eglibc-2.16: Remove build dependency on libgcc_s and libgcc_eh

This patch backports two patches from glibc trunk essentially
dropping the requirements to have libgcc_s and libgcc_eh
this will simplify the toolchain bootstrap sequence.

(From OE-Core rev: 9591c93c20af236fdc1a99b548435b6df75af497)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 373 insertions, 1 deletions

diff --git a/meta/recipes-core/eglibc/eglibc-2.16/0001-Add-ARM-specific-static-stubs.c.patch b/meta/recipes-core/eglibc/eglibc-2.16/0001-Add-ARM-specific-static-stubs.c.patch
new file mode 100644
index 0000000000..7186f898ee
--- /dev/null
+++ b/meta/recipes-core/eglibc/eglibc-2.16/0001-Add-ARM-specific-static-stubs.c.patch
@@ -0,0 +1,27 @@
+Upstream-Status: Backport
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+From c57a67e03368687fc0d2ae8354cd1b347a61ea44 Mon Sep 17 00:00:00 2001
+From: Joseph Myers <joseph@codesourcery.com>
+Date: Thu, 5 Jul 2012 22:16:03 +0000
+Subject: [PATCH] Add ARM-specific static-stubs.c.
+
+---
+ ports/ChangeLog.arm              |    4 ++++
+ ports/sysdeps/arm/static-stubs.c |    7 +++++++
+ 2 files changed, 11 insertions(+)
+ create mode 100644 ports/sysdeps/arm/static-stubs.c
+
+Index: libc/ports/sysdeps/arm/static-stubs.c
+===================================================================
+--- /dev/null   1970-01-01 00:00:00.000000000 +0000
++++ libc/ports/sysdeps/arm/static-stubs.c       2012-08-15 15:04:59.687669241 -0700
+@@ -0,0 +1,7 @@
++/* When building with GCC with static-only libgcc, the dummy
++   _Unwind_Resume from static-stubs.c needs to be used together with
++   the dummy __aeabi_unwind_cpp_pr* from aeabi_unwind_cpp_pr1.c
++   instead of the copies from libgcc.  */
++
++#include <elf/static-stubs.c>
++#include <aeabi_unwind_cpp_pr1.c>
diff --git a/meta/recipes-core/eglibc/eglibc-2.16/0001-Avoid-use-of-libgcc_s-and-libgcc_eh-when-building-gl.patch b/meta/recipes-core/eglibc/eglibc-2.16/0001-Avoid-use-of-libgcc_s-and-libgcc_eh-when-building-gl.patch
new file mode 100644
index 0000000000..dc35b9bd4a
--- /dev/null
+++ b/meta/recipes-core/eglibc/eglibc-2.16/0001-Avoid-use-of-libgcc_s-and-libgcc_eh-when-building-gl.patch
@@ -0,0 +1,343 @@
+Upstream-Status: Backport
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+From 95f5a9a866695da4e038aa4e6ccbbfd5d9cf63b7 Mon Sep 17 00:00:00 2001
+From: Joseph Myers <joseph@codesourcery.com>
+Date: Tue, 3 Jul 2012 19:14:59 +0000
+Subject: [PATCH] Avoid use of libgcc_s and libgcc_eh when building glibc.
+
+---
+ ChangeLog                  |   47 ++++++++++++++++++++++++++++++
+ Makeconfig                 |   68 ++++++++++++++++++++++++++++++++++++++------
+ Rules                      |   45 ++++++++++++++++++++++-------
+ elf/Makefile               |    6 +++-
+ elf/static-stubs.c         |   46 ++++++++++++++++++++++++++++++
+ ports/ChangeLog.arm        |    7 +++++
+ ports/sysdeps/arm/Makefile |    8 ++++++
+ 7 files changed, 206 insertions(+), 21 deletions(-)
+ create mode 100644 elf/static-stubs.c
+
+Index: libc/Makeconfig
+===================================================================
+--- libc.orig/Makeconfig        2012-07-04 18:26:22.000000000 -0700
++++ libc/Makeconfig     2012-08-14 20:16:10.197093639 -0700
+@@ -415,9 +415,9 @@
+ LDFLAGS-rtld += $(hashstyle-LDFLAGS)
+ endif
+ 
+-# Command for linking programs with the C library.
