Disable -Wl,--gdb-index with LTO.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 83d649b4c44ad5724d446fae9df91943c2e4422c..a4def5a766ee829190caf232a95036d13f06d081 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -1661,7 +1661,12 @@ config("symbols") {
     # obj/native_client/src/trusted/service_runtime/sel_asm/nacl_switch_32.o:
     # DWARF info may be corrupt; offsets in a range list entry are in different
     # sections" there.  Maybe just a bug in nacl_switch_32.S.
-    if (!is_mac && !is_ios && !is_nacl && target_cpu != "x86") {
+    # TODO(thakis): Figure out if there's a way to make this go for official
+    # builds, currently get
+    # "third_party/binutils/Linux_x64/Release/bin/ld.gold: warning:
+    # /tmp/lto-llvm-0b5201.o: corrupt debug info in .debug_info"
+    if (!is_mac && !is_ios && !is_nacl && target_cpu != "x86" &&
+        !is_official_build) {

[krasin1, 2017/03/28 17:03:38]

This is not probably what we want here. We need to add
!allow_posix_link_time_opt to fix LTO, but not official bots:
https://build.chromium.org/p/chromium.fyi/builders/CFI%20ThinLTO%20Linux%20To...
https://build.chromium.org/p/chromium.fyi/builders/ThinLTO%20Linux%20ToT/buil...

       ldflags += [ "-Wl,--gdb-index" ]
     }
   }