Split prepare_buildenv() to libmakepkg

This opens the door for third parties to provide libmakepkg
extentions for the purpose of altering the build environment.
Signed-off-by: Que Quotion <quequotion@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/Makefile.am

@@ -40,6 +40,7 @@ LIBRARY = \
 libmakepkgdir = $(datarootdir)/makepkg
 
 LIBMAKEPKGDIRS = \
+	buildenv \
 	executable \
 	integrity \
 	lint_config \
@@ -61,6 +62,11 @@ LIBMAKEPKG_IN = \
 	libmakepkg/executable/strip.sh \
 	libmakepkg/executable/sudo.sh \
 	libmakepkg/executable/vcs.sh \
+	libmakepkg/buildenv.sh \
+	libmakepkg/buildenv/buildflags.sh \
+	libmakepkg/buildenv/compiler.sh \
+	libmakepkg/buildenv/debugflags.sh \
+	libmakepkg/buildenv/makeflags.sh \
 	libmakepkg/integrity.sh \
 	libmakepkg/integrity/generate_checksum.sh \
 	libmakepkg/integrity/generate_signature.sh \

scripts/libmakepkg/buildenv.sh.in

+#!/bin/bash
+#
+#   buildenv.sh - functions for altering the build environment before
+#   compiliation
+#
+#   Copyright (c) 2015-2018 Pacman Development Team <pacman-dev@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 "$LIBMAKEPKG_BUILDENV_SH" ]] && return
+LIBMAKEPKG_BUILDENV_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+
+
+declare -a buildenv_functions build_options
+
+for lib in "$LIBRARY/buildenv/"*.sh; do
+	source "$lib"
+done
+
+readonly -a buildenv_functions build_options
+
+prepare_buildenv() {
+	for func in ${buildenv_functions[@]}; do
+		$func
+	done
+
+	# ensure all necessary build variables are exported
+	export CPPFLAGS CFLAGS CXXFLAGS LDFLAGS MAKEFLAGS CHOST
+}

scripts/libmakepkg/buildenv/buildflags.sh.in

+#!/usr/bin/bash
+#
+#   buildflags.sh - Clear user-specified buildflags if requested
+#
+#   Copyright (c) 2011-2018 Pacman Development Team <pacman-dev@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 "$LIBMAKEPKG_BUILDENV_BUILDFLAGS_SH" ]] && return
+LIBMAKEPKG_BUILDENV_BUILDFLAGS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+build_options+=('buildflags')
+buildenv_functions+=('buildenv_buildflags')
+
+buildenv_buildflags() {
+	if check_option "buildflags" "n"; then
+		unset CPPFLAGS CFLAGS DEBUG_CFLAGS CXXFLAGS DEBUG_CXXFLAGS LDFLAGS
+	fi
+}

scripts/libmakepkg/buildenv/compiler.sh.in

+#!/usr/bin/bash
+#
+#   compiler.sh - CCache and DistCC compilation
+#   ccache - Cache compilations and reuse them to save time on repetitions
+#   distcc - Distribute compilation of C and C++ across machines
+#
+#   Copyright (c) 2007-2018 Pacman Development Team <pacman-dev@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 "$LIBMAKEPKG_BUILDENV_COMPILER_SH" ]] && return
+LIBMAKEPKG_BUILDENV_COMPILER_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+build_options+=('ccache' 'distcc')
+buildenv_functions+=('buildenv_ccache' 'buildenv_distcc')
+
+using_ccache=0
+
+buildenv_ccache() {
+	if check_buildoption "ccache" "y"; then
+		if [ -d /usr/lib/ccache/bin ]; then
+			export PATH="/usr/lib/ccache/bin:$PATH"
+			using_ccache=1
+		fi
+	fi
+}
+
+buildenv_distcc() {
+	if check_buildoption "distcc" "y"; then
+		if (( using_ccache )); then
+			export CCACHE_PREFIX="${CCACHE_PREFIX:+$CCACHE_PREFIX }distcc"
+			export CCACHE_BASEDIR="$srcdir"
+		elif [[ -d /usr/lib/distcc/bin ]]; then
+			export PATH="/usr/lib/distcc/bin:$PATH"
+		fi
+
+		export DISTCC_HOSTS
+	fi
+}

scripts/libmakepkg/buildenv/debugflags.sh.in

+#!/usr/bin/bash
+#
+#   debugflags.sh - Specify flags for building a package with debugging
+#   symbols
+#
+#   Copyright (c) 2012-2018 Pacman Development Team <pacman-dev@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 "$LIBMAKEPKG_BUILDENV_DEBUGFLAGS_SH" ]] && return
+LIBMAKEPKG_BUILDENV_DEBUGFLAGS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+buildenv_functions+=('buildenv_debugflags')
+
+buildenv_debugflags() {
+	if check_option "debug" "y"; then
+		DEBUG_CFLAGS+=" -fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
+		DEBUG_CXXFLAGS+=" -fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
+		CFLAGS+=" $DEBUG_CFLAGS"
+		CXXFLAGS+=" $DEBUG_CXXFLAGS"
+	fi
+}

