ruby 2.0.0 p0 compile warning.

gistfile1.txt

compiling thread.c
thread.c:3291:34: warning: variable 'orig_read' is uninitialized when used within its own initialization [-Wuninitialized]
    rb_fdset_t UNINITIALIZED_VAR(orig_read);
                                 ^~~~~~~~~
./vm_core.h:119:34: note: expanded from macro 'UNINITIALIZED_VAR'
#define UNINITIALIZED_VAR(x) x = x
                                 ^
thread.c:3292:34: warning: variable 'orig_write' is uninitialized when used within its own initialization [-Wuninitialized]
    rb_fdset_t UNINITIALIZED_VAR(orig_write);
                                 ^~~~~~~~~~
./vm_core.h:119:34: note: expanded from macro 'UNINITIALIZED_VAR'
#define UNINITIALIZED_VAR(x) x = x
                                 ^
thread.c:3293:34: warning: variable 'orig_except' is uninitialized when used within its own initialization [-Wuninitialized]
    rb_fdset_t UNINITIALIZED_VAR(orig_except);
                                 ^~~~~~~~~~~
./vm_core.h:119:34: note: expanded from macro 'UNINITIALIZED_VAR'
#define UNINITIALIZED_VAR(x) x = x
                                 ^
3 warnings generated.

-- snip --

compiling ../.././ext/psych/yaml/api.c
../.././ext/psych/yaml/api.c:842:18: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        length = strlen((char *)value);
               ~ ^~~~~~~~~~~~~~~~~~~~~
../.././ext/psych/yaml/api.c:1218:18: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        length = strlen((char *)value);
               ~ ^~~~~~~~~~~~~~~~~~~~~
../.././ext/psych/yaml/api.c:1230:32: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    return document->nodes.top - document->nodes.start;
    ~~~~~~ ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
../.././ext/psych/yaml/api.c:1275:32: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    return document->nodes.top - document->nodes.start;
    ~~~~~~ ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
../.././ext/psych/yaml/api.c:1320:32: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    return document->nodes.top - document->nodes.start;
    ~~~~~~ ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
5 warnings generated.
compiling ../.././ext/psych/yaml/dumper.c
compiling ../.././ext/psych/yaml/emitter.c
compiling ../.././ext/psych/yaml/loader.c
../.././ext/psych/yaml/loader.c:301:41: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    index = parser->document->nodes.top - parser->document->nodes.start;
          ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../.././ext/psych/yaml/loader.c:346:41: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    index = parser->document->nodes.top - parser->document->nodes.start;
          ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../.././ext/psych/yaml/loader.c:404:41: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    index = parser->document->nodes.top - parser->document->nodes.start;
          ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 warnings generated.
compiling ../.././ext/psych/yaml/parser.c
compiling ../.././ext/psych/yaml/reader.c
compiling ../.././ext/psych/yaml/scanner.c
../.././ext/psych/yaml/scanner.c:884:57: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
    if (!yaml_parser_unroll_indent(parser, parser->mark.column))
         ~~~~~~~~~~~~~~~~~~~~~~~~~         ~~~~~~~~~~~~~^~~~~~
../.././ext/psych/yaml/scanner.c:1586:59: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
             ~~~~~~~~~~~~~~~~~~~~~~~         ~~~~~~~~~~~~~^~~~~~
../.././ext/psych/yaml/scanner.c:1647:59: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
             ~~~~~~~~~~~~~~~~~~~~~~~         ~~~~~~~~~~~~~^~~~~~
../.././ext/psych/yaml/scanner.c:1703:63: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        if (!yaml_parser_roll_indent(parser, simple_key->mark.column,
             ~~~~~~~~~~~~~~~~~~~~~~~         ~~~~~~~~~~~~~~~~~^~~~~~
../.././ext/psych/yaml/scanner.c:1704:33: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
                    simple_key->token_number,
                    ~~~~~~~~~~~~^~~~~~~~~~~~
../.././ext/psych/yaml/scanner.c:1733:63: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
            if (!yaml_parser_roll_indent(parser, parser->mark.column, -1,
                 ~~~~~~~~~~~~~~~~~~~~~~~         ~~~~~~~~~~~~~^~~~~~
6 warnings generated.

clang --version
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.1
Thread model: posix