Re: Interix identification.

[Akim Demaille]

| > From: Akim Demaille <address@hidden>
| > Date: 22 Jul 2002 17:33:13 +0200
| > 
| > Paul> AIX and Interix use _ALL_SOURCE, Solaris uses __EXTENSIONS__,
| > Paul> GNU uses _GNU_SOURCE, HP/UX uses _HPUX_SOURCE, and Minix uses
| > Paul> _MINIX, _POSIX_SOURCE and _POSIX_1_SOURCE.  Currently these
| > Paul> symbols are scattered over several macros (AC_PROG_CC,
| > Paul> AC_GNU_SOURCE, AC_AIX, AC_MINIX) but perhaps they should all be
| > Paul> folded into AC_PROG_CC (with an option to turn them off,
| > Paul> perhaps?).  
| > 
| > I agree: they should be on by default.
| 
| OK, how about the following plan for implementing it:
| 
| * Change the spec for AC_PROG_CC.  Currently it tries to put the C
|   compiler in ANSI C mode by default.  We should change this spec so
|   that AC_PROG_CC tries to change the compiler to be the "nicest"
|   mode, i.e. support for the latest standard features (currently ISO
|   C99) plus support for all vendor extensions, even when they are
|   incompatible with C99.  The basic idea here is that AC_PROG_CC
|   should disable pedanticisms and should enable extensions.
| 
| * Deprecate AC_GNU_SOURCE, AC_AIX, and AC_MINIX, as they will be
|   superseded by the above changes.

Fine with me.  TODO for 2.55?