[issue8211] configure: ignore AC_PROG_CC hardcoded CFLAGS

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

MaL> The patch you checked in still unconditionally overrides the
MaL> CFLAGS setting applied by AC_PROG_CC in case no CFLAGS variable
MaL> is set.
MaL>
MaL> The issue now is: AC_PROG_CC no longer initializes CFLAGS 
MaL> if not set.

Sorry, but I don't understand. Why should it be initialized?

I don't like the default value because it enables optimization when --with-pydebug is used and I consider that as a bug. If no configure option is used, Python adds -O3 as before. About -g: Python always add it, so the -g from AC_PROG_CC was redundant.

In Makefile.pre.in, prefixes and suffixes are added to the CFLAGS: "CFLAGS= $(BASECFLAGS) @CFLAGS@ $(OPT) $(EXTRA_CFLAGS)". But I consider this as a separate issue.

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