enable shared libgcc for uClibc/glibc

unfortunately uClibc/glibc uses dlopen to access exception
handling code from libgcc_s.so.1. Pure static build is only
provided by musl.

package/glibc/Makefile

@@ -38,6 +38,13 @@ ifneq ($(ADK_TARGET_USE_STATIC_LIBS),y)
 		$(CP) $(STAGING_TARGET_DIR)/lib/$$file.so* $(IDIR_GLIBC)/$(ADK_TARGET_LIBC_PATH); \
 		$(CP) $(STAGING_TARGET_DIR)/lib/$$file-$(PKG_VERSION).so $(IDIR_GLIBC)/$(ADK_TARGET_LIBC_PATH); \
 	done
+else
+	# libnss_* required at runtime even for static builds
+	${INSTALL_DIR} ${IDIR_GLIBC}/$(ADK_TARGET_LIBC_PATH)
+	for file in libnss_dns libnss_files; do \
+		$(CP) $(STAGING_TARGET_DIR)/lib/$$file.so* $(IDIR_GLIBC)/$(ADK_TARGET_LIBC_PATH); \
+		$(CP) $(STAGING_TARGET_DIR)/lib/$$file-$(PKG_VERSION).so $(IDIR_GLIBC)/$(ADK_TARGET_LIBC_PATH); \
+	done
 endif
 	${INSTALL_DIR} $(IDIR_GLIBC)/usr/bin
 	$(CP) $(STAGING_TARGET_DIR)/usr/bin/getconf $(IDIR_GLIBC)/usr/bin

package/libgcc/Makefile

@@ -0,0 +1,42 @@
+# This file is part of the OpenADK project. OpenADK is copyrighted
+# material, please see the LICENCE file in the top-level directory.
+
+include ${ADK_TOPDIR}/rules.mk
+
+ifeq ($(ADK_TARGET_LIB_GLIBC),y)
+include ${ADK_TOPDIR}/toolchain/glibc/Makefile.inc
+endif
+ifeq ($(ADK_TARGET_LIB_UCLIBC),y)
+include ${ADK_TOPDIR}/toolchain/uclibc/Makefile.inc
+endif
+
+PKG_NAME:=		libgcc
+PKG_DESCR:=		gcc library
+PKG_SECTION:=		base/libs
+PKG_OPTS:=		noremove
+
+PKG_DFLT_LIBGCC:=	y if !(ADK_TOOLCHAIN_ONLY)
+PKG_LIBC_DEPENDS:=	uclibc glibc
+
+
+NO_DISTFILES:=		1
+
+include ${ADK_TOPDIR}/mk/package.mk
+
+$(eval $(call PKG_template,LIBGCC,libgcc,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION},${PKG_OPTS}))
+
+CONFIG_STYLE:=		manual
+BUILD_STYLE:=		manual
+INSTALL_STYLE:=		manual
+
+libgcc-install:
+	$(INSTALL_DIR) ${IDIR_LIBGCC}/$(ADK_TARGET_LIBC_PATH)
+ifeq ($(ADK_LINUX_SH),y)
+ifeq ($(ADK_TARGET_LIB_GLIBC),)
+	${CP} ${STAGING_TARGET_DIR}/lib/m4-nofpu/libgcc*.so* ${IDIR_LIBGCC}/$(ADK_TARGET_LIBC_PATH)
+endif
+else
+	${CP} ${STAGING_TARGET_DIR}/lib/libgcc*.so* ${IDIR_LIBGCC}/$(ADK_TARGET_LIBC_PATH)
+endif
+
+include ${ADK_TOPDIR}/mk/pkg-bottom.mk

target/config/Config.in.toolchain

@@ -130,6 +130,8 @@ config ADK_TARGET_USE_STATIC_LIBS
 	default n
 	select BUSYBOX_STATIC
 	help
-	  Useful for debugging of dynamic linker problems.
+	  Useful for debugging of dynamic linker problems. Be aware of the fact, that uClibc and glibc
+	  still requires libgcc_so.so.1 for pthread_cancel. Glibc also requires libnss_*.so libraries
+	  at runtime. Full static builds are only supported for musl libc.
 
 endmenu

toolchain/gcc/Makefile

@@ -10,10 +10,6 @@ ifeq ($(ADK_TARGET_LIB_MUSL),y)
 TARGET_CXXFLAGS:=	$(filter-out -fstack-protector-all,$(TARGET_CXXFLAGS))
 endif
 
