From 76359541825cf36ecd14ab6b5974ee56e1c59eff Mon Sep 17 00:00:00 2001 From: Thomas Preud'homme Date: Fri, 15 Jul 2016 17:49:08 +0100 Subject: Add support for creating ELF import libraries 2016-07-15 Thomas Preud'homme bfd/ * elf-bfd.h (elf_backend_filter_implib_symbols): Declare backend hook. (_bfd_elf_filter_global_symbols): Declare. * elf.c (_bfd_elf_filter_global_symbols): New function. * elflink.c (elf_filter_global_symbols): Likewise. (elf_output_implib): Likewise. (bfd_elf_final_link): Call above function, failing if it does. * elfxx-target.h (elf_backend_filter_implib_symbols): Define macro and default it to NULL. (elf_backend_copy_indirect_symbol): Fix spacing. (elf_backend_hide_symbol): Likewise. (elfNN_bed): Initialize elf_backend_filter_implib_symbols backend hook. include/ * bfdlink.h (struct bfd_link_info): Declare new ldscript_def and out_implib_bfd fields. 2016-07-15 Thomas Preud'homme Nick Clifton ld/ * emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Open import library file for writing and initialize implib_bfd field of link_info structure. * emultempl/pe.em (pe_implib_filename): Remove variable declaration. (OPTION_IMPLIB_FILENAME): Remove macro definition. (gld${EMULATION_NAME}_add_options): Remove --out-implib option. (gld_${EMULATION_NAME}_list_options): Likewise. (gld${EMULATION_NAME}_handle_option): Likewise. (gld_${EMULATION_NAME}_finish): Use command_line.out_implib_filename instead of pe_implib_filename. * emultempl/pep.em (pep_implib_filename): Remove variable declaration. (OPTION_IMPLIB_FILENAME): Remove enumerator. (gld${EMULATION_NAME}_add_options): Remove --out-implib option. (gld_${EMULATION_NAME}_list_options): Likewise. (gld${EMULATION_NAME}_handle_option): Likewise. (gld_${EMULATION_NAME}_finish): Use command_line.out_implib_filename instead of pep_implib_filename. * ld.h (args_type): Declare new out_implib_filename field. * ld.texinfo (--out-implib): Move documentation to arch-independent part and rephrase to apply to ELF targets. * ldexp.c (exp_fold_tree_1): Set ldscript_def field to 1 for symbols defined in linker scripts. * ldlex.h (enum option_values): Declare new OPTION_OUT_IMPLIB enumerator. * lexsup.c (ld_options): Add entry for new --out-implib switch. (parse_args): Handle OPTION_OUT_IMPLIB case. * testsuite/ld-elf/elf.exp (Generate empty import library): New test. (Generate import library): Likewise. * testsuite/ld-elf/implib.s: Likewise. * testsuite/ld-elf/implib.rd: New file. * testsuite/ld-elf/empty-implib.out: Likewise --- bfd/elf.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'bfd/elf.c') diff --git a/bfd/elf.c b/bfd/elf.c index cb4de50..ebcf40a 100644 --- a/bfd/elf.c +++ b/bfd/elf.c @@ -3870,6 +3870,43 @@ sym_is_global (bfd *abfd, asymbol *sym) || bfd_is_com_section (bfd_get_section (sym))); } +/* Filter global symbols of ABFD to include in the import library. All + SYMCOUNT symbols of ABFD can be examined from their pointers in + SYMS. Pointers of symbols to keep should be stored contiguously at + the beginning of that array. + + Returns the number of symbols to keep. */ + +unsigned int +_bfd_elf_filter_global_symbols (bfd *abfd, struct bfd_link_info *info, + asymbol **syms, long symcount) +{ + long src_count, dst_count = 0; + + for (src_count = 0; src_count < symcount; src_count++) + { + asymbol *sym = syms[src_count]; + char *name = (char *) bfd_asymbol_name (sym); + struct bfd_link_hash_entry *h; + + if (!sym_is_global (abfd, sym)) + continue; + + h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, FALSE); + if (h->type != bfd_link_hash_defined && h->type != bfd_link_hash_defweak) + continue; + + if (h->linker_def || h->ldscript_def) + continue; + + syms[dst_count++] = sym; + } + + syms[dst_count] = NULL; + + return dst_count; +} + /* Don't output section symbols for sections that are not going to be output, that are duplicates or there is no BFD section. */ -- cgit v1.1