[SCM] GNU Autoconf source repository branch, master, updated. v2.63-167-g359be41

[Paolo Bonzini]

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- Log -----------------------------------------------------------------
commit 359be416a7aa33dc6d65d1c6271925e6dd72b99e
Author: Paolo Bonzini <address@hidden>
Date:   Thu Nov 6 11:42:39 2008 +0100

    Remove three forks per _AC_RUN_LOG_STDERR in the common case.
    
    * lib/autoconf/general.m4 (_AC_RUN_LOG_STDERR): Avoid grep/rm/cat
    sequence when the program's stderr was empty, while providing a
    conftest.err file even in that case.
    (_AC_CACHE_DUMP): Fix mismatched parenthesis.

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

Summary of changes:
 ChangeLog               |    8 ++++++++
 lib/autoconf/general.m4 |   12 +++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 8ba86ef..37e69c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2008-11-06  Paolo Bonzini  <address@hidden>
 
+       Remove three forks per _AC_RUN_LOG_STDERR in the common case.
+       * lib/autoconf/general.m4 (_AC_RUN_LOG_STDERR): Avoid grep/rm/cat
+       sequence when the program's stderr was empty, while providing a
+       conftest.err file even in that case.
+       (_AC_CACHE_DUMP): Fix mismatched parenthesis.
+
+2008-11-06  Paolo Bonzini  <address@hidden>
+
        Change `present but cannot be compiled' behavior to use compiler result.
        * NEWS: Document it.
        * doc/autoconf.texi (Present But Cannot Be Compiled): Document it.
diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index de4de33..4ae4d47 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1929,7 +1929,7 @@ m4_define([_AC_CACHE_DUMP],
   (set) 2>&1 |
     case $as_nl`(ac_space=' '; set) 2>&1` in #(
     *${as_nl}ac_space=\ *)
-      # `set' does not quote correctly, so add quotes (double-quote
+      # `set' does not quote correctly, so add quotes: double-quote
       # substitution turns \\\\ into \\, and sed turns \\ into \).
       sed -n \
        ["s/'/'\\\\''/g;
@@ -2253,11 +2253,13 @@ AC_DEFUN([_AC_RUN_LOG],
 # in AS_IF constructs.
 AC_DEFUN([_AC_RUN_LOG_STDERR],
 [{ { $2; } >&AS_MESSAGE_LOG_FD
-  ($1) 2>conftest.er1
+  ($1) 2>conftest.err
   ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&AS_MESSAGE_LOG_FD
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&AS_MESSAGE_LOG_FD
+    mv -f conftest.er1 conftest.err
+  fi
   _AS_ECHO_LOG([\$? = $ac_status])
   test $ac_status = 0; }])
 


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