toolchain: skip gcc/minimal for musl

No extra libc header build step is done, so no extra toolchain is needed
for preparing it.
This saves a significant amount of build time and disk space

Signed-off-by: Felix Fietkau <nbd@nbd.name>

toolchain/Makefile

@@ -24,33 +24,42 @@
 # 8) toolchain/libc/utils/install
 #    build & install libc utilities
 #
+# For musl, steps 2 and 4 are skipped, and step 3 is done after 5
 
 curdir:=toolchain
 
 # subdirectories to descend into
-$(curdir)/builddirs := $(if $(CONFIG_GDB),gdb) $(if $(CONFIG_INSIGHT),insight) $(if $(CONFIG_EXTERNAL_TOOLCHAIN),wrapper,kernel-headers binutils gcc/minimal gcc/initial gcc/final $(LIBC)/headers $(LIBC) fortify-headers)
+$(curdir)/builddirs := $(if $(CONFIG_GDB),gdb) $(if $(CONFIG_INSIGHT),insight) $(if $(CONFIG_EXTERNAL_TOOLCHAIN),wrapper,kernel-headers binutils gcc/initial gcc/final $(LIBC) fortify-headers)
 ifdef CONFIG_USE_UCLIBC
   $(curdir)/builddirs += $(LIBC)/utils
 endif
-$(curdir)/builddirs-compile:=$($(curdir)/builddirs-prepare)
-$(curdir)/builddirs-install:=$($(curdir)/builddirs-compile)
 
 # builddir dependencies
 ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
-  $(curdir)/gcc/minimal/compile:=$(curdir)/binutils/install
+  ifdef CONFIG_USE_MUSL
-  $(curdir)/kernel-headers/install:=$(curdir)/gcc/minimal/install
+    $(curdir)/kernel-headers/compile:=$(curdir)/gcc/initial/install
-  $(curdir)/gcc/initial/prepare:=$(curdir)/gcc/minimal/prepare
+    $(curdir)/$(LIBC)/compile:=$(curdir)/kernel-headers/install
-  $(curdir)/gcc/final/prepare:=$(curdir)/gcc/initial/prepare
+  else
+    $(curdir)/builddirs += $(LIBC)/headers gcc/minimal
+    $(curdir)/gcc/minimal/compile:=$(curdir)/binutils/install
+    $(curdir)/kernel-headers/compile:=$(curdir)/gcc/minimal/install
+    $(curdir)/gcc/initial/prepare:=$(curdir)/gcc/minimal/prepare
+    $(curdir)/$(LIBC)/prepare:=$(curdir)/$(LIBC)/headers/prepare
+    $(curdir)/$(LIBC)/headers/compile:=$(curdir)/kernel-headers/install
+    $(curdir)/gcc/initial/compile:=$(curdir)/$(LIBC)/headers/install
+  endif
 
-  $(curdir)/$(LIBC)/headers/compile:=$(curdir)/kernel-headers/install
+  $(curdir)/gcc/initial/compile+=$(curdir)/binutils/install
-  $(curdir)/gcc/initial/compile:=$(curdir)/$(LIBC)/headers/install
+  $(curdir)/gcc/final/prepare:=$(curdir)/gcc/initial/prepare
   $(curdir)/$(LIBC)/compile:=$(curdir)/gcc/initial/install
   $(curdir)/gcc/final/compile:=$(curdir)/$(LIBC)/install
   $(curdir)/$(LIBC)/utils/compile:=$(curdir)/gcc/final/install
-  $(curdir)/$(LIBC)/prepare:=$(curdir)/$(LIBC)/headers/prepare
   $(curdir)/$(LIBC)/utils/prepare:=$(curdir)/$(LIBC)/headers/prepare
 endif
 
+$(curdir)/builddirs-compile:=$($(curdir)/builddirs-prepare)
+$(curdir)/builddirs-install:=$($(curdir)/builddirs-compile)
+
 ifndef DUMP_TARGET_DB
 ifneq ($(ARCH),)
   $(TOOLCHAIN_DIR)/info.mk: .config

toolchain/gcc/common.mk

@@ -170,10 +170,30 @@ GCC_MAKE:= \
 		CFLAGS_FOR_TARGET="$(TARGET_CFLAGS)" \
 		CXXFLAGS_FOR_TARGET="$(TARGET_CFLAGS)"
 
-define Host/Prepare
+define Host/SetToolchainInfo
-	mkdir -p $(GCC_BUILD_DIR)
+	$(SED) 's,TARGET_CROSS=.*,TARGET_CROSS=$(REAL_GNU_TARGET_NAME)-,' $(TOOLCHAIN_DIR)/info.mk
+	$(SED) 's,GCC_VERSION=.*,GCC_VERSION=$(GCC_VERSION),' $(TOOLCHAIN_DIR)/info.mk
 endef
 
