[Patch V2] libgfortran: do not assume libm

[Tristan Gingold]

On Mar 22, 2012, at 11:06 AM, Paolo Bonzini wrote:

> Il 22/03/2012 09:30, Tristan Gingold ha scritto:
>> Hi,
>> 
>> this is version 2 of the patch.
>> 
>> The initial problem is that libgfortran configure.ac used AC_CHECK_LIB([m]…) to check wether several math functions are available.  That doesn't work on VMS, because there is no such things as a libm.
>> 
>> It seems to me that there are no autoconf macro to check wether a function is available: AC_CHECK_FUNC[S] don't allow to specify additional include files (necessary on VMS as some math functions are renamed through macros), and AC_CHECK_DECL only checks the presence of the declaration (as pointed out by Ralf).
>> 
>> So I have finally learnt a little bit more about autoconf and added a new file: config/math.m4 (build machinery maintainer cc:)
>> libgfortran/configure.ac now uses the new GCC_CHECK_MATH_FUNC macro.
>> 
>> Bootstrapped without gfortran regressions on x86_64-darwin.
>> 
>> Ok for trunk ?
>> 
>> (I will submit a follow-up change in libquadmath once this change is approved).
>> 
>> Tristan.
>> 
>> config/
>> 2012-03-22  Tristan Gingold  <gingold@adacore.com>
>> 
>> 	* math.m4: New file.
>> 
>> libgfortran/
>> 2012-03-22  Tristan Gingold  <gingold@adacore.com>
>> 
>> 	* configure.ac: Use GCC_CHECK_MATH_FUNC for math functions.
>> 	* acinclude.m4: Include ../config/math.m4
>> 	* configure: Regenerate.
>> 	* Makefile.in: Regenerate.
> 
> Ok.

Thanks, now committed.

Tristan.