toolchain: include yasm in x86 toolchain

Some libraries require yasm to build with in-line assembly for x86
targets.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

toolchain/Config.in

@@ -206,6 +206,14 @@ comment "Compiler"
 
 source "toolchain/gcc/Config.in"
 
+config YASM
+	bool
+	depends on ( i386 || x86_64 )
+	prompt "Build yasm" if TOOLCHAINOPTS
+	default y
+	help
+	  Enable if you want to build yasm
+
 comment "C Library"
 	depends on TOOLCHAINOPTS
 

toolchain/Makefile

@@ -29,7 +29,7 @@
 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/initial gcc/final $(LIBC) fortify-headers)
+$(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) $(if $(CONFIG_YASM),yasm)
 ifdef CONFIG_USE_UCLIBC
   $(curdir)/builddirs += $(LIBC)/utils
 endif

toolchain/yasm/Makefile

@@ -0,0 +1,63 @@
+#
+# Copyright (C) 2016 Daniel Golle <daniel@makrotopia.org>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=yasm
+PKG_VERSION:=1.3.0
+
+PKG_SOURCE_URL:=http://www.tortall.net/projects/yasm/releases/
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+
+PKG_MD5SUM:=fc9e586751ff789b34b1f21d572d96af
+
+HOST_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/toolchain-build.mk
+
+YASM_CONFIGURE:= \
+	./configure \
+		--prefix=$(TOOLCHAIN_DIR) \
+		--build=$(GNU_HOST_NAME) \
+		--host=$(GNU_HOST_NAME) \
+		--target=$(REAL_GNU_TARGET_NAME) \
+		--with-sysroot=$(TOOLCHAIN_DIR) \
+		--disable-multilib \
+		--disable-werror \
+		--disable-nls \
+		--disable-sim \
+		--disable-gdb \
+		$(SOFT_FLOAT_CONFIG_OPTION) \
+
+define Host/Prepare
+	$(call Host/Prepare/Default)
+	ln -snf $(notdir $(HOST_BUILD_DIR)) $(BUILD_DIR_TOOLCHAIN)/$(PKG_NAME)
+	$(CP) $(SCRIPT_DIR)/config.{guess,sub} $(HOST_BUILD_DIR)/
+endef
+
+define Host/Configure
+	(cd $(HOST_BUILD_DIR); \
+		$(YASM_CONFIGURE) \
+	);
+endef
+
+define Host/Compile
+	+$(MAKE) $(HOST_JOBS) -C $(HOST_BUILD_DIR) all
+endef
+
+define Host/Install
+	$(MAKE) -C $(HOST_BUILD_DIR) \
+		prefix=$(TOOLCHAIN_DIR) \
+		install
+endef
+
+define Host/Clean
+	rm -rf \
+		$(HOST_BUILD_DIR) \
+		$(BUILD_DIR_TOOLCHAIN)/$(PKG_NAME)
+endef
+
+$(eval $(call HostBuild))