subject[PATCH] Makefile: use -Wno-main in the full kernel tree
    Date
    When using gcc (SUSE Linux) 7.5.0 (on openSUSE 15.3), I see a
    build warning:

    ../kernel/trace/trace_osnoise.c: In function 'start_kthread':
    ../kernel/trace/trace_osnoise.c:1461:8: warning: 'main' is usually a function [-Wmain]
    void *main = osnoise_main;
    ^~~~

    Quieten that warning by using "-Wno-main". It's OK to use "main" as a
    declaration name in the kernel.

    Build-tested on most ARCHes.

    Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
    Suggested-by: Steven Rostedt <rostedt@goodmis.org>
    Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
    Cc: Masahiro Yamada <masahiroy@kernel.org>
    Cc: Michal Marek <michal.lkml@markovi.net>
    Cc: linux-kbuild@vger.kernel.org
    ---
    Makefile | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- linux-next-20210812.orig/Makefile
    +++ linux-next-20210812/Makefile
    @@ -522,7 +522,7 @@ KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-P
    KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
    -Werror=implicit-function-declaration -Werror=implicit-int \
    - -Werror=return-type -Wno-format-security \
    + -Werror=return-type -Wno-format-security -Wno-main \
    -std=gnu89
    KBUILD_CPPFLAGS := -D__KERNEL__
    KBUILD_RUST_TARGET := $(srctree)/arch/$(SRCARCH)/rust/target.json
    \
     
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