[SCM] GNU Autoconf source repository branch, master, updated. v2.63-5-g93d9386

[Ralf Wildenhues]

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- Log -----------------------------------------------------------------
commit 93d9386de9c1320afed43f1337ac5ddb2d2dcbb4
Author: Ralf Wildenhues <address@hidden>
Date:   Sat Sep 13 15:19:25 2008 +0200

    Improve AC_CONFIG_AUX_DIRS a bit.
    
    * lib/autoconf/general.m4 (AC_CONFIG_AUX_DIRS): Improve a bit.
    
    Signed-off-by: Ralf Wildenhues <address@hidden>

commit e55f6569675e4cbb4790bff4a545b1813be99cd2
Author: Ralf Wildenhues <address@hidden>
Date:   Sat Sep 13 15:17:54 2008 +0200

    Mention Solaris sh ':' redirection bug.
    
    * doc/autoconf.texi (File Descriptors): Redirecting ':'
    in a loop causes bogus optimization with Solaris sh.
    
    Signed-off-by: Ralf Wildenhues <address@hidden>

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

Summary of changes:
 ChangeLog               |    8 ++++++++
 doc/autoconf.texi       |   12 ++++++++++++
 lib/autoconf/general.m4 |   22 ++++++++--------------
 3 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 073efda..f01284d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2008-09-13  Ralf Wildenhues  <address@hidden>
+
+       * lib/autoconf/general.m4 (AC_CONFIG_AUX_DIRS): Improve a bit.
+
+       Mention Solaris sh ':' redirection bug.
+       * doc/autoconf.texi (File Descriptors): Redirecting ':'
+       in a loop causes bogus optimization with Solaris sh.
+
 2008-09-10  Eric Blake  <address@hidden>
 
        Avoid testsuite bug when autom4te cache is disabled by user.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 76bf746..2b1d165 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -13003,6 +13003,18 @@ In each case the expected result is of course 
@file{fullness} containing
 @samp{matter} and @file{void} being empty.  However, this bug is
 probably not of practical concern to modern platforms.
 
+Solaris 10 @command{sh} will try to optimize away a @command{:} command
+in a loop after the first iteration, even if it is redirected:
+
address@hidden
+$ @kbd{for i in 1 2 3 ; do : >x$i; done}
+$ @kbd{ls}
+x1
address@hidden example
+
address@hidden
+As a workaround, @command{echo} or @command{eval} can be used.
+
 Don't rely on file descriptors 0, 1, and 2 remaining closed in a
 subsidiary program.  If any of these descriptors is closed, the
 operating system may open an unspecified file for the descriptor in the
diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index c94e048..986b7af 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1650,22 +1650,16 @@ AC_DEFUN([AC_CONFIG_AUX_DIR_DEFAULT],
 AC_DEFUN([AC_CONFIG_AUX_DIRS],
 [ac_aux_dir=
 for ac_dir in $1; do
-  if test -f "$ac_dir/install-sh"; then
-    ac_aux_dir=$ac_dir
-    ac_install_sh="$ac_aux_dir/install-sh -c"
-    break
-  elif test -f "$ac_dir/install.sh"; then
-    ac_aux_dir=$ac_dir
-    ac_install_sh="$ac_aux_dir/install.sh -c"
-    break
-  elif test -f "$ac_dir/shtool"; then
-    ac_aux_dir=$ac_dir
-    ac_install_sh="$ac_aux_dir/shtool install -c"
-    break
-  fi
+  for ac_t in install-sh install.sh shtool; do
+    if test -f "$ac_dir/$ac_t"; then
+      ac_aux_dir=$ac_dir
+      ac_install_sh="$ac_aux_dir/$ac_t -c"
+      break 2
+    fi
+  done
 done
 if test -z "$ac_aux_dir"; then
-  AC_MSG_ERROR([cannot find install-sh or install.sh in $1])
+  AC_MSG_ERROR([cannot find install-sh, install.sh, or shtool in $1])
 fi
 
 # These three variables are undocumented and unsupported,


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