pthread_attr_union uses wrong types on wasi preview1 with threads

[programmerjake]

rust/library/std/src/sys/wasi/thread.rs

Lines 19 to 26 in 5697f16

	// defined in wasi-libc
	// https://github.com/WebAssembly/wasi-libc/blob/a6f871343313220b76009827ed0153586361c0d5/libc-top-half/musl/include/alltypes.h.in#L108
	#[repr(C)]
	union pthread_attr_union {
	__i: [ffi::c_int; if mem::size_of::<ffi::c_int>() == 8 { 14 } else { 9 }],
	__vi: [ffi::c_int; if mem::size_of::<ffi::c_int>() == 8 { 14 } else { 9 }],
	__s: [ffi::c_ulong; if mem::size_of::<ffi::c_int>() == 8 { 7 } else { 9 }],
	}

the type which should have its size compared is c_long, not c_int:

wasi-libc's code linked in comment above:

TYPEDEF struct { union { int __i[sizeof(long)==8?14:9]; volatile int __vi[sizeof(long)==8?14:9]; unsigned long __s[sizeof(long)==8?7:9]; } __u; } pthread_attr_t;

since you made the commit, cc @g0djan

[g0djan]

Hey you're right, I opened a PR with a fix