Fix compilation failures on constexpr matrices with GCC 14

test/constexpr.cpp

@@ -7,6 +7,7 @@
 // Public License v. 2.0. If a copy of the MPL was not distributed
 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#define EIGEN_TESTING_CONSTEXPR
 #include "main.h"
 
 EIGEN_DECLARE_TEST(constexpr) {

test/main.h

@@ -336,7 +336,9 @@ static std::vector<std::string> eigen_assert_list;
 
 #endif  // EIGEN_NO_ASSERTION_CHECKING
 
+#ifndef EIGEN_TESTING_CONSTEXPR
 #define EIGEN_INTERNAL_DEBUGGING
+#endif
 #include <Eigen/QR>  // required for createRandomPIMatrixOfRank and generateRandomMatrixSvs
 
 inline void verify_impl(bool condition, const char* testname, const char* file, int line,