[SCM] GNU Autoconf source repository branch, master, updated. v2.63-100-g2509abe

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 2509abe0dc371ffe74789dac9421d31019822133
Author: Paolo Bonzini <address@hidden>
Date:   Mon Oct 20 15:35:17 2008 +0200

    Use a shell function for AC_CHECK_FUNC.
    
    * lib/autoconf/functions.m4 (_AC_CHECK_FUNC_BODY): New macro.
    (AC_CHECK_FUNC): Use a shell function.
    * lib/autoconf/c.m4 (AC_LANG_SOURCE(C)): Reduce number of forks.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog                 |    8 ++++++++
 lib/autoconf/c.m4         |   23 +++++++++++------------
 lib/autoconf/functions.m4 |   30 +++++++++++++++++++++++-------
 3 files changed, 42 insertions(+), 19 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b26d7ca..61b5f33 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2008-10-24  Paolo Bonzini  <address@hidden>
+       and Eric Blake  <address@hidden>
+
+       Use a shell function for AC_CHECK_FUNC.
+       * lib/autoconf/functions.m4 (_AC_CHECK_FUNC_BODY): New macro.
+       (AC_CHECK_FUNC): Use a shell function.
+       * lib/autoconf/c.m4 (AC_LANG_SOURCE(C)): Reduce number of forks.
+
 2008-10-24  Eric Blake  <address@hidden>
 
        Work around fact that gnulib-tool doesn't use m4_copy.
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index f3b3e5f..90a091c 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -189,8 +189,7 @@ m4_define([_AC_LANG_PREFIX(Objective C)], [OBJC])
 m4_define([AC_LANG_SOURCE(C)],
 [/* confdefs.h.  */
 _ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
+cat confdefs.h - <<_ACEOF >>conftest.$ac_ext
 /* end confdefs.h.  */
 $1])
 
@@ -883,7 +882,7 @@ AC_DEFUN([AC_PROG_CXX_C_O],
 [AC_REQUIRE([AC_PROG_CXX])dnl
 AC_LANG_PUSH([C++])dnl
 AC_CACHE_CHECK([whether $CXX understands -c and -o together],
-               [ac_cv_prog_cxx_c_o],
+              [ac_cv_prog_cxx_c_o],
 [AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
 # We test twice because some compilers refuse to overwrite an existing
 # `.o' file with `-o', although they will create one.
@@ -899,8 +898,8 @@ fi
 rm -f conftest*])
 if test $ac_cv_prog_cxx_c_o = no; then
   AC_DEFINE(CXX_NO_MINUS_C_MINUS_O, 1,
-            [Define to 1 if your C++ compiler doesn't accept
-             -c and -o together.])
+           [Define to 1 if your C++ compiler doesn't accept
+            -c and -o together.])
 fi
 AC_LANG_POP([C++])dnl
 ])# AC_PROG_CXX_C_O
@@ -1343,7 +1342,7 @@ AC_DEFUN([AC_PROG_CC_STDC],
   AS_CASE([$ac_cv_prog_cc_stdc],
     [no], [AC_MSG_RESULT([unsupported])],
     [''], [AC_MSG_RESULT([none needed])],
-          [AC_MSG_RESULT([$ac_cv_prog_cc_stdc])])
+         [AC_MSG_RESULT([$ac_cv_prog_cc_stdc])])
 ])
 
 
@@ -1536,10 +1535,10 @@ dnl the user did not specify a config header but is 
relying on the
 dnl default behavior for universal builds.
      m4_default([$4],
        [AC_CONFIG_COMMANDS_PRE([m4_ifset([AH_HEADER], [],
-         [AC_DIAGNOSE([obsolete],
-           [AC_C_BIGENDIAN should be used with AC_CONFIG_HEADERS])])])dnl
-        AC_DEFINE([AC_APPLE_UNIVERSAL_BUILD],1,
-          [Define if building universal (internal helper macro)])])
+        [AC_DIAGNOSE([obsolete],
+          [AC_C_BIGENDIAN should be used with AC_CONFIG_HEADERS])])])dnl
+       AC_DEFINE([AC_APPLE_UNIVERSAL_BUILD],1,
+         [Define if building universal (internal helper macro)])])
      ;; #(
    *)
      m4_default([$3],
@@ -1950,9 +1949,9 @@ AC_DEFUN([AC_OPENMP],
          done])])
     case $ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp in #(
       "none needed" | unsupported)
-        ;; #(
+       ;; #(
       *)
-        OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp 
;;
+       OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ac_cv_prog_[]_AC_LANG_ABBREV[]_openmp 
;;
     esac
   fi
   AC_SUBST([OPENMP_]_AC_LANG_PREFIX[FLAGS])
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index f478ccc..0bc9299 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -61,18 +61,34 @@
 ## 1. Generic tests for functions.  ##
 ## -------------------------------- ##
 
+# _AC_CHECK_FUNC_BODY
+# -------------------
+# Shell function body for AC_CHECK_FUNC.
+m4_define([_AC_CHECK_FUNC_BODY],
+[  AS_LINENO_PUSH([$[]1])
+  AC_CACHE_CHECK([for $[]2], [$[]3],
+  [AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY($[]2)],
+                 [AS_VAR_SET([$[]3], [yes])],
+                 [AS_VAR_SET([$[]3], [no])])])
+  AS_LINENO_POP
+])# _AC_CHECK_FUNC_BODY
+
 
 # AC_CHECK_FUNC(FUNCTION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
 # -----------------------------------------------------------------
+# Check whether FUNCTION links in the current language.  Set the cache
+# variable ac_cv_func_FUNCTION accordingly, then execute
+# ACTION-IF-FOUND or ACTION-IF-NOT-FOUND.
 AC_DEFUN([AC_CHECK_FUNC],
-[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$1])dnl
-AC_CACHE_CHECK([for $1], [ac_var],
-[AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([$1])],
-               [AS_VAR_SET([ac_var], [yes])],
-               [AS_VAR_SET([ac_var], [no])])])
+[AC_REQUIRE_SHELL_FN([ac_func_]_AC_LANG_ABBREV[_check_func],
+  [AS_FUNCTION_DESCRIBE([ac_func_]_AC_LANG_ABBREV[_check_func],
+    [LINENO FUNC VAR],
+    [Tests whether FUNC exists, setting the cache variable VAR accordingly])],
+  [_$0_BODY])]dnl
+[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$1])]dnl
+[ac_func_[]_AC_LANG_ABBREV[]_check_func "$LINENO" "$1" "ac_var"
 AS_VAR_IF([ac_var], [yes], [$2], [$3])
-AS_VAR_POPDEF([ac_var])dnl
-])# AC_CHECK_FUNC
+AS_VAR_POPDEF([ac_var])])# AC_CHECK_FUNC
 
 
 # _AH_CHECK_FUNCS(FUNCTION...)


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