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gold: Properly remove the versioned symbol
When the versioned symbol foo is removed from the shared library, the ".symver foo,foo@VER" directive provides binary compatibility for foo@VER. In this case, the unversioned symbol foo should be hidden and shouldn't generate a multiple definition error. PR gold/31830 * resolve.cc (Symbol_table::resolve): Move symbol version handling to ... * symtab.cc (Symbol_table::add_from_object): Here. If the hidden version from .symver is the same as the default version from the unversioned symbol, don't make the unversioned symbol the default versioned symbol. * testsuite/Makefile.am (check_SCRIPTS): Add ver_test_pr31830.sh. (check_DATA): ver_test_pr31830_a.syms and ver_test_pr31830_b.syms. (ver_test_pr31830_a.syms): New. (ver_test_pr31830_b.syms): Likewise. (ver_test_pr31830_a.so): Likewise. (ver_test_pr31830_b.so): Likewise. * testsuite/Makefile.in: Regenerated. * testsuite/ver_test_pr31830.script: New file. * testsuite/ver_test_pr31830.sh: Likewise. * testsuite/ver_test_pr31830_a.c: Likewise. * testsuite/ver_test_pr31830_b.c: Likewise. * testsuite/ver_test_pr31830_lto.c: Likewise. * testsuite/ver_test_pr31830_lto.sh: Likewise. Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
H.J. Lu
parent
2b05f93448
commit
89d801850a
@ -250,20 +250,6 @@ Symbol_table::resolve(Sized_symbol<size>* to,
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bool to_is_ordinary;
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const unsigned int to_shndx = to->shndx(&to_is_ordinary);
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// It's possible for a symbol to be defined in an object file
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// using .symver to give it a version, and for there to also be
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// a linker script giving that symbol the same version. We
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// don't want to give a multiple-definition error for this
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// harmless redefinition.
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if (to->source() == Symbol::FROM_OBJECT
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&& to->object() == object
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&& to->is_defined()
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&& is_ordinary
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&& to_is_ordinary
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&& to_shndx == st_shndx
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&& to->value() == sym.get_st_value())
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return;
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// Likewise for an absolute symbol defined twice with the same value.
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if (!is_ordinary
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&& st_shndx == elfcpp::SHN_ABS
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@ -998,12 +998,64 @@ Symbol_table::add_from_object(Object* object,
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ret = this->get_sized_symbol<size>(ins.first->second);
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gold_assert(ret != NULL);
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bool ret_is_ordinary;
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const unsigned int ret_shndx = ret->shndx(&ret_is_ordinary);
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was_undefined_in_reg = ret->is_undefined() && ret->in_reg();
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// Commons from plugins are just placeholders.
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was_common = ret->is_common() && ret->object()->pluginobj() == NULL;
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this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object,
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version, is_default_version);
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// It's possible for a symbol to be defined in an object file
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// using .symver to give it a version, and for there to also be
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// a linker script giving that symbol the same version. We
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// don't want to give a multiple-definition error for this
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// harmless redefinition.
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bool check_version = false;
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bool erase_default_version = false;
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bool no_default_version = false;
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if (ret->source() == Symbol::FROM_OBJECT
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&& is_ordinary
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&& ret_shndx == st_shndx)
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{
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if (ret->object() == object)
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check_version = true;
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if (version != NULL && version == ret->version())
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{
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// Don't give a multiple-definition error if the hidden
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// version from .symver is the same as the default version
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// from the unversioned symbol.
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if (is_default_version && !ret->is_default ())
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{
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no_default_version = true;
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if (insdefault.second)
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{
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// Don't make the unversioned symbol the default
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// version.
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is_default_version = false;
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erase_default_version = true;
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check_version = true;
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}
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}
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else if (!is_default_version && ret->is_default ())
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{
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// Don't make the unversioned symbol the default
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// version.
