[SCM] GNU Autoconf source repository branch, master, updated. v2.62-29-g7bedbd5

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 7bedbd5be1009092bc211f50b3f4108b99f9334c
Author: Eric Blake <address@hidden>
Date:   Mon Jun 9 06:25:35 2008 -0600

    Mark AC_TYPE_SIGNAL as obsolete.
    
    * lib/autoconf/types.m4 (AC_TYPE_SIGNAL): Switch to AU_DEFUN.
    * doc/autoconf.texi (Function Portability): Update documentation.
    (Particular Types): Move AC_TYPE_SIGNAL...
    (Obsolete Macros): ...here, and mention why.
    
    Signed-off-by: Eric Blake <address@hidden>

commit 7758a34286265603496c94edfb1e491d13ca6e5d
Author: Eric Blake <address@hidden>
Date:   Mon Jun 9 06:19:17 2008 -0600

    Allow lib64 as a default X library location.
    
    * lib/autoconf/libs.m4 (_AC_PATH_X_XMKMF): Add lib64.
    * NEWS: Mention the change.
    * THANKS: Update.
    Reported by Brad Walker.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog             |   14 +++++++++++
 NEWS                  |    3 ++
 THANKS                |    1 +
 doc/autoconf.texi     |   59 ++++++++++++++++++++++++++++--------------------
 lib/autoconf/libs.m4  |    2 +-
 lib/autoconf/types.m4 |   13 ++++++----
 6 files changed, 61 insertions(+), 31 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 6c16ecc..8288f12 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2008-06-09  Eric Blake  <address@hidden>
+
+       Mark AC_TYPE_SIGNAL as obsolete.
+       * lib/autoconf/types.m4 (AC_TYPE_SIGNAL): Switch to AU_DEFUN.
+       * doc/autoconf.texi (Function Portability): Update documentation.
+       (Particular Types): Move AC_TYPE_SIGNAL...
+       (Obsolete Macros): ...here, and mention why.
+
+       Allow lib64 as a default X library location.
+       * lib/autoconf/libs.m4 (_AC_PATH_X_XMKMF): Add lib64.
+       * NEWS: Mention the change.
+       * THANKS: Update.
+       Reported by Brad Walker.
+
 2008-06-05  Eric Blake  <address@hidden>
 
        Fix regression in AT_KEYWORDS([Macro]), from 2007-10-18.
diff --git a/NEWS b/NEWS
index 8b866ad..7b3dafc 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,9 @@ GNU Autoconf NEWS - User visible changes.
 
 * Major changes in Autoconf 2.62a (2008-??-??)
 
+** AC_PATH_X now includes /lib64 and /usr/lib64 in its list of default
+   library directories.
+
 ** Clients of m4_expand, such as AS_HELP_STRING and AT_SETUP, can now
    handle properly quoted but otherwise unbalanced parentheses (for
    some macros, this fixes a regression in 2.62).
diff --git a/THANKS b/THANKS
index 224cdea..dfc26eb 100644
--- a/THANKS
+++ b/THANKS
@@ -46,6 +46,7 @@ Bob Friesenhahn             address@hidden
 Bob Proulx                  address@hidden
 Bob Rossi                   address@hidden
 Bob Wilson                  address@hidden
+Brad Walker                 address@hidden
 Braden McDaniel             address@hidden
 Bram Moolenaar              address@hidden
 Brian Gough                 address@hidden
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index cef2d3b..43a84bc 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4352,6 +4352,7 @@ NextStep).
 @item @code{signal} handler
 @c @fuindex signal
 @prindex @code{signal}
address@hidden @code{sigaction}
 Normally @code{signal} takes a handler function with a return type of
 @code{void}, but some old systems required @code{int} instead.  Any
 actual @code{int} value returned is not used; this is only a
@@ -4359,8 +4360,12 @@ difference in the function prototype demanded.
 
 All systems we know of in current use return @code{void}.  The
 @code{int} was to support K&R C, where of course @code{void} is not
-available.  @code{AC_TYPE_SIGNAL} (@pxref{Particular Types}) can be
-used to establish the correct type in all cases.
+available.  The obsolete macro @code{AC_TYPE_SIGNAL}
+(@pxref{AC_TYPE_SIGNAL}) can be used to establish the correct type in
+all cases.
+
+In most cases, it is more robust to use @code{sigaction} when it is
+available, rather than @code{signal}.
 
