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