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ret->set_is_not_default();
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no_default_version = true;
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check_version = true;
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}
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}
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}
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if (!(check_version
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&& ret->is_defined()
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&& ret_is_ordinary
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&& (no_default_version
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|| ret->value() == sym.get_st_value())))
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this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx,
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object, version, is_default_version);
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if (parameters->options().gc_sections())
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this->gc_mark_dyn_syms(ret);
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@ -1012,13 +1064,7 @@ Symbol_table::add_from_object(Object* object,
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insdefault.first);
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else
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{
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bool dummy;
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if (version != NULL
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&& ret->source() == Symbol::FROM_OBJECT
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&& ret->object() == object
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&& is_ordinary
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&& ret->shndx(&dummy) == st_shndx
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&& ret->is_default())
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if (version != NULL && check_version)
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{
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// We have seen NAME/VERSION already, and marked it as the
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// default version, but now we see a definition for
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@ -1032,9 +1078,17 @@ Symbol_table::add_from_object(Object* object,
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// In any other case, the two symbols should have generated
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// a multiple definition error.
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// (See PR gold/18703.)
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ret->set_is_not_default();
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// If the hidden version from .symver is the same as the
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// default version from the unversioned symbol, don't make
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// the unversioned symbol the default versioned symbol.
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const Stringpool::Key vnull_key = 0;
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this->table_.erase(std::make_pair(name_key, vnull_key));
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if (erase_default_version)
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this->table_.erase(std::make_pair(name_key, vnull_key));
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else if (ret->object() == object)
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{
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ret->set_is_not_default();
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this->table_.erase(std::make_pair(name_key, vnull_key));
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}
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}
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}
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}
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@ -1963,6 +1963,28 @@ ver_test_pr23409_1.so: gcctestdir/ld ver_test_1.o $(srcdir)/ver_test_pr23409_1.s
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ver_test_pr23409_2.so: gcctestdir/ld ver_test_1.o $(srcdir)/ver_test_pr23409_2.script
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gcctestdir/ld -shared -o $@ ver_test_1.o --version-script $(srcdir)/ver_test_pr23409_2.script
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check_SCRIPTS += ver_test_pr31830.sh
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check_DATA += ver_test_pr31830_a.syms ver_test_pr31830_b.syms
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ver_test_pr31830_a.syms: ver_test_pr31830_a.so
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$(TEST_READELF) --dyn-syms -W $< >$@
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ver_test_pr31830_b.syms: ver_test_pr31830_b.so
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$(TEST_READELF) --dyn-syms -W $< >$@
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ver_test_pr31830_a.so: gcctestdir/ld ver_test_pr31830_a.o ver_test_pr31830_b.o $(srcdir)/ver_test_pr31830.script
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gcctestdir/ld -shared -o $@ ver_test_pr31830_a.o ver_test_pr31830_b.o --version-script $(srcdir)/ver_test_pr31830.script
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ver_test_pr31830_b.so: gcctestdir/ld ver_test_pr31830_a.o ver_test_pr31830_b.o $(srcdir)/ver_test_pr31830.script
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gcctestdir/ld -shared -o $@ ver_test_pr31830_b.o ver_test_pr31830_a.o --version-script $(srcdir)/ver_test_pr31830.script
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check_SCRIPTS += ver_test_pr31830_lto.sh
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check_DATA += ver_test_pr31830_lto_a.syms ver_test_pr31830_lto_b.syms
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ver_test_pr31830_lto_a.syms: ver_test_pr31830_lto_a.so
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$(TEST_READELF) --dyn-syms -W $< >$@
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ver_test_pr31830_lto_a.so: gcctestdir/ld $(srcdir)/ver_test_pr31830_lto.c $(srcdir)/ver_test_pr31830.script
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$(LINK) -Bgcctestdir/ -shared -o $@ -O2 -fPIC -flto-partition=max $(srcdir)/ver_test_pr31830_lto.c -Wl,--version-script,$(srcdir)/ver_test_pr31830.script
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ver_test_pr31830_lto_b.syms: ver_test_pr31830_lto_b.so
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$(TEST_READELF) --dyn-syms -W $< >$@
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ver_test_pr31830_lto_b.so: gcctestdir/ld $(srcdir)/ver_test_pr31830_lto.c $(srcdir)/ver_test_pr31830.script
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$(LINK) -Bgcctestdir/ -shared -o $@ -O2 -fPIC -flto-partition=max -flto=2 $(srcdir)/ver_test_pr31830_lto.c -Wl,--version-script,$(srcdir)/ver_test_pr31830.script
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check_SCRIPTS += weak_as_needed.sh
