[Buildroot] [PATCH v2 3/3] package/pkg-meson: move crosscompilation support out of package

[Norbert Lange <nolange79@gmail.com>]

install the cross-compilation.conf file when setting up the
toolchain, not as part of host-meson.
This allows external usage of the buildroot toolchain through meson,
whether the host-meson package is built or not (similar to other build systems).

Removed a few variables, as they were only used to communicate between
meson package and pkg-meson and are needed anymore.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
---
 package/meson/meson.mk                        | 32 -------
 package/pkg-meson.mk                          | 90 ++++++++++++-------
 .../misc}/cross-compilation.conf.in           |  0
 3 files changed, 60 insertions(+), 62 deletions(-)
 rename {package/meson => support/misc}/cross-compilation.conf.in (100%)

diff --git a/package/meson/meson.mk b/package/meson/meson.mk
index 8633a2f717..acbd21b6f1 100644
--- a/package/meson/meson.mk
+++ b/package/meson/meson.mk
@@ -13,38 +13,6 @@ MESON_SETUP_TYPE = setuptools
 HOST_MESON_DEPENDENCIES = host-ninja
 HOST_MESON_NEEDS_HOST_PYTHON = python3
 
-HOST_MESON_TARGET_ENDIAN = $(call qstrip,$(call LOWERCASE,$(BR2_ENDIAN)))
-HOST_MESON_TARGET_CPU = $(GCC_TARGET_CPU)
-
-# https://mesonbuild.com/Reference-tables.html#cpu-families
-ifeq ($(BR2_arcle)$(BR2_arceb),y)
-HOST_MESON_TARGET_CPU_FAMILY = arc
-else ifeq ($(BR2_arm)$(BR2_armeb),y)
-HOST_MESON_TARGET_CPU_FAMILY = arm
-else ifeq ($(BR2_aarch64)$(BR2_aarch64_be),y)
-HOST_MESON_TARGET_CPU_FAMILY = aarch64
-else ifeq ($(BR2_i386),y)
-HOST_MESON_TARGET_CPU_FAMILY = x86
-else ifeq ($(BR2_mips)$(BR2_mipsel),y)
-HOST_MESON_TARGET_CPU_FAMILY = mips
-else ifeq ($(BR2_mips64)$(BR2_mips64el),y)
-HOST_MESON_TARGET_CPU_FAMILY = mips64
-else ifeq ($(BR2_powerpc),y)
-HOST_MESON_TARGET_CPU_FAMILY = ppc
-else ifeq ($(BR2_powerpc64)$(BR2_powerpc64le),y)
-HOST_MESON_TARGET_CPU_FAMILY = ppc64
-else ifeq ($(BR2_riscv),y)
-HOST_MESON_TARGET_CPU_FAMILY = riscv64
-else ifeq ($(BR2_sparc),y)
-HOST_MESON_TARGET_CPU_FAMILY = sparc
-else ifeq ($(BR2_sparc64),y)
-HOST_MESON_TARGET_CPU_FAMILY = sparc64
-else ifeq ($(BR2_x86_64),y)
-HOST_MESON_TARGET_CPU_FAMILY = x86_64
-else
-HOST_MESON_TARGET_CPU_FAMILY = $(ARCH)
-endif
-
 # Avoid interpreter shebang longer than 128 chars
 define HOST_MESON_SET_INTERPRETER
 	$(SED) '1s:.*:#!/usr/bin/env python3:' $(HOST_DIR)/bin/meson
diff --git a/package/pkg-meson.mk b/package/pkg-meson.mk
index 3a34ba703b..a9ded9fe5a 100644
--- a/package/pkg-meson.mk
+++ b/package/pkg-meson.mk
@@ -57,29 +57,17 @@ $(2)_NINJA_ENV		?=
 ifndef $(2)_CONFIGURE_CMDS
 ifeq ($(4),target)
 
