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Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used
From: |
Eric Blake |
Subject: |
Re: AC_PROG_CC wrongly setting $GCC=yes while clang is used |
Date: |
Mon, 08 Sep 2014 08:29:45 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0 |
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.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- 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 <=
- 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, 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, 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