Add linux_musl arm+arm64

Add toolchains to support cross compiling to aarch64-linux-musl and
arm-linux-musleabihf.

Bug: 236052820
Test: build arm and arm64 musl sysroots
Change-Id: I47a9322929baff2492c6e8db989ece01fcbeb133

cc/config/arm_linux_host.go

@@ -0,0 +1,174 @@
+// Copyright 2022 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import "android/soong/android"
+
+var (
+	linuxArmCflags = []string{
+		"-march=armv7a",
+	}
+
+	linuxArm64Cflags = []string{}
+
+	linuxArmLdflags = []string{
+		"-march=armv7a",
+	}
+
+	linuxArm64Ldflags = []string{}
+)
+
+func init() {
+	exportedVars.ExportStringListStaticVariable("LinuxArmCflags", linuxArmCflags)
+	exportedVars.ExportStringListStaticVariable("LinuxArm64Cflags", linuxArm64Cflags)
+	exportedVars.ExportStringListStaticVariable("LinuxArmLdflags", linuxArmLdflags)
+	exportedVars.ExportStringListStaticVariable("LinuxArmLldflags", linuxArmLdflags)
+	exportedVars.ExportStringListStaticVariable("LinuxArm64Ldflags", linuxArm64Ldflags)
+	exportedVars.ExportStringListStaticVariable("LinuxArm64Lldflags", linuxArm64Ldflags)
+
+	exportedVars.ExportStringListStaticVariable("LinuxArmYasmFlags", []string{"-f elf32 -m arm"})
+	exportedVars.ExportStringListStaticVariable("LinuxArm64YasmFlags", []string{"-f elf64 -m aarch64"})
+
+}
+
+// Musl arm+arm64
+type toolchainLinuxArm struct {
+	toolchain32Bit
+	toolchainLinux
+}
+
+type toolchainLinuxArm64 struct {
+	toolchain64Bit
+	toolchainLinux
+}
+
+func (t *toolchainLinuxArm) Name() string {
+	return "arm"
+}
+
+func (t *toolchainLinuxArm64) Name() string {
+	return "arm64"
+}
+
+func (t *toolchainLinuxArm) Cflags() string {
+	return "${config.LinuxCflags} ${config.LinuxArmCflags}"
+}
+
+func (t *toolchainLinuxArm) Cppflags() string {
+	return ""
+}
+
+func (t *toolchainLinuxArm64) Cflags() string {
+	return "${config.LinuxCflags} ${config.LinuxArm64Cflags}"
+}
+
+func (t *toolchainLinuxArm64) Cppflags() string {
+	return ""
+}
+
+func (t *toolchainLinuxArm) Ldflags() string {
+	return "${config.LinuxLdflags} ${config.LinuxArmLdflags}"
+}
+
+func (t *toolchainLinuxArm) Lldflags() string {
+	return "${config.LinuxLldflags} ${config.LinuxArmLldflags}"
+}
+
+func (t *toolchainLinuxArm64) Ldflags() string {
+	return "${config.LinuxLdflags} ${config.LinuxArm64Ldflags}"
+}
+
+func (t *toolchainLinuxArm64) Lldflags() string {
+	return "${config.LinuxLldflags} ${config.LinuxArm64Lldflags}"
+}
+
+func (t *toolchainLinuxArm) YasmFlags() string {
+	return "${config.LinuxArmYasmFlags}"
+}
+
+func (t *toolchainLinuxArm64) YasmFlags() string {
+	return "${config.LinuxArm64YasmFlags}"
+}
+
+func (toolchainLinuxArm) LibclangRuntimeLibraryArch() string {
+	return "arm"
+}
+
+func (toolchainLinuxArm64) LibclangRuntimeLibraryArch() string {
+	return "arm64"
+}
+
+func (t *toolchainLinuxArm) InstructionSetFlags(isa string) (string, error) {
+	// TODO: Is no thumb OK?
+	return t.toolchainBase.InstructionSetFlags("")
+}
+
+type toolchainLinuxMuslArm struct {
+	toolchainLinuxArm
+	toolchainMusl
+}
+
+type toolchainLinuxMuslArm64 struct {
+	toolchainLinuxArm64
+	toolchainMusl
+}
+
+func (t *toolchainLinuxMuslArm) ClangTriple() string {
+	return "arm-linux-musleabihf"
+}
+
+func (t *toolchainLinuxMuslArm) Cflags() string {
+	return t.toolchainLinuxArm.Cflags() + " " + t.toolchainMusl.Cflags()
+}
+
+func (t *toolchainLinuxMuslArm) Ldflags() string {
+	return t.toolchainLinuxArm.Ldflags() + " " + t.toolchainMusl.Ldflags()
+}
+
+func (t *toolchainLinuxMuslArm) Lldflags() string {
+	return t.toolchainLinuxArm.Lldflags() + " " + t.toolchainMusl.Lldflags()
+}
+
+func (t *toolchainLinuxMuslArm64) ClangTriple() string {
+	return "aarch64-linux-musl"
+}
+
+func (t *toolchainLinuxMuslArm64) Cflags() string {
+	return t.toolchainLinuxArm64.Cflags() + " " + t.toolchainMusl.Cflags()
+}
+
+func (t *toolchainLinuxMuslArm64) Ldflags() string {
+	return t.toolchainLinuxArm64.Ldflags() + " " + t.toolchainMusl.Ldflags()
+}
+
+func (t *toolchainLinuxMuslArm64) Lldflags() string {
+	return t.toolchainLinuxArm64.Lldflags() + " " + t.toolchainMusl.Lldflags()
+}
+
+var toolchainLinuxMuslArmSingleton Toolchain = &toolchainLinuxMuslArm{}
+var toolchainLinuxMuslArm64Singleton Toolchain = &toolchainLinuxMuslArm64{}
+
+func linuxMuslArmToolchainFactory(arch android.Arch) Toolchain {
+	return toolchainLinuxMuslArmSingleton
+}
+
+func linuxMuslArm64ToolchainFactory(arch android.Arch) Toolchain {
+	return toolchainLinuxMuslArm64Singleton
+}
+
+func init() {
+	registerToolchainFactory(android.LinuxMusl, android.Arm, linuxMuslArmToolchainFactory)
+	registerToolchainFactory(android.LinuxMusl, android.Arm64, linuxMuslArm64ToolchainFactory)
+}