add --gdb-index to linker

gold linker has a flag to automatically generate gdb-index section inside shared libraries when linking. Webkit single-file compile/linking time: 16.31s without gdb-index 16.11s with gdb-index gdb startup time ~51s without gdb-index ~19s with gdb-index BUG= Review URL: https://codereview.chromium.org/1680943002 Cr-Commit-Position: refs/heads/master@{#378600}
hylschwy · Mar 1, 2016 · f68b7c0 · f68b7c0
1 parent 171ad18
commit f68b7c0
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diff --git a/build/common.gypi b/build/common.gypi
@@ -4608,6 +4608,7 @@
                   # crashing on the bots: crbug.com/161942.
                   # '-Wl,--threads',
                   # '-Wl,--thread-count=4',
+                  '-Wl,--gdb-index',
                 ],
                 'conditions': [
                   # TODO(thestig): Enable this for disabled cases.

diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
@@ -284,6 +284,7 @@ config("compiler") {
       # crashing on the bots: crbug.com/161942.
       #"-Wl,--threads",
       #"-Wl,--thread-count=4",
+      "-Wl,--gdb-index",
     ]
 
     if (!using_sanitizer && !(is_android && use_order_profiling)) {