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Date: Mon, 29 Dec 2014 11:27:20 -0500
From: Richard Gorton <rcgorton@...nitive-electronics.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: the case for __MUSL__
Hi,
I'm working on getting C++ working for our target: we use clang, and libcxx/libcxxabi libraries from llvm.org
it seems to me (as I'm doing this) that instead of doing things like
// Our compiler defines __COGNITIVE__
#if defined(__COGNITIVE__)
It would make more sense to use
#if defined(__MUSL__)
I'm not proposing/suggesting use of this within musl itself, but for use in other libraries (such as libcxx) which 'know' about the internal implementation of libc.
Thoughts & Comments appreciated
An example case is in libcxx/src/locale.cpp, where there are bits of code related to accessing the current locale:
const ctype<char>::mask*
ctype<char>::classic_table() _NOEXCEPT
{
#if defined(__APPLE__) || defined(__FreeBSD__)
return _DefaultRuneLocale.__runetype;
#elif defined(__NetBSD__)
return _C_ctype_tab_ + 1;
#elif defined(__GLIBC__)
return __cloc()->__ctype_b;
#elif __sun__
return __ctype_mask;
#elif defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
return _ctype+1; // internal ctype mask table defined in msvcrt.dll
// This is assumed to be safe, which is a nonsense assumption because we're
// going to end up dereferencing it later...
#elif defined(__EMSCRIPTEN__) || defined(__COGNITIVE__)
return *__ctype_b_loc();
#elif defined(_AIX)
return (const unsigned int *)__lc_ctype_ptr->obj->mask;
#elif defined(__ANDROID__)
return _ctype_;
#else
// Platform not supported: abort so the person doing the port knows what to
// fix
# warning ctype<char>::classic_table() is not implemented
printf("ctype<char>::classic_table() is not implemented\n");
abort();
return NULL;
#endif
}
Regards,
Richard
rcgorton@...-e.com
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