+2016-07-15 Thomas Preud'homme <thomas.preudhomme@arm.com>
+
+ * 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.
+
2016-07-15 Andrew Burgess <andrew.burgess@embecosm.com>
Nick Clifton <nickc@redhat.com>
bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
struct elf_link_hash_entry *));
+ /* Filter what symbols of the output file to include in the import
+ library if one is created. */
+ unsigned int (*elf_backend_filter_implib_symbols)
+ (bfd *, struct bfd_link_info *, asymbol **, long);
+
/* Copy any information related to dynamic linking from a pre-existing
symbol to a newly created symbol. Also called to copy flags and
other back-end info to a weakdef, in which case the symbol is not
(bfd *, asection *, struct bfd_link_info *);
extern void bfd_elf_set_group_contents
(bfd *, asection *, void *);
+extern unsigned int _bfd_elf_filter_global_symbols
+ (bfd *, struct bfd_link_info *, asymbol **, long);
extern asection *_bfd_elf_check_kept_section
(asection *, struct bfd_link_info *);
#define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
|| 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. */
return TRUE;
}
+/* Generate an import library in INFO->implib_bfd from symbols in ABFD.
+ Returns TRUE upon success, FALSE otherwise. */
+
+static bfd_boolean
+elf_output_implib (bfd *abfd, struct bfd_link_info *info)
+{
+ bfd_boolean ret = FALSE;
+ bfd *implib_bfd;
+ const struct elf_backend_data *bed;
+ flagword flags;
+ enum bfd_architecture arch;
+ unsigned int mach;
+ asymbol **sympp = NULL;
+ long symsize;
+ long symcount;
+ long src_count;
+ elf_symbol_type *osymbuf;
+
+ implib_bfd = info->out_implib_bfd;
+ bed = get_elf_backend_data (abfd);
+
+ if (!bfd_set_format (implib_bfd, bfd_object))
+ return FALSE;
+
+ flags = bfd_get_file_flags (abfd);
+ flags &= ~HAS_RELOC;
+ if (!bfd_set_start_address (implib_bfd, 0)
+ || !bfd_set_file_flags (implib_bfd, flags))
+ return FALSE;
+
+ /* Copy architecture of output file to import library file. */
+ arch = bfd_get_arch (abfd);
+ mach = bfd_get_mach (abfd);
+ if (!bfd_set_arch_mach (implib_bfd, arch, mach)
+ && (abfd->target_defaulted
+ || bfd_get_arch (abfd) != bfd_get_arch (implib_bfd)))
+ return FALSE;
+
+ /* Get symbol table size. */
+ symsize = bfd_get_symtab_upper_bound (abfd);
+ if (symsize < 0)
+ return FALSE;
+
+ /* Read in the symbol table. */
+ sympp = (asymbol **) xmalloc (symsize);
+ symcount = bfd_canonicalize_symtab (abfd, sympp);
+ if (symcount < 0)
+ goto free_sym_buf;
+
+ /* Allow the BFD backend to copy any private header data it
+ understands from the output BFD to the import library BFD. */
+ if (! bfd_copy_private_header_data (abfd, implib_bfd))
+ goto free_sym_buf;
+
+ /* Filter symbols to appear in the import library. */
+ if (bed->elf_backend_filter_implib_symbols)
+ symcount = bed->elf_backend_filter_implib_symbols (abfd, info, sympp,
+ symcount);
+ else
+ symcount = _bfd_elf_filter_global_symbols (abfd, info, sympp, symcount);
+ if (symcount == 0)
+ {
+ (*_bfd_error_handler) (_("%B: no symbol found for import library"),
+ implib_bfd);
+ goto free_sym_buf;
+ }
+
+
+ /* Make symbols absolute. */
+ osymbuf = (elf_symbol_type *) bfd_alloc2 (implib_bfd, symcount,
+ sizeof (*osymbuf));
+ for (src_count = 0; src_count < symcount; src_count++)
+ {
