[ruby-core:76883] [Ruby trunk Bug#12411] Warnings when compiling transcode.c on cygwin

Issue #12411 has been updated by Tomoyuki Chikanaga.

Backport changed from 2.1: WONTFIX, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: WONTFIX, 2.2: REQUIRED, 2.3: DONE

ruby_2_3 r55903 merged revision(s) 55115.

----------------------------------------
Bug #12411: Warnings when compiling transcode.c on cygwin
https://bugs.ruby-lang.org/issues/12411#change-60105

* Author: Martin Dürst
* Status: Closed
* Priority: Normal
* Assignee: Yui NARUSE
* ruby -v: ruby 2.4.0dev (2016-05-22 trunk 55111) [x86_64-cygwin]
* Backport: 2.1: WONTFIX, 2.2: REQUIRED, 2.3: DONE
----------------------------------------
When compiling ruby trunk, the compilation of transcode produces the warnings below.
There's also a similar warning for dbm.c and a lot of them in some tkl files.

```
compiling transcode.c
In file included from ./include/ruby.h:33:0,
                 from internal.h:15,
                 from transcode.c:12:
transcode.c: In function ‘econv_args’:
transcode.c:3007:44: warning: initialization discards ‘volatile’ qualifier from pointer target type [-Wdiscarded-qualifiers]
     argc = rb_scan_args(argc, argv, "21:", snamev_p, dnamev_p, &flags_v, &opt);
                                            ^
./include/ruby/ruby.h:2156:56: note: in definition of macro ‘rb_scan_args’
         rb_scan_args0(argc,argv,fmt,(sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)),(VALUE*[]){__VA_ARGS__}), \
                                                        ^
transcode.c:3007:54: warning: initialization discards ‘volatile’ qualifier from pointer target type [-Wdiscarded-qualifiers]
     argc = rb_scan_args(argc, argv, "21:", snamev_p, dnamev_p, &flags_v, &opt);
                                                      ^
./include/ruby/ruby.h:2156:56: note: in definition of macro ‘rb_scan_args’
         rb_scan_args0(argc,argv,fmt,(sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)),(VALUE*[]){__VA_ARGS__}), \
                                                        ^
transcode.c:3007:44: warning: initialization discards ‘volatile’ qualifier from pointer target type [-Wdiscarded-qualifiers]
     argc = rb_scan_args(argc, argv, "21:", snamev_p, dnamev_p, &flags_v, &opt);
                                            ^
./include/ruby/ruby.h:2156:97: note: in definition of macro ‘rb_scan_args’
         rb_scan_args0(argc,argv,fmt,(sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)),(VALUE*[]){__VA_ARGS__}), \
                                                                                                 ^
transcode.c:3007:54: warning: initialization discards ‘volatile’ qualifier from pointer target type [-Wdiscarded-qualifiers]
     argc = rb_scan_args(argc, argv, "21:", snamev_p, dnamev_p, &flags_v, &opt);
                                                      ^
./include/ruby/ruby.h:2156:97: note: in definition of macro ‘rb_scan_args’
         rb_scan_args0(argc,argv,fmt,(sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)),(VALUE*[]){__VA_ARGS__}), \
                                                                                                 ^
transcode.c: At top level:
cc1: warning: unrecognized command line option ‘-Wno-self-assign’
cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
cc1: warning: unrecognized command line option ‘-Wno-tautological-compare’
compiling util.c
```



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