Merge in prereq-1.2

.hgignore

@@ -0,0 +1,7 @@
+configure$
+Makefile.in
+aclocal.m4
+config.guess
+config.sub
+install-sh
+missing

Makefile.am

@@ -0,0 +1,13 @@
+ACLOCAL_AMFLAGS = -I m4
+GCC=@GCC@
+MAKE=@MAKE@
+M4=@M4@
+PERL=@PERL@
+PERL1=@PERL1@
+RANLIB=@RANLIB@
+TAR=@TAR@
+SH=@SH@
+
+
+#bin_PROGRAMS=zzz
+#zzz_SOURCES=zzz.c

m4/ax_c_check_flag.m4

@@ -0,0 +1,85 @@
+# ===========================================================================
+#         http://www.nongnu.org/autoconf-archive/ax_c_check_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_C_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
+#
+# DESCRIPTION
+#
+#   This macro tests if the C compiler supports the flag FLAG-TO-CHECK. If
+#   successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.
+#   PROLOGUE and BODY are optional and should be used as in AC_LANG_PROGRAM
+#   macro.
+#
+#   This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to
+#   Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
+#
+#   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, see <http://www.gnu.org/licenses/>.
+#
+#   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 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_C_CHECK_FLAG],[
+  AC_PREREQ([2.61])
+  AC_REQUIRE([AC_PROG_CC])
+  AC_REQUIRE([AC_PROG_SED])
+
+  flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'`
+
+  AC_CACHE_CHECK([whether the C compiler accepts the $1 flag],
+    [ax_cv_c_check_flag_$flag],[
+
+    AC_LANG_PUSH([C])
+
+    save_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS $1"
+    AC_COMPILE_IFELSE([
+      AC_LANG_PROGRAM([$2],[$3])
+    ],[
+      eval "ax_cv_c_check_flag_$flag=yes"
+    ],[
+      eval "ax_cv_c_check_flag_$flag=no"
+    ])
+
+    CFLAGS="$save_CFLAGS"
+
+    AC_LANG_POP
+
+  ])
+
+  AS_IF([eval "test \"`echo '$ax_cv_c_check_flag_'$flag`\" = yes"],[
+    :
+    $4
+  ],[
+    :
+    $5
+  ])
+])
+

m4/ax_gcc_option.m4

@@ -0,0 +1,126 @@
+# ===========================================================================
+#          http://www.nongnu.org/autoconf-archive/ax_gcc_option.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)
+#
+# DESCRIPTION
+#
+#   AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts
+#   the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise
+#   ACTION-IF-UNSUCCESSFUL.
+#
+#   NOTE: This macro will be obsoleted by AX_C_CHECK_FLAG AX_CXX_CHECK_FLAG,
+#   AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.
+#
+#   A typical usage should be the following one:
+#
+#     AX_GCC_OPTION([-fomit-frame-pointer],[],[],[
+#       AC_MSG_NOTICE([The option is supported])],[
+#       AC_MSG_NOTICE([No luck this time])
+#     ])
+#
+#   The macro doesn't discriminate between languages so, if you are testing
+#   for an option that works for C++ but not for C you should use '-x c++'
+#   as EXTRA-OPTIONS:
+#
+#     AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])
+#
+#   OPTION is tested against the following code:
+#
+#     int main()
+#     {
+#             return 0;
+#     }
+#
+#   The optional TEST-PROGRAM comes handy when the default main() is not
+#   suited for the option being checked
+#
+#   So, if you need to test for -fstrict-prototypes option you should
+#   probably use the macro as follows:
+#
+#     AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[
+#       int main(int argc, char ** argv)
+#       {
+#       	(void) argc;
+#       	(void) argv;
+#
+#       	return 0;
+#       }
+#     ],[ ... ],[ ... ])
+#
+#   Note that the macro compiles but doesn't link the test program so it is
+#   not suited for checking options that are passed to the linker, like:
+#
+#     -Wl,-L<a-library-path>
+#
+#   In order to avoid such kind of problems you should think about usinguse
+#   the AX_*_CHECK_FLAG family macros
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
+#   Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>
+#
+#   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, see <http://www.gnu.org/licenses/>.
+#
+#   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 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_GCC_OPTION], [
+  AC_REQUIRE([AC_PROG_CC])
+
+  AC_MSG_CHECKING([if gcc accepts $1 option])
+
+  AS_IF([ test "x$GCC" = "xyes" ],[
+    AS_IF([ test -z "$3" ],[
+      ax_gcc_option_test="int main()
+{
+	return 0;
+}"
+    ],[
+      ax_gcc_option_test="$3"
+    ])
+
+    # Dump the test program to file
+    cat <<EOF > conftest.c
+$ax_gcc_option_test
+EOF
+
+    # Dump back the file to the log, useful for debugging purposes
+    AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD)
+
+    AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[
+   	        AC_MSG_RESULT([yes])
+    	$4
+    ],[
+   		AC_MSG_RESULT([no])
+    	$5
+    ])
+  ],[
+    AC_MSG_RESULT([no gcc available])
+  ])
+])

m4/ax_gcc_version.m4

@@ -0,0 +1,63 @@
+# ===========================================================================
+#         http://www.nongnu.org/autoconf-archive/ax_gcc_version.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_GCC_VERSION
+#
+# DESCRIPTION
+#
+#   This macro retrieves the gcc version and returns it in the GCC_VERSION
+#   variable if available, an empty string otherwise.
+#
+# LICENSE
+#
+#   Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
+#
+#   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, see <http://www.gnu.org/licenses/>.
+#
+#   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 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_GCC_VERSION], [
+  GCC_VERSION=""
+  AX_GCC_OPTION([-dumpversion],[],[],[
+    ax_gcc_version_option=yes
+  ],[
+    ax_gcc_version_option=no
+  ])
+  AS_IF([test "x$GCC" = "xyes"],[
+    AS_IF([test "x$ax_gcc_version_option" != "xno"],[
+      AC_CACHE_CHECK([gcc version],[ax_cv_gcc_version],[
+        ax_cv_gcc_version="`$CC -dumpversion`"
+        AS_IF([test "x$ax_cv_gcc_version" = "x"],[
+          ax_cv_gcc_version=""
+        ])
+      ])
+      GCC_VERSION=$ax_cv_gcc_version
+    ])
+  ])
+  AC_SUBST([GCC_VERSION])
+])