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check_DATA += weak_as_needed.stdout
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weak_as_needed.stdout: weak_as_needed_a.so
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@ -469,6 +469,8 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_10.sh ver_test_13.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_14.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr23409.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr31830.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr31830_lto.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ weak_as_needed.sh relro_test.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_matching_test.sh \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_3.sh \
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@ -526,6 +528,10 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_13.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_14.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr23409.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr31830_a.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr31830_b.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr31830_lto_a.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_pr31830_lto_b.syms \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ weak_as_needed.stdout \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ protected_3.err \
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ relro_test.stdout \
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@ -5900,6 +5906,20 @@ ver_test_pr23409.sh.log: ver_test_pr23409.sh
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--log-file $$b.log --trs-file $$b.trs \
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$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
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"$$tst" $(AM_TESTS_FD_REDIRECT)
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ver_test_pr31830.sh.log: ver_test_pr31830.sh
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@p='ver_test_pr31830.sh'; \
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b='ver_test_pr31830.sh'; \
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$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
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--log-file $$b.log --trs-file $$b.trs \
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$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
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"$$tst" $(AM_TESTS_FD_REDIRECT)
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ver_test_pr31830_lto.sh.log: ver_test_pr31830_lto.sh
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@p='ver_test_pr31830_lto.sh'; \
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b='ver_test_pr31830_lto.sh'; \
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$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
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--log-file $$b.log --trs-file $$b.trs \
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$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
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"$$tst" $(AM_TESTS_FD_REDIRECT)
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weak_as_needed.sh.log: weak_as_needed.sh
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@p='weak_as_needed.sh'; \
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b='weak_as_needed.sh'; \
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@ -8900,6 +8920,22 @@ uninstall-am:
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ gcctestdir/ld -shared -o $@ ver_test_1.o ver_test_pr23409_2.so --version-script $(srcdir)/ver_test_pr23409_1.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr23409_2.so: gcctestdir/ld ver_test_1.o $(srcdir)/ver_test_pr23409_2.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ gcctestdir/ld -shared -o $@ ver_test_1.o --version-script $(srcdir)/ver_test_pr23409_2.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_a.syms: ver_test_pr31830_a.so
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) --dyn-syms -W $< >$@
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_b.syms: ver_test_pr31830_b.so
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) --dyn-syms -W $< >$@
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_a.so: gcctestdir/ld ver_test_pr31830_a.o ver_test_pr31830_b.o $(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ gcctestdir/ld -shared -o $@ ver_test_pr31830_a.o ver_test_pr31830_b.o --version-script $(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_b.so: gcctestdir/ld ver_test_pr31830_a.o ver_test_pr31830_b.o $(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ gcctestdir/ld -shared -o $@ ver_test_pr31830_b.o ver_test_pr31830_a.o --version-script $(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_lto_a.syms: ver_test_pr31830_lto_a.so
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) --dyn-syms -W $< >$@
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_lto_a.so: gcctestdir/ld $(srcdir)/ver_test_pr31830_lto.c $(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(LINK) -Bgcctestdir/ -shared -o $@ -O2 -fPIC -flto-partition=max $(srcdir)/ver_test_pr31830_lto.c -Wl,--version-script,$(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_lto_b.syms: ver_test_pr31830_lto_b.so
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) --dyn-syms -W $< >$@
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ver_test_pr31830_lto_b.so: gcctestdir/ld $(srcdir)/ver_test_pr31830_lto.c $(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(LINK) -Bgcctestdir/ -shared -o $@ -O2 -fPIC -flto-partition=max -flto=2 $(srcdir)/ver_test_pr31830_lto.c -Wl,--version-script,$(srcdir)/ver_test_pr31830.script
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@GCC_TRUE@@NATIVE_LINKER_TRUE@weak_as_needed.stdout: weak_as_needed_a.so
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@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) -dW --dyn-syms $< >$@
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@GCC_TRUE@@NATIVE_LINKER_TRUE@weak_as_needed_a.so: gcctestdir/ld weak_as_needed_a.o weak_as_needed_b.so weak_as_needed_c.so
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6
gold/testsuite/ver_test_pr31830.script
Normal file
6
gold/testsuite/ver_test_pr31830.script
Normal file
@ -0,0 +1,6 @@
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GLIBC_2.2.5 {
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global:
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foo;
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local:
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*;
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};
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61
gold/testsuite/ver_test_pr31830.sh
Executable file
61
gold/testsuite/ver_test_pr31830.sh
Executable file
@ -0,0 +1,61 @@
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#!/bin/sh
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# ver_test_pr31830.sh -- a test case for version scripts
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# Copyright (C) 2024 Free Software Foundation, Inc.
