Add custom toolchain option (#110)

Fixed #48

Signed-off-by: Hidenori Matsubayashi <hidenori.matsubayashi@gmail.com>

lib/commands/build.dart

@@ -60,6 +60,11 @@ class BuildPackageCommand extends BuildSubCommand
           'the app is compiled. This option is valid only '
           'if the current host and target architectures are different.',
     );
+    argParser.addOption(
+      'target-toolchain',
+      defaultsTo: '/',
+      help: 'The toolchain path for Clang.',
+    );
     argParser.addOption(
       'system-include-directories',
       defaultsTo: null,
@@ -120,8 +125,9 @@ class BuildPackageCommand extends BuildSubCommand
       targetBackendType: stringArg('target-backend-type'),
       targetCompilerTriple: stringArg('target-compiler-triple'),
       targetSysroot: stringArg('target-sysroot'),
-      systemIncludeDirectories: stringArg('system-include-directories'),
       targetCompilerFlags: stringArg('target-compiler-flags'),
+      targetToolchain: stringArg('target-toolchain'),
+      systemIncludeDirectories: stringArg('system-include-directories'),
     );
     validateBuild(eLinuxBuildInfo);
     displayNullSafetyMode(buildInfo);

lib/elinux_build_target.dart

@@ -357,6 +357,7 @@ class NativeBundle {
     final String targetCompilerTriple = buildInfo.targetCompilerTriple;
     final String targetSysroot = buildInfo.targetSysroot;
     final String targetCompilerFlags = buildInfo.targetCompilerFlags;
+    final String targetToolchain = buildInfo.targetToolchain;
     final String systemIncludeDirectories = buildInfo.systemIncludeDirectories;
     RunResult result = await _processUtils.run(
       <String>[
@@ -378,7 +379,12 @@ class NativeBundle {
         eLinuxDir.path,
       ],
       workingDirectory: outputDir.path,
-      environment: <String, String>{'CC': 'clang', 'CXX': 'clang++'},
+      environment: (targetToolchain == null)
+          ? <String, String>{'CC': 'clang', 'CXX': 'clang++'}
+          : <String, String>{
+              'CC': '$targetToolchain/bin/clang',
+              'CXX': '$targetToolchain/bin/clang++'
+            },
     );
     if (result.exitCode != 0) {
       throwToolExit('Failed to cmake:\n$result');

lib/elinux_builder.dart

@@ -37,8 +37,9 @@ class ELinuxBuildInfo {
     @required this.targetBackendType,
     @required this.targetCompilerTriple,
     @required this.targetSysroot,
-    @required this.systemIncludeDirectories,
     @required this.targetCompilerFlags,
+    @required this.targetToolchain,
+    @required this.systemIncludeDirectories,
   })  : assert(targetArch != null),
         assert(targetBackendType != null);
 
@@ -47,8 +48,9 @@ class ELinuxBuildInfo {
   final String targetBackendType;
   final String targetCompilerTriple;
   final String targetSysroot;
-  final String systemIncludeDirectories;
   final String targetCompilerFlags;
+  final String targetToolchain;
+  final String systemIncludeDirectories;
 }
 
 /// See:

lib/elinux_device.dart

@@ -299,8 +299,9 @@ class ELinuxDevice extends Device {
       targetBackendType: _backendType,
       targetCompilerTriple: null,
       targetSysroot: '/',
-      systemIncludeDirectories: null,
       targetCompilerFlags: null,
+      targetToolchain: null,
+      systemIncludeDirectories: null,
     );
     await ELinuxBuilder.buildBundle(
       project: project,