-ifneq ($(ADK_LINUX_XTENSA),y)
-GCC_FINAL_CONFOPTS+=	--enable-cxx-flags='$(TARGET_CXXFLAGS)'
-endif
-
 GCC_CONFOPTS:=		--prefix=$(TOOLCHAIN_DIR)/usr \
 			--with-bugurl="http://www.openadk.org/" \
 			--build=$(GNU_HOST_NAME) \
@@ -42,6 +38,18 @@ GCC_CONFOPTS:=		--prefix=$(TOOLCHAIN_DIR)/usr \
 			--disable-nls
 
 GCC_FINAL_CONFOPTS:=
+
+ifneq ($(ADK_LINUX_XTENSA),y)
+GCC_FINAL_CONFOPTS+=	--enable-cxx-flags='$(TARGET_CXXFLAGS)'
+endif
+
+# uClibc/glibc uses libgcc_s.so.1 for pthread_cancel with dlopen
+ifeq (ADK_TARGET_LIB_MUSL),y)
+GCC_FINAL_CONFOPTS+=	--enable-shared='libstdc++'
+else
+GCC_FINAL_CONFOPTS+=	--enable-shared='libstdc++,libgcc'
+endif
+
 ifeq ($(ADK_LINUX_SH)$(ADK_LINUX_X86_64)$(ADK_LINUX_X86),)
 GCC_FINAL_CONFOPTS+=	--disable-biarch --disable-multilib
 endif
@@ -102,7 +110,7 @@ endif
 endif
 
 ifeq ($(ADK_CPU_ARM926EJ_S),y)
-GCC_CONFOPTS+=		--with-arch=armv5te --with-tune=arm1176jzf-s
+GCC_CONFOPTS+=		--with-arch=armv5te --with-tune=arm926ej-s
 endif
 
 ifeq ($(ADK_CPU_ARM1176JZF_S),y)
@@ -205,8 +213,7 @@ $(GCC_BUILD_DIR_FINAL)/.configured:
 			${GCC_FINAL_CONFOPTS} \
 			--enable-languages=$(LANGUAGES) \
 			--with-build-sysroot='$${prefix}/${STAGING_HOST2TARGET}' \
-			--with-sysroot='$${prefix}/${STAGING_HOST2TARGET}' \
-			--enable-shared='libstdc++'
+			--with-sysroot='$${prefix}/${STAGING_HOST2TARGET}'
 	touch $@
 
 $(WRKBUILD)/.compiled: $(GCC_BUILD_DIR_FINAL)/.configured

toolchain/uclibc/patches/xxx-disable-gcc_eh.patch

@@ -0,0 +1,14 @@
+diff -Nur uClibc-0.9.33.2.orig/Rules.mak uClibc-0.9.33.2/Rules.mak
+--- uClibc-0.9.33.2.orig/Rules.mak	2014-06-28 12:12:25.000000000 +0200
++++ uClibc-0.9.33.2/Rules.mak	2014-06-28 12:14:15.000000000 +0200
+@@ -819,10 +819,7 @@
+ LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
+ $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
+ $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
+-# with -O0 we (e.g. lockf) might end up with references to
+-# _Unwind_Resume, so pull in gcc_eh in this case..
+ LIBGCC_DIR:=$(dir $(LIBGCC))
+-LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
+ 
+ # moved from libpthread/linuxthreads
+ ifeq ($(UCLIBC_CTOR_DTOR),y)

