tree 33b466a55eca0833792cbe3eae98e85f018fb5a5
parent 46ad4c45254d1d72d25a36f1ef3fd61694e34f49
author Adam Lesinski <adamlesinski@google.com> 1594939101 -0700
committer Commit Bot <commit-bot@chromium.org> 1595027686 +0000

[rust] Write {{sources}} ninja variable for Rust targets

Rust compiles a crate using all source files in a single command.
However, rustc only requires the source_root, and then traverses
the series of `mod` statements and `include_str!` macros to find
all the source files.

On Fuchsia, it is desired to enforce that all Rust source files
are listed explicitly in BUILD.gn files.

In order to make it possible to enforce that the list matches
the depfile rustc emits, the set of source files needs to be
accessible in the `tool` target for `rust_bin`, `rust_library`, etc.

This change writes the source files to a new ninja variable
`sources`. `inputs` are also included in this variable, since a
Rust crate can read non-rust files at build-time
(eg. `include_str!("foo.json")`).

Change-Id: I076232739c54b78508db13549a3db4894b16ea11
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/9360
Reviewed-by: Tyler Mandry <tmandry@google.com>
Reviewed-by: Petr Hosek <phosek@google.com>
Commit-Queue: Petr Hosek <phosek@google.com>