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From: Sam James <sam@gentoo.org>
To: Sam James <sam@gentoo.org>, Zack Weinberg <zack@owlfolio.org>
Cc: bug-autoconf@gnu.org, c-std-porting@lists.linux.dev
Subject: Re: Missing <stdlib.h> include in lib/autoconf/c.m4
Date: Fri, 11 Nov 2022 03:18:05 +0000	[thread overview]
Message-ID: <0B8F55B0-E16F-45B1-8037-ED96A12CF0F4@gentoo.org> (raw)
In-Reply-To: <A7F4BEF8-2E51-4390-A137-4998A19A8EB7@gentoo.org>

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> On 5 Nov 2022, at 22:37, Sam James <sam@gentoo.org> wrote:
>> On 5 Nov 2022, at 05:07, Sam James <sam@gentoo.org> wrote:
>> Hello,
>> When working on Clang 16 (and presumably GCC 14) porting [0], I noticed the following
>> when building GNU grep 3.8:
>> ```
>> configure:6215: checking for clang-16 option to enable C11 features
>> configure:6230: clang-16  -c -g -O2  conftest.c >&5
>> conftest.c:26:14: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
>> static char *e (p, i)
>>            ^
>> conftest.c:246:3: error: call to undeclared library function 'free' with type 'void (void *)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>> free (ia);
>> ^
>> conftest.c:246:3: note: include the header <stdlib.h> or explicitly provide a declaration for 'free'
>> 1 warning and 1 error generated.
>> [...]
>> ```
> I would send a patch for the original issue but I'm wondering how to handle freestanding (see big comment above _AC_C_C89_TEST_GLOBALS).
> We need another one (<assert.h>) I think for _Static_assert in _AC_C_C11_TEST_GLOBALS too, up until C23?

It looks like the original issue is fixed (https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=bf5a75953b6d504f0405b1ca33b039b8dd39eef4)
but I think we still need treatment for _Static_assert?

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       reply	other threads:[~2022-11-11  3:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <04038EC0-622D-4806-97A3-465124CD25F7@gentoo.org>
     [not found] ` <A7F4BEF8-2E51-4390-A137-4998A19A8EB7@gentoo.org>
2022-11-11  3:18   ` Sam James [this message]
2022-11-11  3:25     ` Missing <stdlib.h> include in lib/autoconf/c.m4 Zack Weinberg
2022-11-11  3:28       ` Sam James

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