[SCM] GNU Autoconf source repository branch, master, updated. v2.68-100-ga8942db

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit a8942db4d787ec19033e143151d79c5f2dac4046
Author: Paul Eggert <address@hidden>
Date:   Mon Dec 5 14:21:44 2011 -0800

    doc: document GNU make's \#
    
    * doc/autoconf.texi (Comments in Make Macros): Also mention \#
    in the right hand side of a macro, as an unportable usage.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |    9 ++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 68dffef..f9f4b90 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-12-05  Paul Eggert  <address@hidden>
+
+       doc: document GNU make's \#
+       * doc/autoconf.texi (Comments in Make Macros): Also mention \#
+       in the right hand side of a macro, as an unportable usage.
+
 2011-11-11  Eric Blake  <address@hidden>
 
        doc: tweak previous commit
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 0569a27..d7d2231 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -20214,9 +20214,12 @@ CPPFLAGS = "-DCOMMENT_CHAR='#'"
 
 @noindent
 as @samp{CPPFLAGS} may be expanded to @samp{"-DCOMMENT_CHAR='}.
-Luckily, most @command{make} implementations disregard this and treat
-single and double quotes specially here; @pxref{Comments in Make Rules},
-for a more portable alternative.
+
+Most @command{make} implementations disregard this and treat single and
+double quotes specially here.  Also, GNU @command{make} lets you put
address@hidden into a macro value by escaping it with a backslash, i.e.,
address@hidden  However, neither of these usages are portable.
address@hidden in Make Rules}, for a portable alternative.
 
 Even without quoting involved, comments can have surprising effects,
 because the whitespace before them is part of the variable value:


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