From: Philippe Proulx <eeppeliteloop@gmail.com>
Date: Sat, 29 Oct 2016 17:32:57 +0000 (-0400)
Subject: Fix: lttng-ust-elf.c: define NT_GNU_BUILD_ID if not defined
X-Git-Tag: v2.9.1~1
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=e9dbbd6ee8a813cb5999c67ca21a6a10e4222d79;p=lttng-ust.git

Fix: lttng-ust-elf.c: define NT_GNU_BUILD_ID if not defined

On uClibc, NT_GNU_BUILD_ID is not defined, so we define it
manually in this case.

This definition is the number given to the .note.gnu.build-id section
(of type SHT_NOTE) of a linked ELF object.

    The ELF note headers give name "GNU" and type 3 (NT_GNU_BUILD_ID)
for a build ID note, of which there can be only one in a linked object
[...]

See http://fedoraproject.org/wiki/RolandMcGrath/BuildID

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/liblttng-ust/lttng-ust-elf.c b/liblttng-ust/lttng-ust-elf.c
index 663699b7..a496841a 100644
--- a/liblttng-ust/lttng-ust-elf.c
+++ b/liblttng-ust/lttng-ust-elf.c
@@ -31,6 +31,10 @@
 
 #define BUF_LEN	4096
 
+#ifndef NT_GNU_BUILD_ID
+# define NT_GNU_BUILD_ID	3
+#endif
+
 /*
  * Retrieve the nth (where n is the `index` argument) phdr (program
  * header) from the given elf instance.