++# Commands for linking programs with the C library.
+ ifndef +link
+-+link = $(CC) -nostdlib -nostartfiles -o $@ \
+++link-before-libc = $(CC) -nostdlib -nostartfiles -o $@ \
+              $(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
+              $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
+              $(addprefix $(csu-objpfx),$(start-installed-name)) \
+@@ -426,7 +426,10 @@
+                                                     $(start-installed-name))\
+                           $(+preinit) $(link-extra-libs) \
+                           $(common-objpfx)libc% $(+postinit),$^) \
+-             $(link-extra-libs) $(link-libc) $(+postctor) $(+postinit)
++             $(link-extra-libs)
+++link-after-libc = $(+postctor) $(+postinit)
+++link = $(+link-before-libc) $(link-libc) $(+link-after-libc)
+++link-tests = $(+link-before-libc) $(link-libc-tests) $(+link-after-libc)
+ endif
+ # Command for linking PIE programs with the C library.
+ ifndef +link-pie
+@@ -443,7 +446,7 @@
+ endif
+ # Command for statically linking programs with the C library.
+ ifndef +link-static
+-+link-static = $(CC) -nostdlib -nostartfiles -static -o $@ \
+++link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \
+              $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F))  \
+              $(addprefix $(csu-objpfx),$(static-start-installed-name)) \
+              $(+preinit) $(+prector) \
+@@ -451,7 +454,12 @@
+                                                     $(start-installed-name))\
+                           $(+preinit) $(link-extra-libs-static) \
+                           $(common-objpfx)libc% $(+postinit),$^) \
+-             $(link-extra-libs-static) $(link-libc-static) $(+postctor) $(+postinit)
++             $(link-extra-libs-static) $(link-libc-static)
+++link-static-after-libc = $(+postctor) $(+postinit)
+++link-static = $(+link-static-before-libc) $(link-libc-static) \
++              $(+link-static-after-libc)
+++link-static-tests = $(+link-static-before-libc) $(link-libc-static-tests) \
++                    $(+link-static-after-libc)
+ endif
+ # Command for statically linking bounded-pointer programs with the C library.
+ ifndef +link-bounded
+@@ -475,10 +483,12 @@
+ # We need the versioned name of libc.so in the deps of $(others) et al
+ # so that the symlink to libc.so is created before anything tries to
+ # run the linked programs.
+-link-libc = -Wl,-rpath-link=$(rpath-link) \
++link-libc-before-gnulib = -Wl,-rpath-link=$(rpath-link) \
+            $(common-objpfx)libc.so$(libc.so-version) \
+            $(common-objpfx)$(patsubst %,$(libtype.oS),c) \
+-           $(as-needed) $(common-objpfx)elf/ld.so $(no-as-needed) $(gnulib)
++           $(as-needed) $(common-objpfx)elf/ld.so $(no-as-needed)
++link-libc = $(link-libc-before-gnulib) $(gnulib)
++link-libc-tests = $(link-libc-before-gnulib) $(gnulib-tests)
+ # This is how to find at build-time things that will be installed there.
+ rpath-dirs = math elf dlfcn nss nis rt resolv crypt
+ rpath-link = \
+@@ -488,6 +498,7 @@
+ nssobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)nss)
+ resolvobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)resolv)
+ link-libc = $(common-objpfx)libc.a $(otherlibs) $(gnulib) $(common-objpfx)libc.a $(gnulib)
++link-libc-tests = $(common-objpfx)libc.a $(otherlibs) $(gnulib-tests) $(common-objpfx)libc.a $(gnulib-tests)
+ endif
+ endif
+ 
+@@ -513,8 +524,43 @@
+ 
+ # The static libraries.
