From abe017f60d93dfc22f28e79006f58df97a0761e1 Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim@epita.fr>
Date: Mon, 25 Feb 2002 14:00:57 +0000
Subject: [PATCH] * m4/m4.m4: New, from CVS Autoconf. * configure.in: Invoke
 it. * src/output.c (output_skeleton): Use its result instead of the hard
 coded name.

---
 ChangeLog      |  7 +++++++
 configure.in   |  5 +++++
 m4/Makefile.am |  1 +
 src/output.c   | 12 +++++++-----
 4 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 9689d207..e75aec85 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2002-02-25  Akim Demaille  <akim@epita.fr>
+
+	* m4/m4.m4: New, from CVS Autoconf.
+	* configure.in: Invoke it.
+	* src/output.c (output_skeleton): Use its result instead of the
+	hard coded name.
+
 2002-02-25  Akim Demaille  <akim@epita.fr>
 
 	* lib/tempname.c, lib/mkstemp.c, m4/mkstemp.m4: New, stolen from
diff --git a/configure.in b/configure.in
index 2cf4e6ff..654caf29 100644
--- a/configure.in
+++ b/configure.in
@@ -42,6 +42,11 @@ AC_ISC_POSIX
 AM_PROG_CC_STDC
 AC_PROG_RANLIB
 AM_MISSING_PROG([AUTOM4TE], [autom4te])
+BISON_PROG_GNU_M4
+if test x"$ac_cv_prog_gnu_m4" != xyes; then
+  AC_MSG_ERROR([GNU M4 1.4 is required])
+fi
+AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the GNU M4 executable name.])
 
 AC_ARG_ENABLE(gcc-warnings,
 [  --enable-gcc-warnings   turn on lots of GCC warnings (not recommended)],
diff --git a/m4/Makefile.am b/m4/Makefile.am
index 1a5d1041..0eb44e2c 100644
--- a/m4/Makefile.am
+++ b/m4/Makefile.am
@@ -9,6 +9,7 @@ glibc21.m4					\
 iconv.m4					\
 isc-posix.m4					\
 lcmessage.m4					\
+m4.m4						\
 malloc.m4					\
 mbrtowc.m4					\
 mbstate_t.m4					\
diff --git a/src/output.c b/src/output.c
index 171f66cb..65a7d5b2 100644
--- a/src/output.c
+++ b/src/output.c
@@ -1001,15 +1001,17 @@ output_skeleton (void)
   /* Invoke m4 on the definition of the muscles, and the skeleton. */
   {
     const char *bison_pkgdatadir = getenv ("BISON_PKGDATADIR");
+    const char *m4 = getenv ("M4");
+    if (!m4)
+      m4 = M4;
     if (!bison_pkgdatadir)
       bison_pkgdatadir = PKGDATADIR;
     if (trace_flag)
       fprintf (stderr,
-	       "running: m4 -I %s m4sugar/m4sugar.m4 %s %s\n",
-	       bison_pkgdatadir, tempfile, skeleton);
-    skel_in = readpipe ("m4",
-			"-I",
-			bison_pkgdatadir,
+	       "running: %s -I %s m4sugar/m4sugar.m4 %s %s\n",
+	       m4, bison_pkgdatadir, tempfile, skeleton);
+    skel_in = readpipe (m4,
+			"-I", bison_pkgdatadir,
 			"m4sugar/m4sugar.m4",
 			tempfile,
 			skeleton,
-- 
2.45.2