From 710e2e7f1048cb7d5a7c8d2bdd954f108dd94e7a Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 26 Oct 2022 12:56:29 -0700
Subject: libcxx: only pass -DHAVE___CXA_THREAD_ATEXIT_IMPL for glibc

This definition communicates to libcxxabi that the libc will provide the
`__cxa_thread_atexit_impl` symbol. This is true for glibc but not
true for other libcs, such as musl.
---
 src/libcxx.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/libcxx.zig b/src/libcxx.zig
index b0261aaed6..850da698c5 100644
--- a/src/libcxx.zig
+++ b/src/libcxx.zig
@@ -320,7 +320,7 @@ pub fn buildLibCXXABI(comp: *Compilation) !void {
             }
             try cflags.append("-D_LIBCXXABI_HAS_NO_THREADS");
             try cflags.append("-D_LIBCPP_HAS_NO_THREADS");
-        } else {
+        } else if (target.abi.isGnu()) {
             try cflags.append("-DHAVE___CXA_THREAD_ATEXIT_IMPL");
         }
 
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