 @item @code{snprintf}
 @c @fuindex snprintf
@@ -6222,28 +6227,6 @@ Define @code{pid_t} to a suitable type, if standard 
headers do not
 define it.
 @end defmac
 
address@hidden
address@hidden AC_TYPE_SIGNAL
address@hidden
address@hidden RETSIGTYPE
address@hidden
-If @file{signal.h} declares @code{signal} as returning a pointer to a
-function returning @code{void}, define @code{RETSIGTYPE} to be
address@hidden; otherwise, define it to be @code{int}.
-
-Define signal handlers as returning type @code{RETSIGTYPE}:
-
address@hidden
address@hidden
-RETSIGTYPE
-hup_handler ()
address@hidden
address@hidden
address@hidden
address@hidden group
address@hidden example
address@hidden defmac
-
 @anchor{AC_TYPE_SIZE_T}
 @defmac AC_TYPE_SIZE_T
 @acindex{TYPE_SIZE_T}
@@ -19220,7 +19203,8 @@ issue.
 
 @defmac AC_RETSIGTYPE
 @acindex{RETSIGTYPE}
-Replaced by @code{AC_TYPE_SIGNAL} (@pxref{AC_TYPE_SIGNAL}).
+Replaced by @code{AC_TYPE_SIGNAL} (@pxref{AC_TYPE_SIGNAL}), which itself
+is obsolete when assuming C89 or better.
 @end defmac
 
 @defmac AC_RSH
@@ -19480,6 +19464,31 @@ AC_RUN_IFELSE(
 @xref{Runtime}.
 @end defmac
 
address@hidden
address@hidden AC_TYPE_SIGNAL
address@hidden
address@hidden RETSIGTYPE
address@hidden
+If @file{signal.h} declares @code{signal} as returning a pointer to a
+function returning @code{void}, define @code{RETSIGTYPE} to be
address@hidden; otherwise, define it to be @code{int}.  These days, it is
+portable to assume C89, and that signal handlers return @code{void},
+without needing to use this macro or @code{RETSIGTYPE}.
+
+When targetting older K&R C, it is possible to define signal handlers as
+returning type @code{RETSIGTYPE}, and omit a return statement:
+
address@hidden
address@hidden
+RETSIGTYPE
+hup_handler ()
address@hidden
address@hidden
address@hidden
address@hidden group
address@hidden example
address@hidden defmac
+
 @defmac AC_UID_T
 @acindex{UID_T}
 Replaced by @code{AC_TYPE_UID_T} (@pxref{AC_TYPE_UID_T}).
diff --git a/lib/autoconf/libs.m4 b/lib/autoconf/libs.m4
index 45bfc6c..429918c 100644
--- a/lib/autoconf/libs.m4
+++ b/lib/autoconf/libs.m4
@@ -217,7 +217,7 @@ _ACEOF
        *) test -f "$ac_im_incroot/X11/Xos.h" && ac_x_includes=$ac_im_incroot;;
     esac
     case $ac_im_usrlibdir in
-       /usr/lib | /lib) ;;
+       /usr/lib | /usr/lib64 | /lib | /lib64) ;;
        *) test -d "$ac_im_usrlibdir" && ac_x_libraries=$ac_im_usrlibdir ;;
     esac
   fi
diff --git a/lib/autoconf/types.m4 b/lib/autoconf/types.m4
index 866bdca..50a489c 100644
--- a/lib/autoconf/types.m4
+++ b/lib/autoconf/types.m4
@@ -1,8 +1,8 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Type related macros: existence, sizeof, and structure members.
 #
-# Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007 Free Software
-# Foundation, Inc.
+# Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008 Free
+# Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -693,8 +693,10 @@ AC_DEFUN([_AC_TYPE_UNSIGNED_INT],
 # AC_TYPE_SIGNAL
 # --------------
 # Note that identifiers starting with SIG are reserved by ANSI C.
-AN_FUNCTION([signal],  [AC_TYPE_SIGNAL])
-AC_DEFUN([AC_TYPE_SIGNAL],
+# C89 requires signal handlers to return void; only K&R returned int;
+# modern code does not need to worry about using this macro (not to
+# mention that sigaction is better than signal).
+AU_DEFUN([AC_TYPE_SIGNAL],
 [AC_CACHE_CHECK([return type of signal handlers], ac_cv_type_signal,
 [AC_COMPILE_IFELSE(
 [AC_LANG_PROGRAM([#include <sys/types.h>
@@ -706,7 +708,8 @@ AC_DEFUN([AC_TYPE_SIGNAL],
 AC_DEFINE_UNQUOTED(RETSIGTYPE, $ac_cv_type_signal,
                   [Define as the return type of signal handlers
                    (`int' or `void').])
-])
+], [your code may safely assume C89 semantics that RETSIGTYPE is void.
+Remove this warning and the `AC_CACHE_CHECK' when you adjust the code.])
 
 
 ## ------------------------ ##


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