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+# ===========================================================================
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+# http://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
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+# ===========================================================================
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+#
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+# SYNOPSIS
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+#
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+# AX_CFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
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+# AX_CXXFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
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+# AX_FCFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
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+#
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+# DESCRIPTION
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+#
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+# Try to find a compiler option that enables most reasonable warnings.
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+#
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+# For the GNU compiler it will be -Wall (and -ansi -pedantic) The result
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+# is added to the shellvar being CFLAGS, CXXFLAGS, or FCFLAGS by default.
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+#
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+# Currently this macro knows about the GCC, Solaris, Digital Unix, AIX,
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+# HP-UX, IRIX, NEC SX-5 (Super-UX 10), Cray J90 (Unicos 10.0.0.8), and
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+# Intel compilers. For a given compiler, the Fortran flags are much more
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+# experimental than their C equivalents.
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+#
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+# - $1 shell-variable-to-add-to : CFLAGS, CXXFLAGS, or FCFLAGS
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+# - $2 add-value-if-not-found : nothing
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+# - $3 action-if-found : add value to shellvariable
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+# - $4 action-if-not-found : nothing
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+#
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+# NOTE: These macros depend on AX_APPEND_FLAG.
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+#
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+# LICENSE
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+#
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+# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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+# Copyright (c) 2010 Rhys Ulerich <rhys.ulerich@gmail.com>
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+#
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+# This program is free software; you can redistribute it and/or modify it
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+# under the terms of the GNU General Public License as published by the
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+# Free Software Foundation; either version 3 of the License, or (at your
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+# option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful, but
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+# WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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+# Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License along
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+# with this program. If not, see <http://www.gnu.org/licenses/>.
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+#
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+# As a special exception, the respective Autoconf Macro's copyright owner
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+# gives unlimited permission to copy, distribute and modify the configure
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+# scripts that are the output of Autoconf when processing the Macro. You
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+# need not follow the terms of the GNU General Public License when using
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+# or distributing such scripts, even though portions of the text of the
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+# Macro appear in them. The GNU General Public License (GPL) does govern
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+# all other use of the material that constitutes the Autoconf Macro.
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+#
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+# This special exception to the GPL applies to versions of the Autoconf
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+# Macro released by the Autoconf Archive. When you make and distribute a
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+# modified version of the Autoconf Macro, you may extend this special
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+# exception to the GPL to apply to your modified version as well.
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+
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+#serial 15
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+
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+AC_DEFUN([AX_FLAGS_WARN_ALL],[dnl
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+AS_VAR_PUSHDEF([FLAGS],[_AC_LANG_PREFIX[]FLAGS])dnl
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+AS_VAR_PUSHDEF([VAR],[ac_cv_[]_AC_LANG_ABBREV[]flags_warn_all])dnl
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+AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
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+VAR,[VAR="no, unknown"
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+ac_save_[]FLAGS="$[]FLAGS"
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+for ac_arg dnl
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+in "-warn all % -warn all" dnl Intel
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+ "-pedantic % -Wall" dnl GCC
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+ "-xstrconst % -v" dnl Solaris C
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+ "-std1 % -verbose -w0 -warnprotos" dnl Digital Unix
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+ "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
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+ "-ansi -ansiE % -fullwarn" dnl IRIX
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+ "+ESlit % +w1" dnl HP-UX C
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+ "-Xc % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
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+ "-h conform % -h msglevel 2" dnl Cray C (Unicos)
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+ #
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+do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
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+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM],
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+ [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
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+done
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+FLAGS="$ac_save_[]FLAGS"
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+])
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+AS_VAR_POPDEF([FLAGS])dnl
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+AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
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+case ".$VAR" in
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+ .ok|.ok,*) m4_ifvaln($3,$3) ;;
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+ .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;;
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+ *) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;;
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+esac
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+AS_VAR_POPDEF([VAR])dnl
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+])dnl AX_FLAGS_WARN_ALL
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+dnl implementation tactics:
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+dnl the for-argument contains a list of options. The first part of
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+dnl these does only exist to detect the compiler - usually it is
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+dnl a global option to enable -ansi or -extrawarnings. All other
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+dnl compilers will fail about it. That was needed since a lot of
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+dnl compilers will give false positives for some option-syntax
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+dnl like -Woption or -Xoption as they think of it is a pass-through
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+dnl to later compile stages or something. The "%" is used as a
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+dnl delimiter. A non-option comment can be given after "%%" marks
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+dnl which will be shown but not added to the respective C/CXXFLAGS.
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+
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+AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
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+AC_LANG_PUSH([C])
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+AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
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+AC_LANG_POP([C])
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+])
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+
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+AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
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+AC_LANG_PUSH([C++])
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+AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
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+AC_LANG_POP([C++])
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+])
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+
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+AC_DEFUN([AX_FCFLAGS_WARN_ALL],[dnl
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+AC_LANG_PUSH([Fortran])
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+AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
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+AC_LANG_POP([Fortran])
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+])
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