[llvm] 18a8aae - [gn build] Fix llvm_build_instrumented_coverage=true builds with goma/rbe

[Nico Weber via llvm-commits]

Author: Nico Weber
Date: 2021-07-19T19:57:02-04:00
New Revision: 18a8aaee0e3e4e9a95c52bf7627088cd7019fda8

URL: https://github.com/llvm/llvm-project/commit/18a8aaee0e3e4e9a95c52bf7627088cd7019fda8
DIFF: https://github.com/llvm/llvm-project/commit/18a8aaee0e3e4e9a95c52bf7627088cd7019fda8.diff

LOG: [gn build] Fix llvm_build_instrumented_coverage=true builds with goma/rbe

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 7998cde3712d5..9c19114ad5243 100644
--- a/llvm/utils/gn/build/BUILD.gn
+++ b/llvm/utils/gn/build/BUILD.gn
@@ -233,6 +233,14 @@ config("compiler_defaults") {
       "-fprofile-instr-generate=" +
           rebase_path("$root_build_dir/profiles/%4m.profraw"),
     ]
+    if (use_goma) {
+      # goma has a bug where it writes the server-side absolute path.
+      # Work around that.
+      # FIXME: Instead, set this to `.` for deterministic builds and pass
+      # the build dir to prepare-code-coverage-artifact.py instead.
+      cflags += [ "-fcoverage-compilation-dir=" + rebase_path(root_build_dir) ]
+    }
+
     if (host_os != "win") {
       ldflags += [ "-fprofile-instr-generate" ]
     }