diff --git a/src/build/config/BUILDCONFIG.gn b/src/build/config/BUILDCONFIG.gn
index 26fad5adf9..7a03cb09f1 100644
--- a/src/build/config/BUILDCONFIG.gn
+++ b/src/build/config/BUILDCONFIG.gn
@@ -274,6 +274,8 @@ if (target_os == "android") {
_default_toolchain = "//build/toolchain/aix:$target_cpu"
} else if (target_os == "zos") {
_default_toolchain = "//build/toolchain/zos:$target_cpu"
+} else if (target_os == "openwrt") {
+ _default_toolchain = "//build/toolchain/openwrt:$target_cpu"
} else {
assert(false, "Unsupported target_os: $target_os")
}
@@ -308,7 +310,7 @@ is_android = current_os == "android"
is_chromeos = current_os == "chromeos"
is_fuchsia = current_os == "fuchsia"
is_ios = current_os == "ios"
-is_linux = current_os == "linux"
+is_linux = current_os == "linux" || current_os == "openwrt"
is_mac = current_os == "mac"
is_nacl = current_os == "nacl"
is_win = current_os == "win" || current_os == "winuwp"
diff --git a/src/build/config/compiler/BUILD.gn b/src/build/config/compiler/BUILD.gn
index 4e8f218ab3..6fa7fa191d 100644
--- a/src/build/config/compiler/BUILD.gn
+++ b/src/build/config/compiler/BUILD.gn
@@ -303,6 +303,9 @@ config("compiler") {
configs += [ "//build/config/android:compiler" ]
} else if (is_linux || is_chromeos) {
configs += [ "//build/config/linux:compiler" ]
+ if (current_os == "openwrt") {
+ configs += [ "//build/config/openwrt:compiler" ]
+ }
} else if (is_nacl) {
configs += [ "//build/config/nacl:compiler" ]
} else if (is_mac) {
@@ -1203,7 +1206,8 @@ config("compiler_cpu_abi") {
}
} else if (current_cpu == "arm") {
if (is_clang && !is_android && !is_nacl &&
- !(is_chromeos_lacros && is_chromeos_device)) {
+ !(is_chromeos_lacros && is_chromeos_device) &&
+ current_os != "openwrt") {
cflags += [ "--target=arm-linux-gnueabihf" ]
ldflags += [ "--target=arm-linux-gnueabihf" ]
}
@@ -1223,7 +1227,8 @@ config("compiler_cpu_abi") {
}
} else if (current_cpu == "arm64") {
if (is_clang && !is_android && !is_nacl && !is_fuchsia &&
- !(is_chromeos_lacros && is_chromeos_device)) {
+ !(is_chromeos_lacros && is_chromeos_device) &&
+ current_os != "openwrt") {
cflags += [ "--target=aarch64-linux-gnu" ]
ldflags += [ "--target=aarch64-linux-gnu" ]
}
@@ -1232,7 +1237,7 @@ config("compiler_cpu_abi") {
}
} else if (current_cpu == "mipsel" && !is_nacl) {
ldflags += [ "-Wl,--hash-style=sysv" ]
- if (custom_toolchain == "") {
+ if (custom_toolchain == "" && current_os != "openwrt") {
if (is_clang) {
if (is_android) {
cflags += [ "--target=mipsel-linux-android" ]
@@ -1379,7 +1384,7 @@ config("compiler_cpu_abi") {
} else if (current_cpu == "mips64el") {
cflags += [ "-D__SANE_USERSPACE_TYPES__" ]
ldflags += [ "-Wl,--hash-style=sysv" ]
- if (custom_toolchain == "") {
+ if (custom_toolchain == "" && current_os != "openwrt") {
if (is_clang) {
if (is_android) {
cflags += [ "--target=mips64el-linux-android" ]
@@ -1487,7 +1492,7 @@ config("compiler_cpu_abi") {
ldflags += [ "-m64" ]
}
} else if (current_cpu == "riscv64") {
- if (is_clang && !is_android) {
+ if (is_clang && !is_android && current_os != "openwrt") {
cflags += [ "--target=riscv64-linux-gnu" ]
ldflags += [ "--target=riscv64-linux-gnu" ]
}
diff --git a/src/build/config/openwrt/BUILD.gn b/src/build/config/openwrt/BUILD.gn
new file mode 100644
index 0000000000..7ad8ede3e7
--- /dev/null
+++ b/src/build/config/openwrt/BUILD.gn
@@ -0,0 +1,86 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/c++/c++.gni")
+import("//build/config/compiler/compiler.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+
+if (current_toolchain == default_toolchain) {
+ import("//build/toolchain/concurrent_links.gni")
+}
+
+assert(current_os == "openwrt")
+
+declare_args() {
+ build_static = false
+
+ no_madvise_syscall = false
+}
+
+# This is included by reference in the //build/config/compiler config that
+# is applied to all targets. It is here to separate out the logic that is
+# Android-only.
