Imported http://autoconf-archive.cryp.to/ release 2007-02-14.

1 files changed, 173 insertions, 0 deletions

diff --git a/m4/ax_cflags_strict_prototypes.m4 b/m4/ax_cflags_strict_prototypes.m4
new file mode 100644
index 0000000..dda68b5
--- /dev/null
+++ b/m4/ax_cflags_strict_prototypes.m4
@@ -0,0 +1,173 @@
+##### http://autoconf-archive.cryp.to/ax_cflags_strict_prototypes.html
+#
+# SYNOPSIS
+#
+#   AX_CFLAGS_STRICT_PROTOTYPES [(shellvar [,default, [A/NA]]
+#
+# DESCRIPTION
+#
+#   Try to find a compiler option that requires strict prototypes.
+#
+#   The sanity check is done by looking at sys/signal.h which has a set
+#   of macro-definitions SIG_DFL and SIG_IGN that are cast to the local
+#   signal-handler type. If that signal-handler type is not fully
+#   qualified then the system headers are not seen as strictly
+#   prototype clean.
+#
+#   For the GNU CC compiler it will be -fstrict-prototypes
+#   -Wstrict-prototypes The result is added to the shellvar being
+#   CFLAGS by default.
+#
+#   DEFAULTS:
+#
+#    - $1 shell-variable-to-add-to : CFLAGS
+#    - $2 add-value-if-not-found : nothing
+#    - $3 action-if-found : add value to shellvariable
+#    - $4 action-if-not-found : nothing
+#
+# LAST MODIFICATION
+#
+#   2006-12-12
+#
+# COPYLEFT
+#
+#   Copyright (c) 2006 Guido U. Draheim <guidod@gmx.de>
+#
+#   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 the Free Software Foundation; either version 2 of the
+#   License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#   General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, write to the Free Software
+#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+#   02111-1307, USA.
+#
+#   As a special exception, the respective Autoconf Macro's copyright
+#   owner gives unlimited permission to copy, distribute and modify the
+#   configure scripts that are the output of Autoconf when processing
+#   the Macro. You need not follow the terms of the GNU General Public
+#   License when using or distributing such scripts, even though
+#   portions of the text of the Macro appear in them. The GNU General
+#   Public License (GPL) does govern all other use of the material that
+#   constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the
+#   Autoconf Macro released by the Autoconf Macro Archive. When you
+#   make and distribute a modified version of the Autoconf Macro, you
+#   may extend this special exception to the GPL to apply to your
+#   modified version as well.
+
+AC_DEFUN([AX_CFLAGS_STRICT_PROTOTYPES],[dnl
+AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_strict_prototypes])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for strict prototypes],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_C
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic % -fstrict-prototypes -Wstrict-prototypes" dnl   GCC
+   "-pedantic % -Wstrict-prototypes" dnl try to warn atleast
+   "-pedantic % -Wmissing-prototypes" dnl or another warning
+   "-pedantic % -Werror-implicit-function-declaration" dnl
+   "-pedantic % -Wimplicit-function-declaration" dnl
+   #
+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   AC_TRY_COMPILE([],[return 0;],
+   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
+done
+case ".$VAR" in
+   .|.no|.no,*) ;;
+   *) # sanity check with signal() from sys/signal.h
+    cp config.log config.tmp
+    AC_TRY_COMPILE([#include <signal.h>],[
+    if (signal (SIGINT, SIG_IGN) == SIG_DFL) return 1;
+    if (signal (SIGINT, SIG_IGN) != SIG_DFL) return 2;],
+    dnl the original did use test -n `$CC testprogram.c`
+    [if test `diff config.log config.tmp | grep -i warning | wc -l` != 0
+then if test `diff config.log config.tmp | grep -i warning | wc -l` != 1
+then VAR="no, suppressed, signal.h," ; fi ; fi],
+    [VAR="no, suppressed, signal.h"])
+    rm config.tmp
+  ;;
+esac
+ FLAGS="$ac_save_[]FLAGS"
+ AC_LANG_RESTORE
+])
+case ".$VAR" in
+     .ok|.ok,*) m4_ifvaln($3,$3) ;;
+   .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
+        AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
+                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
+   *) m4_ifvaln($3,$3,[
+   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
+   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
+   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
+                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
+   fi ]) ;;
+esac
+AS_VAR_POPDEF([VAR])dnl
+AS_VAR_POPDEF([FLAGS])dnl
+])
+
+dnl the only difference - the LANG selection... and the default FLAGS
+
+AC_DEFUN([AX_CXXFLAGS_STRICT_PROTOTYPES],[dnl
+AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
+AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_strict_prototypes])dnl
+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for strict prototypes],
+VAR,[VAR="no, unknown"
+ AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ ac_save_[]FLAGS="$[]FLAGS"
+for ac_arg dnl
+in "-pedantic -Werror % -fstrict-prototypes -Wstrict-prototypes" dnl   GCC
+   "-pedantic -Werror % -Wstrict-prototypes" dnl try to warn atleast
+   "-pedantic -Werror % -Wmissing-prototypes" dnl try to warn atleast
+   "-pedantic -Werror % -Werror-implicit-function-declaration" dnl
+   "-pedantic -Werror % -Wimplicit-function-declaration" dnl
+   "-pedantic % -Wstrict-prototypes %% no, unsupported in C++" dnl oops
+   #
+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
+   AC_TRY_COMPILE([],[return 0;],
+   [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
+done
+case ".$VAR" in
+   .|.no|.no,*) ;;
+   *) # sanity check with signal() from sys/signal.h
+    cp config.log config.tmp
+    AC_TRY_COMPILE([#include <signal.h>],[
+    if (signal (SIGINT, SIG_IGN) == SIG_DFL) return 1;
+    if (signal (SIGINT, SIG_IGN) != SIG_DFL) return 2;],
+    dnl the original did use test -n `$CC testprogram.c`
+    [if test `diff config.log config.tmp | grep -i warning | wc -l` != 0
+then if test `diff config.log config.tmp | grep -i warning | wc -l` != 1
+then VAR="no, suppressed, signal.h," ; fi ; fi],
+    [VAR="no, suppressed, signal.h"])
+    rm config.tmp
+  ;;
+esac
+ FLAGS="$ac_save_[]FLAGS"
+ AC_LANG_RESTORE
+])
+case ".$VAR" in
+     .ok|.ok,*) m4_ifvaln($3,$3) ;;
+   .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[
+        AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])
+                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;;
+   *) m4_ifvaln($3,$3,[
+   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
+   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
+   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
+                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
+   fi ]) ;;
+esac
+AS_VAR_POPDEF([VAR])dnl
+AS_VAR_POPDEF([FLAGS])dnl
+])