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# This file is part of gold.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program 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
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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# This test verifies that linker-generated symbols (e.g., _end)
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# get correct version information even in the presence of
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# a shared library that provides those symbols with different
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# versions.
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check()
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{
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if ! grep -q "$2" "$1"
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then
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echo "Did not find expected symbol in $1:"
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echo " $2"
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echo ""
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echo "Actual output below:"
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cat "$1"
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exit 1
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fi
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}
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check_missing()
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{
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if grep -q "$2" "$1"
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then
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echo "Found unexpected symbol in $1:"
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echo " $2"
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echo ""
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echo "Actual output below:"
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cat "$1"
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exit 1
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fi
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}
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check ver_test_pr31830_a.syms "foo@GLIBC_2.2.5$"
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check ver_test_pr31830_b.syms "foo@GLIBC_2.2.5$"
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check_missing ver_test_pr31830_a.syms "foo@@GLIBC_2.2.5$"
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check_missing ver_test_pr31830_b.syms "foo@@GLIBC_2.2.5$"
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exit 0
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2
gold/testsuite/ver_test_pr31830_a.c
Normal file
2
gold/testsuite/ver_test_pr31830_a.c
Normal file
@ -0,0 +1,2 @@
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extern void foo(void);
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void foo(void) {}
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3
gold/testsuite/ver_test_pr31830_b.c
Normal file
3
gold/testsuite/ver_test_pr31830_b.c
Normal file
@ -0,0 +1,3 @@
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extern void __collector_foo_2_2(void);
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__attribute__((__symver__("foo@GLIBC_2.2.5")))
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void __collector_foo_2_2(void) {}
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5
gold/testsuite/ver_test_pr31830_lto.c
Normal file
5
gold/testsuite/ver_test_pr31830_lto.c
Normal file
@ -0,0 +1,5 @@
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extern __inline __attribute__((__gnu_inline__)) void foo(void) {}
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extern void __collector_foo_2_2(void);
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__attribute__((__symver__("foo@GLIBC_2.2.5")))
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void __collector_foo_2_2(void) {}
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void foo(void) {}
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||||
61
gold/testsuite/ver_test_pr31830_lto.sh
Executable file
61
gold/testsuite/ver_test_pr31830_lto.sh
Executable file
@ -0,0 +1,61 @@
|
||||
#!/bin/sh
|
||||
|
||||
# ver_test_pr31830_lto.sh -- a test case for version scripts with LTO
|
||||
|
||||
# Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
|
||||
# This file is part of gold.
|
||||
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
|
||||
# This program 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 General Public License for more details.
|
||||
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, write to the Free Software
|
||||
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
||||
# MA 02110-1301, USA.
|
||||
|
||||
# This test verifies that linker-generated symbols (e.g., _end)
|
||||
# get correct version information even in the presence of
|
||||
# a shared library that provides those symbols with different
|
||||
# versions.
|
||||
|
||||
check()
|
||||
{
|
||||
if ! grep -q "$2" "$1"
|
||||
then
|
||||
echo "Did not find expected symbol in $1:"
|
||||
echo " $2"
|
||||
echo ""
|
||||
echo "Actual output below:"
|
||||
cat "$1"
|
||||
exit 1
|
||||
fi
|
||||
}
|
||||
|
||||
check_missing()
|
||||
{
|
||||
if grep -q "$2" "$1"
|
||||
then
|
||||
echo "Found unexpected symbol in $1:"
|
||||
echo " $2"
|
||||
echo ""
|
||||
echo "Actual output below:"
|
||||
cat "$1"
|
||||
exit 1
|
||||
fi
|
||||
}
|
||||
|
||||
check ver_test_pr31830_lto_a.syms "foo@GLIBC_2.2.5$"
|
||||
check ver_test_pr31830_lto_b.syms "foo@GLIBC_2.2.5$"
|
||||
|
||||
check_missing ver_test_pr31830_lto_a.syms "foo@@GLIBC_2.2.5$"
|
||||
check_missing ver_test_pr31830_lto_b.syms "foo@@GLIBC_2.2.5$"
|
||||
|
||||
exit 0
|
||||
Loading…
Reference in New Issue
Block a user