--- build/config/compiler/BUILD.gn.orig	2024-02-23 21:04:38 UTC
+++ build/config/compiler/BUILD.gn
@@ -204,7 +204,7 @@ declare_args() {
   # This greatly reduces the size of debug builds, at the cost of
   # debugging information which is required by some specialized
   # debugging tools.
-  simple_template_names = is_clang && !is_nacl && !is_win && !is_apple
+  simple_template_names = is_clang && !is_nacl && !is_win && !is_apple && !is_bsd
 }
 
 declare_args() {
@@ -268,13 +268,16 @@ config("default_include_dirs") {
 # Compiler instrumentation can introduce dependencies in DSOs to symbols in
 # the executable they are loaded into, so they are unresolved at link-time.
 config("no_unresolved_symbols") {
-  if (!using_sanitizer &&
+  if (!using_sanitizer && !is_bsd &&
       (is_linux || is_chromeos || is_android || is_fuchsia)) {
     ldflags = [
       "-Wl,-z,defs",
       "-Wl,--as-needed",
     ]
   }
+  if (current_cpu == "x86" && is_openbsd) {
+    ldflags = [ "-Wl,-z,notext" ]
+  }
 }
 
 # compiler ---------------------------------------------------------------------
@@ -520,6 +523,10 @@ config("compiler") {
     }
   }
 
+  if (is_openbsd) {
+    ldflags += [ "-Wl,-z,wxneeded" ]
+  }
+
   # Linux-specific compiler flags setup.
   # ------------------------------------
   if (use_gold) {
@@ -595,7 +602,7 @@ config("compiler") {
     ldflags += [ "-Wl,-z,keep-text-section-prefix" ]
   }
 
-  if (is_clang && !is_nacl && current_os != "zos") {
+  if (is_clang && !is_nacl && current_os != "zos" && !is_bsd) {
     cflags += [ "-fcrash-diagnostics-dir=" + clang_diagnostic_dir ]
     if (save_reproducers_on_lld_crash && use_lld) {
       ldflags += [
@@ -1174,7 +1181,7 @@ config("compiler_cpu_abi") {
         ]
       }
     } else if (current_cpu == "arm") {
-      if (is_clang && !is_android && !is_nacl &&
+      if (is_clang && !is_android && !is_nacl && !is_bsd &&
           !(is_chromeos_lacros && is_chromeos_device)) {
         cflags += [ "--target=arm-linux-gnueabihf" ]
         ldflags += [ "--target=arm-linux-gnueabihf" ]
@@ -1189,7 +1196,7 @@ config("compiler_cpu_abi") {
         cflags += [ "-mtune=$arm_tune" ]
       }
     } else if (current_cpu == "arm64") {
-      if (is_clang && !is_android && !is_nacl && !is_fuchsia &&
+      if (is_clang && !is_android && !is_nacl && !is_fuchsia && !is_bsd &&
           !(is_chromeos_lacros && is_chromeos_device)) {
         cflags += [ "--target=aarch64-linux-gnu" ]
         ldflags += [ "--target=aarch64-linux-gnu" ]
@@ -1524,7 +1531,7 @@ config("compiler_deterministic") {
     # different build directory like "out/feature_a" and "out/feature_b" if
     # we build same files with same compile flag.
     # Other paths are already given in relative, no need to normalize them.
-    if (is_nacl) {
+    if (is_nacl || is_bsd) {
       # TODO(https://crbug.com/1231236): Use -ffile-compilation-dir= here.
       cflags += [
         "-Xclang",
@@ -1576,7 +1583,7 @@ config("compiler_deterministic") {
 }
 
 config("clang_revision") {
-  if (is_clang && clang_base_path == default_clang_base_path) {
+  if (is_clang && !is_bsd && clang_base_path == default_clang_base_path) {
     update_args = [
       "--print-revision",
       "--verify-version=$clang_version",
@@ -1874,12 +1881,9 @@ config("default_warnings") {
 
         # TODO(crbug.com/1494809): Evaluate and possibly enable.
         "-Wno-vla-extension",
-
-        # TODO(https://crbug.com/1490607): Fix and re-enable.
-        "-Wno-thread-safety-reference-return",
       ]
 
-      if (!is_nacl) {
+      if (!is_nacl && !is_bsd) {
         cflags_cc += [
           # TODO(https://crbug.com/1513724): Fix and re-enable.
           "-Wno-c++11-narrowing-const-reference",
@@ -2067,7 +2071,7 @@ config("no_chromium_code") {
       # third-party libraries.
       "-Wno-c++11-narrowing",
     ]
-    if (!is_nacl) {
+    if (!is_nacl && !is_freebsd) {
       cflags += [
         # Disabled for similar reasons as -Wunused-variable.
         "-Wno-unused-but-set-variable",
@@ -2596,7 +2600,7 @@ config("afdo_optimize_size") {
 # There are some targeted places that AFDO regresses, so we provide a separate
 # config to allow AFDO to be disabled per-target.
 config("afdo") {
-  if (is_clang) {
+  if (is_clang && !is_bsd) {
     cflags = []
     if (clang_emit_debug_info_for_profiling) {
       # Add the following flags to generate debug info for profiling.
@@ -2623,7 +2627,7 @@ config("afdo") {
       cflags += [ "-Wno-backend-plugin" ]
       inputs = [ _clang_sample_profile ]
     }
-  } else if (auto_profile_path != "" && is_a_target_toolchain) {
+  } else if (auto_profile_path != "" && is_a_target_toolchain && !is_bsd) {
     cflags = [ "-fauto-profile=${auto_profile_path}" ]
     inputs = [ auto_profile_path ]
   }
@@ -2787,7 +2791,8 @@ config("symbols") {
     configs += [ "//build/config:compress_debug_sections" ]
   }
 
-  if (is_clang && (!is_nacl || is_nacl_saigo) && current_os != "zos") {
+  if (is_clang && (!is_nacl || is_nacl_saigo) && current_os != "zos" &&
+      !is_bsd) {
     if (is_apple) {
       # TODO(https://crbug.com/1050118): Investigate missing debug info on mac.
       # Make sure we don't use constructor homing on mac.