[SCM] GNU Autoconf source repository branch, master, updated. v2.63-101-g89e95fc

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 89e95fc78b3481deb160488b930b498dfc406c2b
Author: Eric Blake <address@hidden>
Date:   Fri Oct 24 16:41:20 2008 -0600

    Speed up AC_CHECK_HEADER.
    
    * lib/autoconf/headers.m4 (AC_CHECK_HEADER): Factor out address@hidden
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog               |    5 +++++
 lib/autoconf/headers.m4 |   10 ++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 61b5f33..a485066 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-10-24  Eric Blake  <address@hidden>
+
+       Speed up AC_CHECK_HEADER.
+       * lib/autoconf/headers.m4 (AC_CHECK_HEADER): Factor out address@hidden
+
 2008-10-24  Paolo Bonzini  <address@hidden>
        and Eric Blake  <address@hidden>
 
diff --git a/lib/autoconf/headers.m4 b/lib/autoconf/headers.m4
index 4012107..413be8c 100644
--- a/lib/autoconf/headers.m4
+++ b/lib/autoconf/headers.m4
@@ -84,11 +84,13 @@
 #
 # If INCLUDES is specified and different from `-', then use the new
 # semantics only.
+#
+# The m4_indir allows for fewer expansions of address@hidden
 AC_DEFUN([AC_CHECK_HEADER],
-[m4_case([$4],
-        [],  [_AC_CHECK_HEADER_MONGREL($@)],
-        [-], [_AC_CHECK_HEADER_OLD($@)],
-             [_AC_CHECK_HEADER_NEW($@)])
+[m4_indir(m4_case([$4],
+                 [],  [[_AC_CHECK_HEADER_MONGREL]],
+                 [-], [[_AC_CHECK_HEADER_OLD]],
+                      [[_AC_CHECK_HEADER_NEW]]), $@)
 ])# AC_CHECK_HEADER
 
 


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