2014/1/6 lh_mouse <lh_mo...@126.com>
> Hi guys, I have noticed that in mingw-gcc, the __FILE__ macro expands
> using the system's code page encoding (e.g. code page 936 on Simplified
> Chinese Windows systems). I will describe how it causes problems:
> When a mbcs literal is used in the source file, GCC does not check
> whether it is legal or not - it simply performs a bytewise copy, just
> opposite to MSVC, which converts UTF8 string literals to code page string
> literals. So the following code will work in both mingw-gcc and MSVC, when
> saved in ANSI text format:
> std::puts("喵"); // "\xDF\xF7" in CP936
> But the following code will NOT work in GCC:
> std::fputws(L"喵", stdout); // L"\xDF\xF7" in CP936
> GCC gives this error:
> error: converting to execution character set: Illegal byte sequence
> I believe this should be due to the encoding. When GCC finds a wide
> string literal, it tries to re-encode the string literal from the file into
> wide string format. In this progress GCC rejects any mbcs encoding but
> UTF8. Converting the source file encoding to UTF8 would solve this problem
> but will cause another one: most stdio functions still expects code page
> strings and will produce gibberish with UTF8 strings.
> The final sollution: avoid narrow string literals in source files, use
> wide string literals only.
> There is still a problem left: some ISO C macros such as __FILE__ still
> use code page encoding - the following code will produce compile errors if
> the file's name contains non-ASCII characters:
> #define TO_WCS2(x) L##x
> #define TO_WCS(x) TO_WCS2(x)
> std::fputws(TO_WCS(__FILE__), stdout);
> Personally I am considering this is a bug because GCC does not actually
> recognizes code page strings.
> What do you think about this?
>
If GCC was properly built with iconv support, you can use the option
-finput-charset to set your file's encoding so that it is properly read by
the compiler. I'm not quite sure how the __FILE__ macro will be affected.
In general, it is always better to write code in plain English, as to avoid
these issues ;-)
See the manual for more information:
http://gcc.gnu.org/onlinedocs/cpp/Invocation.html
Cheers,
Ruben
>
> Best regards,
> 2014-01-06
> lh_mouse
>
>
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