+ memcpy (&osymbuf[src_count], (elf_symbol_type *) sympp[src_count],
+ sizeof (*osymbuf));
+ osymbuf[src_count].symbol.section = bfd_abs_section_ptr;
+ osymbuf[src_count].internal_elf_sym.st_shndx = SHN_ABS;
+ osymbuf[src_count].symbol.value += sympp[src_count]->section->vma;
+ osymbuf[src_count].internal_elf_sym.st_value =
+ osymbuf[src_count].symbol.value;
+ sympp[src_count] = &osymbuf[src_count].symbol;
+ }
+
+ bfd_set_symtab (implib_bfd, sympp, symcount);
+
+ /* Allow the BFD backend to copy any private data it understands
+ from the output BFD to the import library BFD. This is done last
+ to permit the routine to look at the filtered symbol table. */
+ if (! bfd_copy_private_bfd_data (abfd, implib_bfd))
+ goto free_sym_buf;
+
+ if (!bfd_close (implib_bfd))
+ goto free_sym_buf;
+
+ ret = TRUE;
+
+free_sym_buf:
+ free (sympp);
+ return ret;
+}
+
static void
elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
{
return FALSE;
}
+ if (info->out_implib_bfd && !elf_output_implib (abfd, info))
+ {
+ (*_bfd_error_handler) (_("%B: failed to generate import library"),
+ info->out_implib_bfd);
+ return FALSE;
+ }
+
/* Adjust the relocs to have the correct symbol indices. */
for (o = abfd->sections; o != NULL; o = o->next)
{
#ifndef elf_backend_output_arch_syms
#define elf_backend_output_arch_syms NULL
#endif
+#ifndef elf_backend_filter_implib_symbols
+#define elf_backend_filter_implib_symbols NULL
+#endif
#ifndef elf_backend_copy_indirect_symbol
-#define elf_backend_copy_indirect_symbol _bfd_elf_link_hash_copy_indirect
+#define elf_backend_copy_indirect_symbol _bfd_elf_link_hash_copy_indirect
#endif
#ifndef elf_backend_hide_symbol
-#define elf_backend_hide_symbol _bfd_elf_link_hash_hide_symbol
+#define elf_backend_hide_symbol _bfd_elf_link_hash_hide_symbol
#endif
#ifndef elf_backend_fixup_symbol
#define elf_backend_fixup_symbol NULL
elf_backend_print_symbol_all,
elf_backend_output_arch_local_syms,
elf_backend_output_arch_syms,
+ elf_backend_filter_implib_symbols,
elf_backend_copy_indirect_symbol,
elf_backend_hide_symbol,
elf_backend_fixup_symbol,
+2016-07-15 Thomas Preud'homme <thomas.preudhomme@arm.com>
+
+ * bfdlink.h (struct bfd_link_info): Declare new ldscript_def and
+ out_implib_bfd fields.
+
2016-07-14 Claudiu Zissulescu <claziss@synopsys.com>
* elf/arc-reloc.def (ARC_SDA32): Don't use ME transformation.
in a linker script. */
unsigned int linker_def : 1;
+ /* Symbol defined in a linker script. */
+ unsigned int ldscript_def : 1;
+
/* A union of information depending upon the type. */
union
{
/* The output BFD. */
bfd *output_bfd;
+ /* The import library generated. */
+ bfd *out_implib_bfd;
+
/* The list of input BFD's involved in the link. These are chained
together via the link.next field. */
bfd *input_bfds;
+2016-07-15 Thomas Preud'homme <thomas.preudhomme@arm.com>
+ Nick Clifton <nickc@redhat.com>
+
+ * 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
+
2016-07-15 Nick Clifton <nickc@redhat.com>
* testsuite/ld-arc/arc.exp: Always run the sda-relocs test in
-*- text -*-
+Changes in 2.28:
+
+* Extended the --out-implib=<file> option, previously restricted to x86 PE
+ targets, to any ELF based target. This allows the generation of an import
+ library for an ELF executable, which can then be used by another application
+ to link against the executable.
