toolchain: add newlib support

OpenADK can now build bare-metal toolchains.
Tested for ARM/MIPS. No runtime testing, yet.

mk/vars.mk

@@ -75,6 +75,9 @@ GNU_TARGET_NAME:=	$(ADK_TARGET_CPU_ARCH)-$(ADK_VENDOR)-$(ADK_TARGET_LINUXTYPE)-$
 ifeq ($(ADK_TARGET_ARCH_C6X),y)
 GNU_TARGET_NAME:=	$(ADK_TARGET_CPU_ARCH)-$(ADK_TARGET_LINUXTYPE)
 endif
+ifeq ($(ADK_TARGET_LIB_NEWLIB),y)
+GNU_TARGET_NAME:=	$(ADK_TARGET_CPU_ARCH)-$(ADK_VENDOR)-$(ADK_TARGET_SUFFIX)
+endif
 TARGET_CROSS:=		$(TOOLCHAIN_DIR)/usr/bin/$(GNU_TARGET_NAME)-
 TARGET_COMPILER_PREFIX?=${TARGET_CROSS}
 CONFIGURE_TRIPLE:=	--build=${GNU_HOST_NAME} \

target/config/Config.in.libc

@@ -47,6 +47,13 @@ config ADK_TARGET_LIB_GLIBC
 	help
 	  http://www.gnu.org/libc
 
+config ADK_TARGET_LIB_NEWLIB
+	bool "newlib C library"
+	select ADK_TARGET_WITHOUT_CXX
+	select ADK_TARGET_LIB_WITHOUT_THREADS
+	help
+	  https://sourceware.org/newlib/
+
 endchoice
 
 choice
@@ -103,11 +110,20 @@ config ADK_TARGET_LIB_MUSL_GIT
 	bool "git"
 	depends on ADK_TARGET_LIB_MUSL
 
+config ADK_TARGET_LIB_NEWLIB_2_2_0
+	bool "2.2.0"
+	depends on ADK_TARGET_LIB_NEWLIB
+
+config ADK_TARGET_LIB_NEWLIB_GIT
+	bool "git"
+	depends on ADK_TARGET_LIB_NEWLIB
+
 endchoice
 
 choice
 prompt "Threading"
 depends on ADK_TARGET_LIB_UCLIBC_NG && !ADK_TARGET_WITHOUT_THREADS
+depends on ADK_TARGET_LIB_NEWLIB
 
 config ADK_TARGET_LIB_WITH_THREADS
 	bool "enable threads"
@@ -134,6 +150,7 @@ config ADK_TARGET_LIBC
 	default "uclibc-ng" if ADK_TARGET_LIB_UCLIBC_NG
 	default "glibc" if ADK_TARGET_LIB_GLIBC
 	default "musl" if ADK_TARGET_LIB_MUSL
+	default "newlib" if ADK_TARGET_LIB_NEWLIB
 
 config ADK_LIBC_VERSION
 	string
@@ -146,9 +163,11 @@ config ADK_LIBC_VERSION
 	default "2.22" if ADK_TARGET_LIB_GLIBC_2_22
 	default "2.21" if ADK_TARGET_LIB_GLIBC_2_21
 	default "2.20" if ADK_TARGET_LIB_GLIBC_2_20
+	default "2.2.0" if ADK_TARGET_LIB_NEWLIB_2_2_0
 	default "git" if ADK_TARGET_LIB_UCLIBC_NG_GIT || \
 		         ADK_TARGET_LIB_MUSL_GIT || \
-		         ADK_TARGET_LIB_GLIBC_GIT
+		         ADK_TARGET_LIB_GLIBC_GIT || \
+			 ADK_TARGET_LIB_NEWLIB_GIT
 
 config ADK_TARGET_LIB_UCLIBC_NG_1_0
 	bool
@@ -181,3 +200,5 @@ config ADK_TARGET_SUFFIX
 	default "musl32" if ADK_TARGET_LIB_MUSL && ADK_TARGET_ABI_32 && ADK_LINUX_64
 	default "muslx32" if ADK_TARGET_LIB_MUSL && ADK_TARGET_ABI_X32 && ADK_LINUX_64
 	default "musl" if ADK_TARGET_LIB_MUSL
+	default "eabi" if ADK_TARGET_LIB_NEWLIB && ADK_TARGET_ARCH_ARM
+	default "elf" if ADK_TARGET_LIB_NEWLIB

toolchain/Makefile

@@ -26,6 +26,10 @@ ifeq ($(ADK_TARGET_LIB_MUSL),y)
 TARGETS+=musl
 CLIB:=musl
 endif
+ifeq ($(ADK_TARGET_LIB_NEWLIB),y)
+TARGETS+=newlib
+CLIB:=newlib
+endif
 
 ifeq ($(ADK_TARGET_BINFMT_FLAT),y)
 TARGETS+=elf2flt

toolchain/gcc/Makefile

@@ -56,6 +56,10 @@ GCC_CONFOPTS:=		--prefix=$(TOOLCHAIN_DIR)/usr \
 			--without-isl \
 			--disable-nls
 
