aports/testing/electron/compiler.patch

re: removing safe - hardened is enabled somewhere, and it can't be both.
--- ./build_overrides/build.gni.orig
+++ ./build_overrides/build.gni
@@ -24,7 +24,7 @@
 #
 # Note that setting this to true only has an effect when also building with
 # `use_custom_libcxx = true`.
-enable_safe_libcxx = true
+enable_safe_libcxx = false
 
 # Features used by //base/trace_event and //services/tracing.
 declare_args() {
--- ./build/config/compiler/compiler.gni.orig
+++ ./build/config/compiler/compiler.gni
@@ -37,6 +37,9 @@
   # The default linker everywhere else.
   use_lld = is_clang && current_os != "zos"
 
+  # enable together with use_lld
+  use_mold = false
+
   # If true, optimize for size.
   # Default to favoring speed over size for platforms not listed below.
   optimize_for_size = !is_high_end_android && (is_android || is_castos)
--- ./build/config/compiler/pgo/BUILD.gn.orig
+++ ./build/config/compiler/pgo/BUILD.gn
@@ -139,6 +139,7 @@
 
     # Enable basic block layout based on the extended TSP problem. This aims to
     # improve icache utilization and reduce the binary size.
+    if (!use_mold) {
     if (use_thin_lto) {
       if (is_win) {
         ldflags = [ "-mllvm:-enable-ext-tsp-block-placement=1" ]
@@ -150,6 +151,7 @@
         "-mllvm",
         "-enable-ext-tsp-block-placement=1",
       ]
+    }
     }
   }
 }
--- ./build/config/compiler/BUILD.gn.orig
+++ ./build/config/compiler/BUILD.gn
@@ -390,7 +390,9 @@
       }
     }
 
-    if (use_lld) {
+    if (use_mold) {
+      ldflags += [ "-fuse-ld=mold" ]
+    } else if (use_lld) {
       ldflags += [ "-fuse-ld=lld" ]
       if (lld_path != "") {
         ldflags += [ "-B$lld_path" ]
@@ -608,7 +610,7 @@
       "-mllvm",
       "-instcombine-lower-dbg-declare=0",
     ]
-    if (!is_debug && use_thin_lto && is_a_target_toolchain) {
+    if (!is_debug && use_thin_lto && is_a_target_toolchain && !use_mold) {
       if (is_win) {
         ldflags += [ "-mllvm:-instcombine-lower-dbg-declare=0" ]
       } else {
@@ -616,24 +618,6 @@
       }
     }
 
-    # TODO(crbug.com/1488374): This causes binary size growth and potentially
-    # other problems.
-    # TODO(crbug.com/1491036): This isn't supported by Cronet's mainline llvm version.
-    if (default_toolchain != "//build/toolchain/cros:target" &&
-        !llvm_android_mainline) {
-      cflags += [
-        "-mllvm",
-        "-split-threshold-for-reg-with-hint=0",
-      ]
-      if (use_thin_lto && is_a_target_toolchain) {
-        if (is_win) {
-          ldflags += [ "-mllvm:-split-threshold-for-reg-with-hint=0" ]
-        } else {
-          ldflags += [ "-Wl,-mllvm,-split-threshold-for-reg-with-hint=0" ]
-        }
-      }
-    }
-
     # TODO(crbug.com/1235145): Investigate why/if this should be needed.
     if (is_win) {
       cflags += [ "/clang:-ffp-contract=off" ]
@@ -763,6 +747,7 @@
     # TODO(gbiv): We ideally shouldn't need to specify this; ThinLTO
     # should be able to better manage binary size increases on its own.
     import_instr_limit = 30
+    not_needed([ "import_instr_limit" ])
 
     if (is_win) {
       ldflags += [
@@ -795,12 +780,14 @@
         import_instr_limit = 5
       }
 
+      if (!use_mold) {
       ldflags += [ "-Wl,-mllvm,-import-instr-limit=$import_instr_limit" ]
+      }
 
       if (is_apple) {
         ldflags += [ "-Wcrl,object_path_lto" ]
       }
-      if (!is_chromeos) {
+      if (!is_chromeos && !use_mold) {
         # TODO(https://crbug.com/972449): turn on for ChromeOS when that
         # toolchain has this flag.
         # We only use one version of LLVM within a build so there's no need to
@@ -927,7 +914,7 @@
     assert(
         is_android && host_os == "linux",
         "MLGO is currently only supported for targeting Android on a linux host")
-    if (use_thin_lto) {
+    if (use_thin_lto && !use_mold) {
       ldflags += [ "-Wl,-mllvm,-enable-ml-inliner=release" ]
     }
   }
@@ -1011,17 +998,6 @@
     # `-nodefaultlibs` from the linker invocation from Rust, which would be used
     # to compile dylibs on Android, such as for constructing unit test APKs.
     "-Cdefault-linker-libraries",
-
-    # To make Rust .d files compatible with ninja
-    "-Zdep-info-omit-d-target",
-
-    # If a macro panics during compilation, show which macro and where it is
-    # defined.
-    "-Zmacro-backtrace",
-
-    # For deterministic builds, keep the local machine's current working
-    # directory from appearing in build outputs.
-    "-Zremap-cwd-prefix=.",
   ]
 
   if (!is_win || force_rustc_color_output) {
@@ -1175,8 +1151,8 @@
     } else if (current_cpu == "arm") {
       if (is_clang && !is_android && !is_nacl &&
           !(is_chromeos_lacros && is_chromeos_device)) {
-        cflags += [ "--target=arm-linux-gnueabihf" ]
-        ldflags += [ "--target=arm-linux-gnueabihf" ]
+        cflags += [ "--target=armv7-alpine-linux-musleabihf" ]
+        ldflags += [ "--target=armv7-alpine-linux-musleabihf" ]
       }
       if (!is_nacl) {
         cflags += [
@@ -1190,8 +1166,8 @@
     } else if (current_cpu == "arm64") {
       if (is_clang && !is_android && !is_nacl && !is_fuchsia &&
           !(is_chromeos_lacros && is_chromeos_device)) {
-        cflags += [ "--target=aarch64-linux-gnu" ]
-        ldflags += [ "--target=aarch64-linux-gnu" ]
+        cflags += [ "--target=aarch64-alpine-linux-musl" ]
+        ldflags += [ "--target=aarch64-alpine-linux-musl" ]
       }
     } else if (current_cpu == "mipsel" && !is_nacl) {
       ldflags += [ "-Wl,--hash-style=sysv" ]
@@ -1478,7 +1454,9 @@
     # This can be removed once https://bugs.llvm.org/show_bug.cgi?id=40348
     # has been resolved, and -mno-outline is obeyed by the linker during
     # ThinLTO.
+    if (!use_mold) {
     ldflags += [ "-Wl,-mllvm,-enable-machine-outliner=never" ]
+    }
   }
 
   asmflags = cflags
@@ -2391,7 +2369,7 @@
     if (is_clang) {
       cflags = [ "-Oz" ] + common_optimize_on_cflags
 
-      if (use_ml_inliner && is_a_target_toolchain) {
+      if (use_ml_inliner && is_a_target_toolchain && !use_mold) {
         cflags += [
           "-mllvm",
           "-enable-ml-inliner=release",