libdwelf: Add dwelf_elf_gnu_build_id.

Move internal function __libdwfl_find_build_id to libdwelf and use it to
add a public dwelf_elf_gnu_build_id function to extract the NT_GNU_BUILD_ID
from an ELF file using either the shdrs or phdrs. Adjust internal callers
and add a testcase.

Signed-off-by: Mark Wielaard <[email protected]>

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/run-buildid.sh b/tests/run-buildid.sh
new file mode 100755
index 00000000..31cec24d
--- /dev/null
+++ b/tests/run-buildid.sh
@@ -0,0 +1,38 @@
+#! /bin/sh
+# Copyright (C) 2014 Red Hat, Inc.
+# This file is part of elfutils.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# elfutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. $srcdir/test-subr.sh
+
+# Just some random testfiles, four with, one without build-id,
+# and one without shdrs forcing reading the notes through phdrs.
+# eu-strip --strip-sections -g --output=testfile42_noshdrs testfile42
+# See also run-debugaltlink.sh.
+testfiles testfile42 testfile_multi.dwz testfile-dwzstr.multi \
+    test-offset-loop.alt testfile14 testfile42_noshdrs
+
+testrun_compare  ${abs_builddir}/buildid testfile42 testfile42_noshdrs \
+    testfile_multi.dwz testfile-dwzstr.multi \
+    test-offset-loop.alt testfile14 <<\EOF
+testfile42: build ID: d826d96c4d097bdc5c254b1f7344a907e36b0439
+testfile42_noshdrs: build ID: d826d96c4d097bdc5c254b1f7344a907e36b0439
+testfile_multi.dwz: build ID: a0d6c06e0d912d74033b6fe2808753cae8f6f594
+testfile-dwzstr.multi: build ID: 6da22627dae55c1d62cf9122827c665e240a056b
+test-offset-loop.alt: build ID: 066bbf1a7bc5676f5015ee1966a088f23bdb83ae
+testfile14: <no NT_GNU_BUILD_ID note>
+EOF
+
+exit 0