toolchain/uclibc/patches/xxx-remove-duplicate-symbols-arm.patch

@@ -1,122 +0,0 @@
-diff -Nur uClibc-0.9.33.2.orig/libc/sysdeps/linux/arm/Makefile.arch uClibc-0.9.33.2/libc/sysdeps/linux/arm/Makefile.arch
---- uClibc-0.9.33.2.orig/libc/sysdeps/linux/arm/Makefile.arch	2014-05-23 15:42:33.000000000 +0200
-+++ uClibc-0.9.33.2/libc/sysdeps/linux/arm/Makefile.arch	2014-05-23 15:53:57.000000000 +0200
-@@ -40,5 +40,4 @@
- 	aeabi_lcsts.os \
- 	aeabi_math.os \
- 	aeabi_sighandlers.os \
--	aeabi_unwind_cpp_pr1.o \
- 	)
-diff -Nur uClibc-0.9.33.2.orig/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c uClibc-0.9.33.2/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
---- uClibc-0.9.33.2.orig/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c	2014-05-23 15:42:33.000000000 +0200
-+++ uClibc-0.9.33.2/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c	2014-05-23 20:40:14.000000000 +0200
-@@ -97,6 +97,7 @@
-     }
- }
- 
-+/*
- void
- _Unwind_Resume (struct _Unwind_Exception *exc)
- {
-@@ -107,6 +108,7 @@
-   PTR_DEMANGLE (resume);
-   resume (exc);
- }
-+*/
- 
- _Unwind_Reason_Code
- __gcc_personality_v0 (int version, _Unwind_Action actions,
-@@ -129,6 +131,7 @@
-   return personality (version, actions, exception_class, ue_header, context);
- }
- 
-+/*
- _Unwind_Reason_Code
- _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
- 		      void *stop_argument)
-@@ -153,3 +156,4 @@
-   PTR_DEMANGLE (getcfa);
-   return getcfa (context);
- }
-+*/
-diff -Nur uClibc-0.9.33.2.orig/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-resume.c uClibc-0.9.33.2/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-resume.c
---- uClibc-0.9.33.2.orig/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-resume.c	2014-05-23 15:42:33.000000000 +0200
-+++ uClibc-0.9.33.2/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-resume.c	2014-05-23 21:08:02.000000000 +0200
-@@ -47,62 +47,6 @@
-   libgcc_s_resume = resume;
-   libgcc_s_personality = personality;
- }
--#ifdef __thumb__
--void
--_Unwind_Resume (struct _Unwind_Exception *exc)
--{
--  if (__builtin_expect (libgcc_s_resume == NULL, 0))
--    init ();
--  libgcc_s_resume (exc);
--}
--#else
--/* It's vitally important that _Unwind_Resume not have a stack frame; the
--   ARM unwinder relies on register state at entrance.  So we write this in
--   assembly.  */
--
--__asm__ (
--"	.globl	_Unwind_Resume\n"
--"	.type	_Unwind_Resume, %function\n"
--"_Unwind_Resume:\n"
--"	" CFI_SECTIONS (.debug_frame) "\n"
--"	" CFI_STARTPROC "\n"
--"	stmfd	sp!, {r4, r5, r6, lr}\n"
--"	" CFI_ADJUST_CFA_OFFSET (16)" \n"
--"	" CFI_REL_OFFSET (r4, 0) "\n"
--"	" CFI_REL_OFFSET (r5, 4) "\n"
--"	" CFI_REL_OFFSET (r6, 8) "\n"
--"	" CFI_REL_OFFSET (lr, 12) "\n"
--"	" CFI_REMEMBER_STATE "\n"
--"	ldr	r4, 1f\n"
--"	ldr	r5, 2f\n"
--"3:	add	r4, pc, r4\n"
--"	ldr	r3, [r4, r5]\n"
--"	mov	r6, r0\n"
--"	cmp	r3, #0\n"
--"	beq	4f\n"
--"5:	mov	r0, r6\n"
--"	ldmfd	sp!, {r4, r5, r6, lr}\n"
--"	" CFI_ADJUST_CFA_OFFSET (-16) "\n"
--"	" CFI_RESTORE (r4) "\n"
--"	" CFI_RESTORE (r5) "\n"
--"	" CFI_RESTORE (r6) "\n"
--"	" CFI_RESTORE (lr) "\n"
--"	bx	r3\n"
--"	" CFI_RESTORE_STATE "\n"
--"4:	bl	init\n"
--"	ldr	r3, [r4, r5]\n"
--"	b	5b\n"
--"	" CFI_ENDPROC "\n"
--"	.align 2\n"
--#ifdef __thumb2__
--"1:	.word	_GLOBAL_OFFSET_TABLE_ - 3b - 4\n"
--#else
--"1:	.word	_GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
--#endif
--"2:	.word	libgcc_s_resume(GOTOFF)\n"
--"	.size	_Unwind_Resume, .-_Unwind_Resume\n"
--);
--#endif
- 
- _Unwind_Reason_Code
- __gcc_personality_v0 (_Unwind_State state,
-diff -Nur uClibc-0.9.33.2.orig/Rules.mak uClibc-0.9.33.2/Rules.mak
---- uClibc-0.9.33.2.orig/Rules.mak	2014-05-23 15:42:33.000000000 +0200
-+++ uClibc-0.9.33.2/Rules.mak	2014-05-23 20:13:43.000000000 +0200
-@@ -818,11 +818,7 @@
- 
- LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
- $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
--$(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
--# with -O0 we (e.g. lockf) might end up with references to
--# _Unwind_Resume, so pull in gcc_eh in this case..
- LIBGCC_DIR:=$(dir $(LIBGCC))
--LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
- 
- # moved from libpthread/linuxthreads
- ifeq ($(UCLIBC_CTOR_DTOR),y)