[SCM] GNU Autoconf source repository branch, master, updated. v2.69-78-g4276166

[Paul Eggert]

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU Autoconf source repository".

http://git.sv.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=42761668c0300afa7f8bf5ba736458a818cd5d15

The branch, master has been updated
       via  42761668c0300afa7f8bf5ba736458a818cd5d15 (commit)
      from  845e703afd505f1f5ca7649fc1730258573e0f3a (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
commit 42761668c0300afa7f8bf5ba736458a818cd5d15
Author: Akim Demaille <address@hidden>
Date:   Tue Mar 19 11:19:17 2013 -0700

    AC_PROG_YACC: don't force Bison to warn against its own features
    
    When invoked with -y/--yacc, Bison warns when its extensions over
    POSIX Yacc are used.  Yet many packages requiring GNU Bison use
    Autoconf/Automake's Yacc support, which passes -y to Bison.  It
    turns out that passing '-o y.tab.c' has exactly the desired
    effect: generating not only y.tab.c but also y.tab.h with -d and
    y.output with -v.  See:
    http://lists.gnu.org/archive/html/bison-patches/2013-02/msg00100.html
    * lib/autoconf/programs.m4 (AC_PROG_YACC): Use bison -o y.tab.c.
    * NEWS, doc/autoconf.texi: Document this change.

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

Summary of changes:
 NEWS                     |    4 ++++
 doc/autoconf.texi        |    2 +-
 lib/autoconf/programs.m4 |    4 ++--
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/NEWS b/NEWS
index 1780cb9..de9d915 100644
--- a/NEWS
+++ b/NEWS
@@ -33,6 +33,10 @@ GNU Autoconf NEWS - User visible changes.
 - AC_PROG_CC_STDC, AC_PROG_CC_C89, AC_PROG_CC_C99 have been marked as obsolete.
   Applications should use AC_PROG_CC.
 
+- AC_PROG_YACC now uses 'bison -o y.tab.c' instead of 'bison -y', so that
+  by default it no longer warns about Bison extensions.  Add -Wyacc to
+  YFLAGS to enable these warnings.
+
 - AC_USE_SYSTEM_EXTENSIONS now enables more system extensions on HP-UX,
   MINIX 3, and OS X.
 
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index c54c5b3..f895e47 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4222,7 +4222,7 @@ and is cached in the @code{ac_cv_path_SED} variable.
 @ovindex YACC
 @caindex prog_YACC
 If @code{bison} is found, set output variable @code{YACC} to @samp{bison
--y}.  Otherwise, if @code{byacc} is found, set @code{YACC} to
+-o y.tab.c}.  Otherwise, if @code{byacc} is found, set @code{YACC} to
 @samp{byacc}.  Otherwise set @code{YACC} to @samp{yacc}.
 The result of this test can be influenced by setting the variable
 @code{YACC} or the cache variable @code{ac_cv_prog_YACC}.
diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index f7af8b5..2057e78 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -892,10 +892,10 @@ AN_PROGRAM([yacc],  [AC_PROG_YACC])
 AN_PROGRAM([byacc], [AC_PROG_YACC])
 AN_PROGRAM([bison], [AC_PROG_YACC])
 AC_DEFUN([AC_PROG_YACC],
-[AC_CHECK_PROGS(YACC, 'bison -y' byacc, yacc)dnl
+[AC_CHECK_PROGS(YACC, 'bison -o y.tab.c' byacc, yacc)dnl
 AC_ARG_VAR(YACC,
 [The `Yet Another Compiler Compiler' implementation to use.  Defaults to
-the first program found out of: `bison -y', `byacc', `yacc'.])dnl
+the first program found out of: `bison -o y.tab.c', `byacc', `yacc'.])dnl
 AC_ARG_VAR(YFLAGS,
 [The list of arguments that will be passed by default to $YACC.  This script
 will default YFLAGS to the empty string to avoid a default value of `-d' given


hooks/post-receive
-- 
GNU Autoconf source repository