[SCM] GNU Autoconf source repository branch, master, updated. v2.65-40-g534a64a

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 534a64aef36c3d8e08febfdd2a625f122de3764b
Author: Eric Blake <address@hidden>
Date:   Thu Feb 25 14:56:34 2010 -0700

    Document how to safely override CFLAGS default.
    
    * doc/autoconf.texi (C Compiler) <AC_PROG_CC>: Document a way to
    change the default CFLAGS.
    (C++ Compiler) <AC_PROG_CXX>: Likewise, for CXXFLAGS.
    Reported by Monty Taylor; wording suggested by Paolo Bonzini.
    
    Signed-off-by: Eric Blake <address@hidden>

commit 41ec811b56c743df922240de92b308973e161e37
Author: Eric Blake <address@hidden>
Date:   Thu Feb 25 14:06:38 2010 -0700

    Document that Autoconf relies on IFS.
    
    * doc/autoconf.texi (Special Shell Variables) <IFS>: Add details
    about use of IFS within configure script.
    * THANKS: Update.
    Reported by Arkadiusz Miskiewicz.
    
    Signed-off-by: Eric Blake <address@hidden>

commit 4a8168ae1ededcb9abd35cf09aaa35efa069d324
Author: Eric Blake <address@hidden>
Date:   Thu Feb 25 14:17:31 2010 -0700

    Recommend latest m4 release.
    
    * README: Bump recommendation to m4 1.4.14 (minimum remains
    1.4.6).
    * doc/autoconf.texi (Introduction): Likewise.
    * m4/m4.m4 (AC_PROG_GNU_M4): Likewise.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |   20 ++++++++++++++++++++
 README            |    2 +-
 THANKS            |    1 +
 doc/autoconf.texi |   21 ++++++++++++++++-----
 m4/m4.m4          |    4 ++--
 5 files changed, 40 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index ebb686c..bb24886 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,23 @@
+2010-02-26  Eric Blake  <address@hidden>
+
+       Document how to safely override CFLAGS default.
+       * doc/autoconf.texi (C Compiler) <AC_PROG_CC>: Document a way to
+       change the default CFLAGS.
+       (C++ Compiler) <AC_PROG_CXX>: Likewise, for CXXFLAGS.
+       Reported by Monty Taylor; wording suggested by Paolo Bonzini.
+
+       Document that Autoconf relies on IFS.
+       * doc/autoconf.texi (Special Shell Variables) <IFS>: Add details
+       about use of IFS within configure script.
+       * THANKS: Update.
+       Reported by Arkadiusz Miskiewicz.
+
+       Recommend latest m4 release.
+       * README: Bump recommendation to m4 1.4.14 (minimum remains
+       1.4.6).
+       * doc/autoconf.texi (Introduction): Likewise.
+       * m4/m4.m4 (AC_PROG_GNU_M4): Likewise.
+
 2010-02-23  Ralf Wildenhues  <address@hidden>
 
        Fix testsuite failures due to setting of $U.
diff --git a/README b/README
index fd5591b..7b67372 100644
--- a/README
+++ b/README
@@ -12,7 +12,7 @@ macro calls.
 
 Producing configuration scripts using Autoconf requires GNU M4 and
 Perl.  You should install GNU M4 (version 1.4.6 or later is required;
-1.4.13 or later is recommended) and Perl (5.005_03 or later) before
+1.4.14 or later is recommended) and Perl (5.005_03 or later) before
 configuring Autoconf, so that Autoconf's configure script can find
 them.  The configuration scripts produced by Autoconf are
 self-contained, so their users do not need to have Autoconf (or GNU
diff --git a/THANKS b/THANKS
index 8f90e90..16dd8a3 100644
--- a/THANKS
+++ b/THANKS
@@ -38,6 +38,7 @@ Andrew Church               address@hidden
 Andrey Simonenko            address@hidden
 Andris Pavenis              address@hidden
 Anthony N. Frasso           address@hidden
+Arkadiusz Miskiewicz        address@hidden
 Art Haas                    address@hidden
 Arto C. Nirkko              ?
 Artur Frysiak               address@hidden
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index e5cf9fd..3dfeda2 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -750,7 +750,7 @@ Autoconf imposes some restrictions on the names of macros 
used with
 Autoconf requires @acronym{GNU} M4 version 1.4.6 or later in order to
 generate the scripts.  It uses features that some versions of M4,
 including @acronym{GNU} M4 1.3, do not have.  Autoconf works better
-with @acronym{GNU} M4 version 1.4.13 or later, though this is not
+with @acronym{GNU} M4 version 1.4.14 or later, though this is not
 required.
 
