Split out CXXFLAGS and DEBUG_CXXFLAGS

scripts/libmakepkg/buildenv.sh.in

@@ -25,7 +25,7 @@ LIBMAKEPKG_BUILDENV_SH=1
 MAKEPKG_LIBRARY=${MAKEPKG_LIBRARY:-'@libmakepkgdir@'}
 
 declare -a buildenv_functions buildenv_vars build_options
-buildenv_vars_exported=('CXXFLAGS' 'LDFLAGS' 'MAKEFLAGS' 'CHOST')
+buildenv_vars_exported=('LDFLAGS' 'MAKEFLAGS' 'CHOST')
 
 for lib in "$MAKEPKG_LIBRARY/buildenv/"*.sh; do
 	source "$lib"

scripts/libmakepkg/buildenv/cxx.sh.in

@@ -0,0 +1,35 @@
+#!/usr/bin/bash
+#
+#   cxx.sh - Specify flags for building a package with C++
+#
+#   Copyright (c) 2024 Pacman Development Team <pacman-dev@lists.archlinux.org>
+#
+#   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/>.
+#
+
+[[ -n "$LIBMAKEPKG_BUILDENV_CXX_SH" ]] && return
+LIBMAKEPKG_BUILDENV_CXX_SH=1
+
+MAKEPKG_LIBRARY=${MAKEPKG_LIBRARY:-'@libmakepkgdir@'}
+
+source "$MAKEPKG_LIBRARY/util/option.sh"
+source "$MAKEPKG_LIBRARY/util/util.sh"
+
+buildenv_vars+=('DEBUG_CXXFLAGS')
+buildenv_vars_exported+=('CXXFLAGS')
+buildenv_functions+=('buildenv_cxx')
+
+buildenv_cxx() {
+	check_append_debug_flags CXXFLAGS DEBUG_CXXFLAGS "-ffile-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}/${pkgbase}"
+}

scripts/libmakepkg/buildenv/debugflags.sh.in

@@ -31,7 +31,6 @@ buildenv_functions+=('buildenv_debugflags')
 
 buildenv_debugflags() {
 	if check_option "debug" "y" && ! check_option "buildflags" "n"; then
-		append_once DEBUG_CXXFLAGS "-ffile-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}/${pkgbase}"
-		append_once CXXFLAGS "$DEBUG_CXXFLAGS"
+		:
 	fi
 }

scripts/libmakepkg/buildenv/meson.build

@@ -5,6 +5,7 @@ sources = [
   'c.sh.in',
   'compiler.sh.in',
   'cpp.sh.in',
+  'cxx.sh.in',
   'debugflags.sh.in',
   'lto.sh.in',
   'makeflags.sh.in',