From 67c9d57e2735d4ad9846127d2fa140e61b945ee4 Mon Sep 17 00:00:00 2001
From: Alex Rønne Petersen <alex@alexrp.com>
Date: Sun, 26 Oct 2025 09:50:55 +0100
Subject: Compilation: define __illumos__ for C/C++ when targeting illumos

Per the illumos GCC fork.
---
 src/Compilation.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/Compilation.zig')

diff --git a/src/Compilation.zig b/src/Compilation.zig
index 5925a80f08..760c8f8b11 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -6864,8 +6864,11 @@ fn addCommonCCArgs(
                 },
             }
 
-            // Homebrew targets without LLVM support; use communities's preferred macros.
             switch (target.os.tag) {
+                // LLVM doesn't distinguish between Solaris and illumos, but the illumos GCC fork
+                // defines this macro.
+                .illumos => try argv.append("__illumos__"),
+                // Homebrew targets without LLVM support; use communities's preferred macros.
                 .@"3ds" => try argv.append("-D__3DS__"),
                 .vita => try argv.append("-D__vita__"),
                 else => {},
-- 
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