 @xref{Autoconf 1}, for information about upgrading from version 1.
@@ -7128,7 +7128,9 @@ If using the @acronym{GNU} C compiler, set shell variable 
@code{GCC} to
 @samp{yes}.  If output variable @code{CFLAGS} was not already set, set
 it to @option{-g -O2} for the @acronym{GNU} C compiler (@option{-O2} on systems
 where @acronym{GCC} does not accept @option{-g}), or @option{-g} for
-other compilers.
+other compilers.  If your package does not like this default, then it is
+acceptable to insert the line @samp{: address@hidden""@}} after @code{AC_INIT}
+and before @code{AC_PROG_CC} to select an empty default instead.
 
 Many Autoconf macros use a compiler, and thus call
 @samp{AC_REQUIRE([AC_PROG_CC])} to ensure that the compiler has been
@@ -7529,7 +7531,10 @@ If using the @acronym{GNU} C++ compiler, set shell 
variable @code{GXX} to
 @samp{yes}.  If output variable @code{CXXFLAGS} was not already set, set
 it to @option{-g -O2} for the @acronym{GNU} C++ compiler (@option{-O2} on
 systems where G++ does not accept @option{-g}), or @option{-g} for other
-compilers.
+compilers.  If your package does not like this default, then it is
+acceptable to insert the line @samp{: address@hidden""@}} after @code{AC_INIT}
+and before @code{AC_PROG_CXX} to select an empty default instead.
+
 @end defmac
 
 @defmac AC_PROG_CXXCPP
@@ -15715,18 +15720,24 @@ Long ago, shell scripts inherited @env{IFS} from the 
environment,
 but this caused many problems so modern shells ignore any environment
 settings for @env{IFS}.
 
-Don't set the first character of @code{IFS} to backslash.  Indeed,
+Don't set the first character of @env{IFS} to backslash.  Indeed,
 Bourne shells use the first character (backslash) when joining the
 components in @samp{"$@@"} and some shells then reinterpret (!)@: the
 backslash escapes, so you can end up with backspace and other strange
 characters.
 
-The proper value for @code{IFS} (in regular code, not when performing
+The proper value for @env{IFS} (in regular code, not when performing
 splits) is @address@hidden@address@hidden  The first character is
 especially important, as it is used to join the arguments in @samp{$*};
 however, note that traditional shells, but also bash-2.04, fail to adhere
 to this and join with a space anyway.
 
+M4sh guarantees that @env{IFS} will have the default value at the
+beginning of a script, and many macros within autoconf rely on this
+setting.  It is okay to use blocks of shell code that temporarily change
+the value of @env{IFS} in order to split on another character, but
+remember to restore it before expanding further macros.
+
 @item LANG
 @itemx LC_ALL
 @itemx LC_COLLATE
diff --git a/m4/m4.m4 b/m4/m4.m4
index a512736..4a2d0d1 100644
--- a/m4/m4.m4
+++ b/m4/m4.m4
@@ -1,4 +1,4 @@
-# m4.m4 serial 10
+# m4.m4 serial 11
 
 # Copyright (C) 2000, 2006, 2007, 2008, 2009, 2010 Free Software
 # Foundation, Inc.
@@ -34,7 +34,7 @@ AC_PATH_PROGS_FEATURE_CHECK([M4], [m4 gm4 gnum4],
       && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
       rm -f conftest.m4f],
       [AC_MSG_ERROR([no acceptable m4 could be found in \$PATH.
-GNU M4 1.4.6 or later is required; 1.4.13 is recommended])])])
+GNU M4 1.4.6 or later is required; 1.4.14 is recommended])])])
   M4=$ac_cv_path_M4
   AC_CACHE_CHECK([whether $ac_cv_path_M4 accepts --gnu],
     [ac_cv_prog_gnu_m4_gnu],


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