[C++] Add -c flag

5 files changed, 55 insertions, 9 deletions

diff --git a/Makefile b/Makefile
index 1641884..eba8db2 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,7 @@ CXX_SRCS:= \
 	file.cc \
 	file_cache.cc \
 	fileutil.cc \
+	flags.cc \
 	func.cc \
 	main.cc \
 	parser.cc \
diff --git a/exec.cc b/exec.cc
index d46541f..bc4497f 100644
--- a/exec.cc
+++ b/exec.cc
@@ -28,6 +28,7 @@
 #include "dep.h"
 #include "eval.h"
 #include "fileutil.h"
+#include "flags.h"
 #include "log.h"
 #include "string_piece.h"
 #include "strutil.h"
@@ -160,15 +161,17 @@ class Executor {
         printf("%s\n", runner->cmd->c_str());
         fflush(stdout);
       }
-      int result = system(runner->cmd->c_str());
-      if (result != 0) {
-        if (runner->ignore_error) {
-          fprintf(stderr, "[%.*s] Error %d (ignored)\n",
-                  SPF(runner->output), WEXITSTATUS(result));
-        } else {
-          fprintf(stderr, "*** [%.*s] Error %d\n",
-                  SPF(runner->output), WEXITSTATUS(result));
-          exit(1);
+      if (!g_is_syntax_check_only) {
+        int result = system(runner->cmd->c_str());
+        if (result != 0) {
+          if (runner->ignore_error) {
+            fprintf(stderr, "[%.*s] Error %d (ignored)\n",
+                    SPF(runner->output), WEXITSTATUS(result));
+          } else {
+            fprintf(stderr, "*** [%.*s] Error %d\n",
+                    SPF(runner->output), WEXITSTATUS(result));
+            exit(1);
+          }
         }
       }
       delete runner;
diff --git a/flags.cc b/flags.cc
new file mode 100644
index 0000000..0c611df
--- /dev/null
+++ b/flags.cc
@@ -0,0 +1,19 @@
+// Copyright 2015 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.
+
+// +build ignore
+
+#include "flags.h"
+
+bool g_is_syntax_check_only;
diff --git a/flags.h b/flags.h
new file mode 100644
index 0000000..570d6b1
--- /dev/null
+++ b/flags.h
@@ -0,0 +1,20 @@
+// Copyright 2015 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.
+
+#ifndef FLAGS_H_
+#define FLAGS_H_
+
+extern bool g_is_syntax_check_only;
+
+#endif  // FLAGS_H_
diff --git a/main.cc b/main.cc
index a8a6f11..3bb9fe6 100644
--- a/main.cc
+++ b/main.cc
@@ -26,6 +26,7 @@
 #include "file.h"
 #include "file_cache.h"
 #include "fileutil.h"
+#include "flags.h"
 #include "func.h"
 #include "log.h"
 #include "parser.h"
@@ -43,6 +44,8 @@ static void ParseCommandLine(int argc, char* argv[],
     const char* arg = argv[i];
     if (!strcmp(arg, "-f")) {
       g_makefile = argv[++i];
+    } else if (!strcmp(arg, "-c")) {
+      g_is_syntax_check_only = true;
     } else if (arg[0] == '-') {
       ERROR("Unknown flag: %s", arg);
     } else {