[SCM] GNU Autoconf source repository branch, master, updated. v2.68-34-g46acbee

[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=46acbee4f8cb63d6656d2efd2025e6f99ee77e81

The branch, master has been updated
       via  46acbee4f8cb63d6656d2efd2025e6f99ee77e81 (commit)
      from  ce7ebea4e74d1e152f1ec6e5a44e3b1c0ca9c7a2 (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 46acbee4f8cb63d6656d2efd2025e6f99ee77e81
Author: Paul Eggert <address@hidden>
Date:   Fri Feb 4 20:38:07 2011 -0800

    autoconf: new macro AC_HEADER_CHECK_STDBOOL
    
    * NEWS: Document this.
    * doc/autoconf.texi (Particular Headers): Likewise.
    In example, don't assume a 'system.h' exists.
    * lib/autoconf/headers.m4 (AC_CHECK_HEADER_STDBOOL): New macro.
    Use it with AN_IDENTIFIER, since it's less heavyweight.
    Reindent to match gnulib, since that's a bit nicer.
    (AC_HEADER_STDBOOL): Reimplement in terms of it.

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

Summary of changes:
 ChangeLog               |   11 ++++
 NEWS                    |    3 +
 doc/autoconf.texi       |   33 +++++++++--
 lib/autoconf/headers.m4 |  135 +++++++++++++++++++++++++----------------------
 4 files changed, 113 insertions(+), 69 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b36aab1..6d65401 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2011-02-04  Paul Eggert  <address@hidden>
+
+       autoconf: new macro AC_HEADER_CHECK_STDBOOL
+       * NEWS: Document this.
+       * doc/autoconf.texi (Particular Headers): Likewise.
+       In example, don't assume a 'system.h' exists.
+       * lib/autoconf/headers.m4 (AC_CHECK_HEADER_STDBOOL): New macro.
+       Use it with AN_IDENTIFIER, since it's less heavyweight.
+       Reindent to match gnulib, since that's a bit nicer.
+       (AC_HEADER_STDBOOL): Reimplement in terms of it.
+
 2011-01-29  Jim Warhol  <address@hidden>  (tiny change)
 
        * doc/autoconf.texi (Introduction): Fix typo.
diff --git a/NEWS b/NEWS
index d00c312..c485f22 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,9 @@ GNU Autoconf NEWS - User visible changes.
 ** AS_LITERAL_IF again treats '=' as a literal.  Regression introduced in
    2.66.
 
+** Macros
+
+- New macro AC_HEADER_CHECK_STDBOOL.
 
 * Noteworthy changes in release 2.68 (2010-09-22) [stable]
   Released by Eric Blake, based on git versions 2.67.*.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index b1ccb1a..6ad657e 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -5811,6 +5811,21 @@ AC_CHECK_HEADERS([X11/extensions/scrnsaver.h], [], [],
 These macros check for particular system header files---whether they
 exist, and in some cases whether they declare certain symbols.
 
address@hidden AC_CHECK_HEADER_STDBOOL
address@hidden
address@hidden HAVE__BOOL
address@hidden
address@hidden header_stdbool_h
+Check whether @file{stdbool.h} exists and conforms to C99, and cache the
+result in the @code{ac_cv_header_stdbool_h} variable.  If the type
address@hidden is defined, define @code{HAVE__BOOL} to 1.
+
+This macro is intended for use by Gnulib (@pxref{Gnulib}) and other
+packages that supply a substitute @file{stdbool.h} on platforms lacking
+a conforming one.  The @code{AC_HEADER_STDBOOL} macro is better for code
+that explicitly checks for @file{stdbool.h}.
address@hidden defmac
+
 @defmac AC_HEADER_ASSERT
 @acindex{HEADER_ASSERT}
 @cvindex NDEBUG
@@ -5937,14 +5952,14 @@ New programs need not use this macro.
 @cvindex HAVE_STDBOOL_H
 @cvindex HAVE__BOOL
 @hdrindex{stdbool.h}
address@hidden
 @caindex header_stdbool_h
 If @file{stdbool.h} exists and conforms to C99, define
 @code{HAVE_STDBOOL_H} to 1; if the type @code{_Bool} is defined, define
 @code{HAVE__BOOL} to 1.  To fulfill the C99 requirements, your
address@hidden could contain the following code:
+program could contain the following code:
 
address@hidden
address@hidden
address@hidden
 #ifdef HAVE_STDBOOL_H
 # include <stdbool.h>
 #else
@@ -5960,14 +5975,20 @@ typedef bool _Bool;
 # define true 1
 # define __bool_true_false_are_defined 1
 #endif
address@hidden verbatim
address@hidden group
address@hidden example
 
 Alternatively you can use the @samp{stdbool} package of Gnulib
-(@pxref{Gnulib}); it packages the above code into a replacement header
-and contains a few other bells and whistles.
+(@pxref{Gnulib}).  It simplifies your code so that it can say just
address@hidden <stdbool.h>}, and it adds support for less-common
+platforms.
 
