Add ninja generator flag for writing library deps.

pylib/gyp/generator/ninja.py

Index: pylib/gyp/generator/ninja.py
diff --git a/pylib/gyp/generator/ninja.py b/pylib/gyp/generator/ninja.py
index b7dbd521c37ad7c77c8b059132d2f33a6c3eabd0..8010fd107128324843fc5f243ec293d0b0e1baa6 100644
--- a/pylib/gyp/generator/ninja.py
+++ b/pylib/gyp/generator/ninja.py
@@ -210,7 +210,7 @@ class Target:
 class NinjaWriter:
   def __init__(self, qualified_target, target_outputs, base_dir, build_dir,
                output_file, toplevel_build, output_file_name, flavor,
-               toplevel_dir=None):
+               deps_file_name=None, toplevel_dir=None):

[Nico, 2013/09/10 21:58:02]

rename to deps_file

     """
     base_dir: path from source root to directory containing this gyp file,
               by gyp semantics, all input paths are relative to this
@@ -245,6 +245,14 @@ class NinjaWriter:
     base_to_top = gyp.common.InvertRelativePath(base_dir, toplevel_dir)
     self.base_to_build = os.path.join(base_to_top, build_dir)
 
+    # The self.link_deps_file will either be a file object if the file is
+    # requested, or it will be false if not. This file should contain a
+    # mapping from target to the list of library dependencies it has.
+    if deps_file_name:
+      self.link_deps_file = open(deps_file_name, 'ab')
+    else:
+      self.link_deps_file = None

[Nico, 2013/09/10 21:58:02]

remove most of this, and just keep `self.link_deps_file = deps_file`

+
   def ExpandSpecial(self, path, product_dir=None):
     """Expand specials like $!PRODUCT_DIR in |path|.
 
@@ -975,6 +983,13 @@ class NinjaWriter:
           continue
         linkable = target.Linkable()
         if linkable:
+          if self.link_deps_file:
+            # Save the mapping of link deps.
+            self.link_deps_file.write(self.qualified_target)
+            self.link_deps_file.write(' ')
+            self.link_deps_file.write(target.binary)
+            self.link_deps_file.write('\n')
+
           if (self.flavor == 'win' and
               target.component_objs and
               self.msvs_settings.IsUseLibraryDependencyInputs(config_name)):
@@ -2019,10 +2034,18 @@ def GenerateOutputForConfig(target_list, target_dicts, data, params,
       obj += '.' + toolset
     output_file = os.path.join(obj, base_path, name + '.ninja')
 
+    # Extract the optional link deps file name.
+    LINK_DEPS_FILE = 'link_deps_file'
+    if LINK_DEPS_FILE in generator_flags:
+      link_deps_file = generator_flags.get(LINK_DEPS_FILE)

[Nico, 2013/09/10 21:58:02]

Do link_deps_file = open(gen…ILE), 'wb') here

+    else:
+      link_deps_file = None
+
     writer = NinjaWriter(qualified_target, target_outputs, base_path, build_dir,
                          OpenOutput(os.path.join(toplevel_build, output_file)),
                          toplevel_build, output_file,
-                         flavor, toplevel_dir=options.toplevel_dir)
+                         flavor, link_deps_file,
+                         toplevel_dir=options.toplevel_dir)
     master_ninja.subninja(output_file)
 
     target = writer.WriteSpec(spec, config_name, generator_flags)