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-# ===========================================================================
-# https://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_CFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
-# AX_CXXFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
-# AX_FCFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
-#
-# DESCRIPTION
-#
-# Try to find a compiler option that enables most reasonable warnings.
-#
-# For the GNU compiler it will be -Wall (and -ansi -pedantic) The result
-# is added to the shellvar being CFLAGS, CXXFLAGS, or FCFLAGS by default.
-#
-# Currently this macro knows about the GCC, Solaris, Digital Unix, AIX,
-# HP-UX, IRIX, NEC SX-5 (Super-UX 10), Cray J90 (Unicos 10.0.0.8), and
-# Intel compilers. For a given compiler, the Fortran flags are much more
-# experimental than their C equivalents.
-#
-# - $1 shell-variable-to-add-to : CFLAGS, CXXFLAGS, or FCFLAGS
-# - $2 add-value-if-not-found : nothing
-# - $3 action-if-found : add value to shellvariable
-# - $4 action-if-not-found : nothing
-#
-# NOTE: These macros depend on AX_APPEND_FLAG.
-#
-# LICENSE
-#
-# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-# Copyright (c) 2010 Rhys Ulerich <rhys.ulerich@gmail.com>
-#
-# 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 3 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 <https://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.
-
-#serial 16
-
-AC_DEFUN([AX_FLAGS_WARN_ALL],[dnl
-AS_VAR_PUSHDEF([FLAGS],[_AC_LANG_PREFIX[]FLAGS])dnl
-AS_VAR_PUSHDEF([VAR],[ac_cv_[]_AC_LANG_ABBREV[]flags_warn_all])dnl
-AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
-VAR,[VAR="no, unknown"
-ac_save_[]FLAGS="$[]FLAGS"
-for ac_arg dnl
-in "-warn all % -warn all" dnl Intel
- "-pedantic % -Wall" dnl GCC
- "-xstrconst % -v" dnl Solaris C
- "-std1 % -verbose -w0 -warnprotos" dnl Digital Unix
- "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
- "-ansi -ansiE % -fullwarn" dnl IRIX
- "+ESlit % +w1" dnl HP-UX C
- "-Xc % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
- "-h conform % -h msglevel 2" dnl Cray C (Unicos)
- #
-do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM],
- [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
-done
-FLAGS="$ac_save_[]FLAGS"
-])
-AS_VAR_POPDEF([FLAGS])dnl
-AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
-case ".$VAR" in
- .ok|.ok,*) m4_ifvaln($3,$3) ;;
- .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;;
- *) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;;
-esac
-AS_VAR_POPDEF([VAR])dnl
-])dnl AX_FLAGS_WARN_ALL
-dnl implementation tactics:
-dnl the for-argument contains a list of options. The first part of
-dnl these does only exist to detect the compiler - usually it is
-dnl a global option to enable -ansi or -extrawarnings. All other
-dnl compilers will fail about it. That was needed since a lot of
-dnl compilers will give false positives for some option-syntax
-dnl like -Woption or -Xoption as they think of it is a pass-through
-dnl to later compile stages or something. The "%" is used as a
-dnl delimiter. A non-option comment can be given after "%%" marks
-dnl which will be shown but not added to the respective C/CXXFLAGS.
-
-AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
-AC_LANG_PUSH([C])
-AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
-AC_LANG_POP([C])
-])
-
-AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
-AC_LANG_PUSH([C++])
-AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
-AC_LANG_POP([C++])
-])
-
-AC_DEFUN([AX_FCFLAGS_WARN_ALL],[dnl
-AC_LANG_PUSH([Fortran])
-AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
-AC_LANG_POP([Fortran])
-])