tools: add meson

meson is a next generation build system designed to have good defaults,
simpler build files, and fast compilation.

It is built upon python and uses ninja for compilation. The latter
provides fast by default (parallel) and problem free compilation.

There are over 40 packages already successfully using meson. The next
commit will convert pkgconf to use meson compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

include/meson.mk

@@ -0,0 +1,143 @@
+# To build your package using meson:
+#
+# include $(INCLUDE_DIR)/meson.mk
+# MESON_ARGS+=-Dfoo -Dbar=baz
+#
+# To pass additional environment variables to meson:
+#
+# MESON_VARS+=FOO=bar
+#
+# Default configure/compile/install targets are provided, but can be
+# overwritten if required:
+#
+# define Build/Configure
+#   $(call Build/Configure/Meson)
+#   ...
+# endef
+#
+# same for Build/Compile and Build/Install
+#
+# Host packages are built in the same fashion, just use these vars instead:
+#
+# HOST_BUILD_DEPENDS:=meson/host
+# MESON_HOST_ARGS+=-Dfoo -Dbar=baz
+# MESON_HOST_VARS+=FOO=bar
+
+MESON_DIR:=$(STAGING_DIR_HOST)/lib/meson
+
+MESON_HOST_BUILD_DIR:=$(HOST_BUILD_DIR)/openwrt-build
+MESON_HOST_VARS:=
+MESON_HOST_ARGS:=
+
+MESON_BUILD_DIR:=$(PKG_BUILD_DIR)/openwrt-build
+MESON_VARS:=
+MESON_ARGS:=
+
+ifneq ($(findstring i386,$(CONFIG_ARCH)),)
+MESON_ARCH:="x86"
+else ifneq ($(findstring powerpc64,$(CONFIG_ARCH)),)
+MESON_ARCH:="ppc64"
+else ifneq ($(findstring powerpc,$(CONFIG_ARCH)),)
+MESON_ARCH:="ppc"
+else ifneq ($(findstring mips64el,$(CONFIG_ARCH)),)
+MESON_ARCH:="mips64"
+else ifneq ($(findstring mipsel,$(CONFIG_ARCH)),)
+MESON_ARCH:="mips"
+else ifneq ($(findstring armeb,$(CONFIG_ARCH)),)
+MESON_ARCH:="arm"
+else
+MESON_ARCH:=$(CONFIG_ARCH)
+endif
+
+# this is undefined for just x64_64
+ifeq ($(origin CPU_TYPE),undefined)
+MESON_CPU:="generic"
+else
+MESON_CPU:="$(CPU_TYPE)$(if $(CPU_SUBTYPE),+$(CPU_SUBTYPE))"
+endif
+
+define Meson
+	$(2) $(STAGING_DIR_HOST)/bin/$(PYTHON) $(MESON_DIR)/meson.py $(1)
+endef
+
+define Meson/CreateNativeFile
+	$(STAGING_DIR_HOST)/bin/sed \
+		-e "s|@CC@|$(foreach BIN,$(HOSTCC),'$(BIN)',)|" \
+		-e "s|@CXX@|$(foreach BIN,$(HOSTCXX),'$(BIN)',)|" \
+		-e "s|@PKGCONFIG@|$(PKG_CONFIG)|" \
+		-e "s|@CFLAGS@|$(foreach FLAG,$(HOST_CFLAGS) $(HOST_CPPFLAGS),'$(FLAG)',)|" \
+		-e "s|@CXXFLAGS@|$(foreach FLAG,$(HOST_CXXFLAGS) $(HOST_CPPFLAGS),'$(FLAG)',)|" \
+		-e "s|@LDFLAGS@|$(foreach FLAG,$(HOST_LDFLAGS),'$(FLAG)',)|" \
+		-e "s|@PREFIX@|$(HOST_BUILD_PREFIX)|" \
+		< $(MESON_DIR)/openwrt-native.txt.in \
+		> $(1)
+endef
+
+define Meson/CreateCrossFile
+	$(STAGING_DIR_HOST)/bin/sed \
+		-e "s|@CC@|$(foreach BIN,$(TARGET_CC),'$(BIN)',)|" \
+		-e "s|@CXX@|$(foreach BIN,$(TARGET_CXX),'$(BIN)',)|" \
+		-e "s|@AR@|$(TARGET_AR)|" \
+		-e "s|@STRIP@|$(TARGET_CROSS)strip|" \
+		-e "s|@NM@|$(TARGET_NM)|" \
+		-e "s|@PKGCONFIG@|$(PKG_CONFIG)|" \
+		-e "s|@CFLAGS@|$(foreach FLAG,$(TARGET_CFLAGS) $(EXTRA_CFLAGS) $(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS),'$(FLAG)',)|" \
+		-e "s|@CXXFLAGS@|$(foreach FLAG,$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS) $(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS),'$(FLAG)',)|" \
+		-e "s|@LDFLAGS@|$(foreach FLAG,$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS),'$(FLAG)',)|" \
+		-e "s|@ARCH@|$(MESON_ARCH)|" \
+		-e "s|@CPU@|$(MESON_CPU)|" \
+		-e "s|@ENDIAN@|$(if $(CONFIG_BIG_ENDIAN),big,little)|" \
+		< $(MESON_DIR)/openwrt-cross.txt.in \
+		> $(1)
+endef
+
+define Host/Configure/Meson
+	$(call Meson/CreateNativeFile,$(HOST_BUILD_DIR)/openwrt-native.txt)
+	$(call Meson, \
+		--native-file $(HOST_BUILD_DIR)/openwrt-native.txt \
+		$(MESON_HOST_ARGS) \
+		$(MESON_HOST_BUILD_DIR) \
+		$(HOST_BUILD_DIR), \
+		$(MESON_HOST_VARS))
+endef
+
+define Host/Compile/Meson
+	+$(NINJA) -C $(MESON_HOST_BUILD_DIR) $(1)
+endef
+
+define Host/Install/Meson
+	+$(NINJA) -C $(MESON_HOST_BUILD_DIR) install
+endef
+
+define Host/Uninstall/Meson
+	+$(NINJA) -C $(MESON_HOST_BUILD_DIR) uninstall || true
+endef
+
+define Build/Configure/Meson
+	$(call Meson/CreateNativeFile,$(PKG_BUILD_DIR)/openwrt-native.txt)
+	$(call Meson/CreateCrossFile,$(PKG_BUILD_DIR)/openwrt-cross.txt)
+	$(call Meson, \
+		--buildtype plain \
+		--native-file $(PKG_BUILD_DIR)/openwrt-native.txt \
+		--cross-file $(PKG_BUILD_DIR)/openwrt-cross.txt \
+		$(MESON_ARGS) \
+		$(MESON_BUILD_DIR) \
+		$(MESON_BUILD_DIR)/.., \
+		$(MESON_VARS))
+endef
+
+define Build/Compile/Meson
+	+$(NINJA) -C $(MESON_BUILD_DIR) $(1)
+endef
+
+define Build/Install/Meson
+	+DESTDIR="$(PKG_INSTALL_DIR)" $(NINJA) -C $(MESON_BUILD_DIR) install
+endef
+
+Host/Configure=$(call Host/Configure/Meson)
+Host/Compile=$(call Host/Compile/Meson)
+Host/Install=$(call Host/Install/Meson)
+Host/Uninstall=$(call Host/Uninstall/Meson)
+Build/Configure=$(call Build/Configure/Meson)
+Build/Compile=$(call Build/Compile/Meson)
+Build/Install=$(call Build/Install/Meson)

