eclass/cmake: Sync with Gentoo

It's from Gentoo commit 759cec852497f888d93cccfedbc83f16eb765fb4.

sdk_container/src/third_party/portage-stable/eclass/cmake.eclass

@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: cmake.eclass
@@ -28,7 +28,7 @@ _CMAKE_ECLASS=1
 
 inherit flag-o-matic multiprocessing ninja-utils toolchain-funcs xdg-utils
 
-# @ECLASS-VARIABLE: BUILD_DIR
+# @ECLASS_VARIABLE: BUILD_DIR
 # @DEFAULT_UNSET
 # @DESCRIPTION:
 # Build directory where all cmake processed files should be generated.
@@ -38,13 +38,13 @@ inherit flag-o-matic multiprocessing ninja-utils toolchain-funcs xdg-utils
 [[ ${EAPI} == 7 ]] && : ${BUILD_DIR:=${WORKDIR}/${P}_build}
 # EAPI-8: set inside _cmake_check_build_dir
 
-# @ECLASS-VARIABLE: CMAKE_BINARY
+# @ECLASS_VARIABLE: CMAKE_BINARY
 # @DESCRIPTION:
 # Eclass can use different cmake binary than the one provided in by system.
 : ${CMAKE_BINARY:=cmake}
 
 [[ ${EAPI} == 7 ]] && : ${CMAKE_BUILD_TYPE:=Gentoo}
-# @ECLASS-VARIABLE: CMAKE_BUILD_TYPE
+# @ECLASS_VARIABLE: CMAKE_BUILD_TYPE
 # @DESCRIPTION:
 # Set to override default CMAKE_BUILD_TYPE. Only useful for packages
 # known to make use of "if (CMAKE_BUILD_TYPE MATCHES xxx)".
@@ -57,12 +57,12 @@ inherit flag-o-matic multiprocessing ninja-utils toolchain-funcs xdg-utils
 # In EAPI 7, the default was non-standard build type of Gentoo.
 : ${CMAKE_BUILD_TYPE:=RelWithDebInfo}
 
-# @ECLASS-VARIABLE: CMAKE_IN_SOURCE_BUILD
+# @ECLASS_VARIABLE: CMAKE_IN_SOURCE_BUILD
 # @DEFAULT_UNSET
 # @DESCRIPTION:
 # Set to enable in-source build.
 
-# @ECLASS-VARIABLE: CMAKE_MAKEFILE_GENERATOR
+# @ECLASS_VARIABLE: CMAKE_MAKEFILE_GENERATOR
 # @PRE_INHERIT
 # @DEFAULT_UNSET
 # @DESCRIPTION:
@@ -71,7 +71,7 @@ inherit flag-o-matic multiprocessing ninja-utils toolchain-funcs xdg-utils
 # The default is set to "ninja".
 : ${CMAKE_MAKEFILE_GENERATOR:=ninja}
 
-# @ECLASS-VARIABLE: CMAKE_REMOVE_MODULES_LIST
+# @ECLASS_VARIABLE: CMAKE_REMOVE_MODULES_LIST
 # @PRE_INHERIT
 # @DEFAULT_UNSET
 # @DESCRIPTION:
@@ -90,25 +90,25 @@ else
 	fi
 fi
 
-# @ECLASS-VARIABLE: CMAKE_USE_DIR
+# @ECLASS_VARIABLE: CMAKE_USE_DIR
 # @DESCRIPTION:
 # Sets the directory where we are working with cmake, for example when
 # application uses autotools and only one plugin needs to be done by cmake.
 # By default it uses current working directory (in EAPI-7: ${S}).
 
-# @ECLASS-VARIABLE: CMAKE_VERBOSE
+# @ECLASS_VARIABLE: CMAKE_VERBOSE
 # @DESCRIPTION:
 # Set to OFF to disable verbose messages during compilation
 : ${CMAKE_VERBOSE:=ON}
 
-# @ECLASS-VARIABLE: CMAKE_WARN_UNUSED_CLI
+# @ECLASS_VARIABLE: CMAKE_WARN_UNUSED_CLI
 # @DESCRIPTION:
 # Warn about variables that are declared on the command line
 # but not used. Might give false-positives.
 # "no" to disable (default) or anything else to enable.
 : ${CMAKE_WARN_UNUSED_CLI:=yes}
 
-# @ECLASS-VARIABLE: CMAKE_EXTRA_CACHE_FILE
+# @ECLASS_VARIABLE: CMAKE_EXTRA_CACHE_FILE
 # @USER_VARIABLE
 # @DEFAULT_UNSET
 # @DESCRIPTION:
@@ -116,7 +116,7 @@ fi
 # for econf and is needed to pass TRY_RUN results when cross-compiling.
 # Should be set by user in a per-package basis in /etc/portage/package.env.
 
