This has a few advantages:
- We can track dependencies more precisely
- ninja can assemble things in parallel as they're ready rather than
sequentially all at once.
- It is easier to customize SDKs depending on target platform, e.g.
Fuchsia.
This CL also has a number of cleanups:
- Defining is_fuchsia and is_fuchsia host so we don't always have to check
- Piping through toolchain overrides in more places
- Fixing bugs in copy_tree.py, not using list_files.py, which is broken on Windows
related #29558R=whesse@google.com
Review-Url: https://codereview.chromium.org/2848943003 .
This change:
- Sucks in gn binaries
- Sucks in a version of llvm that the GN build likes
- Adds tools/gn.py to invoke gn
- Adds a root BUILD.gn and .gn file
- Removes chrome boilerplate we don't need
- etc.
This lets us do a standalone build of the 'runtime'
target for x64, ia32, arm, arm64, mips, and the
simulators on Linux, and arm and arm64 on Android.
It does not include tcmalloc, and hasn't been tested
on Mac or Windows. That work and more cleanup of
chrome boilerplate will come in follow-up CLs.
R=johnmccutchan@google.com
Review URL: https://codereview.chromium.org/2350583002 .
Zachary Anderson