Use __asan_default_options instead of ASAN_OPTIONS

src/version.cpp

@@ -6,6 +6,21 @@
 
 #include "helpers.hpp"
 
+// We do not build `make develop` with `-fsanitize=leak` because macOS clang++ does not support it.
+// Instead, we enable ASan (`-fsanitize=address`) to check for memory leaks in all four programs.
+#ifdef __clang__
+	#if __has_feature(address_sanitizer) && !defined(__SANITIZE_ADDRESS__)
+		#define __SANITIZE_ADDRESS__
+	#endif
+#endif
+#ifdef __SANITIZE_ADDRESS__
+extern "C" {
+char const *__asan_default_options(void) {
+	return "detect_leaks=1";
+}
+}
+#endif
+
 // This variable is passed via `-D` from the Makefile, but not from CMake
 // (in which `configure_file()` is used on this file to replace some syntax)
 #ifndef BUILD_VERSION_STRING

test/run-tests.sh

@@ -41,12 +41,6 @@ if [[ ! ( -x ../rgbasm && -x ../rgblink && -x ../rgbfix && -x ../rgbgfx ) ]]; th
 	false
 fi
 
-# We do not compile with `-fsanitize=leak` because macOS clang++ does not support it.
-# Instead, enable ASan (`-fsanitize=address`) to check for memory leaks.
-if [ "$(uname)" != "Darwin" ]; then
-	export ASAN_OPTIONS=detect_leaks=1
-fi
-
 # Tests included with the repository
 
 for dir in asm link fix gfx; do