-# @ECLASS-VARIABLE: CMAKE_QA_SRC_DIR_READONLY
+# @ECLASS_VARIABLE: CMAKE_QA_SRC_DIR_READONLY
 # @USER_VARIABLE
 # @DEFAULT_UNSET
 # @DESCRIPTION:
@@ -136,7 +136,7 @@ case ${CMAKE_MAKEFILE_GENERATOR} in
 		BDEPEND="sys-devel/make"
 		;;
 	ninja)
-		BDEPEND="dev-util/ninja"
+		BDEPEND="${NINJA_DEPEND}"
 		;;
 	*)
 		eerror "Unknown value for \${CMAKE_MAKEFILE_GENERATOR}"
@@ -363,13 +363,6 @@ cmake_src_prepare() {
 		die "FATAL: Unable to find CMakeLists.txt"
 	fi
 
-	# if ninja is enabled but not installed, the build could fail
-	# this could happen if ninja is manually enabled (eg. make.conf) but not installed
-	if [[ ${CMAKE_MAKEFILE_GENERATOR} == ninja ]] && ! has_version -b dev-util/ninja; then
-		eerror "CMAKE_MAKEFILE_GENERATOR is set to ninja, but ninja is not installed."
-		die "Please install dev-util/ninja or unset CMAKE_MAKEFILE_GENERATOR."
-	fi
-
 	local modules_list
 	if [[ ${EAPI} == 7 && $(declare -p CMAKE_REMOVE_MODULES_LIST) != "declare -a"* ]]; then
 		modules_list=( ${CMAKE_REMOVE_MODULES_LIST} )
@@ -406,6 +399,12 @@ cmake_src_prepare() {
 	_CMAKE_SRC_PREPARE_HAS_RUN=1
 }
 
+# @VARIABLE: MYCMAKEARGS
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# User-controlled environment variable containing arguments to be passed to
+# cmake in cmake_src_configure.
+
 # @FUNCTION: cmake_src_configure
 # @DESCRIPTION:
 # General function for configuring with cmake. Default behaviour is to start an
@@ -593,9 +592,12 @@ cmake_src_configure() {
 		"${mycmakeargs_local[@]}"
 		-DCMAKE_BUILD_TYPE="${CMAKE_BUILD_TYPE}"
 		-DCMAKE_TOOLCHAIN_FILE="${toolchain_file}"
-		"${MYCMAKEARGS}"
 	)
 
+	if [[ -n ${MYCMAKEARGS} ]] ; then
+		cmakeargs+=( "${MYCMAKEARGS}" )
+	fi
+
 	if [[ -n "${CMAKE_EXTRA_CACHE_FILE}" ]] ; then
 		cmakeargs+=( -C "${CMAKE_EXTRA_CACHE_FILE}" )
 	fi
@@ -665,7 +667,8 @@ cmake_src_test() {
 
 	[[ -n ${TEST_VERBOSE} ]] && myctestargs+=( --extra-verbose --output-on-failure )
 
-	set -- ctest -j "$(makeopts_jobs)" --test-load "$(makeopts_loadavg)" "${myctestargs[@]}" "$@"
+	set -- ctest -j "$(makeopts_jobs "${MAKEOPTS}" 999)" \
+		--test-load "$(makeopts_loadavg)" "${myctestargs[@]}" "$@"
 	echo "$@" >&2
 	if "$@" ; then
 		einfo "Tests succeeded."
@@ -695,11 +698,7 @@ cmake_src_test() {
 cmake_src_install() {
 	debug-print-function ${FUNCNAME} "$@"
 
-	_cmake_check_build_dir
+	DESTDIR="${D}" cmake_build install "$@"
-	pushd "${BUILD_DIR}" > /dev/null || die
-	DESTDIR="${D}" ${CMAKE_MAKEFILE_GENERATOR} install "$@" ||
-		die "died running ${CMAKE_MAKEFILE_GENERATOR} install"
-	popd > /dev/null || die
 
 	if [[ ${EAPI} == 7 ]]; then
 		pushd "${S}" > /dev/null || die