If we detect that the compiler supports FASTFLOAT_IS_CONSTEXPR, then let us run the tests automatically.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 2dc784e..37f6c7f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -60,7 +60,7 @@
fast_float_add_cpp_test(example_test)
fast_float_add_cpp_test(example_comma_test)
fast_float_add_cpp_test(basictest)
-option(FASTFLOAT_CONSTEXPR_TESTS "Constexpr tests" OFF)
+option(FASTFLOAT_CONSTEXPR_TESTS "Require constexpr tests (build will fail if the compiler won't support it)" OFF)
if (FASTFLOAT_CONSTEXPR_TESTS)
target_compile_features(basictest PRIVATE cxx_std_20)
target_compile_definitions(basictest PRIVATE FASTFLOAT_CONSTEXPR_TESTS)
diff --git a/tests/basictest.cpp b/tests/basictest.cpp
index 5615b5d..3ed10f0 100644
--- a/tests/basictest.cpp
+++ b/tests/basictest.cpp
@@ -13,6 +13,12 @@
#include <type_traits>
#include <cfenv>
+#if FASTFLOAT_IS_CONSTEXPR
+#ifndef FASTFLOAT_CONSTEXPR_TESTS
+#define FASTFLOAT_CONSTEXPR_TESTS 1
+#endif // #ifndef FASTFLOAT_CONSTEXPR_TESTS
+#endif // FASTFLOAT_IS_CONSTEXPR
+
#if FASTFLOAT_HAS_BIT_CAST
#include <bit>
#endif
@@ -74,6 +80,10 @@
TEST_CASE("system_info") {
std::cout << "system info:" << std::endl;
+#ifdef FASTFLOAT_CONSTEXPR_TESTS
+ SHOW_DEFINE(FASTFLOAT_CONSTEXPR_TESTS);
+
+#endif
#ifdef _MSC_VER
SHOW_DEFINE(_MSC_VER);
#endif