+ifeq ($(ADK_TARGET_LIB_NEWLIB),y)
+GCC_FINAL_CONFOPTS:=	--with-newlib
+endif
+
 ifeq ($(ADK_TARGET_WITH_NPTL),y)
 GCC_FINAL_CONFOPTS:=	--enable-tls --enable-threads --enable-libatomic
 endif
@@ -255,6 +259,10 @@ else
 	PATH='$(TARGET_PATH)' \
 		$(MAKE) -C $(GCC_BUILD_DIR_INITIAL) install-gcc install-target-libgcc
 endif
+	# required for newlib
+	(cd $(TOOLCHAIN_DIR)/usr/bin && \
+		ln -sf $(GNU_TARGET_NAME)-gcc $(GNU_TARGET_NAME)-cc \
+	)
 ifeq ($(ADK_TARGET_ARCH_M68K),y)
 	# create gcc wrapper for uClinux/m68k
 	echo "#!/bin/sh" > $(TOOLCHAIN_DIR)/usr/bin/adk-uclinux-gcc

toolchain/newlib/Makefile

@@ -0,0 +1,39 @@
+# This file is part of the OpenADK project. OpenADK is copyrighted
+# material, please see the LICENCE file in the top-level directory.
+
+include $(ADK_TOPDIR)/rules.mk
+include ../rules.mk
+include Makefile.inc
+include ${ADK_TOPDIR}/mk/buildhlp.mk
+
+$(WRKBUILD)/.configured:
+	(cd $(WRKBUILD); \
+		CC='' \
+		CFLAGS='' \
+		LDFLAGS='' \
+		have_doc='' \
+		./configure --prefix=/usr \
+		--target=$(GNU_TARGET_NAME) \
+		--enable-newlib-io-long-long \
+		--enable-newlib-register-fini \
+		--disable-newlib-supplied-syscalls \
+		--disable-nls \
+	)
+	touch $@
+
+$(WRKBUILD)/.compiled:
+	PATH='$(HOST_PATH)' $(MAKE) -C $(WRKBUILD) \
+		CC='' \
+		CFLAGS='$(TARGET_CFLAGS)' \
+		all
+	touch $@
+
+$(WRKBUILD)/.installed: $(WRKBUILD)/.compiled
+	PATH='$(HOST_PATH)' $(MAKE) -C $(WRKBUILD) \
+		CC='' \
+		CFLAGS='$(TARGET_CFLAGS)' \
+		DESTDIR=$(STAGING_TARGET_DIR) \
+		install
+	touch $@
+
+include ${ADK_TOPDIR}/mk/toolchain.mk

toolchain/newlib/Makefile.inc

@@ -0,0 +1,18 @@
+# This file is part of the OpenADK project. OpenADK is copyrighted
+# material, please see the LICENCE file in the top-level directory.
+
+PKG_NAME:=		newlib
+ifeq ($(ADK_LIBC_VERSION),git)
+PKG_VERSION:=		git
+PKG_RELEASE:=		1
+PKG_SITES:=		git://sourceware.org/git/newlib-cygwin.git
+DISTFILES:=		${PKG_NAME}-${PKG_VERSION}.tar.xz
+endif
+ifeq ($(ADK_TARGET_LIB_NEWLIB_2_2_0),y)
+PKG_VERSION:=		2.2.0
+PKG_RELEASE:=		1
+PKG_HASH:=		c1d53fd1765d955ac513aa6e2f576455ee7507072d400314495c8a8a26ebc8ec
+PKG_SITES:=		ftp://sourceware.org/pub/newlib/
+DISTFILES:=		${PKG_NAME}-${PKG_VERSION}-1.tar.gz
+WRKDIST=		$(WRKDIR)/${PKG_NAME}-${PKG_VERSION}-1
+endif

toolchain/newlib/patches/2.2.0/disable-docs.patch

@@ -0,0 +1,14 @@
+diff -Nur newlib-2.2.0-1.orig/etc/Makefile.in newlib-2.2.0-1/etc/Makefile.in
+--- newlib-2.2.0-1.orig/etc/Makefile.in	2010-11-20 20:37:57.000000000 +0100
++++ newlib-2.2.0-1/etc/Makefile.in	2015-12-03 14:23:44.043820971 +0100
+@@ -63,8 +63,8 @@
+ PDFFILES = standards.pdf configure.pdf
+ HTMLFILES = standards.html configure.html
+ 
+-all: info
+-install install-strip: install-info
++all:
++install install-strip:
+ 
+ uninstall:
+ 

toolchain/newlib/patches/2.2.0/fix-tooldir.patch

@@ -0,0 +1,12 @@
+diff -Nur newlib-2.2.0-1.orig/configure newlib-2.2.0-1/configure
+--- newlib-2.2.0-1.orig/configure	2014-07-05 23:09:07.000000000 +0200
++++ newlib-2.2.0-1/configure	2015-11-25 06:33:11.461178398 +0100
+@@ -6985,7 +6985,7 @@
+ 
+ # Some systems (e.g., one of the i386-aix systems the gas testers are
+ # using) don't handle "\$" correctly, so don't use it here.
+-tooldir='${exec_prefix}'/${target_noncanonical}
++tooldir='${exec_prefix}'
+ build_tooldir=${tooldir}
+ 
+ # Create a .gdbinit file which runs the one in srcdir