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patch to make `Undefined Macros' slightly less stringent

From: David Benson
Subject: patch to make `Undefined Macros' slightly less stringent
Date: Thu, 9 Nov 2000 09:37:53 -0800 (PST)

The following very short patch prevents shell variables merely containing
the letters AC_ from triggering the "Undefined macros" warning.

To provoke this bug, try adding


to any  Autoconf will complain because AC_ is
a subscring of that line.

This patch forces the AC_ to be after a non-alphanumeric,
or at the start of the line.

It might be desirable to include _ in the added character sets,
doing so would suppress MY_AC_MACRO() from being caught if undefined.
who cares i guess...

- Dave


--- autoconf.orig       Thu Nov  9 09:24:17 2000
+++ autoconf    Thu Nov  9 09:27:43 2000
@@ -131,9 +131,11 @@
-if grep "^[^#]*${pattern}" $tmpout > /dev/null 2>&1; then
+if grep "^[^#]*[^A-Za-z0-9]${pattern}" $tmpout > /dev/null 2>&1 ||
+   grep "^${pattern}" $tmpout > /dev/null 2>&1; then
   echo "autoconf: Undefined macros:" >&2
-  sed -n "s/^[^#]*\\(${pattern}[_A-Za-z0-9]*\\).*/\\1/p" $tmpout |
+  sed -n "s/^[^#]*[^A-Za-z0-9]\\(${pattern}[_A-Za-z0-9]*\\).*/\\1/p;
+          s/^\\(${pattern}[_A-Za-z0-9]*\\).*/\\1/p;" $tmpout |
     while read macro; do
       grep -n "^[^#]*$macro" $infile /dev/null
       test $? -eq 1 && echo >&2 "***BUG in Autoconf--please report*** $macro"

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