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.]

diff --git a/src/graph.cc b/src/graph.cc
index 9b5f10b..82716aa 100644 (file)
--- a/src/graph.cc
+++ b/src/graph.cc
@@ -150,10 +150,6 @@ bool Edge::LoadDepFile(State* state, DiskInterface* disk_interface,
   }
 
   // Check that this depfile matches our output.
-  if (outputs_.size() != 1) {
-    *err = "expected only one output";
-    return false;
-  }
   if (outputs_[0]->file_->path_ != makefile.out_) {
     *err = "expected makefile to mention '" + outputs_[0]->file_->path_ + "', "
            "got '" + makefile.out_ + "'";

diff --git a/src/parsers.cc b/src/parsers.cc
index 7f587a6..35790b2 100644 (file)
--- a/src/parsers.cc
+++ b/src/parsers.cc
@@ -471,13 +471,6 @@ bool ManifestParser::ParseEdge(string* err) {
   if (!rule)
     return tokenizer_.Error("unknown build rule '" + rule_name + "'", err);
 
-  if (!rule->depfile_.empty()) {
-    if (outs.size() > 1) {
-      return tokenizer_.Error("dependency files only work with single-output "
-                           "rules", err);
-    }
-  }
-
   for (;;) {
     string in;
     if (!tokenizer_.ReadIdent(&in))

diff --git a/src/parsers_test.cc b/src/parsers_test.cc
index 1ac5990..12f09b0 100644 (file)
--- 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);
   }
 
   {