Allow gdb to find debug symbols file by build-id for PE file format also

This promotes BFD's struct elf_build_id to the generic struct bfd_build_id,
populated when an ELF or PE BFD is read.

gdb is updated to use that, and to use the build-id to find symbols for PE files
also.

There is currently no generic way to extract the build-id from an object file,
perhaps an option to objdump to do this might make sense?

On x86_64-pc-cygwin, gdb's sepdebug.exp changes:

-# of unsupported tests          1
+# of expected passes            90

I don't seem to get consistent testsuite runs on i686-linux-gnu, but there
don't appear to be any regressions.

bfd/ChangeLog:

2015-06-10  Jon Turney  <jon.turney@dronecode.org.uk>

	* elf-bfd.h : Remove struct elf_build_id.
	* bfd.c : Add struct bfd_build_id.
	* bfd-in2.h: Regenerate.
	* elf.c (elfobj_grok_gnu_build_id): Update to use bfd_build_id.
	* libpei.h: Add protoype and macros for
	bfd_XXi_slurp_codeview_record.
	* peXXigen.c (_bfd_XXi_slurp_codeview_record): Make public
	* peicode.h (pe_bfd_read_buildid): Add.
	(pe_bfd_object_p): Use pe_bfd_read_buildid().

gdb/ChangeLog:

2015-06-10  Jon Turney  <jon.turney@dronecode.org.uk>

	* build-id.c: Don't include elf-bfd.h.
	(build_id_bfd_get): Use bfd_build_id.
	(build_id_verify): Ditto.
	* build-id.h: Ditto.
	(find_separate_debug_file_by_buildid): Ditto.
	* python/py-objfile.c: Don't include elf-bfd.h.
	(objfpy_get_build_id) Use bfd_build_id.
	(objfpy_build_id_matches, objfpy_lookup_objfile_by_build_id): Ditto.
	* coffread.c: Include build-id.h.
	(coff_symfile_read): Try find_separate_debug_file_by_buildid.

gdb/doc/ChangeLog:

2015-06-10  Jon Turney  <jon.turney@dronecode.org.uk>

	* gdb.texinfo (Separate Debug Files): Document that PE is also
	supported.

gdb/testsuite/ChangeLog:

2015-06-10  Jon Turney  <jon.turney@dronecode.org.uk>

	* gdb.base/sepdebug.exp: Add EXEEXT where needed.
	* lib/gdb.exp (get_build_id): Teach how to extract build-id from a
	PE file.
	* lib/future.exp (gdb_find_objdump): Add gdb_find_objdump.

Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>

1 files changed, 3 insertions, 4 deletions

diff --git a/gdb/python/py-objfile.c b/gdb/python/py-objfile.c
index c9528c3..5dc9ae6 100644
--- a/gdb/python/py-objfile.c
+++ b/gdb/python/py-objfile.c
@@ -23,7 +23,6 @@
 #include "objfiles.h"
 #include "language.h"
 #include "build-id.h"
-#include "elf-bfd.h"
 #include "symtab.h"
 
 typedef struct
@@ -134,7 +133,7 @@ objfpy_get_build_id (PyObject *self, void *closure)
 {
   objfile_object *obj = (objfile_object *) self;
   struct objfile *objfile = obj->objfile;
-  const struct elf_build_id *build_id = NULL;
+  const struct bfd_build_id *build_id = NULL;
 
   OBJFPY_REQUIRE_VALID (obj);
 
@@ -484,7 +483,7 @@ objfpy_build_id_ok (const char *string)
    It is assumed that objfpy_build_id_ok (string) returns TRUE.  */
 
 static int
-objfpy_build_id_matches (const struct elf_build_id *build_id,
+objfpy_build_id_matches (const struct bfd_build_id *build_id,
 			 const char *string)
 {
   size_t i;
@@ -542,7 +541,7 @@ objfpy_lookup_objfile_by_build_id (const char *build_id)
 
   ALL_OBJFILES (objfile)
     {
-      const struct elf_build_id *obfd_build_id;
+      const struct bfd_build_id *obfd_build_id;
 
       if (objfile->obfd == NULL)
 	continue;