 This macro caches its result in the @code{ac_cv_header_stdbool_h}
 variable.
+
+This macro differs from @code{AC_CHECK_HEADER_STDBOOL} only in that it
+defines @code{HAVE_STDBOOL_H} whereas @code{AC_CHECK_HEADER_STDBOOL}
+does not.
 @end defmac
 
 @anchor{AC_HEADER_STDC}
diff --git a/lib/autoconf/headers.m4 b/lib/autoconf/headers.m4
index 75bdfef..4b02832 100644
--- a/lib/autoconf/headers.m4
+++ b/lib/autoconf/headers.m4
@@ -591,72 +591,81 @@ fi
 ])# AC_HEADER_STAT
 
 
-# AC_HEADER_STDBOOL
+# AC_CHECK_HEADER_STDBOOL
 # -----------------
 # Check for stdbool.h that conforms to C99.
-AN_IDENTIFIER([bool], [AC_HEADER_STDBOOL])
-AN_IDENTIFIER([true], [AC_HEADER_STDBOOL])
-AN_IDENTIFIER([false],[AC_HEADER_STDBOOL])
-AC_DEFUN([AC_HEADER_STDBOOL],
-[AC_CACHE_CHECK([for stdbool.h that conforms to C99],
-   [ac_cv_header_stdbool_h],
-   [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
-      [[
-#include <stdbool.h>
-#ifndef bool
- "error: bool is not defined"
-#endif
-#ifndef false
- "error: false is not defined"
-#endif
-#if false
- "error: false is not 0"
-#endif
-#ifndef true
- "error: true is not defined"
-#endif
-#if true != 1
- "error: true is not 1"
-#endif
-#ifndef __bool_true_false_are_defined
- "error: __bool_true_false_are_defined is not defined"
-#endif
+AN_IDENTIFIER([bool], [AC_CHECK_HEADER_STDBOOL])
+AN_IDENTIFIER([true], [AC_CHECK_HEADER_STDBOOL])
+AN_IDENTIFIER([false],[AC_CHECK_HEADER_STDBOOL])
+AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
+  [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
+     [ac_cv_header_stdbool_h],
+     [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+           [[
+             #include <stdbool.h>
+             #ifndef bool
+              "error: bool is not defined"
+             #endif
+             #ifndef false
+              "error: false is not defined"
+             #endif
+             #if false
+              "error: false is not 0"
+             #endif
+             #ifndef true
+              "error: true is not defined"
+             #endif
+             #if true != 1
+              "error: true is not 1"
+             #endif
+             #ifndef __bool_true_false_are_defined
+              "error: __bool_true_false_are_defined is not defined"
+             #endif
+
+             struct s { _Bool s: 1; _Bool t; } s;
+
+             char a[true == 1 ? 1 : -1];
+             char b[false == 0 ? 1 : -1];
+             char c[__bool_true_false_are_defined == 1 ? 1 : -1];
+             char d[(bool) 0.5 == true ? 1 : -1];
+             /* See body of main program for 'e'.  */
+             char f[(_Bool) 0.0 == false ? 1 : -1];
+             char g[true];
+             char h[sizeof (_Bool)];
+             char i[sizeof s.t];
+             enum { j = false, k = true, l = false * true, m = true * 256 };
+             /* The following fails for
+                HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
+             _Bool n[m];
+             char o[sizeof n == m * sizeof n[0] ? 1 : -1];
+             char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
+             /* Catch a bug in an HP-UX C compiler.  See
+                http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
+                
http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
+              */
+             _Bool q = true;
+             _Bool *pq = &q;
+           ]],
+           [[
+             bool e = &s;
+             *pq |= q;
+             *pq |= ! q;
+             /* Refer to every declared value, to avoid compiler 
optimizations.  */
+             return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + 
!!l
+                     + !m + !n + !o + !p + !q + !pq);
+           ]])],
+        [ac_cv_header_stdbool_h=yes],
+        [ac_cv_header_stdbool_h=no])])
+   AC_CHECK_TYPES([_Bool])
+])# AC_CHECK_HEADER_STDBOOL
+
 
-       struct s { _Bool s: 1; _Bool t; } s;
-
-       char a[true == 1 ? 1 : -1];
-       char b[false == 0 ? 1 : -1];
-       char c[__bool_true_false_are_defined == 1 ? 1 : -1];
-       char d[(bool) 0.5 == true ? 1 : -1];
-       /* See body of main program for 'e'.  */
-       char f[(_Bool) 0.0 == false ? 1 : -1];
-       char g[true];
-       char h[sizeof (_Bool)];
-       char i[sizeof s.t];
-       enum { j = false, k = true, l = false * true, m = true * 256 };
-       /* The following fails for
-          HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
-       _Bool n[m];
-       char o[sizeof n == m * sizeof n[0] ? 1 : -1];
-       char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
-       /* Catch a bug in an HP-UX C compiler.  See
-          http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
-          http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
-        */
-       _Bool q = true;
-       _Bool *pq = &q;
-      ]],
-      [[
-       bool e = &s;
-       *pq |= q;
-       *pq |= ! q;
-       /* Refer to every declared value, to avoid compiler optimizations.  */
-       return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
-               + !m + !n + !o + !p + !q + !pq);
-      ]])],
-      [ac_cv_header_stdbool_h=yes],
-      [ac_cv_header_stdbool_h=no])])
-AC_CHECK_TYPES([_Bool])
+# AC_HEADER_STDBOOL
+# -----------------
+# Define HAVE_STDBOOL_H if tdbool.h that conforms to C99.
+AC_DEFUN([AC_HEADER_STDBOOL],
+[AC_CHECK_HEADER_STDBOOL
 if test $ac_cv_header_stdbool_h = yes; then
   AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
 fi


hooks/post-receive
-- 
GNU Autoconf source repository