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This patch adds a new command-line option --export-dynamic-symbol=sym. It's similar to --dynamic-list=list, but takes a single, mangled, symbol name from the command line rather than using a version script file. Like -u, it can be used repeatedly, and the symbols named by this option will be treated as referenced, will cause an archive member to be loaded, and will not be garbage collected. Symbols named via --dynamic-list, on the other hand, do not prevent garbage collection and do not cause archive members to be loaded. I considered changing that, but decided not to at this time. If we do decide to change that option, I'd want to do that as a separate patch. Symbols in that file work more like a version script -- they're treated as demangled names, may have approximate matching, there's no error if such a symbol is never defined, and we check that list only after garbage collection has taken place -- so it didn't quite seem appropriate to make that option work the same way. The --dynamic-list option is more like the --dynamic-list-xxx options: more passive, applying only to symbols that have already survived archive selection and garbage collection. I've added a warning if there's an attempt to export a forced-local symbol (e.g., a symbol with "hidden" visibility). OK to commit? -cary * archive.cc (Library_base::should_include_member): Check for --export-dynamic-symbol. * options.h (class General_options): Add --export-dynamic-symbol. * symtab.cc (Symbol::should_add_dynsym_entry): Check for --export-dynamic-symbol. (Symbol_table::gc_mark_undef_symbols): Likewise. (Symbol_table::do_add_undefined_symbols_from_command_line): Likewise.
Attachment:
gold-export-dynamic-symbol.txt
Description: Text document
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