ruby.c: accept --disable-jit option

by promoting jit to feature flag.

mjit.h: update comment about mjit_opts.on

test_rubyoptions.rb: add test for switching JIT enablement

"--jit" flag usage may be deprecated later, but not discussed yet.

[Feature #14878]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63995 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/mjit.h b/mjit.h
index a2a085c720..4f38ed90a7 100644
--- a/mjit.h
+++ b/mjit.h
@@ -27,7 +27,9 @@ enum rb_mjit_iseq_func {
 
 /* MJIT options which can be defined on the MRI command line.  */
 struct mjit_options {
-    char on; /* flag of MJIT usage  */
+    /* Converted from "jit" feature flag to tell the enablement
+       information to ruby_show_version().  */
+    char on;
     /* Save temporary files after MRI finish.  The temporary files
        include the pre-compiled header, C code file generated for ISEQ,
        and the corresponding object file.  */