New features

• Now compatible with ninja 1.9.0 features.
  • dupbuild=err is now the default.
  • Nanosecond resolution timestamps in .ninja_deps (version 4) and .ninja_log.
  • --verbose is now a synonym for -v.
  • -j 0 is now handled by allowing unlimited jobs.

Performance

• Use getc_unlocked in scanner, improving parse time considerably for huge inputs such as chromium.

Bug fixes

• Paths in default lines weren't getting canonicalized, resulting in an error if the target was not in canonical form (for example, default $builddir/foo, where builddir = .).
• Escaped newlines weren't getting handled correctly when they appeared in between non-path tokens.
• Lookup variables in rule before parent environment, as documented in the ninja manual (ninja's actual behavior depends on whether an edge has any bindings).

Cleanups

• Rewrote arg.h to be simpler.
• Updated tree.c implementation to new musl version (faster and smaller code).
• Rewrote htab.c to be simpler and better tailored to our needs.
• Simplified error handling a bit.