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Avoid use of libgcc_s and libgcc_eh when building glibc.
This commit is contained in:
Joseph Myers
parent
7a845b2c23
commit
95f5a9a866
47
ChangeLog
47
ChangeLog
@ -1,5 +1,52 @@
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2012-07-03 Joseph Myers <joseph@codesourcery.com>
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* Makeconfig [!+link] (+link-before-libc): New variable.
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[!+link] (+link-after-libc): Likewise.
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[!+link] (+link-tests): Likewise.
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[!+link] (+link): Define in terms of $(+link-before-libc) and
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$(+link-after-libc).
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[!+link-static] (+link-static-before-libc): New variable.
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[!+link-static] (+link-static-after-libc): Likewise.
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[!+link-static] (+link-static-tests): Likewise.
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[!+link-static] (+link-static): Define in terms of
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$(+link-static-before-libc) and $(+link-static-after-libc).
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[build-shared] (link-libc-before-gnulib): New variable.
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[build-shared] (link-libc-tests): Likewise.
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[build-shared] (link-libc): Define in terms of
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$(link-libc-before-gnulib).
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[!build-shared] (link-libc-tests): New variable.
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(link-libc-static-tests): New variable.
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[!gnulib] (gnulib-arch): New variable.
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[!gnulib] (gnulib-tests): Likewise.
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[!gnulib] (static-gnulib-arch): Likewise.
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[!gnulib] (static-gnulib-tests): Likewise.
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[!gnulib] (gnulib): Use $(gnulib-arch). Do not use $(libgcc_eh).
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Define with "=" instead of ":=".
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[!gnulib] (static-gnulib): Use $(static-gnulib-arch). Do not use
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-lgcc_eh $(libunwind). Define with "=" instead of ":=".
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* Rules (binaries-all-notests): New variable.
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(binaries-all-tests): Likewise.
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(binaries-static-notests): Likewise.
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(binaries-static-tests): Likewise.
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(binaries-all): Define using $(binaries-all-notests) and
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$(binaries-all-tests).
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(binaries-static): Define using $(binaries-static-notests) and
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$(binaries-static-tests).
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(binaries-shared-tests): New variable.
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(binaries-shared-notests): Likewise.
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(binaries-shared): Remove variable.
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($(addprefix $(objpfx),$(binaries-shared-notests))): New rule.
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($(addprefix $(objpfx),$(binaries-shared-tests))): Likewise.
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($(addprefix $(objpfx),$(binaries-shared))): Remove rule.
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($(addprefix $(objpfx),$(binaries-static-notests))): New rule.
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($(addprefix $(objpfx),$(binaries-static-tests))): Likewise.
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($(addprefix $(objpfx),$(binaries-static))): Remove rule.
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* elf/Makefile (sln-modules): New variable.
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(extra-objs): Add $(sln-modules:=.o).
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(ldconfig-modules): Add static-stubs.
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($(objpfx)sln): Depend on $(sln-modules:%=$(objpfx)%.o).
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* elf/static-stubs.c: New file.
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[BZ #14283]
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* sysdeps/ieee754/flt-32/k_rem_pio2f.c (__kernel_rem_pio2f): Shift
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by 7 not 8 to examine high bit of fractional part. Use volatile
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68
Makeconfig
68
Makeconfig
@ -415,9 +415,9 @@ LDFLAGS.so += $(hashstyle-LDFLAGS)
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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 @@ ifndef +link
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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 @@ ifndef +link-pie
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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) $(+prector) \
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@ -451,7 +454,12 @@ ifndef +link-static
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$(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 @@ ifeq (yes,$(build-shared))
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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 @@ else
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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 @@ endif
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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 @@ else
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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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45
Rules
45
Rules
@ -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 @@ xtests: tests $(xtests:%=$(objpfx)%.out) $(xtests-bp.out)
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endif
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ifeq ($(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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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 @@ $(addprefix $(objpfx),$(binaries-pie)): %: %.o \
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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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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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@ -71,6 +71,8 @@ others = sprof sln pldd
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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 @@ others-static += ldconfig
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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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@ -411,6 +413,8 @@ $(objpfx)ldd: ldd.bash.in $(common-objpfx)soversions.mk \
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$(objpfx)sprof: $(libdl)
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$(objpfx)sln: $(sln-modules:%=$(objpfx)%.o)
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$(objpfx)ldconfig: $(ldconfig-modules:%=$(objpfx)%.o)
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$(objpfx)pldd: $(pldd-modules:%=$(objpfx)%.o)
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46
elf/static-stubs.c
Normal file
46
elf/static-stubs.c
Normal file
@ -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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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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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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/* 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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#include <stdlib.h>
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#include <unwind.h>
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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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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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_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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@ -1,3 +1,10 @@
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2012-07-03 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/arm/Makefile (gnulib-arch): New variable.
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(static-gnulib-arch): Likewise.
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[subdir = elf] ($(objpfx)libgcc-stubs.a): New rule.
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[subdir = elf] (lib-noranlib): Depend on $(objpfx)libgcc-stubs.a.
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2012-06-12 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/unix/sysv/linux/arm/setcontext.S (__startcontext): Use
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@ -1,8 +1,16 @@
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gnulib-arch = $(elfobjdir)/libgcc-stubs.a
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static-gnulib-arch = $(elfobjdir)/libgcc-stubs.a
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ifeq ($(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
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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: $(objpfx)libgcc-stubs.a
|
||||
endif
|
||||
|
||||
ifeq ($(subdir),csu)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user