--- build/config/compiler/pgo/BUILD.gn.orig	2023-11-29 21:39:40 UTC
+++ build/config/compiler/pgo/BUILD.gn
@@ -139,13 +139,14 @@ config("pgo_optimization_flags") {
 
     # Enable basic block layout based on the extended TSP problem. This aims to
     # improve icache utilization and reduce the binary size.
-    if (use_thin_lto) {
+    # __clang_major__ >= 15
+    if (use_thin_lto && !is_bsd) {
       if (is_win) {
         ldflags = [ "-mllvm:-enable-ext-tsp-block-placement=1" ]
       } else {
         ldflags = [ "-Wl,-mllvm,-enable-ext-tsp-block-placement=1" ]
       }
-    } else {
+    } else if (!is_bsd) {
       cflags += [
         "-mllvm",
         "-enable-ext-tsp-block-placement=1",