[issue8211] configure: ignore AC_PROG_CC hardcoded CFLAGS

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

STINNER Victor wrote:
> 
> STINNER Victor <victor.stinner at haypocalc.com> added the comment:
> 
> MaL> It unconditionally overrides CFLAGS - even if it is not 
> MaL> set and defined by AC_PROG_CC as "-g -O2". That would need 
> MaL> to be corrected.
> MaL>
> MaL> Other than that it does help a little work around the mess :-)
> 
> I commited my patch: r79392 (trunk). I'm waiting for the buildbots before porting to other branches :-)
> 
> On my Linux, .c files are now compiled with:
>  - "-fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall ..." (default)
>  - "-fno-strict-aliasing -g -Wall ..." (--with-pydebug): no more compiler optimization hurting gdb ;-)

The patch you checked in still unconditionally overrides the
CFLAGS setting applied by AC_PROG_CC in case no CFLAGS variable
is set.

Please fix that or revert the patch.

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<http://bugs.python.org/issue8211>
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