+ifneq ($(GCC_PREPARE),)
+  define Host/Prepare
+	$(call Host/SetToolchainInfo)
+	$(call Host/Prepare/Default)
+	ln -snf $(GCC_DIR) $(BUILD_DIR_TOOLCHAIN)/$(PKG_NAME)
+	$(CP) $(SCRIPT_DIR)/config.{guess,sub} $(HOST_SOURCE_DIR)/
+	$(SED) 's,^MULTILIB_OSDIRNAMES,# MULTILIB_OSDIRNAMES,' $(HOST_SOURCE_DIR)/gcc/config/*/t-*
+	$(SED) 'd' $(HOST_SOURCE_DIR)/gcc/DEV-PHASE
+	$(SED) 's, DATESTAMP,,' $(HOST_SOURCE_DIR)/gcc/version.c
+	#(cd $(HOST_SOURCE_DIR)/libstdc++-v3; autoconf;);
+	$(SED) 's,gcc_no_link=yes,gcc_no_link=no,' $(HOST_SOURCE_DIR)/libstdc++-v3/configure
+	mkdir -p $(GCC_BUILD_DIR)
+  endef
+else
+  define Host/Prepare
+	mkdir -p $(GCC_BUILD_DIR)
+  endef
+endif
+
 define Host/Configure
 	(cd $(GCC_BUILD_DIR) && rm -f config.cache; \
 		$(GCC_CONFIGURE) \
@@ -181,7 +201,7 @@ define Host/Configure
 endef
 
 define Host/Clean
-	rm -rf \
+	rm -rf $(if $(GCC_PREPARE),$(HOST_SOURCE_DIR)) \
 		$(STAGING_DIR_HOST)/stamp/.gcc_* \
 		$(STAGING_DIR_HOST)/stamp/.binutils_* \
 		$(GCC_BUILD_DIR) \

toolchain/gcc/initial/Makefile

@@ -1,4 +1,5 @@
 GCC_VARIANT:=initial
+GCC_PREPARE=$(CONFIG_USE_MUSL)
 
 include ../common.mk
 
@@ -10,7 +11,6 @@ GCC_CONFIGURE += \
 	--disable-threads \
 
 define Host/Compile
-	$(CP) $(BUILD_DIR_TOOLCHAIN)/linux-dev/* $(BUILD_DIR_TOOLCHAIN)/$(LIBC)-dev/
 	+$(GCC_MAKE) $(HOST_JOBS) -C $(GCC_BUILD_DIR) \
 		all-build-libiberty \
 		all-gcc \

toolchain/gcc/minimal/Makefile

@@ -1,4 +1,5 @@
 GCC_VARIANT:=minimal
+GCC_PREPARE=$(if $(CONFIG_USE_MUSL),,1)
 
 include ../common.mk
 
@@ -11,24 +12,6 @@ GCC_CONFIGURE += \
 	--disable-shared \
 	--disable-threads
 
-define Host/SetToolchainInfo
-	$(SED) 's,TARGET_CROSS=.*,TARGET_CROSS=$(REAL_GNU_TARGET_NAME)-,' $(TOOLCHAIN_DIR)/info.mk
-	$(SED) 's,GCC_VERSION=.*,GCC_VERSION=$(GCC_VERSION),' $(TOOLCHAIN_DIR)/info.mk
-endef
-
-define Host/Prepare
-	$(call Host/SetToolchainInfo)
-	$(call Host/Prepare/Default)
-	ln -snf $(GCC_DIR) $(BUILD_DIR_TOOLCHAIN)/$(PKG_NAME)
-	$(CP) $(SCRIPT_DIR)/config.{guess,sub} $(HOST_BUILD_DIR)/
-	$(SED) 's,^MULTILIB_OSDIRNAMES,# MULTILIB_OSDIRNAMES,' $(HOST_BUILD_DIR)/gcc/config/*/t-*
-	$(SED) 'd' $(HOST_BUILD_DIR)/gcc/DEV-PHASE
-	$(SED) 's, DATESTAMP,,' $(HOST_BUILD_DIR)/gcc/version.c
-	#(cd $(HOST_BUILD_DIR)/libstdc++-v3; autoconf;);
-	$(SED) 's,gcc_no_link=yes,gcc_no_link=no,' $(HOST_BUILD_DIR)/libstdc++-v3/configure
-	mkdir -p $(GCC_BUILD_DIR)
-endef
-
 define Host/Compile
 	+$(GCC_MAKE) $(HOST_JOBS) -C $(GCC_BUILD_DIR) all-gcc all-target-libgcc
 endef

toolchain/glibc/headers/Makefile

@@ -15,6 +15,7 @@ define Host/Install
 		install_root="$(BUILD_DIR_TOOLCHAIN)/$(LIBC)-dev" \
 		install-bootstrap-headers=yes \
 		install-headers
+	$(CP) $(BUILD_DIR_TOOLCHAIN)/linux-dev/* $(BUILD_DIR_TOOLCHAIN)/$(LIBC)-dev/
 	$(MAKE) -C $(CUR_BUILD_DIR) \
 		csu/subdir_lib
 	( cd $(CUR_BUILD_DIR); \

toolchain/musl/headers/Makefile

@@ -1,16 +0,0 @@
-PATH_PREFIX:=..
-
-include ../common.mk
-
-HOST_STAMP_BUILT:=$(HOST_BUILD_DIR)/.headers_built
-HOST_STAMP_INSTALLED:=$(TOOLCHAIN_DIR)/stamp/.uclibc_headers_installed
-
-define Host/Compile
-
-endef
-
-define Host/Install
-endef
-
-$(eval $(call HostBuild))
-

toolchain/uClibc/headers/Makefile

@@ -20,6 +20,7 @@ define Host/Install
 		ARCH="$(CONFIG_ARCH)" \
 		pregen \
 		install_headers
+	$(CP) $(BUILD_DIR_TOOLCHAIN)/linux-dev/* $(BUILD_DIR_TOOLCHAIN)/$(LIBC)-dev/
 endef
 
 $(eval $(call HostBuild))