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Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used
From: |
Marko Lindqvist |
Subject: |
Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used |
Date: |
Mon, 8 Sep 2014 19:37:23 +0300 |
On 8 September 2014 17:29, Eric Blake <address@hidden> wrote:
> On 09/08/2014 02:44 AM, Thomas Jahns wrote:
>> On 09/08/14 06:24, Paul Smith wrote:
>>> In particular, this:
>>>
>>> configure:3666: checking whether we are using the GNU C compiler
>>> configure:3685: clang -c -mmacosx-version-min=10.6 conftest.c >&5
>>> configure:3685: $? = 0
>>> configure:3694: result: yes
>>>
>>> Appears to show that clang is defining the __GNUC__ built-in compiler
>>> flag, presumably for compatibility with GCC source code. So IF there's
>>> any real problem here, which I'm not sure there is, the problem is in
>>> clang claiming to be something it's not.
>>
>> Happens just the same for icc and since the Intel compiler supports enough of
>> the pragma's and non-std features of gcc, this works out fine for me so far.
>
> Maybe it's as simple as patching autoconf to change the message to
> "checking whether the compiler understands GNU C extensions", to match
> the reality of how it works these days.
>
The $GCC example brings up another problem, though. Even though
autoconf itself works perfectly by treating clang as gcc (and clang++
as g++), user scripts may not. Is there need to update documentation
abour $GCC to say that it should not be taken literally, but just to
mean some kind of gcc compatibility.
- ML
- AC_PROG_CC wrongly setting $GCC=yes while clang is used, Bastien Chevreux, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Paul Smith, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Thomas Jahns, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Eric Blake, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Paul Eggert, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used,
Marko Lindqvist <=
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Paul Eggert, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Bastien Chevreux, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Paul Eggert, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Bastien Chevreux, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Marko Lindqvist, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Bastien Chevreux, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Marko Lindqvist, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Bastien Chevreux, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Marko Lindqvist, 2014/09/08
- Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used, Bastien Chevreux, 2014/09/08