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Subject:	[Paul Stodghill <stodghil AT cs DOT cornell DOT edu>] Re: XEmacs 21.2.46 doesn't configure properly under cygwin
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From:	"Dr. Volker Zell" <Dr DOT Volker DOT Zell AT oracle DOT com>
Date:	23 Mar 2001 18:31:26 +0100
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Hi

I'm copying this from the xemacs-beta list.

Paul Stodghill <stodghil AT cs DOT cornell DOT edu> writes:

>>>>> "Volker" == Volker Zell <Dr.> writes:

    Volker> Hi I get the following error when trying to configure the
    Volker> latest xemacs under cygwin as usual (this means for me the
    Volker> following configure run):
    Volker> [...]
    Volker> `__STDC__' redefined configure: failed program was:
    Volker> #line 6448 "configure" include "confdefs.h" include
    Volker> #<X11/Intrinsic.h>
    Volker> [...]
    Volker> By the way I use:
    Volker> gcc driver version 2.95.3-1 (cygwin special) executing gcc
    Volker> version gcc-2.95.3-1

I see this problem too.

This is a result of interaction between four packages under cygwin: xemacs,
gcc, autoconf and x11.

The version of X11 that Volker and I have installed under cygwin contains
the following line in /usr/X11R6/lib/X11/config/cygwin.cf

#define StandardDefines         -D__i386__ -DWIN32_LEAN_AND_MEAN -DX_LOCALE -D_MT -D_X86_ -D__STDC__ -DNO_TCP_H -D__CYGWIN__ -D_XOPEN_SOURCE -D_REENTRANT -D_POSIX_C_SOURCE=199309L -D_BSD_SOURCE -D_SVID_SOURCE -D_GNU_SOURCE

(It seems totally bogus to me. Why are __STDC__ and __CYGWIN__ being -D'ed
from the command line?)

XEmacs's configure script takes the -D__STDC__ and transforms it into a
`#define __STDC__ 1' line in its confdefs.h.

gcc 2.95.2 did not complain about __STDC__ being redefined in confdefs.h
gcc 2.95.3 gives a warning. The configure script (autoconf, really)
interprets the warning as an indication that X11/Intrinsic.h doesn't exist.
Hence the error.

Off the top of my head, here are some ideas for fixing the problem,
- fix X11's cygwin.cf. Does cygwin-xfree have this problem?
- fix autoconf to ignore warnings when determining the existing of header
  files.
- change XEmacs's configure script so that it doesn't add __STDC__ to
  confdefs.h

===========================================================================
--- configure.in~	Mon Mar 19 14:09:20 2001
+++ configure.in	Fri Mar 23 12:09:05 2001
@@ -2753,7 +2753,9 @@
     cd ..
     rm -fr conftestdir
     for word in $xmkmf_defines; do
-      case "$word" in -D* )
+      case "$word" in 
+      -D__STDC__*) ;;
+      -D* )
 	sym=`echo '' $word | sed -e 's:^ *-D::' -e 's:=.*::'`
 	case "$word" in
 	  -D*=* ) val=`echo '' $word | sed -e 's:^.*=::'` ;;
===========================================================================

Does anyone have any other ideas? Does this problem show up on any systems
other than cygwin?



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