+ link-libc-static = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib) -Wl,--end-group
++link-libc-static-tests = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib-tests) -Wl,--end-group
+ link-libc-bounded = $(common-objpfx)libc_b.a $(gnulib) $(common-objpfx)libc_b.a
+ 
++# How to link against libgcc.  Some libgcc functions, such as those
++# for "long long" arithmetic or software floating point, can always be
++# built without use of C library headers and do not have any global
++# state so can safely be linked statically into any executable or
++# shared library requiring them; these functions are in libgcc.a.
++# Other functions, relating to exception handling, may require C
++# library headers to build and it may not be safe to have more than
++# one copy of them in a process; these functions are only in
++# libgcc_s.so and libgcc_eh.a.
++#
++# To avoid circular dependencies when bootstrapping, it is desirable
++# to avoid use of libgcc_s and libgcc_eh in building glibc.  Where any
++# glibc functionality (in particular, thread cancellation) requires
++# exception handling, this is implemented through dlopen of libgcc_s
++# to avoid unnecessary dependencies on libgcc_s by programs not using
++# that functionality; executables built with glibc do not use
++# exception handling other than through thread cancellation.
++#
++# Undefined references to functions from libgcc_eh or libgcc_s may
++# arise for code built with -fexceptions.  In the case of statically
++# linked programs installed by glibc, unwinding will never actually
++# occur at runtime and the use of elf/static-stubs.c to resolve these
++# references is safe.  In the case of statically linked test programs
++# and test programs built with -fexceptions, unwinding may occur in
++# some cases and it is preferable to link with libgcc_eh or libgcc_s
++# so that the testing is as similar as possible to how programs will
++# be built with the installed glibc.
++#
++# Some architectures have architecture-specific systems for exception
++# handling that may involve undefined references to
++# architecture-specific functions.  On those architectures,
++# gnulib-arch and static-gnulib-arch may be defined in sysdeps
++# makefiles to use additional libraries for linking executables and
++# shared libraries built by glibc.
+ ifndef gnulib
+ ifneq ($(have-cc-with-libunwind),yes)
+   libunwind =
+@@ -522,8 +568,12 @@
+   libunwind = -lunwind
+ endif
+ libgcc_eh := -Wl,--as-needed -lgcc_s $(libunwind) -Wl,--no-as-needed
+-gnulib := -lgcc $(libgcc_eh)
+-static-gnulib := -lgcc -lgcc_eh $(libunwind)
++gnulib-arch =
++gnulib = -lgcc $(gnulib-arch)
++gnulib-tests := -lgcc $(libgcc_eh)
++static-gnulib-arch =
++static-gnulib = -lgcc $(static-gnulib-arch)
++static-gnulib-tests := -lgcc -lgcc_eh $(libunwind)
+ libc.so-gnulib := -lgcc
+ endif
+ +preinit = $(addprefix $(csu-objpfx),crti.o)
+Index: libc/Rules
+===================================================================
+--- libc.orig/Rules     2012-07-04 18:25:47.000000000 -0700
++++ libc/Rules  2012-08-14 20:16:10.197093639 -0700
+@@ -1,5 +1,4 @@
+-# Copyright (C) 1991-2000,2002,2003,2004,2005,2006,2011
+-#      Free Software Foundation, Inc.
++# Copyright (C) 1991-2012 Free Software Foundation, Inc.
+ # This file is part of the GNU C Library.
