- Defer YAML library and lock file loading until needed.
- Don't write empty parts into lock file.
- Extract code to read/write lock file to `MRuby::Lockfile`.
- `MRuby::Lockfile.disable` disables the use of lock file.
If $rake_root_fiber is used, sh runs command in another Fiber. If
command is ran in another Fiber, "rescue RuntimEerror" can't rescue
exception for system(...) failure.
How to reproduce:
$ CC="gcc -std=gnu99" ./minirake
(in /home/kou/work/ruby/mruby.kou)
CC mrbgems/mruby-compiler/core/codegen.c -> build/test/mrbgems/mruby-compiler/core/codegen.o
sh: 1: gcc -std=gnu99: not found
rake aborted!
Command Failed: ["gcc -std=gnu99" -g -std=gnu99 ...]
take-cheeze