+
Changes in 2.27:
* Add a configure option --enable-relro to decide whether -z relro should
if (!is_elf_hash_table (htab))
return;
+ if (command_line.out_implib_filename)
+ {
+ unlink_if_ordinary (command_line.out_implib_filename);
+ link_info.out_implib_bfd
+ = bfd_openw (command_line.out_implib_filename,
+ bfd_get_target (link_info.output_bfd));
+
+ if (link_info.out_implib_bfd == NULL)
+ {
+ einfo ("%F%s: Can't open for writing: %E\n",
+ command_line.out_implib_filename);
+ }
+ }
+
if (emit_note_gnu_build_id != NULL)
{
bfd *abfd;
#ifdef DLL_SUPPORT
static int pe_enable_stdcall_fixup = -1; /* 0=disable 1=enable. */
static char *pe_out_def_filename = NULL;
-static char *pe_implib_filename = NULL;
static int pe_enable_auto_image_base = 0;
static unsigned long pe_auto_image_base = 0x61500000;
static char *pe_dll_search_prefix = NULL;
#define OPTION_STDCALL_ALIASES (OPTION_KILL_ATS + 1)
#define OPTION_ENABLE_STDCALL_FIXUP (OPTION_STDCALL_ALIASES + 1)
#define OPTION_DISABLE_STDCALL_FIXUP (OPTION_ENABLE_STDCALL_FIXUP + 1)
-#define OPTION_IMPLIB_FILENAME (OPTION_DISABLE_STDCALL_FIXUP + 1)
-#define OPTION_THUMB_ENTRY (OPTION_IMPLIB_FILENAME + 1)
+#define OPTION_THUMB_ENTRY (OPTION_DISABLE_STDCALL_FIXUP + 1)
#define OPTION_WARN_DUPLICATE_EXPORTS (OPTION_THUMB_ENTRY + 1)
#define OPTION_IMP_COMPAT (OPTION_WARN_DUPLICATE_EXPORTS + 1)
#define OPTION_ENABLE_AUTO_IMAGE_BASE (OPTION_IMP_COMPAT + 1)
{"add-stdcall-alias", no_argument, NULL, OPTION_STDCALL_ALIASES},
{"enable-stdcall-fixup", no_argument, NULL, OPTION_ENABLE_STDCALL_FIXUP},
{"disable-stdcall-fixup", no_argument, NULL, OPTION_DISABLE_STDCALL_FIXUP},
- {"out-implib", required_argument, NULL, OPTION_IMPLIB_FILENAME},
{"warn-duplicate-exports", no_argument, NULL, OPTION_WARN_DUPLICATE_EXPORTS},
/* getopt() allows abbreviations, so we do this to stop it from
treating -c as an abbreviation for these --compat-implib. */
fprintf (file, _(" export, place into import library instead.\n"));
fprintf (file, _(" --export-all-symbols Automatically export all globals to DLL\n"));
fprintf (file, _(" --kill-at Remove @nn from exported symbols\n"));
- fprintf (file, _(" --out-implib <file> Generate import library\n"));
fprintf (file, _(" --output-def <file> Generate a .DEF file for the built DLL\n"));
fprintf (file, _(" --warn-duplicate-exports Warn about duplicate exports\n"));
fprintf (file, _(" --compat-implib Create backward compatible import libs;\n\
case OPTION_DISABLE_STDCALL_FIXUP:
pe_enable_stdcall_fixup = 0;
break;
- case OPTION_IMPLIB_FILENAME:
- pe_implib_filename = xstrdup (optarg);
- break;
case OPTION_WARN_DUPLICATE_EXPORTS:
pe_dll_warn_dup_exports = 1;
break;
)
{
pe_dll_fill_sections (link_info.output_bfd, &link_info);
- if (pe_implib_filename)
- pe_dll_generate_implib (pe_def_file, pe_implib_filename, &link_info);
+ if (command_line.out_implib_filename)
+ pe_dll_generate_implib (pe_def_file, command_line.out_implib_filename,
+ &link_info);