-$(2)_CFLAGS ?= $$(TARGET_CFLAGS)
-$(2)_LDFLAGS ?= $$(TARGET_LDFLAGS)
-$(2)_CXXFLAGS ?= $$(TARGET_CXXFLAGS)
-
 # Configure package for target
 #
 #
 define $(2)_CONFIGURE_CMDS
 	rm -rf $$($$(PKG)_SRCDIR)/build
 	mkdir -p $$($$(PKG)_SRCDIR)/build
-	sed -e 's%@TARGET_CROSS@%$$(TARGET_CROSS)%g' \
-	    -e 's%@TARGET_ARCH@%$$(HOST_MESON_TARGET_CPU_FAMILY)%g' \
-	    -e 's%@TARGET_CPU@%$$(HOST_MESON_TARGET_CPU)%g' \
-	    -e 's%@TARGET_ENDIAN@%$$(HOST_MESON_TARGET_ENDIAN)%g' \
-	    -e "s%@TARGET_CFLAGS@%$$(call make-sq-comma-list,$$($(2)_CFLAGS))%g" \
-	    -e "s%@TARGET_LDFLAGS@%$$(call make-sq-comma-list,$$($(2)_LDFLAGS))%g" \
-	    -e "s%@TARGET_CXXFLAGS@%$$(call make-sq-comma-list,$$($(2)_CXXFLAGS))%g" \
-	    -e 's%@HOST_DIR@%$$(HOST_DIR)%g' \
-	    -e 's%@STAGING_DIR@%$$(STAGING_DIR)%g' \
-	    -e 's%@STATIC@%$$(if $$(BR2_STATIC_LIBS),true,false)%g' \
-	    -e "/^\[binaries\]$$$$/s:$$$$:$$(foreach x,$$($(2)_MESON_EXTRA_BINARIES),\n$$(x)):" \
+	sed -e "/^\[binaries\]$$$$/s:$$$$:$$(foreach x,$$($(2)_MESON_EXTRA_BINARIES),\n$$(x)):" \
 	    -e "/^\[properties\]$$$$/s:$$$$:$$(foreach x,$$($(2)_MESON_EXTRA_PROPERTIES),\n$$(x)):" \
-	    package/meson/cross-compilation.conf.in \
+	    $$(call PKG_MESON_CROSSCONFIG_SED,$$(if $$($(2)_CFLAGS),$(2)_CFLAGS,TARGET_CFLAGS), \
+	            $$(if $$($(2)_CXXFLAGS),$(2)_CXXFLAGS,TARGET_CXXFLAGS), \
+	            $$(if $$($(2)_LDFLAGS),$(2)_LDFLAGS,TARGET_LDFLAGS)) \
 	    > $$($$(PKG)_SRCDIR)/build/cross-compilation.conf
 	PATH=$$(BR_PATH) $$($$(PKG)_CONF_ENV) $$(MESON) \
 		--prefix=/usr \
@@ -178,30 +166,72 @@ meson-package = $(call inner-meson-package,$(pkgname),$(call UPPERCASE,$(pkgname
 host-meson-package = $(call inner-meson-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)
 
 ################################################################################
-# Generation of the Meson cross-compilation.conf file
+# Generation of the Meson compile flags and cross-compilation file
 ################################################################################
 
