linux-kernel - [PATCH 5.14 001/432] Makefile: use -Wno-main in the full kernel tree

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Date:   Thu, 16 Sep 2021 17:55:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org
Subject: [PATCH 5.14 001/432] Makefile: use -Wno-main in the full kernel tree

From: Randy Dunlap <rdunlap@...radead.org>

commit 49832c819ab85b33b7a2a1429c8d067e82be2977 upstream.

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.

[ v2: only do it for gcc, since clang doesn't have that particular warning ]

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Link: https://lore.kernel.org/lkml/20210813224131.25803-1-rdunlap@infradead.org/
Suggested-by: Steven Rostedt <rostedt@...dmis.org>
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michal Marek <michal.lkml@...kovi.net>
Cc: linux-kbuild@...r.kernel.org
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Makefile |    2 ++
 1 file changed, 2 insertions(+)

--- a/Makefile
+++ b/Makefile
@@ -803,6 +803,8 @@ else
 # Disabled for clang while comment to attribute conversion happens and
 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
+# gcc inanely warns about local variables called 'main'
+KBUILD_CFLAGS += -Wno-main
 endif
 
 # These warnings generated too much noise in a regular build.