Avoid trailing space in config.h with AC_DEFINE([var], []).

* lib/autoconf/general.m4 (_AC_DEFINE_Q): Explicitly mark empty
defines with a comment.

Signed-off-by: Eric Blake <ebb9@byu.net>

diff --git a/ChangeLog b/ChangeLog
index 4ee1cd4638de94f48f5dec200070e3f39e3a022e..8fe8873dc5bb23c1597234c6e46c007cc55afbf0 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-02-12  Eric Blake  <ebb9@byu.net>
+
+       Avoid trailing space in config.h with AC_DEFINE([var], []).
+       * lib/autoconf/general.m4 (_AC_DEFINE_Q): Explicitly mark empty
+       defines with a comment.
+
 2008-02-08  Eric Blake  <ebb9@byu.net>
 
        Fix texinfo typos in previous patch.

diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index 92483db3dcdfc738216a85bf7c4c28258884ce33..645108e05c80aac44d991184181414ceed5a4dbd 100644 (file)
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -2056,7 +2056,7 @@ m4_cond([m4_index([$3], [
 m4_ifval([$4], [AH_TEMPLATE(AC_name, [$4])])dnl
 m4_popdef([AC_name])dnl
 cat >>confdefs.h <<$1_ACEOF
-[@%:@define] $2 m4_if($#, 2, 1, [$3])
+[@%:@define] $2 m4_if([$#], 2, 1, [$3], [], [/**/], [$3])
 _ACEOF
 ])