}
#if defined(TARGET_IS_shpe)
/* ARM doesn't need relocs. */
#ifdef DLL_SUPPORT
static int pep_enable_stdcall_fixup = 1; /* 0=disable 1=enable (default). */
static char * pep_out_def_filename = NULL;
-static char * pep_implib_filename = NULL;
static int pep_enable_auto_image_base = 0;
static char * pep_dll_search_prefix = NULL;
#endif
OPTION_STDCALL_ALIASES,
OPTION_ENABLE_STDCALL_FIXUP,
OPTION_DISABLE_STDCALL_FIXUP,
- OPTION_IMPLIB_FILENAME,
OPTION_WARN_DUPLICATE_EXPORTS,
OPTION_IMP_COMPAT,
OPTION_ENABLE_AUTO_IMAGE_BASE,
{"add-stdcall-alias", no_argument, NULL, OPTION_STDCALL_ALIASES},
{"enable-stdcall-fixup", no_argument, NULL, OPTION_ENABLE_STDCALL_FIXUP},
{"disable-stdcall-fixup", no_argument, NULL, OPTION_DISABLE_STDCALL_FIXUP},
- {"out-implib", required_argument, NULL, OPTION_IMPLIB_FILENAME},
{"warn-duplicate-exports", no_argument, NULL, OPTION_WARN_DUPLICATE_EXPORTS},
/* getopt() allows abbreviations, so we do this to stop it from
treating -c as an abbreviation for these --compat-implib. */
fprintf (file, _(" export, place into import library instead.\n"));
fprintf (file, _(" --export-all-symbols Automatically export all globals to DLL\n"));
fprintf (file, _(" --kill-at Remove @nn from exported symbols\n"));
- fprintf (file, _(" --out-implib <file> Generate import library\n"));
fprintf (file, _(" --output-def <file> Generate a .DEF file for the built DLL\n"));
fprintf (file, _(" --warn-duplicate-exports Warn about duplicate exports.\n"));
fprintf (file, _(" --compat-implib Create backward compatible import libs;\n\
case OPTION_DISABLE_STDCALL_FIXUP:
pep_enable_stdcall_fixup = 0;
break;
- case OPTION_IMPLIB_FILENAME:
- pep_implib_filename = xstrdup (optarg);
- break;
case OPTION_WARN_DUPLICATE_EXPORTS:
pep_dll_warn_dup_exports = 1;
break;
&& pep_def_file->num_exports != 0))
{
pep_dll_fill_sections (link_info.output_bfd, &link_info);
- if (pep_implib_filename)
- pep_dll_generate_implib (pep_def_file, pep_implib_filename, &link_info);
+ if (command_line.out_implib_filename)
+ pep_dll_generate_implib (pep_def_file,
+ command_line.out_implib_filename, &link_info);
}
if (pep_out_def_filename)
input files. */
bfd_boolean accept_unknown_input_arch;
+ /* Name of the import library to generate. */
+ char *out_implib_filename;
+
/* If TRUE we'll just print the default output on stdout. */
bfd_boolean print_output_format;
this option overrides it. @xref{BFD}.
@end ifclear
+@kindex --out-implib
+@item --out-implib @var{file}
+Create an import library in @var{file} corresponding to the executable
+the linker is generating (eg. a DLL or ELF program). This import
+library (which should be called @code{*.dll.a} or @code{*.a} for DLLs)
+may be used to link clients against the generated executable; this
+behaviour makes it possible to skip a separate import library creation
+step (eg. @code{dlltool} for DLLs). This option is only available for
+the i386 PE and ELF targetted ports of the linker.
