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Date:	Wed, 22 Aug 2007 00:46:54 -0700
From:	Brian Dessent <brian AT dessent DOT net>
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To:	Angelo Graziosi <Angelo DOT Graziosi AT roma1 DOT infn DOT it>
CC:	fortran AT gcc DOT gnu DOT org, cygwin AT cygwin DOT com, gcc AT gcc DOT gnu DOT org
Subject:	Re: WARNING bootstrapping GFortran on Cygwin
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Angelo Graziosi wrote:

> configure: WARNING: fixed-point is not supported for this target
>            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> checking whether make sets $(MAKE)... yes
> ...
> 
> This warning was absent with the bootstrap I did 20070819 trunk-127626.

That's because this is a new feature that was just merged.  The specific
patch that added it seems to be
<http://gcc.gnu.org/ml/gcc-patches/2007-08/msg01070.html>.

+AC_ARG_ENABLE(fixed-point,
+[  --enable-fixed-point    enable fixed-point arithmetic extension to
C],
+[
+],
+[
+  case $target in
+    mips*-*-*)
+      enable_fixed_point=yes
+      ;;
+    *)
+      AC_MSG_WARN(fixed-point is not supported for this target,
ignored)
+      enable_fixed_point=no
+      ;;
+  esac
+])

It does seem a bit spurious to AC_MSG_WARN on all non-supported targets,
even if the user didn't attempt any --enable-fixed-point, but you can at
least silence it with --disable-fixed-point.

> Should I 'tune' the build adding something in 'configure' ?

Pretty sure this requires hardware support, e.g. on a DSP. Not the kind
of thing they make configure switches for... :)

Brian

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