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dearblue
db1578c123
The issue resolved by the preceding patch was solely the C++ exception task within the mruby core. This patch aims to resolve a similar sequencing issue that also exists in GEMS. In practice, `mruby-compiler` is sometimes loaded via dependencies rather than being explicitly specified in the build configuration file. In such cases, when `mruby-compiler/mrbgem.rake` is loaded, it is not yet determined whether C++ exceptions will be used. Consequently, even if it later becomes clear that `core/codegen-cxx.cxx` and `core/y.tab-cxx.cxx` are required, the system could not handle this. To resolve this issue, we introduce the `MRuby::Gem::Specification#build_settings` method as a mechanism for lazily evaluating build setup. However, for backward compatibility, the commands are cloned twice in `gem.setup` and `gem.setup_build`. This is because many existing GEMS configure commands directly within the setup block. ref. https://github.com/mruby/mruby/issues/6615
