autoconf 2.52a-1: M4PATH not being honoured through wrapper script.

[James Harvey]

I've been converting some of our build system to use the cygwin autotools
recently, and I think I've come across a bug in the autoconf/autoheader
wrapper scripts (I assume these may occur in the other auto* scripts, but
these are the specific ones I use).

Our build script sets up M4PATH to the location of some company-specific m4
macro files before calling autoconf; on every other UNIX we've come across,
this works fine for autoconf and also autoheader.

However, the cygwin wrappers explicitly redefine M4PATH *without* including
the original value; this is after adding to PATH in the expected way.

I don't quite understand this; the m4 documentation says M4PATH is a
colon-separated list of directory names, and I'm pretty sure it shouldn't
just be redefined in this way.

I've appended a patch for the autoconf wrapper; if I'm correct this'll need
to be applied to all the other wrapper scripts that need the extra m4 path
themselves.

Another problem I've found is that the check for AC_PREREQ in the autotools
wrappers only searches through configure.in and not any m4 files that might
be included from it. This means I have to add this line to a number of
different configure.in files rather than just changing one of the
company-specific m4 files. I can't think of an easy fix for this, though.

Cheers,

-James Harvey

--- autoconf    Mon Feb 25 17:04:37 2002
+++ autoconf~   Mon Feb 25 15:25:15 2002
@@ -200,14 +200,14 @@
 if [ "x${VER_MIN}" != "x" ] ; then
   if (( ${VER_MIN} <= 13 )) ; then
     export PATH=${AUTO_STABLE}/bin:${PATH}
+    export M4PATH=${AUTO_STABLE}/share/autoconf:${M4PATH}
-    export M4PATH=${AUTO_STABLE}/share/autoconf
   else
     export PATH=${AUTO_DEVEL}/bin:${PATH}
+    export M4PATH=${AUTO_DEVEL}/share/autoconf:${M4PATH}
-    export M4PATH=${AUTO_DEVEL}/share/autoconf
   fi
 else
   export PATH=${AUTO_DEVEL}/bin:${PATH}
+  export M4PATH=${AUTO_DEVEL}/share/autoconf:${M4PATH}
-  export M4PATH=${AUTO_DEVEL}/share/autoconf
 fi

 # exec the "real" autoconf



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