[llvm] f37e6fa - [gn build] Use llvm-ar when clang_base_path is specified

[Arthur Eubanks via llvm-commits]

Author: Arthur Eubanks
Date: 2022-05-11T10:40:54-07:00
New Revision: f37e6faf523d237a04b91fa3d736659a6ef8a9c6

URL: https://github.com/llvm/llvm-project/commit/f37e6faf523d237a04b91fa3d736659a6ef8a9c6
DIFF: https://github.com/llvm/llvm-project/commit/f37e6faf523d237a04b91fa3d736659a6ef8a9c6.diff

LOG: [gn build] Use llvm-ar when clang_base_path is specified

Only applies linux for now.

This prevents warnings with use_thinlto like
  bfd plugin: LLVM gold plugin has failed to create LTO module: Not an int attribute (Producer: 'LLVM15.0.0git' Reader: 'LLVM 13.0.1')

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D125399

Added: 
    

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

Removed: 
    


################################################################################
diff  --git a/llvm/utils/gn/build/toolchain/BUILD.gn b/llvm/utils/gn/build/toolchain/BUILD.gn
index 69a68b92a75fe..29da00c29fcad 100644
--- a/llvm/utils/gn/build/toolchain/BUILD.gn
+++ b/llvm/utils/gn/build/toolchain/BUILD.gn
@@ -174,7 +174,11 @@ template("unix_toolchain") {
 
 unix_toolchain("unix") {
   if (current_os != "ios" && current_os != "mac") {
-    ar = "ar"
+    if (clang_base_path != "") {
+      ar = rebase_path(clang_base_path, root_build_dir) + "/bin/llvm-ar"
+    } else {
+      ar = "ar"
+    }
   }
 
   toolchain_args = {