GNU bug report logs - #44535
grep-3.6 released [stable]

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Message #14 received at 44535 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Andreas Schwab <schwab <at> suse.de>
Cc: 44535 <at> debbugs.gnu.org
Subject: Re: bug#44535: grep-3.6 released [stable]
Date: Thu, 12 Nov 2020 23:39:36 -0800

On 11/9/20 8:12 AM, Andreas Schwab wrote:
> grep 3.6 fails to build:
> 
> test-nl_langinfo-mt.c: In function 'threadN_func':
> test-nl_langinfo-mt.c:185:1: error: no return statement in function returning non-void [-Werror=return-type]
>    185 | }
>        | ^
> cc1: some warnings being treated as errors
> make[4]: *** [Makefile:4221: test-nl_langinfo-mt.o] Error 1

We have dueling compilers here, as Sun C complains if the return statements are 
present[1], whereas gcc -Wreturn-type complains if they're absent. Since the 
return statements are clearly bogus and unnecessary I'm inclined to continue to 
omit them.

> https://build.opensuse.org/package/live_build_log/home:Andreas_Schwab:Factory/grep/f/x86_64

This says you're configuring with CFLAGS='... -Werror=return-type ...'. If you 
omit the "-Werror=return-type" option the problem should go away. For 'grep', 
that option is more trouble than it's worth. (Perhaps someone should file a GCC 
bug report....)

For the recommended set of warning options for compiling 'grep', you can use 
'./configure --enable-gcc-warnings' instead.

[1] 
https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=bd90572c031a25e559907ae0c2b9fd3aa632893b

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