Investigate the feasibility of using LLVM's libc++

[patrick-lafferty]

Investigate the feasibility of using LLVM's libc++

[patrick-lafferty]

libc++ depends on the following missing libc definitions:

• wchar.h
• assert.h
• mbstate_t
• strncat, strcoll, strxfrm, strchr, strcspn, strpbrk, strspn, strtok, strerror
• div_t, ldiv_t, lldiv_t
• div, ldiv, lldiv
• atof, atoi, atol, atoll
• strtod, strtof, strtold, strtoll, strtoul, strtoull
• rand, srand
• calloc
• abort
• atexit, exit, _Exit
• getenv, system
• bsearch
• abs, labs, llabs
• mblen, mbtowc, wctomb, mbstowcs, wcstombs
• setbuf, setvbuf
• snprintf, vfprintf, vsnprintf, vsprintf, vprintf
• sscanf, vfscanf, vsscanf, scanf, vscanf
• ungetc, getchar, putchar, puts
• rewind, clearerr, feof, ferror, perror
• freopen, remove, rename, tmpfile, tmpnam
• wint_t
• wmemmove, wmemcpy, wmemset, WEOF
• fwprintf, fwscanf, swprintf, vfwprintf, vswprintf
• swscanf, vfwscanf, vswscanf
• fgetwc, fgetws, fputwc, fputws, fwide
• getwc, putwc, ungetwc
• wcstod, wcstof, wcstold, wcstol, wcstoll, wcstoul, wcstoull
• wcscpy, wcsncpy, wcscat, wcsncat, wcscmp, wcscoll
• wcsncmp, wcsxfrm, wcscspn, wcslen, wcsspn, wcstok, wmemcmp, wcsftime
• btowc

[patrick-lafferty]

Additionally, libcxxabi depends on:

• wcschr, wcspbrk, wsrchr, wcsstr, wmemchr
• tolower, toupper, assert
• time.h
• tm, clock, difftime, mktime, time
• asctime, ctime, gmtime, localtime, strftime
• errno.h

[patrick-lafferty]

Update: libcxx/libcxxabi can be successfully built with Saturn's libc (though all of the above declarations remain undefined), currently testing.

[patrick-lafferty]

Good to go!