This hooks up build flags from the command-line and the toolchain (for re-invoking the build).

Using this, I was able to make the NaCl build of base compile (if the correct NaCl toolchain is extracted in advance to the right location).

This is the first time I actually ran a cross-compile, and Ninja complained about duplicate rule definitions, so I now prefix rules in the non-default toolchain with the toolchain name. There were also some files that went in the wrong directory.

I moved the toolchain definitions from the other platforms into a new directory tree in build/toolchains to be more clear.

To make the toolchain args get passed to the build configuration, I had to add another state to the toolchain_manager's state machine, since we need to see those flags before starting that part of the build. This is described in more detail at the top of the .cc file.

Since I was moving stuff around, I wanted to find references to the thing I was moving, so wrote a new command to find places that reference a given target "gn refs".

I added new help for patterns since I used these for the new "refs" command.

I removed the requirement that declare_args only be called once in a given scope. It now can be used anywhere to facilitate module-specific arguments.

Because build arguments can now be declared anywhere, I added a "gn args" command-line command that will find and print all of the command line arguments passed into the build. It also prints the comment above the argument as a way to document it. The code to extract the comment is a but unfortunate. I think if/when we write an autoformatter, we'll need to incorporate comments into the parse tree more and this can be simplified greatly.

Fixes up build.ninja dependencies if you remove a buildfile. Because I specified all input buildfiles in build.ninja, it would fail if you removed any of them. I now write out the build deps (for regenerating the build) in a .d file which will tolerate missing files.

BUG=
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/22998003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@218320 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/gn/ninja_target_writer.h b/tools/gn/ninja_target_writer.h
index 1964da3..4662200 100644
--- a/tools/gn/ninja_target_writer.h
+++ b/tools/gn/ninja_target_writer.h
@@ -28,6 +28,9 @@ class NinjaTargetWriter {
  protected:
   void WriteEnvironment();
 
+  // Returns the toolchain associated with the target.
+  const Toolchain* GetToolchain() const;
+
   const Settings* settings_;  // Non-owning.
   const Target* target_;  // Non-owning.
   std::ostream& out_;