Re-add meson.eclass since the gentoo repository breaks it again

Signed-off-by: Martin Väth <mvath@google.com>

1 files changed, 273 insertions, 0 deletions

diff --git a/eclass/meson.eclass b/eclass/meson.eclass
new file mode 100644
index 00000000..0a80c6b6
--- /dev/null
+++ b/eclass/meson.eclass
@@ -0,0 +1,273 @@
+# Copyright 2017-2018 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: meson.eclass
+# @MAINTAINER:
+# William Hubbs <williamh@gentoo.org>
+# Mike Gilbert <floppym@gentoo.org>
+# @SUPPORTED_EAPIS: 6 7
+# @BLURB: common ebuild functions for meson-based packages
+# @DESCRIPTION:
+# This eclass contains the default phase functions for packages which
+# use the meson build system.
+#
+# @EXAMPLE:
+# Typical ebuild using meson.eclass:
+#
+# @CODE
+# EAPI=6
+#
+# inherit meson
+#
+# ...
+#
+# src_configure() {
+# 	local emesonargs=(
+# 		-Dqt4=$(usex qt4 true false)
+# 		-Dthreads=$(usex threads true false)
+# 		-Dtiff=$(usex tiff true false)
+# 	)
+# 	meson_src_configure
+# }
+#
+# ...
+#
+# @CODE
+
+case ${EAPI:-0} in
+	6|7) ;;
+	*) die "EAPI=${EAPI} is not supported" ;;
+esac
+
+if [[ ${__MESON_AUTO_DEPEND+set} == "set" ]] ; then
+	# See if we were included already, but someone changed the value
+	# of MESON_AUTO_DEPEND on us.  We could reload the entire
+	# eclass at that point, but that adds overhead, and it's trivial
+	# to re-order inherit in eclasses/ebuilds instead.  #409611
+	if [[ ${__MESON_AUTO_DEPEND} != ${MESON_AUTO_DEPEND} ]] ; then
+		die "MESON_AUTO_DEPEND changed value between inherits; please inherit meson.eclass first! ${__MESON_AUTO_DEPEND} -> ${MESON_AUTO_DEPEND}"
+	fi
+fi
+
+if [[ -z ${_MESON_ECLASS} ]]; then
+
+inherit ninja-utils python-utils-r1 toolchain-funcs
+
+fi
+
+EXPORT_FUNCTIONS src_configure src_compile src_test src_install
+
+if [[ -z ${_MESON_ECLASS} ]]; then
+_MESON_ECLASS=1
+
+MESON_DEPEND=">=dev-util/meson-0.45.1
+	>=dev-util/ninja-1.7.2"
+
+# @ECLASS-VARIABLE: MESON_AUTO_DEPEND
+# @DESCRIPTION:
+# Set to 'no' to disable automatically adding to DEPEND.  This lets
+# ebuilds form conditional depends by using ${MESON_DEPEND} in
+# their own DEPEND string.
+: ${MESON_AUTO_DEPEND:=yes}
+if [[ ${MESON_AUTO_DEPEND} != "no" ]] ; then
+	if [[ ${EAPI:-0} == [0123456] ]]; then
+		DEPEND=${MESON_DEPEND}
+	else
+		BDEPEND=${MESON_DEPEND}
+	fi
+fi
+__MESON_AUTO_DEPEND=${MESON_AUTO_DEPEND} # See top of eclass
+
+# @ECLASS-VARIABLE: BUILD_DIR
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# Build directory, location where all generated files should be placed.
+# If this isn't set, it defaults to ${WORKDIR}/${P}-build.
+
+# @ECLASS-VARIABLE: EMESON_SOURCE
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# The location of the source files for the project; this is the source
+# directory to pass to meson.
+# If this isn't set, it defaults to ${S}
+
+# @VARIABLE: emesonargs
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# Optional meson arguments as Bash array; this should be defined before
+# calling meson_src_configure.
+
+
+read -d '' __MESON_ARRAY_PARSER <<"EOF"
+import shlex
+import sys
+
+# See http://mesonbuild.com/Syntax.html#strings
+def quote(str):
+	escaped = str.replace("\\\\", "\\\\\\\\").replace("'", "\\\\'")
+	return "'{}'".format(escaped)
+
+print("[{}]".format(
+	", ".join([quote(x) for x in shlex.split(" ".join(sys.argv[1:]))])))
+EOF
+
+# @FUNCTION: _meson_env_array
+# @INTERNAL
+# @DESCRIPTION:
+# Parses the command line flags and converts them into an array suitable for
+# use in a cross file.
+#
+# Input: --single-quote=\' --double-quote=\" --dollar=\$ --backtick=\`
+#        --backslash=\\ --full-word-double="Hello World"
+#        --full-word-single='Hello World'
+#        --full-word-backslash=Hello\ World
+#        --simple --unicode-8=© --unicode-16=𐐷 --unicode-32=𐤅
+#
+# Output: ['--single-quote=\'', '--double-quote="', '--dollar=$',
+#          '--backtick=`', '--backslash=\\', '--full-word-double=Hello World',
+#          '--full-word-single=Hello World',
+#          '--full-word-backslash=Hello World', '--simple', '--unicode-8=©',