scripts/libmakepkg/buildenv/makeflags.sh.in

+#!/usr/bin/bash
+#
+#   makeflags.sh - Clear user-specified makeflags if requested
+#
+#   Copyright (c) 2007-2018 Pacman Development Team <pacman-dev@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 "$LIBMAKEPKG_BUILDENV_MAKEFLAGS_SH" ]] && return
+LIBMAKEPKG_BUILDENV_MAKEFLAGS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+build_options+=('makeflags')
+buildenv_functions+=('buildenv_makeflags')
+
+buildenv_makeflags() {
+	if check_option "makeflags" "n"; then
+		unset MAKEFLAGS
+	fi
+}

scripts/libmakepkg/buildenv/meson.build

+libmakepkg_module = 'buildenv'
+
+sources = [
+  'buildflags.sh.in',
+  'compiler.sh.in',
+  'debugflags.sh.in',
+  'makeflags.sh.in',
+]
+
+foreach src : sources
+  output_dir = join_paths(get_option('datadir'), 'makepkg', libmakepkg_module)
+
+  custom_target(
+    libmakepkg_module + '_' + src.underscorify(),
+    command : [ SCRIPT_EDITOR, '@INPUT@', '@OUTPUT@' ],
+    input : src,
+    output : '@BASENAME@',
+    install : true,
+    install_dir : output_dir)
+endforeach

scripts/libmakepkg/meson.build

 libmakepkg_modules = [
+  { 'name' : 'buildenv',      'has_subdir' : true },
   { 'name' : 'executable',    'has_subdir' : true },
   { 'name' : 'integrity',     'has_subdir' : true },
   { 'name' : 'lint_config',   'has_subdir' : true },

scripts/makepkg.sh.in

@@ -48,11 +48,10 @@ declare -r startdir="$(pwd -P)"
 
 LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
 
-build_options=('ccache' 'distcc' 'buildflags' 'makeflags')
 splitpkg_overrides=('pkgdesc' 'arch' 'url' 'license' 'groups' 'depends'
                     'optdepends' 'provides' 'conflicts' 'replaces' 'backup'
                     'options' 'install' 'changelog')
-readonly -a build_options splitpkg_overrides
+readonly -a splitpkg_overrides
 
 known_hash_algos=('md5' 'sha1' 'sha224' 'sha256' 'sha384' 'sha512')
 
@@ -380,47 +379,6 @@ source_buildfile() {
 	source_safe "$@"
 }
 
-prepare_buildenv() {
-	# clear user-specified buildflags if requested
-	if check_option "buildflags" "n"; then
-		unset CPPFLAGS CFLAGS DEBUG_CFLAGS CXXFLAGS DEBUG_CXXFLAGS LDFLAGS
-	fi
-
-	if check_option "debug" "y"; then
-		DEBUG_CFLAGS+=" -fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
-		DEBUG_CXXFLAGS+=" -fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
-		CFLAGS+=" $DEBUG_CFLAGS"
-		CXXFLAGS+=" $DEBUG_CXXFLAGS"
-	fi
-
-	# clear user-specified makeflags if requested
-	if check_option "makeflags" "n"; then
-		unset MAKEFLAGS
-	fi
-
-	# ensure all necessary build variables are exported
-	export CPPFLAGS CFLAGS CXXFLAGS LDFLAGS MAKEFLAGS CHOST
-
-	local ccache=0
-
-	# use ccache if it is requested (check buildenv and PKGBUILD opts)
-	if check_buildoption "ccache" "y" && [[ -d /usr/lib/ccache/bin ]]; then
-		export PATH="/usr/lib/ccache/bin:$PATH"
-		ccache=1
-	fi
-
-	# use distcc if it is requested (check buildenv and PKGBUILD opts)
-	if check_buildoption "distcc" "y"; then
-		if (( ccache )); then
-			export CCACHE_PREFIX="${CCACHE_PREFIX:+$CCACHE_PREFIX }distcc"
-			export CCACHE_BASEDIR="$srcdir"
-		elif [[ -d /usr/lib/distcc/bin ]]; then
-			export PATH="/usr/lib/distcc/bin:$PATH"
-		fi
-		export DISTCC_HOSTS
-	fi
-}
-
 run_function_safe() {
 	local restoretrap restoreshopt