[llvm] d75be4c - [gn] Use ghash if using clang & LLD together to make PDBs

[Reid Kleckner via llvm-commits]

Author: Reid Kleckner
Date: 2020-03-09T15:23:54-07:00
New Revision: d75be4c06a73c316f2a1711ecd94a80f46776121

URL: https://github.com/llvm/llvm-project/commit/d75be4c06a73c316f2a1711ecd94a80f46776121
DIFF: https://github.com/llvm/llvm-project/commit/d75be4c06a73c316f2a1711ecd94a80f46776121.diff

LOG: [gn] Use ghash if using clang & LLD together to make PDBs

I noticed my links were a bit slower on Windows than usual.

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D75774

Added: 
    

Modified: 
    llvm/utils/gn/build/BUILD.gn

Removed: 
    


################################################################################
diff  --git a/llvm/utils/gn/build/BUILD.gn b/llvm/utils/gn/build/BUILD.gn
index 31d3ac5e5fc6..a1a4b065d6ff 100644
--- a/llvm/utils/gn/build/BUILD.gn
+++ b/llvm/utils/gn/build/BUILD.gn
@@ -64,6 +64,12 @@ config("compiler_defaults") {
         "/FS",
       ]
       ldflags += [ "/DEBUG" ]
+
+      # Speed up links with ghash on windows.
+      if (use_lld && is_clang) {
+        cflags += [ "-gcodeview-ghash" ]
+        ldflags += [ "/DEBUG:GHASH" ]
+      }
     }
     if (is_optimized) {
       cflags += [