ignore maybe-uninitialized in LinkFutureTest needed by gcc 11.1.0

emper/Debug.hpp

@@ -57,6 +57,15 @@
 #define IGNORE_UNUSED_FUNCTION \
 	_Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wunused-function\"")
 
+// test for GCC > 11.1.0
+#if __GNUC__ > 11 || \
+		(__GNUC__ == 11 && (__GNUC_MINOR__ > 1 || (__GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ > 0)))
+#define IGNORE_MAYBE_UNINITIALIZED \
+	_Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
+#else
+#define IGNORE_MAYBE_UNINITIALIZED _Pragma("GCC diagnostic push")
+#endif
+
 #define POP_DIAGNOSTIC _Pragma("GCC diagnostic pop")
 
 enum class LogSubsystem {

tests/io/LinkFutureTest.cpp

@@ -10,6 +10,7 @@
 #include <cstdint>	// for uint64_t, int32_t
 
 #include "Common.hpp"	 // for DIE_MSG_ERRNO, DIE_MSG
+#include "Debug.hpp"
 #include "io.hpp"
 #include "io/Future.hpp"	// for ReadFuture, CloseFuture, WriteFuture
 
@@ -79,7 +80,12 @@ static void successLoop() {
 
 static void failureChainInvCor() {
 	std::array<char, 32> buf;
+
+	// GCC 11.1.0 reports that buf is not initialized.
+	// Which is totally fine because we read into it.
+	IGNORE_MAYBE_UNINITIALIZED
 	ReadFuture invalidReadFuture(-1, buf.data(), buf.size(), 0);
+	POP_DIAGNOSTIC
 
 	ReadFuture readFuture(0, buf.data(), buf.size(), 0);
 	readFuture.setDependency(invalidReadFuture);