Add depfile support to build command with multiple outputs (Fixes: #61)

parsers.cpp: allow depfile used at build command with multiple outputs.
graph.cpp: allow depfile used at build command with multiple outputs.
parsers_test.cpp: make the test pass.

As before, the depfile itself can only mention one target, which must
be the first of a build command with multiple outpus.

[There is really no need to mention all the output in the depfile,
because all targets should depend on exactly the same files anyway,
because these targets are built by a single build command.]

1 files changed, 2 insertions, 3 deletions

diff --git a/src/parsers_test.cc b/src/parsers_test.cc
index 1ac5990..12f09b0 100644
--- a/src/parsers_test.cc
+++ b/src/parsers_test.cc
@@ -316,11 +316,10 @@ TEST_F(ParserTest, Errors) {
     State state;
     ManifestParser parser(&state, NULL);
     string err;
-    EXPECT_FALSE(parser.Parse("rule cc\n  command = foo\n  depfile = bar\n"
+    EXPECT_TRUE(parser.Parse("rule cc\n  command = foo\n  depfile = bar\n"
                               "build a.o b.o: cc c.cc\n",
                               &err));
-    EXPECT_EQ("line 4, col 16: dependency files only work with "
-              "single-output rules", err);
+    EXPECT_EQ("", err);
   }
 
   {