From: Que Quotion <quequot...@gmail.com>

As Eli Schwartz has pointed out:
https://lists.archlinux.org/pipermail/pacman-dev/2018-May/022501.html

It would be beneficial to makepkg to have this function ported
to libmakepkg and split into individual scripts.

Supersedes: https://patchwork.archlinux.org/patch/540/

Signed-off-by: Que Quotion <quequot...@gmail.com>
---
 scripts/Makefile.am                          |  6 ++
 scripts/libmakepkg/buildenv.sh.in            | 55 ++++++++++++++++++
 scripts/libmakepkg/buildenv/buildflags.sh.in | 34 +++++++++++
 scripts/libmakepkg/buildenv/ccache.sh.in     | 45 +++++++++++++++
 scripts/libmakepkg/buildenv/distcc.sh.in     | 47 +++++++++++++++
 scripts/libmakepkg/buildenv/makeflags.sh.in  | 34 +++++++++++
 scripts/libmakepkg/buildenv/meson.build      | 20 +++++++
 scripts/libmakepkg/meson.build               |  1 +
 scripts/makepkg.sh.in                        | 60 +-------------------
 9 files changed, 243 insertions(+), 59 deletions(-)
 create mode 100644 scripts/libmakepkg/buildenv.sh.in
 create mode 100644 scripts/libmakepkg/buildenv/buildflags.sh.in
 create mode 100644 scripts/libmakepkg/buildenv/ccache.sh.in
 create mode 100644 scripts/libmakepkg/buildenv/distcc.sh.in
 create mode 100644 scripts/libmakepkg/buildenv/makeflags.sh.in
 create mode 100644 scripts/libmakepkg/buildenv/meson.build

diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index c6b6220e..8e669f71 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -41,6 +41,7 @@ LIBRARY = \
 libmakepkgdir = $(datarootdir)/makepkg
 
 LIBMAKEPKGDIRS = \
+       buildenv \
        integrity \
        lint_config \
        lint_package \
@@ -50,6 +51,11 @@ LIBMAKEPKGDIRS = \
        util
 