+#          '--unicode-16=𐐷', '--unicode-32=𐤅']
+#
+_meson_env_array() {
+	python -c "${__MESON_ARRAY_PARSER}" "$@"
+}
+
+# @FUNCTION: _meson_create_cross_file
+# @INTERNAL
+# @DESCRIPTION:
+# Creates a cross file. meson uses this to define settings for
+# cross-compilers. This function is called from meson_src_configure.
+_meson_create_cross_file() {
+	# Reference: http://mesonbuild.com/Cross-compilation.html
+
+	# system roughly corresponds to uname -s (lowercase)
+	local system=unknown
+	case ${CHOST} in
+		*-aix*)          system=aix ;;
+		*-cygwin*)       system=cygwin ;;
+		*-darwin*)       system=darwin ;;
+		*-freebsd*)      system=freebsd ;;
+		*-linux*)        system=linux ;;
+		mingw*|*-mingw*) system=windows ;;
+		*-solaris*)      system=sunos ;;
+	esac
+
+	local cpu_family=$(tc-arch)
+	case ${cpu_family} in
+		amd64) cpu_family=x86_64 ;;
+		arm64) cpu_family=aarch64 ;;
+	esac
+
+	# This may require adjustment based on CFLAGS
+	local cpu=${CHOST%%-*}
+
+	cat > "${T}/meson.${CHOST}.${ABI}" <<-EOF
+	[binaries]
+	ar = $(_meson_env_array "$(tc-getAR)")
+	c = $(_meson_env_array "$(tc-getCC)")
+	cpp = $(_meson_env_array "$(tc-getCXX)")
+	fortran = $(_meson_env_array "$(tc-getFC)")
+	llvm-config = '$(tc-getPROG LLVM_CONFIG llvm-config)'
+	objc = $(_meson_env_array "$(tc-getPROG OBJC cc)")
+	objcpp = $(_meson_env_array "$(tc-getPROG OBJCXX c++)")
+	pkgconfig = '$(tc-getPKG_CONFIG)'
+	strip = $(_meson_env_array "$(tc-getSTRIP)")
+
+	[properties]
+	c_args = $(_meson_env_array "${CFLAGS} ${CPPFLAGS}")
+	c_link_args = $(_meson_env_array "${CFLAGS} ${LDFLAGS}")
+	cpp_args = $(_meson_env_array "${CXXFLAGS} ${CPPFLAGS}")
+	cpp_link_args = $(_meson_env_array "${CXXFLAGS} ${LDFLAGS}")
+	fortran_args = $(_meson_env_array "${FCFLAGS}")
+	fortran_link_args = $(_meson_env_array "${FCFLAGS} ${LDFLAGS}")
+	objc_args = $(_meson_env_array "${OBJCFLAGS} ${CPPFLAGS}")
+	objc_link_args = $(_meson_env_array "${OBJCFLAGS} ${LDFLAGS}")
+	objcpp_args = $(_meson_env_array "${OBJCXXFLAGS} ${CPPFLAGS}")
+	objcpp_link_args = $(_meson_env_array "${OBJCXXFLAGS} ${LDFLAGS}")
+
+	[host_machine]
+	system = '${system}'
+	cpu_family = '${cpu_family}'
+	cpu = '${cpu}'
+	endian = '$(tc-endian)'
+	EOF
+}
+
+# @FUNCTION: meson_use
+# @USAGE: <USE flag> [option name]
+# @DESCRIPTION:
+# Given a USE flag and meson project option, outputs a string like:
+#
+#   -Doption=true
+#   -Doption=false
+#
+# If the project option is unspecified, it defaults to the USE flag.
+meson_use() {
+	usex "$1" "-D${2-$1}=true" "-D${2-$1}=false"
+}
+
+# @FUNCTION: meson_src_configure
+# @USAGE: [extra meson arguments]
+# @DESCRIPTION:
+# This is the meson_src_configure function.
+meson_src_configure() {
+	debug-print-function ${FUNCNAME} "$@"
+
+	# Common args
+	local mesonargs=(
+		--buildtype plain
+		--libdir "$(get_libdir)"
+		--localstatedir "${EPREFIX}/var/lib"
+		--prefix "${EPREFIX}/usr"
+		--sysconfdir "${EPREFIX}/etc"
+		--wrap-mode nodownload
+		)
+
+	if tc-is-cross-compiler || [[ ${ABI} != ${DEFAULT_ABI-${ABI}} ]]; then
+		_meson_create_cross_file || die "unable to write meson cross file"
+		mesonargs+=( --cross-file "${T}/meson.${CHOST}.${ABI}" )
+	fi
+
+	# https://bugs.gentoo.org/625396
+	python_export_utf8_locale
+
+	# Append additional arguments from ebuild
+	mesonargs+=("${emesonargs[@]}")
+
+	BUILD_DIR="${BUILD_DIR:-${WORKDIR}/${P}-build}"
+	set -- meson "${mesonargs[@]}" "$@" \
+		"${EMESON_SOURCE:-${S}}" "${BUILD_DIR}"
+	echo "$@"
+	tc-env_build "$@" || die
+}
+
+# @FUNCTION: meson_src_compile
+# @DESCRIPTION:
+# This is the meson_src_compile function.
+meson_src_compile() {
+	debug-print-function ${FUNCNAME} "$@"
+
+	eninja -C "${BUILD_DIR}"
+}
+
+# @FUNCTION: meson_src_test
+# @DESCRIPTION:
+# This is the meson_src_test function.
+meson_src_test() {
+	debug-print-function ${FUNCNAME} "$@"
+
+	eninja -C "${BUILD_DIR}" test
+}
+
+# @FUNCTION: meson_src_install
+# @DESCRIPTION:
+# This is the meson_src_install function.
+meson_src_install() {
+	debug-print-function ${FUNCNAME} "$@"
+
+	DESTDIR="${D}" eninja -C "${BUILD_DIR}" install
+	einstalldocs
+}
+
+fi