tools/Makefile

@@ -23,7 +23,7 @@ endif
 
 tools-y += autoconf autoconf-archive automake bc bison cmake cpio dosfstools
 tools-y += e2fsprogs fakeroot findutils firmware-utils flex gengetopt
-tools-y += libressl libtool lzma m4 make-ext4fs missing-macros mkimage
+tools-y += libressl libtool lzma m4 make-ext4fs meson missing-macros mkimage
 tools-y += mklibs mtd-utils mtools ninja padjffs2 patch-image
 tools-y += patchelf pkgconf quilt squashfskit4 sstrip xxd zip zlib zstd
 tools-$(BUILD_B43_TOOLS) += b43-tools
@@ -57,6 +57,7 @@ $(curdir)/libressl/compile := $(curdir)/pkgconf/compile
 $(curdir)/libtool/compile := $(curdir)/m4/compile $(curdir)/autoconf/compile $(curdir)/automake/compile $(curdir)/missing-macros/compile
 $(curdir)/lzma-old/compile := $(curdir)/zlib/compile
 $(curdir)/make-ext4fs/compile := $(curdir)/zlib/compile
+$(curdir)/meson/compile := $(curdir)/ninja/compile
 $(curdir)/missing-macros/compile := $(curdir)/autoconf/compile
 $(curdir)/mkimage/compile += $(curdir)/libressl/compile
 $(curdir)/mklibs/compile := $(curdir)/libtool/compile

tools/meson/Makefile

@@ -0,0 +1,32 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=meson
+PKG_VERSION:=0.59.1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://github.com/mesonbuild/meson/releases/download/$(PKG_VERSION)
+PKG_HASH:=db586a451650d46bbe10984a87b79d9bcdc1caebf38d8e189f8848f8d502356d
+
+PKG_MAINTAINER:=Andre Heider <a.heider@gmail.com>
+PKG_LICENSE:=Apache-2.0
+PKG_LICENSE_FILES:=COPYING
+
+include $(INCLUDE_DIR)/host-build.mk
+
+define Host/Configure
+endef
+
+define Host/Compile
+endef
+
+define Host/Install
+	$(INSTALL_DIR) $(STAGING_DIR_HOST)/lib/meson
+	$(CP) $(HOST_BUILD_DIR)/* $(STAGING_DIR_HOST)/lib/meson/
+endef
+
+define Host/Clean
+	$(call Host/Clean/Default)
+	rm -rf $(STAGING_DIR_HOST)/lib/meson
+endef
+
+$(eval $(call HostBuild))

tools/meson/src/openwrt-cross.txt.in

@@ -0,0 +1,23 @@
+[binaries]
+c = [@CC@]
+cpp = [@CXX@]
+ar = '@AR@'
+strip = '@STRIP@'
+nm = '@NM@'
+pkgconfig = '@PKGCONFIG@'
+
+[built-in options]
+c_args = [@CFLAGS@]
+c_link_args = [@LDFLAGS@]
+cpp_args = [@CXXFLAGS@]
+cpp_link_args = [@LDFLAGS@]
+prefix = '/usr'
+
+[host_machine]
+system = 'linux'
+cpu_family = '@ARCH@'
+cpu = '@CPU@'
+endian = '@ENDIAN@'
+
+[properties]
+needs_exe_wrapper = true

tools/meson/src/openwrt-native.txt.in

@@ -0,0 +1,13 @@
+[binaries]
+c = [@CC@]
+cpp = [@CXX@]
+pkgconfig = '@PKGCONFIG@'
+
+[built-in options]
+c_args = [@CFLAGS@]
+c_link_args = [@LDFLAGS@]
+cpp_args = [@CXXFLAGS@]
+cpp_link_args = [@LDFLAGS@]
+prefix = '@PREFIX@'
+sbindir = 'bin'
+libdir = 'lib'