+# https://mesonbuild.com/Reference-tables.html#cpu-families
+ifeq ($(BR2_arcle)$(BR2_arceb),y)
+PKG_MESON_TARGET_CPU_FAMILY = arc
+else ifeq ($(BR2_arm)$(BR2_armeb),y)
+PKG_MESON_TARGET_CPU_FAMILY = arm
+else ifeq ($(BR2_aarch64)$(BR2_aarch64_be),y)
+PKG_MESON_TARGET_CPU_FAMILY = aarch64
+else ifeq ($(BR2_i386),y)
+PKG_MESON_TARGET_CPU_FAMILY = x86
+else ifeq ($(BR2_mips)$(BR2_mipsel),y)
+PKG_MESON_TARGET_CPU_FAMILY = mips
+else ifeq ($(BR2_mips64)$(BR2_mips64el),y)
+PKG_MESON_TARGET_CPU_FAMILY = mips64
+else ifeq ($(BR2_powerpc),y)
+PKG_MESON_TARGET_CPU_FAMILY = ppc
+else ifeq ($(BR2_powerpc64)$(BR2_powerpc64le),y)
+PKG_MESON_TARGET_CPU_FAMILY = ppc64
+else ifeq ($(BR2_riscv),y)
+PKG_MESON_TARGET_CPU_FAMILY = riscv64
+else ifeq ($(BR2_sparc),y)
+PKG_MESON_TARGET_CPU_FAMILY = sparc
+else ifeq ($(BR2_sparc64),y)
+PKG_MESON_TARGET_CPU_FAMILY = sparc64
+else ifeq ($(BR2_x86_64),y)
+PKG_MESON_TARGET_CPU_FAMILY = x86_64
+else
+PKG_MESON_TARGET_CPU_FAMILY = $(ARCH)
+endif
+
+# Generates sed patterns for patching the cross-compilation.conf template,
+# since Flags might contain commas the arguments are passed indirectly by
+# variable name (stripped to deal with whitespaces).
+# Aruments are variable containing cflags, cxxflags, ldflags.
+define PKG_MESON_CROSSCONFIG_SED
+        -e "s%@TARGET_CROSS@%$(TARGET_CROSS)%g" \
+        -e "s%@TARGET_CC@%$(TARGET_CC)%g" \
+        -e "s%@TARGET_CXX@%$(TARGET_CXX)%g" \
+        -e "s%@TARGET_AR@%$(TARGET_AR)%g" \
+        -e "s%@TARGET_STRIP@%$(TARGET_STRIP)%g" \
+        -e "s%@TARGET_ARCH@%$(PKG_MESON_TARGET_CPU_FAMILY)%g" \
+        -e "s%@TARGET_CPU@%$(GCC_TARGET_CPU)%g" \
+        -e "s%@TARGET_ENDIAN@%$(call LOWERCASE,$(BR2_ENDIAN))%g" \
+        -e "s%@TARGET_CFLAGS@%$(call make-sq-comma-list,$($(strip $(1))))%g" \
+        -e "s%@TARGET_LDFLAGS@%$(call make-sq-comma-list,$($(strip $(3))))%g" \
+        -e "s%@TARGET_CXXFLAGS@%$(call make-sq-comma-list,$($(strip $(2))))%g" \
+        -e "s%@HOST_DIR@%$(HOST_DIR)%g" \
+        -e "s%@PKG_CONFIG_HOST_BINARY@%$(PKG_CONFIG_HOST_BINARY)%g" \
+        -e "s%@STAGING_DIR@%$(STAGING_DIR)%g" \
+        -e 's%@STATIC@%$(if $(BR2_STATIC_LIBS),true,false)%g' \
+        $(TOPDIR)/support/misc/cross-compilation.conf.in
+endef
+
 # Generate a Meson cross-compilation.conf suitable for use with the
 # SDK; also install the file as a template for users to add their
 # own flags if they need to.
 define PKG_MESON_INSTALL_CROSS_CONF
 	mkdir -p $(HOST_DIR)/etc/meson
-	sed -e 's%@TARGET_CROSS@%$(TARGET_CROSS)%g' \
-	    -e 's%@TARGET_ARCH@%$(HOST_MESON_TARGET_CPU_FAMILY)%g' \
-	    -e 's%@TARGET_CPU@%$(HOST_MESON_TARGET_CPU)%g' \
-	    -e 's%@TARGET_ENDIAN@%$(HOST_MESON_TARGET_ENDIAN)%g' \
-	    -e "s%@TARGET_CFLAGS@%$(call make-sq-comma-list,$(TARGET_CFLAGS))@PKG_TARGET_CFLAGS@%g" \
+	sed -e "s%@TARGET_CFLAGS@%$(call make-sq-comma-list,$(TARGET_CFLAGS))@PKG_TARGET_CFLAGS@%g" \
 	    -e "s%@TARGET_LDFLAGS@%$(call make-sq-comma-list,$(TARGET_LDFLAGS))@PKG_TARGET_CFLAGS@%g" \
 	    -e "s%@TARGET_CXXFLAGS@%$(call make-sq-comma-list,$(TARGET_CXXFLAGS))@PKG_TARGET_CFLAGS@%g" \
-	    -e 's%@HOST_DIR@%$(HOST_DIR)%g' \
-	    -e 's%@STAGING_DIR@%$(STAGING_DIR)%g' \
-	    -e 's%@STATIC@%$(if $(BR2_STATIC_LIBS),true,false)%g' \
-	    $(HOST_MESON_PKGDIR)/cross-compilation.conf.in \
+	    $(call PKG_MESON_CROSSCONFIG_SED) \
 	    > $(HOST_DIR)/etc/meson/cross-compilation.conf.in
-	sed -e 's%@PKG_TARGET_CFLAGS@%%g' \
-	    -e 's%@PKG_TARGET_LDFLAGS@%%g' \
-	    -e 's%@PKG_TARGET_CXXFLAGS@%%g' \
-	    $(HOST_DIR)/etc/meson/cross-compilation.conf.in \
+	sed $(call PKG_MESON_CROSSCONFIG_SED,TARGET_CFLAGS,TARGET_CXXFLAGS,TARGET_LDFLAGS) \
 	    > $(HOST_DIR)/etc/meson/cross-compilation.conf
 endef
 
diff --git a/package/meson/cross-compilation.conf.in b/support/misc/cross-compilation.conf.in
similarity index 100%
rename from package/meson/cross-compilation.conf.in
rename to support/misc/cross-compilation.conf.in
-- 
2.28.0