According to MSVC manual (*1), cl.exe can skip including a header file
when that:
- contains #pragma once, or
- starts with #ifndef, or
- starts with #if ! defined.
GCC has a similar trick (*2), but it acts more stricter (e. g. there
must be _no tokens_ outside of #ifndef...#endif).
Sun C lacked #pragma once for a looong time. Oracle Developer Studio
12.5 finally implemented it, but we cannot assume such recent version.
This changeset modifies header files so that each of them include
strictly one #ifndef...#endif. I believe this is the most portable way
to trigger compiler optimizations. [Bug #16770]
*1: https://docs.microsoft.com/en-us/cpp/preprocessor/once
*2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
(rb_enc_nth): don't check the return value of rb_enc_mbclen.
(rb_enc_strlen): ditto.
(rb_enc_precise_mbclen): return needmore(1) if e <= p.
(rb_enc_get_ascii): new function for extracting ASCII character.
* include/ruby/encoding.h (rb_enc_get_ascii): declared.
* include/ruby/regex.h (ismbchar): removed.
* re.c (rb_reg_expr_str): use rb_enc_get_ascii.
(unescape_escaped_nonascii): use rb_enc_precise_mbclen to determine
the termination of escaped non-ASCII character.
(unescape_nonascii): use rb_enc_precise_mbclen.
(rb_reg_quote): use rb_enc_get_ascii.
(rb_reg_regsub): use rb_enc_get_ascii.
* string.c (rb_str_reverse) don't check the return value of
rb_enc_mbclen.
(rb_str_split_m): don't call rb_enc_mbclen with e <= p.
* parse.y (is_identchar): use ISASCII.
(parser_ismbchar): removed.
(parser_precise_mbclen): new macro.
(parser_isascii): new macro.
(parser_tokadd_mbchar): use parser_precise_mbclen to check invalid
character precisely.
(parser_tokadd_string): use parser_isascii.
(parser_yylex): ditto.
(is_special_global_name): don't call is_identchar with e <= p.
(rb_enc_symname_p): ditto.
[ruby-dev:32455]
* ext/tk/sample/tkextlib/vu/canvSticker2.rb: remove coding cookie
because the encoding is not UTF-8. [ruby-dev:32475]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14131 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
