Re: Add clang++ to AC_PROG_CXX

[Ruben Safir]

On 03/16/2016 11:30 AM, Earnie wrote:
> On 3/16/2016 4:02 AM, Václav Haisman wrote:
>> On 15 March 2016 at 17:35, Paul Eggert <address@hidden> wrote:
>>> On 10/04/2012 12:41 AM, Václav Zeman wrote:
>>>>
>>>> Does attached patch work for you?
>>>
>>>
>>> Following up on this old thread, I applied the attached. In practice I
>>> expect this doesn't matter much, as people configure with CC=clang when they
>>> want clang. But we should at least fall back on clang if other C or C++ or
>>> ObjC compilers do not work.
>>
>> Cool. I do not remember exactly if this was my motivation for the
>> original submission but I believe this is still relevant for Cygwin
>> where you can AFAIK install Clang and not install GCC (which creates
>> the /usr/bin/cc to gcc). Without the patch, no compiler will be found
>> even though Clang is present. This patch fixes the situation.
>>
> 


That is not a bug, it was a desired feature...



> Rather than adding to this list of tools how about a configure.ac macro.
>  Something named AC_REQUIRE_TOOL sounds correct and then AC_CHECK_TOOLS
> also checks (or maybe an option to only check) the required tool.
> 
> The problem I find with the list of defaults is that it can grow and the
> more in the default list the longer the configure script will take.  If
> I have a C package then I don't want to test for anything but a C
> compiler.  I don't care about any of the others and testing for them
> slows down the build process for my package.
> 
> Yes I know I can set CC to be specific about which one but the users of
> the package may not have that set or may have something else entirely
> set.  My opinion is that the package maintainers need to be specific to
> the tools required and punish them by not choosing any if none is set.
> As a package maintainer I should also be able to set an option to ignore
> the environment variables for these checks since the package may be
> dependent on a specific named tool.
> 


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