+ 
+ # The GNU C Library is free software; you can redistribute it and/or
+@@ -103,29 +102,46 @@
+ # eglibc: endif
+ 
+ ifeq ($(build-programs),yes)
+-binaries-all = $(others) $(sysdep-others) $(tests) $(xtests) $(test-srcs)
+-binaries-static = $(others-static) $(tests-static) $(xtests-static)
++binaries-all-notests = $(others) $(sysdep-others)
++binaries-all-tests = $(tests) $(xtests) $(test-srcs)
++binaries-all = $(binaries-all-notests) $(binaries-all-tests)
++binaries-static-notests = $(others-static)
++binaries-static-tests = $(tests-static) $(xtests-static)
++binaries-static = $(binaries-static-notests) $(binaries-static-tests)
+ ifeq (yesyes,$(have-fpie)$(build-shared))
+ binaries-pie = $(others-pie) $(tests-pie) $(xtests-pie)
+ else
+ binaries-pie =
+ endif
+ else
+-binaries-all = $(tests) $(xtests) $(test-srcs)
++binaries-all-notests =
++binaries-all-tests = $(tests) $(xtests) $(test-srcs)
++binaries-all = $(binaries-all-tests)
++binaries-static-notests =
++binaries-static-tests =
+ binaries-static =
+ binaries-pie =
+ endif
+ 
+-binaries-shared = $(filter-out $(binaries-pie) $(binaries-static), \
+-                              $(binaries-all))
++binaries-shared-tests = $(filter-out $(binaries-pie) $(binaries-static), \
++                                    $(binaries-all-tests))
++binaries-shared-notests = $(filter-out $(binaries-pie) $(binaries-static), \
++                                      $(binaries-all-notests))
+ 
+-ifneq "$(strip $(binaries-shared))" ""
+-$(addprefix $(objpfx),$(binaries-shared)): %: %.o \
++ifneq "$(strip $(binaries-shared-notests))" ""
++$(addprefix $(objpfx),$(binaries-shared-notests)): %: %.o \
+   $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
+   $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
+        $(+link)
+ endif
+ 
++ifneq "$(strip $(binaries-shared-tests))" ""
++$(addprefix $(objpfx),$(binaries-shared-tests)): %: %.o \
++  $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
++  $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
++       $(+link-tests)
++endif
++
+ ifneq "$(strip $(binaries-pie))" ""
+ $(addprefix $(objpfx),$(binaries-pie)): %: %.o \
+   $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
+@@ -133,13 +149,20 @@
+        $(+link-pie)
+ endif
+ 
+-ifneq "$(strip $(binaries-static))" ""
+-$(addprefix $(objpfx),$(binaries-static)): %: %.o \
++ifneq "$(strip $(binaries-static-notests))" ""
++$(addprefix $(objpfx),$(binaries-static-notests)): %: %.o \
+   $(sort $(filter $(common-objpfx)lib%,$(link-libc-static))) \
+   $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
+        $(+link-static)
+ endif
+ 
++ifneq "$(strip $(binaries-static-tests))" ""
++$(addprefix $(objpfx),$(binaries-static-tests)): %: %.o \
++  $(sort $(filter $(common-objpfx)lib%,$(link-libc-static-tests))) \
++  $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
++       $(+link-static-tests)
++endif
++
+ ifeq ($(build-bounded),yes)
+ binaries-bounded = $(addsuffix -bp,$(tests) $(xtests) $(test-srcs))
+ $(addprefix $(objpfx),$(binaries-bounded)): %-bp: %.ob \
+Index: libc/elf/Makefile
+===================================================================
+--- libc.orig/elf/Makefile      2012-07-04 18:26:34.000000000 -0700
++++ libc/elf/Makefile   2012-08-14 20:16:10.197093639 -0700
+@@ -71,6 +71,8 @@
+ install-bin    = sprof pldd
+ others-static   = sln
+ install-rootsbin = sln
++sln-modules    := static-stubs
++extra-objs     += $(sln-modules:=.o)
+ 
+ ifeq (yes,$(use-ldconfig))
+ ifeq (yes,$(build-shared))
+@@ -78,7 +80,7 @@
+ others         += ldconfig
+ install-rootsbin += ldconfig
+ 
+-ldconfig-modules := cache readlib xmalloc xstrdup chroot_canon
++ldconfig-modules := cache readlib xmalloc xstrdup chroot_canon static-stubs
+ extra-objs     += $(ldconfig-modules:=.o)
+ endif
+ endif
+@@ -417,6 +419,8 @@
+ 
+ $(objpfx)sprof: $(libdl)
+ 
++$(objpfx)sln: $(sln-modules:%=$(objpfx)%.o)
++
+ $(objpfx)ldconfig: $(ldconfig-modules:%=$(objpfx)%.o)
+ 
+ $(objpfx)pldd: $(pldd-modules:%=$(objpfx)%.o)
+Index: libc/elf/static-stubs.c
+===================================================================
+--- /dev/null   1970-01-01 00:00:00.000000000 +0000
++++ libc/elf/static-stubs.c     2012-08-14 20:16:10.197093639 -0700
+@@ -0,0 +1,46 @@
++/* Stub implementations of functions to link into statically linked
++   programs without needing libgcc_eh.
