This change greatly reduces the number of modules that need to be
compiled. The only issue right now is that sometimes when viewing
symbol table entries, the aliased symbol is chosen.
It's now possible to run commands like:
make -j8 m=aarch64 o/aarch64/test/libc/str
Which will cross-compile and run the test suites in a qemu-aarch64
binary that's vendored in the third_party/qemu/ folder within your
x86_64 build environment.
The C standard states:
> Unless explicitly stated otherwise, the functions described in this
> subclause order two wide characters the same way as two integers of
> the underlying integer type designated by wchar_t.
>
> [...]
>
> The wcscmp function returns an integer greater than, equal to, or
> less than zero, accordingly as the wide string pointed to by s1 is
> greater than, equal to, or less than the wide string pointed to by
> s2.
>
> [...]
>
> The wcsncmp function returns an integer greater than, equal to, or
> less than zero, accordingly as the possibly null-terminated array
> pointed to by s1 is greater than, equal to, or less than the
> possibly null-terminated array pointed to by s2.
- C Standard, 7.31.4.4. Wide string comparison functions
Cosmopolitan fails to obey this in cases where the difference between
two wide characters is larger than WCHAR_MAX.
This means that, for example, the following program:
#include <stdio.h>
#include <wchar.h>
#include <limits.h>
int main()
{
wchar_t str1[] = { WCHAR_MIN, L'\0' };
wchar_t str2[] = { WCHAR_MAX, L'\0' };
printf("%d\n", wcscmp(str1, str2));
printf("%d\n", wcsncmp(str1, str2, 2));
}
will print `1` twice, instead of the negative numbers mandated by the
standard (as WCHAR_MIN is less than WCHAR_MAX)
This patch fixes this, along with the associated Github issue,
https://github.com/jart/cosmopolitan/issues/783
