skslc can now take a `.worklist` file as an input, containing multiple
"command lines" to run in sequence. compile_sksl_tests.py now assembles
a worklist file and runs skslc one time, rather than running skslc
once per each target. This improves compile times on Windows
significantly (where spawning skslc hundreds of times is much more
expensive than on Linux/Mac).
One subtle behavioral difference with .worklist files: if an error is
encountered, it is written to the output file instead of to stdout.
Previously, compile_sksl_tests was in charge of for capturing stdout
and overwriting the compiler output with the error message, but this
doesn't work when many files are being compiled (which errors are
associated with which files?)
This refactor exposed a minor latent bug--when encountering an error,
skslc would previously exit() immediately without closing its
FileOutputStream. This led to an assertion when exit() was replaced with
normal returns. Since FileOutputStream is only used by skslc, and in
every case the desired behavior is just to close the stream cleanly,
FileOutputStream now closes the file in its destructor instead of
asserting that we haven't done so.
Change-Id: Ia55baff0c11fe466923bde2e0c944df9f2ccd092
Bug: skia:10919
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/334099
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
a1e8fe3a2b