[SCM] GNU Autoconf source repository branch, master, updated. v2.65-41-gb4d3a51

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- Log -----------------------------------------------------------------
commit b4d3a51a96f83c2f5f6eefc34ec87a2eddfb5f45
Author: Eric Blake <[email protected]>
Date:   Wed Sep 9 08:32:46 2009 -0600

    Optimize AC_REPLACE_FUNCS.
    
    * lib/autoconf/functions.m4 (_AC_REPLACE_FUNC): New helper macro.
    (AC_REPLACE_FUNCS): Use it to reduce forks when checking for
    replacements, by using literal rather than shell variable.
    
    Signed-off-by: Eric Blake <[email protected]>

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

Summary of changes:
 ChangeLog                 |    5 +++++
 lib/autoconf/functions.m4 |   17 ++++++++++++++---
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index bb24886..98e0b31 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2010-02-26  Eric Blake  <[email protected]>
 
+	Optimize AC_REPLACE_FUNCS.
+	* lib/autoconf/functions.m4 (_AC_REPLACE_FUNC): New helper macro.
+	(AC_REPLACE_FUNCS): Use it to reduce forks when checking for
+	replacements, by using literal rather than shell variable.
+
 	Document how to safely override CFLAGS default.
 	* doc/autoconf.texi (C Compiler) <AC_PROG_CC>: Document a way to
 	change the default CFLAGS.
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index 24dcf86..aae7220 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -116,12 +116,23 @@ m4_define([_AC_FUNCS_EXPANSION],
 ])
 
 
+# _AC_REPLACE_FUNC(FUNCTION)
+# --------------------------
+# If FUNCTION exists, define HAVE_FUNCTION; else add FUNCTION.c
+# to the list of library objects.  FUNCTION must be literal.
+m4_define([_AC_REPLACE_FUNC],
+[AC_CHECK_FUNC([$1],
+  [_AH_CHECK_FUNC([$1])AC_DEFINE(AS_TR_CPP([HAVE_$1]))],
+  [AC_LIBOBJ([$1])])])
+
 # AC_REPLACE_FUNCS(FUNCTION...)
 # -----------------------------
+# For each FUNCTION in the whitespace separated list, perform the
+# equivalent of AC_CHECK_FUNC, then call AC_LIBOBJ if the function
+# was not found.
 AC_DEFUN([AC_REPLACE_FUNCS],
-[m4_map_args_w([$1], [AC_LIBSOURCE(], [.c)])]dnl
-[AC_CHECK_FUNCS([$1], , [_AC_LIBOBJ($ac_func)])
-])
+[m4_map_args_w([$1], [_AC_REPLACE_FUNC(], [)
+])])
 
 
 # AC_TRY_LINK_FUNC(FUNC, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)


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