++   Copyright (C) 2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++/* Avoid backtrace (and so _Unwind_Backtrace) dependencies from
++   sysdeps/unix/sysv/linux/libc_fatal.c.  */
++#include <sysdeps/posix/libc_fatal.c>
++
++#include <stdlib.h>
++#include <unwind.h>
++
++/* These programs do not use thread cancellation, so _Unwind_Resume
++   and the personality routine are never actually called.  */
++
++void
++_Unwind_Resume (struct _Unwind_Exception *exc __attribute__ ((unused)))
++{
++  abort ();
++}
++
++_Unwind_Reason_Code
++__gcc_personality_v0 (int version __attribute__ ((unused)),
++                     _Unwind_Action actions __attribute__ ((unused)),
++                     _Unwind_Exception_Class exception_class
++                     __attribute__ ((unused)),
++                     struct _Unwind_Exception *ue_header
++                     __attribute__ ((unused)),
++                     struct _Unwind_Context *context __attribute__ ((unused)))
++{
++  abort ();
++}
+Index: libc/ports/sysdeps/arm/Makefile
+===================================================================
+--- libc.orig/ports/sysdeps/arm/Makefile        2012-07-04 18:25:41.000000000 -0700
++++ libc/ports/sysdeps/arm/Makefile     2012-08-14 20:16:10.201093638 -0700
+@@ -1,8 +1,16 @@
++gnulib-arch = $(elfobjdir)/libgcc-stubs.a
++static-gnulib-arch = $(elfobjdir)/libgcc-stubs.a
++
+ ifeq ($(subdir),elf)
+ sysdep-dl-routines += tlsdesc dl-tlsdesc
+ sysdep_routines += aeabi_unwind_cpp_pr1 find_exidx tlsdesc dl-tlsdesc
+ sysdep-rtld-routines += aeabi_unwind_cpp_pr1 tlsdesc dl-tlsdesc
+ shared-only-routines += aeabi_unwind_cpp_pr1
++
++$(objpfx)libgcc-stubs.a: $(objpfx)aeabi_unwind_cpp_pr1.os
++       $(build-extra-lib)
++
++lib-noranlib: $(objpfx)libgcc-stubs.a
+ endif
+ 
+ ifeq ($(subdir),csu)
diff --git a/meta/recipes-core/eglibc/eglibc_2.16.bb b/meta/recipes-core/eglibc/eglibc_2.16.bb
index b053a5bf71..3b48674396 100644
--- a/meta/recipes-core/eglibc/eglibc_2.16.bb
+++ b/meta/recipes-core/eglibc/eglibc_2.16.bb
@@ -3,7 +3,7 @@ require eglibc.inc
 SRCREV = "19383"
 
 DEPENDS += "gperf-native"
-PR = "r5"
+PR = "r6"
 PR_append = "+svnr${SRCPV}"
 
 EGLIBC_BRANCH="eglibc-2_16"
@@ -25,6 +25,8 @@ SRC_URI = "svn://www.eglibc.org/svn/branches/;module=${EGLIBC_BRANCH};protocol=h
            file://e500-math_private.patch \
            file://fileops-without-wchar-io.patch \
            file://add_resource_h_to_wait_h.patch \
+           file://0001-Avoid-use-of-libgcc_s-and-libgcc_eh-when-building-gl.patch \
+           file://0001-Add-ARM-specific-static-stubs.c.patch \
           "
 LIC_FILES_CHKSUM = "file://LICENSES;md5=98a1128c4b58120182cbea3b1752d8b9 \
       file://COPYING;md5=393a5ca445f6965873eca0259a17f833 \