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Subject: Re: [Qemu-devel] [PATCH] configure: Default to 'cc', not 'gcc',
	on MacOS X
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>, Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org, patches@linaro.org

Am 22.11.2012 00:19, schrieb Peter Maydell:
> On 17 November 2012 13:10, Peter Maydell <peter.maydell@linaro.org> wrote:
>> On 17 November 2012 13:02, Andreas Färber <andreas.faerber@web.de> wrote:
>>> Am 16.11.2012 17:37, schrieb Peter Maydell:
>>>> +if test "$(uname -s)" = "Darwin"; then
>>>> +  # On MacOS X the standard supported system compiler is 'cc' (usually clang),
>>>> +  # and 'gcc' is a legacy llvm-gcc which is rather elderly and best avoided.
>>>
>>> This comment strikes me as wrong in this generality. It should at least
>>> be qualified with OSX version numbers.
>>
>> How about "and if 'gcc' is not the same as 'cc' then it is a legacy llvm-gcc
>> which is rather elderly and best avoided" ? I'd rather not get into having
>> to research which versions of OSX shipped with which compiler as 'cc',
>> when really the point is that 'cc' will always give you whichever compiler
>> Apple thought was the best default for that version.
> 
> Andreas: ping? are you happy with this suggested rephrasing?

Not quite... clang is a relatively new thing. On v10.5.8 ppc64 'cc' is a
symlink to a real (well, Apple-flavoured) 'gcc-4.0'.

What about "... (clang on recent systems) and 'gcc' may be a legacy
llvm-gcc ..."?

> Do you
> think this is 1.3 material? (now the static-stublib stuff is in it's
> less critical, but it still seems like the right idea...)

I wouldn't be opposed to taking the default change into 1.3 as long as
we can still override it to a specific compiler.

But then again there's the question of why not doing it on Linux as well
now that we seem to compile under clang, we have cc -> gcc-4.7 on
openSUSE 12.2. Among our supported platforms only Solaris comes to my
mind where cc might be an incompatible proprietary compiler.

Andreas