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# ==============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_save_flags_with_prefix.html
# ==============================================================================
#
# SYNOPSIS
#
# AX_SAVE_FLAGS_WITH_PREFIX(PREFIX, LIST-OF-FLAGS)
#
# DESCRIPTION
#
# For each flag in LIST-OF-FLAGS, it expands to lower-cased shell variable
# with the prefix holding the flag original value. The saved variables
# can be restored by AX_RESTORE_FLAGS_WITH_PREFIX
#
# As an example: AX_SAVE_FLAGS_WITH_PREFIX([GL], [[CFLAGS],[LIBS]])
# expands to
#
# gl_saved_flag_cflags="$CFLAGS"
# gl_saved_flag_libs="$LIBS"
# CFLAGS="$GL_CFLAGS $CFLAGS"
# LIBS="$GL_LIBS $LIBS"
#
# One common use case is to define a package specific wrapper macro around
# this one, and also setup other variables if needed. For example:
#
# AC_DEFUN([_AX_CHECK_GL_SAVE_FLAGS], [
# AX_SAVE_FLAGS_WITH_PREFIX([GL],[$1])
# AC_LANG_PUSH([C])
# ])
#
# # pushes GL_CFLAGS and GL_LIBS to CFLAGS and LIBS
# # also set the current language to test to C
# _AX_CHECK_GL_SAVE_FLAGS([[CFLAGS],[LIBS]])
#
# LICENSE
#
# Copyright (c) 2016 Felix Chern <idryman@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 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 <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 3
AC_DEFUN([AX_SAVE_FLAGS_WITH_PREFIX],[
m4_ifval([$2], [
_ax_[]m4_tolower($1)_saved_flag_[]m4_tolower(m4_car($2))="$m4_car($2)"
m4_car($2)="$$1_[]m4_car($2) $m4_car($2)"
$0($1, m4_cdr($2))
])])
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