add subprocess-spawning to msvc_helper

Rather than using subprocess.h, reimplement the subprocess code.
This allows:
1) using anonymous (instead of named) pipes
2) not using all the completion port craziness
3) printing the output as it happens
4) further variation, like adjusting the environment (in a forthcoming
   change) without affecting the main subprocess code

1 files changed, 10 insertions, 0 deletions

diff --git a/src/msvc_helper_test.cc b/src/msvc_helper_test.cc
index 9eb3c89..8db4c69 100644
--- a/src/msvc_helper_test.cc
+++ b/src/msvc_helper_test.cc
@@ -30,3 +30,13 @@ TEST(MSVCHelperTest, ShowIncludes) {
             CLWrapper::FilterShowIncludes("Note: including file:    "
                                           "c:\\initspaces.h"));
 }
+
+TEST(MSVCHelperTest, Run) {
+  CLWrapper cl;
+  string output;
+  cl.Run("cmd /c \"echo foo&& echo Note: including file:  foo.h&&echo bar\"",
+         &output);
+  ASSERT_EQ("foo\nbar\n", output);
+  ASSERT_EQ(1u, cl.includes_.size());
+  ASSERT_EQ("foo.h", cl.includes_[0]);
+}