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For ELF linker, a common symbol isn't a definition. When we decide if a
symbol should be re-exported, we should check if the symbol isn't
undefined, not if it is a definition.
bfd/
PR ld/18914
* elflink.c (elf_link_add_object_symbols): Don't re-export a
symbol if it isn't undefined.
ld/testsuite/
PR ld/18914
* ld-elf/exclude.exp: Also check exclude_common.
* ld-elf/exclude2.s: Add exclude_common.
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* ld-elf/exclude.exp: Allow cris-*-elf.
* ld-elf/exclude1.s: Add ".data". Remove "- include_sym".
* ld-elf/exclude2.s: Add ".data".
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* bfd-in2.h: Regenerate.
* bfd.c (struct bfd): Add no_export.
* elflink.c (elf_link_add_object_symbols): Handle no_export.
ld/
* ldlang.c (struct excluded_lib, excluded_libs, add_excluded_libs)
(check_excluded_libs): New.
(load_symbols): Call check_excluded_libs.
* ldlang.h (add_excluded_libs): New prototype.
* emultempl/elf32.em (OPTION_EXCLUDED_LIBS): Define.
(gld${EMULATION_NAME}_add_options): Add --exclude-libs.
(gld${EMULATION_NAME}_handle_option): Handle --exclude-libs.
* ld.texinfo (Command Line Variables): Document --exclude-libs.
(Options Specific to i386 PE Targets): Remove --exclude-libs.
ld/testsuite/
* ld-elf/exclude1.s, ld-elf/exclude2.s, ld-elf/exclude.exp: New.
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