Add illumos OS tag

- Adds `illumos` to the `Target.Os.Tag` enum. A new function,
  `isSolarish` has been added that returns true if the tag is either
  Solaris or Illumos. This matches the naming convention found in Rust's
  `libc` crate[1].
- Add the tag wherever `.solaris` is being checked against.
- Check for the C pre-processor macro `__illumos__` in CMake to set the
  proper target tuple. Illumos distros patch their compilers to have
  this in the "built-in" set (verified with `echo | cc -dM -E -`).

  Alternatively you could check the output of `uname -o`.

Right now, both Solaris and Illumos import from `c/solaris.zig`. In the
future it may be worth putting the shared ABI bits in a base file, and
mixing that in with specific `c/solaris.zig`/`c/illumos.zig` files.

[1]: https://github.com/rust-lang/libc/tree/6e02a329a2a27f6887ea86952f389ca11e06448c/src/unix/solarish

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/std/process.zig b/lib/std/process.zig
index fe5a44d3ad..a7f9d8d9d8 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -959,7 +959,18 @@ pub const UserInfo = struct {
 /// POSIX function which gets a uid from username.
 pub fn getUserInfo(name: []const u8) !UserInfo {
     return switch (builtin.os.tag) {
-        .linux, .macos, .watchos, .tvos, .ios, .freebsd, .netbsd, .openbsd, .haiku, .solaris => posixGetUserInfo(name),
+        .linux,
+        .macos,
+        .watchos,
+        .tvos,
+        .ios,
+        .freebsd,
+        .netbsd,
+        .openbsd,
+        .haiku,
+        .solaris,
+        .illumos,
+        => posixGetUserInfo(name),
         else => @compileError("Unsupported OS"),
     };
 }