chromium-dev/gcc-enable-lto.patch

Index: chromium-75.0.3770.142/build/config/BUILDCONFIG.gn
===================================================================
--- chromium-75.0.3770.142.orig/build/config/BUILDCONFIG.gn
+++ chromium-75.0.3770.142/build/config/BUILDCONFIG.gn
@@ -130,6 +130,8 @@ declare_args() {
   # separate flags.
   is_official_build = false
 
+  gcc_lto = false
+
   # Whether we're a traditional desktop unix.
   is_desktop_linux = current_os == "linux"
 
@@ -440,6 +442,12 @@ default_compiler_configs = [
   "//build/config/sanitizers:default_sanitizer_flags",
 ]
 
+if (gcc_lto) {
+  default_compiler_configs += [
+    "//build/config/compiler:gcc_lto",
+  ]
+}
+
 if (is_win) {
   default_compiler_configs += [
     "//build/config/win:default_crt",
Index: chromium-75.0.3770.142/build/config/compiler/BUILD.gn
===================================================================
--- chromium-75.0.3770.142.orig/build/config/compiler/BUILD.gn
+++ chromium-75.0.3770.142/build/config/compiler/BUILD.gn
@@ -1921,6 +1921,10 @@ if (is_win) {
   }
 }
 
+config("gcc_lto") {
+  cflags = [ "-flto" ]
+}
+
 config("default_stack_frames") {
   if (is_posix || is_fuchsia) {
     if (enable_frame_pointers) {
Index: chromium-75.0.3770.142/sandbox/linux/BUILD.gn
===================================================================
--- chromium-75.0.3770.142.orig/sandbox/linux/BUILD.gn
+++ chromium-75.0.3770.142/sandbox/linux/BUILD.gn
@@ -256,6 +256,9 @@ component("seccomp_bpf") {
     "//base",
     "//base/third_party/dynamic_annotations",
   ]
+  config("gcc_lto") {
+    configs -= [ "//build/config/compiler:gcc_lto" ]
+  }
 
   if (is_nacl_nonsfi) {
     cflags = [ "-fgnu-inline-asm" ]