 LIBMAKEPKG_IN = \
+       libmakepkg/buildenv.sh \
+       libmakepkg/buildenv/buildflags.sh \
+       libmakepkg/buildenv/ccache.sh \
+       libmakepkg/buildenv/distcc.sh \
+       libmakepkg/buildenv/makeflags.sh \
        libmakepkg/integrity.sh \
        libmakepkg/integrity/generate_checksum.sh \
        libmakepkg/integrity/generate_signature.sh \
diff --git a/scripts/libmakepkg/buildenv.sh.in 
b/scripts/libmakepkg/buildenv.sh.in
new file mode 100644
index 00000000..a14a3a9a
--- /dev/null
+++ b/scripts/libmakepkg/buildenv.sh.in
@@ -0,0 +1,55 @@
+#!/bin/bash
+#
+#   buildenv.sh - functions for altering the build environment before
+#   compiliation
+#
+#   Copyright (c) 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 "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/option.sh"
+
+
+declare -a build_options
+
+for lib in "$LIBRARY/buildenv/"*.sh; do
+       source "$lib"
+done
+
+readonly -a build_options
+
+prepare_buildenv() {
+       msg "$(gettext "Preparing build environment...")"
+
+       for func in ${build_options[@]}; do
+               $func
+       done
+
+       if check_option "debug" "y"; then
+               DEBUG_CFLAGS+=" 
-fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
+               DEBUG_CXXFLAGS+=" 
-fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
+               CFLAGS+=" $DEBUG_CFLAGS"
+               CXXFLAGS+=" $DEBUG_CXXFLAGS"
+       fi
+
+       # ensure all necessary build variables are exported
+       export CPPFLAGS CFLAGS CXXFLAGS LDFLAGS MAKEFLAGS CHOST
+}
diff --git a/scripts/libmakepkg/buildenv/buildflags.sh.in 
b/scripts/libmakepkg/buildenv/buildflags.sh.in
new file mode 100644
index 00000000..fb49a85c
--- /dev/null
+++ b/scripts/libmakepkg/buildenv/buildflags.sh.in
@@ -0,0 +1,34 @@
+#!/usr/bin/bash
+#
+#   buildflags.sh - Clear user-specified buildflags if requested
+#
+#   Copyright (c) 2018 Pacman Development Team <pacman-dev@archlinux.org>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[[ -n "$LIBMAKEPKG_BUILDENV_BUILDFLAGS_SH" ]] && return
+LIBMAKEPKG_BUILDENV_BUILDFLAGS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+build_options+=('buildflags')
+
+buildflags() {
+       if check_option "buildflags" "n"; then
+               unset CPPFLAGS CFLAGS CXXFLAGS LDFLAGS
+       fi
+}
diff --git a/scripts/libmakepkg/buildenv/ccache.sh.in 
b/scripts/libmakepkg/buildenv/ccache.sh.in
new file mode 100644
index 00000000..122033a9
--- /dev/null
+++ b/scripts/libmakepkg/buildenv/ccache.sh.in
@@ -0,0 +1,45 @@
+#!/usr/bin/bash
+#
+#   ccache.sh - Cache compiliations and recycle them to save time on 
repititions
+#
+#   Copyright (c) 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 "$LIBMAKEPKG_BUILDENV_CCACHE_SH" ]] && return
+LIBMAKEPKG_BUILDENV_CCACHE_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/option.sh"
+
+build_options+=('ccache')
+
+local ccache=0
+
+ccache() {
+       if check_buildoption "ccache" "y"; then
+               if ! type -p ccache >/dev/null; then
+                       error "$(gettext "Cannot find the %s binary required 
for compiler cache usage.")" "ccache"
+                       return 1
+               fi
+
+               if [ -d /usr/lib/ccache/bin ]; then
+                       export PATH="/usr/lib/ccache/bin:$PATH"
+                       ccache=1
+               fi
+       fi
+}
diff --git a/scripts/libmakepkg/buildenv/distcc.sh.in 
b/scripts/libmakepkg/buildenv/distcc.sh.in
new file mode 100644
index 00000000..f7580705
--- /dev/null
+++ b/scripts/libmakepkg/buildenv/distcc.sh.in
@@ -0,0 +1,47 @@
+#!/usr/bin/bash
+#
+#   distcc.sh - Distribute compliation to reduce compilation time
+#
+#   Copyright (c) 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 "$LIBMAKEPKG_BUILDENV_DISTCC_SH" ]] && return
+LIBMAKEPKG_BUILDENV_DISTCC_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/option.sh"
+
+build_options+=('distcc')
+
+distcc() {
+       if check_buildoption "distcc" "y"; then
+               if ! type -p distcc >/dev/null; then
+                       error "$(gettext "Cannot find the %s binary required 
for distributed compilation.")" "distcc"
+                       return 1
+               fi
+
+               if (( ccache )); then
+                       export CCACHE_PREFIX="${CCACHE_PREFIX:+$CCACHE_PREFIX 
}distcc"
+                       export CCACHE_BASEDIR="$srcdir"
+               elif [[ -d /usr/lib/distcc/bin ]]; then
+                       export PATH="/usr/lib/distcc/bin:$PATH"
+               fi
+
+               export DISTCC_HOSTS
+       fi
+}
diff --git a/scripts/libmakepkg/buildenv/makeflags.sh.in 
b/scripts/libmakepkg/buildenv/makeflags.sh.in
new file mode 100644
index 00000000..53ac1e4c
--- /dev/null
+++ b/scripts/libmakepkg/buildenv/makeflags.sh.in
@@ -0,0 +1,34 @@
+#!/usr/bin/bash
+#
+#   makeflags.sh - Clear user-specified makeflags if requested
+#
+#   Copyright (c) 2018 Pacman Development Team <pacman-dev@archlinux.org>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[[ -n "$LIBMAKEPKG_BUILDENV_MAKEFLAGS_SH" ]] && return
+LIBMAKEPKG_BUILDENV_MAKEFLAGS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+build_options+=('makeflags')
+
+makeflags() {
+       if check_option "makeflags" "n"; then
+               unset MAKEFLAGS
+       fi
+}
diff --git a/scripts/libmakepkg/buildenv/meson.build 
b/scripts/libmakepkg/buildenv/meson.build
new file mode 100644
index 00000000..e0d07287
--- /dev/null
+++ b/scripts/libmakepkg/buildenv/meson.build
@@ -0,0 +1,20 @@
+libmakepkg_module = 'buildenv'
+
+sources = [
+  'buildflags.sh.in',
+  'ccache.sh.in',
+  'distcc.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
diff --git a/scripts/libmakepkg/meson.build b/scripts/libmakepkg/meson.build
index 07475b4d..3a487f0d 100644
--- a/scripts/libmakepkg/meson.build
+++ b/scripts/libmakepkg/meson.build
@@ -1,4 +1,5 @@
 libmakepkg_modules = [
+  { 'name' : 'buildenv',      'has_subdir' : true },
   { 'name' : 'integrity',     'has_subdir' : true },
   { 'name' : 'lint_config',   'has_subdir' : true },
   { 'name' : 'lint_package',  'has_subdir' : true },
diff --git a/scripts/makepkg.sh.in b/scripts/makepkg.sh.in
index 3ac03d11..8ce006fb 100644
--- a/scripts/makepkg.sh.in
+++ b/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 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
 
@@ -1029,22 +987,6 @@ check_software() {
                done
        fi
 
-       # distcc - compilation with distcc
-       if check_buildoption "distcc" "y"; then
-               if ! type -p distcc >/dev/null; then
-                       error "$(gettext "Cannot find the %s binary required 
for distributed compilation.")" "distcc"
-                       ret=1
-               fi
-       fi
-
-       # ccache - compilation with ccache
-       if check_buildoption "ccache" "y"; then
-               if ! type -p ccache >/dev/null; then
-                       error "$(gettext "Cannot find the %s binary required 
for compiler cache usage.")" "ccache"
-                       ret=1
-               fi
-       fi
-
        # strip - strip symbols from binaries/libraries
        if check_option "strip" "y"; then
                if ! type -p strip >/dev/null; then
-- 
2.19.1

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