regression after usingnamespace changes

[semarie]

I am not able to building to OpenBSD i386 anymore. I am suspecting that FreeBSD is also impacted for all archs except x86_64.

$ ZIG_LIBC=path/to/i386/libc.conf zig build-exe -target i386-openbsd hello.zig
/home/semarie/repos/ziglang/zig/lib/std/c/openbsd.zig:869:33: error: container 'std.c.openbsd.arch_bits' has no member called 'ucontext_t'
pub const ucontext_t = arch_bits.ucontext_t;
                                ^
/home/semarie/repos/ziglang/zig/lib/std/os.zig:162:30: note: referenced here
pub const ucontext_t = system.ucontext_t;
                             ^
/home/semarie/repos/ziglang/zig/lib/std/debug.zig:1554:43: note: referenced here
            const ctx = @ptrCast(*const os.ucontext_t, @alignCast(@alignOf(os.ucontext_t), ctx_ptr));
                                          ^

i386 architecture doesn't have ucontext_t definition in std/c/openbsd.zig. Previously, it wasn't a problem as the segfault handler is installed only if the struct was defined.

pub const have_segfault_handling_support = switch (native_os) {
    .linux, .netbsd => true,
    .windows => true,
    .freebsd, .openbsd => @hasDecl(os.system, "ucontext_t"),
    else => false,
};

Currently, it seems that @hasDecl(os.system, "ucontext_t") is true even if ucontext_t doesn't exist in std.c.openbsd.arch_bits. It might be because of os.zig is defining pub const ucontext_t = system.ucontext_t (so it lazily exists).

I could provide a script to create libc.conf environment for i386-openbsd if it helps to reproduce the problem.

[andrewrk]

Thanks for the report!