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[PATCH, configure, libgfortran]: PR78478: Use fpu-generic for x86 when _SOFT_FLOAT is defined

Hello!

Attached patch avoids bootstrap error when building libgfortran for
soft-float x86 targets.  Configure detects when _SOFT_FLOAT is defined
and uses fpu-generic.h instead of fpu-387.h header.

The patch also imports ax_check_define.m4 from autoconf archive [1] -
the macro is really handy, and I guess it can be used in many other
places, avoiding reinventing the wheel.

2017-01-19  Uros Bizjak  <ubizjak@gmail.com>

    PR target/78478
    * config/ax_check_define.m4: New file.

libgfortran/ChangeLog:

2017-01-19  Uros Bizjak  <ubizjak@gmail.com>

    PR target/78478
    * acinclude.m4: Include ../config/ax_check_define.m4
    * configure.ac: Check if _SOFT_FLOAT is defined.
    * configure.host (i?86 | x86_64): Use fpu-generic when
    have_soft_float is set.
    * configure: Regenerate.

Patch was bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

OK for mainline and gcc-6 branch?

[1] https://www.gnu.org/software/autoconf-archive/ax_check_define.html

Uros.

Attachment: f.diff.txt
Description: Text document

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