chromium: rebase patches for M126

Note that we can't just update previous patches in place, as that would
prevent electron-source and ungoogled-chrome (< M126) from building.

3 files changed, 62 insertions, 3 deletions

diff --git a/pkgs/applications/networking/browsers/chromium/common.nix b/pkgs/applications/networking/browsers/chromium/common.nix
index e7597249acdb5..a5560acd8ad82 100644
--- a/pkgs/applications/networking/browsers/chromium/common.nix
+++ b/pkgs/applications/networking/browsers/chromium/common.nix
@@ -269,9 +269,15 @@ let
       # Chromium reads initial_preferences from its own executable directory
       # This patch modifies it to read /etc/chromium/initial_preferences
       ./patches/chromium-initial-prefs.patch
-    ] ++ lib.optionals (chromiumVersionAtLeast "120") [
-      # We need to revert this patch to build M120+ with LLVM 17:
+    ] ++ lib.optionals (versionRange "120" "126") [
+      # Partial revert to build M120+ with LLVM 17:
+      # https://github.com/chromium/chromium/commit/02b6456643700771597c00741937e22068b0f956
+      # https://github.com/chromium/chromium/commit/69736ffe943ff996d4a88d15eb30103a8c854e29
       ./patches/chromium-120-llvm-17.patch
+    ] ++ lib.optionals (chromiumVersionAtLeast "126") [
+      # Rebased variant of patch right above to build M126+ with LLVM 17.
+      # staging-next will bump LLVM to 18, so we will be able to drop this soon.
+      ./patches/chromium-126-llvm-17.patch
     ] ++ lib.optionals (!chromiumVersionAtLeast "119.0.6024.0") [
       # Fix build with at-spi2-core ≥ 2.49
       # This version is still needed for electron.
@@ -286,11 +292,14 @@ let
         commit = "b9bef8e9555645fc91fab705bec697214a39dbc1";
         hash = "sha256-CJ1v/qc8+nwaHQR9xsx08EEcuVRbyBfCZCm/G7hRY+4=";
       })
-    ] ++ lib.optionals (chromiumVersionAtLeast "121") [
+    ] ++ lib.optionals (versionRange "121" "126") [
       # M121 is the first version to require the new rust toolchain.
       # Partial revert of https://github.com/chromium/chromium/commit/3687976b0c6d36cf4157419a24a39f6770098d61
       # allowing us to use our rustc and our clang.
       ./patches/chromium-121-rust.patch
+    ] ++ lib.optionals (chromiumVersionAtLeast "126") [
+      # Rebased variant of patch right above to build M126+ with our rust and our clang.
+      ./patches/chromium-126-rust.patch
     ];
 
     postPatch = ''
diff --git a/pkgs/applications/networking/browsers/chromium/patches/chromium-126-llvm-17.patch b/pkgs/applications/networking/browsers/chromium/patches/chromium-126-llvm-17.patch
new file mode 100644
index 0000000000000..ea059d884b5a2
--- /dev/null
+++ b/pkgs/applications/networking/browsers/chromium/patches/chromium-126-llvm-17.patch
@@ -0,0 +1,29 @@
+diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
+index 6efe967eb0a1c..590a2c274ac13 100644
+--- a/build/config/compiler/BUILD.gn
++++ b/build/config/compiler/BUILD.gn
+@@ -568,24 +568,6 @@ config("compiler") {
+       }
+     }
+ 
+-    # TODO(crbug.com/40283598): This causes binary size growth and potentially
+-    # other problems.
+-    # TODO(crbug.com/40284925): 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/40192287): Investigate why/if this should be needed.
+     if (is_win) {
+       cflags += [ "/clang:-ffp-contract=off" ]
diff --git a/pkgs/applications/networking/browsers/chromium/patches/chromium-126-rust.patch b/pkgs/applications/networking/browsers/chromium/patches/chromium-126-rust.patch
new file mode 100644
index 0000000000000..776655babdd2a
--- /dev/null
+++ b/pkgs/applications/networking/browsers/chromium/patches/chromium-126-rust.patch
@@ -0,0 +1,21 @@
+diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
+index 6efe967eb0a1c..2ddae4efacbfa 100644
+--- a/build/config/compiler/BUILD.gn
++++ b/build/config/compiler/BUILD.gn
+@@ -1653,16 +1653,6 @@ config("runtime_library") {
+     configs += [ "//build/config/c++:runtime_library" ]
+   }
+ 
+-  # Rust and C++ both provide intrinsics for LLVM to call for math operations. We
+-  # want to use the C++ intrinsics, not the ones in the Rust compiler_builtins
+-  # library. The Rust symbols are marked as weak, so that they can be replaced by
+-  # the C++ symbols. This config ensures the C++ symbols exist and are strong in
+-  # order to cause that replacement to occur by explicitly linking in clang's
+-  # compiler-rt library.
+-  if (is_clang && toolchain_has_rust) {
+-    configs += [ "//build/config/clang:compiler_builtins" ]
+-  }
+-
+   # TODO(crbug.com/40570904): Come up with a better name for is POSIX + Fuchsia
+   # configuration.
+   if (is_posix || is_fuchsia) {