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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CFLAGS_WARN_ALL [(shellvar[, default[, action-if-found[, action-if-not-found]]])]
# AX_CXXFLAGS_WARN_ALL [(shellvar[, default[, action-if-found[, action-if-not-found]]])]
# AX_FCFLAGS_WARN_ALL [(shellvar[, default[, action-if-found[, action-if-not-found]]])]
#
# DESCRIPTION
#
# Specify compiler options that enable most reasonable warnings. For the
# GNU Compiler Collection (GCC), for example, it will be "-Wall". The
# result is added to shellvar, one of CFLAGS, CXXFLAGS or FCFLAGS if the
# first parameter is not specified.
#
# Each of these macros accepts the following optional arguments:
#
# - $1 - shellvar
# shell variable to use (CFLAGS, CXXFLAGS or FCFLAGS if not
# specified, depending on macro)
#
# - $2 - default
# value to use for flags if compiler vendor cannot be determined (by
# default, "")
#
# - $3 - action-if-found
# action to take if the compiler vendor has been successfully
# determined (by default, add the appropriate compiler flags to
# shellvar)
#
# - $4 - action-if-not-found
# action to take if the compiler vendor has not been determined or
# is unknown (by default, add the default flags, or "" if not
# specified, to shellvar)
#
# These macros use AX_COMPILER_VENDOR to determine which flags should be
# returned for a given compiler. Not all compilers currently have flags
# defined for them; patches are welcome. If need be, compiler flags may
# be made language-dependent: use a construct like the following:
#
# [vendor_name], [m4_if(_AC_LANG_PREFIX,[C], VAR="--relevant-c-flags",dnl
# m4_if(_AC_LANG_PREFIX,[CXX], VAR="--relevant-c++-flags",dnl
# m4_if(_AC_LANG_PREFIX,[FC], VAR="--relevant-fortran-flags",dnl
# VAR="$2"; FOUND="no")))],
#
# Note: These macros also depend on AX_PREPEND_FLAG.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2010 Rhys Ulerich <rhys.ulerich@gmail.com>
# Copyright (c) 2018 John Zaitseff <J.Zaitseff@zap.org.au>
#
# 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 25
AC_DEFUN([AX_FLAGS_WARN_ALL], [
AX_REQUIRE_DEFINED([AX_PREPEND_FLAG])dnl
AC_REQUIRE([AX_COMPILER_VENDOR])dnl
AS_VAR_PUSHDEF([FLAGS], [m4_default($1,_AC_LANG_PREFIX[]FLAGS)])dnl
AS_VAR_PUSHDEF([VAR], [ac_cv_[]_AC_LANG_ABBREV[]flags_warn_all])dnl
AS_VAR_PUSHDEF([FOUND], [ac_save_[]_AC_LANG_ABBREV[]flags_warn_all_found])dnl
AC_CACHE_CHECK([FLAGS for most reasonable warnings], VAR, [
VAR=""
FOUND="yes"
dnl Cases are listed in the order found in ax_compiler_vendor.m4
AS_CASE("$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor",
[intel], [VAR="-w2"],
[ibm], [VAR="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd"],
[pathscale], [],
[clang], [VAR="-Wall"],
[cray], [VAR="-h msglevel 2"],
[fujitsu], [],
[sdcc], [],
[sx], [VAR="-pvctl[,]fullmsg"],
[portland], [],
[gnu], [VAR="-Wall"],
[sun], [VAR="-v"],
[hp], [VAR="+w1"],
[dec], [VAR="-verbose -w0 -warnprotos"],
[borland], [],
[comeau], [],
[kai], [],
[lcc], [],
[sgi], [VAR="-fullwarn"],
[microsoft], [],
[metrowerks], [],
[watcom], [],
[tcc], [],
[unknown], [
VAR="$2"
FOUND="no"
],
[
AC_MSG_WARN([Unknown compiler vendor returned by [AX_COMPILER_VENDOR]])
VAR="$2"
FOUND="no"
]
)
AS_IF([test "x$FOUND" = "xyes"], [dnl
m4_default($3, [AS_IF([test "x$VAR" != "x"], [AX_PREPEND_FLAG([$VAR], [FLAGS])])])
], [dnl
m4_default($4, [m4_ifval($2, [AX_PREPEND_FLAG([$VAR], [FLAGS])], [true])])
])dnl
])dnl
AS_VAR_POPDEF([FOUND])dnl
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])dnl AX_FLAGS_WARN_ALL
AC_DEFUN([AX_CFLAGS_WARN_ALL], [dnl
AC_LANG_PUSH([C])
AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
AC_LANG_POP([C])
])dnl
AC_DEFUN([AX_CXXFLAGS_WARN_ALL], [dnl
AC_LANG_PUSH([C++])
AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
AC_LANG_POP([C++])
])dnl
AC_DEFUN([AX_FCFLAGS_WARN_ALL], [dnl
AC_LANG_PUSH([Fortran])
AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
AC_LANG_POP([Fortran])
])dnl
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