Revert `MRUBY_TARGET` mechanism; ref #5096

* In explanation of mruby, the expression `build_config.rb` is frequently
  used including official documents, so I think that it will not make sense
  if the file is no longer used.
* The `MRUBY_TARGET` mechanism seems to have little improvement, so I don't
  think it should be changed to avoid unnecessary confusion.
* `MRUBY_TARGET` and `MRuby.targets` represent somewhat different things,
  so using the same term "target" is a bit confusing.

The mechanism that can be written short when using a file under
`build_config` (renamed from `target`) directory remains
(`build_config/${MRUBY_CONFIG}.rb` is used if the path specified
in `MRUBY_CONFIG` doesn't exist).

1 files changed, 39 insertions, 0 deletions

diff --git a/build_config/travis.rb b/build_config/travis.rb
new file mode 100644
index 000000000..58a739ce6
--- /dev/null
+++ b/build_config/travis.rb
@@ -0,0 +1,39 @@
+MRuby::Build.new('full-debug') do |conf|
+  toolchain :gcc
+  enable_debug
+
+  # include all core GEMs
+  conf.gembox 'full-core'
+  conf.cc.flags += %w(-Werror=declaration-after-statement)
+  conf.cc.defines += %w(MRB_GC_STRESS MRB_ENABLE_DEBUG_HOOK)
+
+  conf.enable_test
+end
+
+MRuby::Build.new do |conf|
+  toolchain :gcc
+
+  # include all core GEMs
+  conf.gembox 'full-core'
+  conf.cc.flags += %w(-Werror=declaration-after-statement)
+  conf.compilers.each do |c|
+    c.defines += %w(MRB_GC_FIXED_ARENA)
+  end
+  conf.enable_bintest
+  conf.enable_test
+end
+
+MRuby::Build.new('cxx_abi') do |conf|
+  toolchain :gcc
+
+  conf.gembox 'full-core'
+  conf.cc.flags += %w(-fpermissive)
+  conf.compilers.each do |c|
+    c.defines += %w(MRB_GC_FIXED_ARENA)
+  end
+  conf.enable_test
+
+  enable_cxx_abi
+
+  build_mrbc_exec
+end