[SCM] GNU Autoconf source repository branch, master, updated. v2.69-37-gb9dc6b6

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit b9dc6b6e9c4e3a8b6ee88b2969c237b729708e67
Author: Paul Eggert <address@hidden>
Date:   Tue Oct 16 13:32:31 2012 -0700

    AC_PROG_CC_C89, AC_PROG_CC_C99, AC_PROG_CC_STDC: Use AU_ALIAS.
    
    Based on a suggestion by Adrian Bunk in
    http://lists.gnu.org/archive/html/autoconf-patches/2012-09/msg00040.html
    * lib/autoconf/c.m4 (AC_PROG_CC_C89, AC_PROG_CC_C99, AC_PROG_CC_STDC):
    Use AU_ALIAS, now that AC_PROG_CC is defined via AC_DEFUN_ONCE.

commit 18c140b50b0619454d4da50d58a318cc257d580a
Author: Paul Eggert <address@hidden>
Date:   Tue Oct 16 13:20:58 2012 -0700

    AC_PROG_CC: define via AC_DEFUN_ONCE
    
    Suggested by Adrian Bunk in
    http://lists.gnu.org/archive/html/autoconf-patches/2012-09/msg00034.html
    * NEWS:
    * doc/autoconf.texi (C Compiler): Document it
    * lib/autoconf/c.m4 (AC_PROG_CC): Implement it.

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

Summary of changes:
 NEWS              |    2 ++
 doc/autoconf.texi |    7 ++-----
 lib/autoconf/c.m4 |   17 ++++-------------
 3 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/NEWS b/NEWS
index 8b35cb8..d3ff4b9 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,8 @@ GNU Autoconf NEWS - User visible changes.
 - AC_PROG_CC now prefers C11 if available, falling back on C99 and
   then on C89 as before.
 
+- AC_PROG_CC is now defined via AC_DEFUN_ONCE, to avoid bloat in 'configure'.
+
 - AC_PROG_CC_STDC, AC_PROG_CC_C89, AC_PROG_CC_C99 have been marked as obsolete.
   Applications should use AC_PROG_CC.
 
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index e0666d4..a0c19d1 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -7280,11 +7280,8 @@ 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
 determined before the body of the outermost @code{AC_DEFUN} macro.
-Although @code{AC_PROG_CC} is safe to directly expand multiple times, it
-performs certain checks (such as the proper value of @env{EXEEXT}) only
-on the first invocation.  Therefore, care must be used when invoking
-this macro from within another macro rather than at the top level
-(@pxref{Expanded Before Required}).
address@hidden is therefore defined via @code{AC_DEFUN_ONCE} to avoid
+needless reexpansion (@pxref{One-Shot Macros}).
 @end defmac
 
 @anchor{AC_PROG_CC_C_O}
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index ad40527..4a84489 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -432,7 +432,7 @@ AU_DEFUN([ac_cv_prog_gcc],
 AN_MAKEVAR([CC],  [AC_PROG_CC])
 AN_PROGRAM([cc],  [AC_PROG_CC])
 AN_PROGRAM([gcc], [AC_PROG_CC])
-AC_DEFUN([AC_PROG_CC],
+AC_DEFUN_ONCE([AC_PROG_CC],
 [AC_LANG_PUSH(C)dnl
 AC_ARG_VAR([CC],     [C compiler command])dnl
 AC_ARG_VAR([CFLAGS], [C compiler flags])dnl
@@ -1448,24 +1448,15 @@ dnl preferably extc11.
 
 # AC_PROG_CC_C89
 # --------------
-AC_DEFUN([AC_PROG_CC_C89],
-[ AC_REQUIRE([AC_PROG_CC])dnl
-  m4_warn([obsolete], [$0 is obsolete; use AC_PROG_CC])
-])
+AU_ALIAS([AC_PROG_CC_C89], [AC_PROG_CC])
 
 # AC_PROG_CC_C99
 # --------------
-AC_DEFUN([AC_PROG_CC_C99],
-[ AC_REQUIRE([AC_PROG_CC])dnl
-  m4_warn([obsolete], [$0 is obsolete; use AC_PROG_CC])
-])
+AU_ALIAS([AC_PROG_CC_C99], [AC_PROG_CC])
 
 # AC_PROG_CC_STDC
 # ---------------
-AC_DEFUN([AC_PROG_CC_STDC],
-[ AC_REQUIRE([AC_PROG_CC])dnl
-  m4_warn([obsolete], [$0 is obsolete; use AC_PROG_CC])
-])
+AU_ALIAS([AC_PROG_CC_STDC], [AC_PROG_CC])
 
 
 # AC_C_BACKSLASH_A


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