Merge pull request #23000 from mrc0mmand/coverage__exit

macro: call __gcov_dump() before _exit() w/ coverage enabled

src/basic/macro.h

@@ -29,6 +29,19 @@
 #define _alignptr_ __attribute__((__aligned__(sizeof(void*))))
 #define _warn_unused_result_ __attribute__((__warn_unused_result__))
 
+#if defined(BUILT_WITH_COVERAGE) && BUILT_WITH_COVERAGE
+/* We need to explicitly call __gcov_dump() in places where we use _exit(), since
+ * _exit() skips at-exit hooks resulting in lost coverage */
+#  include <unistd.h>
+extern void __gcov_dump(void);
+
+_noreturn_ static inline void _coverage__exit(int status) {
+        __gcov_dump();
+        _exit(status);
+}
+#  define _exit(x) _coverage__exit(x)
+#endif
+
 #if !defined(HAS_FEATURE_MEMORY_SANITIZER)
 #  if defined(__has_feature)
 #    if __has_feature(memory_sanitizer)