Make the linker script work.

Previously the build-id program (which was reading its own build-id
worked) but the so-build-id program (was was reading the linked DSO's
build id) did not.

I speculated that the __note_gnu_build_id_start symbol was not being
relocated properly since its address in the DSO was somewhat before the
.text section, while the __note_gnu_build_id_end symbol was correct. I
could even read the build-id which ended at the end symbol.

I noticed that in the output of "ld --verbose" that there is only a
".interp" section immediately before .note.gnu.build-id, while in "ld
--verbose -shared" there is nothing before .note.gnu.build-id. I think
that probably points to the problem, but I am not sure exactly what it
is.

1 files changed, 5 insertions, 7 deletions

diff --git a/build-id.lds b/build-id.lds
index ae54f64..63a23f2 100644
--- a/build-id.lds
+++ b/build-id.lds
@@ -1,11 +1,9 @@
 SECTIONS
 {
-	__note_gnu_build_id_start = .;
-}
-INSERT BEFORE .note.gnu.build-id;
-
-SECTIONS
-{
-	__note_gnu_build_id_end = .;
+	build-id : {
+		PROVIDE(__note_gnu_build_id_start = .);
+		*(.note.gnu.build-id);
+		PROVIDE(__note_gnu_build_id_end = .);
+	}
 }
 INSERT AFTER .note.gnu.build-id;