+config("compiler") {
+ cflags = []
+ ldflags = []
+
+ defines = [
+ "_LIBCPP_HAS_MUSL_LIBC",
+ "__UCLIBC__",
+ "__MUSL__",
+ ]
+
+ if (build_static) {
+ # Musl static objects are not built with -fPIC, cannot use -static-pie.
+ ldflags += [ "-static" ]
+ } else if (current_cpu == "x86") {
+ ldflags += [ "-Wl,--dynamic-linker=/lib/ld-musl-i386.so.1" ]
+ } else if (current_cpu == "mipsel") {
+ ldflags += [ "-Wl,--dynamic-linker=/lib/ld-musl-mipsel-sf.so.1" ]
+ }
+
+ if (no_madvise_syscall) {
+ defines += [ "NO_MADVISE_SYSCALL" ]
+ }
+
+ abi = "musl"
+ if (current_cpu == "arm") {
+ abi = "musleabi"
+ arch = "arm"
+ } else if (current_cpu == "arm64") {
+ arch = "aarch64"
+ } else if (current_cpu == "x86") {
+ arch = "i486"
+ } else if (current_cpu == "x64") {
+ arch = "x86_64"
+ } else if (current_cpu == "mipsel") {
+ arch = "mipsel"
+ } else if (current_cpu == "mips64el") {
+ arch = "mips64el"
+ } else if (current_cpu == "riscv64") {
+ arch = "riscv64"
+ } else {
+ assert(false, "Architecture not supported")
+ }
+ cflags += [
+ "--target=$arch-openwrt-linux-$abi",
+
+ # musl malloc() alignment is 4*sizeof(size_t), i.e.
+ # 16 bytes on 32-bit CPUs, and 32 bytes on 64-bit CPUs. See
+ # https://git.musl-libc.org/cgit/musl/tree/src/malloc/oldmalloc/malloc_impl.h
+ # And https://www.openwall.com/lists/musl/2019/07/07/2 for its rationale.
+ # But Clang is unaware of this information and produces
+ # #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 4U
+ # for the i486-openwrt-linux-musl target.
+ # This further causes static_asserts in
+ # src/third_party/protobuf/src/google/protobuf/arenastring.cc to fail.
+ # However, PartitionAlloc does not support larger than 16 alignment.
+ "-fnew-alignment=16",
+ ]
+ ldflags += [ "--target=$arch-openwrt-linux-$abi" ]
+
+ # Assign any flags set for the C compiler to asmflags so that they are sent
+ # to the assembler.
+ asmflags = cflags
+}
diff --git a/src/build/toolchain/openwrt/BUILD.gn b/src/build/toolchain/openwrt/BUILD.gn
new file mode 100644
index 0000000000..d05b4503d7
--- /dev/null
+++ b/src/build/toolchain/openwrt/BUILD.gn
@@ -0,0 +1,15 @@
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/sysroot.gni")
+import("//build/toolchain/gcc_toolchain.gni")
+
+assert(target_os == "openwrt")
+
+clang_toolchain(target_cpu) {
+ toolchain_args = {
+ current_cpu = target_cpu
+ current_os = "openwrt"
+ }
+}