From 6c5b96948e827a0b22435c1bb367414c8a187666 Mon Sep 17 00:00:00 2001
From: Feoramund <161657516+Feoramund@users.noreply.github.com>
Date: Thu, 22 May 2025 20:47:10 -0400
Subject: Enable all sanitizers on FreeBSD

---
 src/linker.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/linker.cpp')

diff --git a/src/linker.cpp b/src/linker.cpp
index 41d4a13a1..447d66d0a 100644
--- a/src/linker.cpp
+++ b/src/linker.cpp
@@ -802,6 +802,18 @@ try_cross_linking:;
 					link_settings = gb_string_appendc(link_settings, "-e _main ");
 				}
 			} else if (build_context.metrics.os == TargetOs_freebsd) {
+				if (build_context.sanitizer_flags & (SanitizerFlag_Address | SanitizerFlag_Memory)) {
+					// It's imperative that `pthread` is linked before `libc`,
+					// otherwise ASan/MSan will be unable to call `pthread_key_create`
+					// because FreeBSD's `libthr` implementation of `pthread`
+					// needs to replace the relevant stubs first.
+					//
+					// (Presumably TSan implements its own `pthread` interface,
+					//  which is why it isn't required.)
+					//
+					// See: https://reviews.llvm.org/D39254
+					platform_lib_str = gb_string_appendc(platform_lib_str, "-lpthread ");
+				}
 				// FreeBSD pkg installs third-party shared libraries in /usr/local/lib.
 				platform_lib_str = gb_string_appendc(platform_lib_str, "-Wl,-L/usr/local/lib ");
 			} else if (build_context.metrics.os == TargetOs_openbsd) {
-- 
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