+
@kindex -pie
@kindex --pic-executable
@item -pie
[This option is specific to the i386 PE targeted port of the linker]
@cindex DLLs, creating
-@kindex --out-implib
-@item --out-implib @var{file}
-The linker will create the file @var{file} which will contain an
-import lib corresponding to the DLL the linker is generating. This
-import lib (which should be called @code{*.dll.a} or @code{*.a}
-may be used to link clients against the generated DLL; this behaviour
-makes it possible to skip a separate @code{dlltool} import library
-creation step.
-[This option is specific to the i386 PE targeted port of the linker]
-
@kindex --enable-auto-image-base
@item --enable-auto-image-base
@itemx --enable-auto-image-base=@var{value}
h->u.def.value = expld.result.value;
h->u.def.section = expld.result.section;
h->linker_def = ! tree->assign.type.lineno;
+ h->ldscript_def = 1;
if (tree->type.node_class == etree_provide)
tree->type.node_class = etree_provided;
OPTION_DYNAMIC_LINKER,
OPTION_NO_DYNAMIC_LINKER,
OPTION_SYSROOT,
+ OPTION_OUT_IMPLIB,
OPTION_EB,
OPTION_EL,
OPTION_EMBEDDED_RELOCS,
'o', N_("FILE"), N_("Set output file name"), EXACTLY_TWO_DASHES },
{ {NULL, required_argument, NULL, '\0'},
'O', NULL, N_("Optimize output file"), ONE_DASH },
+ { {"out-implib", required_argument, NULL, OPTION_OUT_IMPLIB},
+ '\0', N_("FILE"), N_("Generate import library"), TWO_DASHES },
#ifdef ENABLE_PLUGINS
{ {"plugin", required_argument, NULL, OPTION_PLUGIN},
'\0', N_("PLUGIN"), N_("Load named plugin"), ONE_DASH },
case OPTION_OFORMAT:
lang_add_output_format (optarg, NULL, NULL, 0);
break;
+ case OPTION_OUT_IMPLIB:
+ command_line.out_implib_filename = xstrdup (optarg);
+ break;
case OPTION_PRINT_SYSROOT:
if (*ld_sysroot)
puts (ld_sysroot);
run_dump_test [file rootname $t]
}
+# Check that the --out-implib option work correctly.
+run_ld_link_tests {
+ {"Generate empty import library"
+ "--out-implib=tmpdir/implib.lib" ""
+ "--defsym NO_GLOBAL=1"
+ {implib.s}
+ {{ld empty-implib.out}}
+ "implib"}
+ {"Generate import library"
+ "-Tdata=0x1000 --out-implib=tmpdir/implib.lib" ""
+ ""
+ {implib.s}
+ {{readelf {-s tmpdir/implib.lib} implib.rd}}
+ "implib"}
+}
+
if { [istarget *-*-linux*]
|| [istarget *-*-nacl*]
|| [istarget *-*-gnu*] } {
--- /dev/null
+.*: .*: no symbol found for import library
+.*: .*: failed to generate import library
--- /dev/null
+File: tmpdir/implib.lib
+
+Symbol table '.symtab' contains 3 entries:
+ Num: Value +Size Type Bind Vis Ndx Name
+ 0: [0-9a-f]+ 0 NOTYPE LOCAL DEFAULT UND
+ 1: 0+100[0-3] 1 OBJECT GLOBAL DEFAULT ABS exported1
+ 2: 0+100[0-3] 1 OBJECT GLOBAL DEFAULT ABS exported2
+
+File: tmpdir/implib
+
+#...
--- /dev/null
+.ifndef NO_GLOBAL
+ .bss
+ .comm exported1,1
+
+ .data
+ .global exported2
+ .type exported2, %object
+ .size exported2, 1
+exported2:
+ .byte 21
+.endif
+
+ .bss
+not_exported1:
+ .space 1
+ .size not_exported1, 1
+
+ .data
+ .type not_exported2, %object
+ .size not_exported2, 1
+not_exported2:
+ .byte 42
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