Tests/CompileFeatures: Factor out headers to compute C and C++ standard levels

Tests/CompileFeatures/c_std.h

@@ -0,0 +1,8 @@
+#define C_STD_99 199901L
+#define C_STD_11 201112L
+#define C_STD_17 201710L
+#define C_STD_23 202311L
+
+#ifdef __STDC_VERSION__
+#  define C_STD __STDC_VERSION__
+#endif

Tests/CompileFeatures/cxx_std.h

@@ -0,0 +1,50 @@
+#define CXX_STD_98 199711L
+#define CXX_STD_11 201103L
+#define CXX_STD_14 201402L
+#define CXX_STD_17 201703L
+#define CXX_STD_20 202002L
+#define CXX_STD_23 202302L
+
+#if defined(__INTEL_COMPILER) && defined(_MSVC_LANG)
+#  if _MSVC_LANG > CXX_STD_17
+#    define CXX_STD _MSVC_LANG
+#  elif _MSVC_LANG == CXX_STD_17 && defined(__cpp_aggregate_paren_init)
+#    define CXX_STD CXX_STD_20
+#  elif _MSVC_LANG > CXX_STD_14 && __cplusplus > CXX_STD_17
+#    define CXX_STD CXX_STD_20
+#  elif _MSVC_LANG > CXX_STD_14
+#    define CXX_STD CXX_STD_17
+#  elif defined(__INTEL_CXX11_MODE__) && defined(__cpp_aggregate_nsdmi)
+#    define CXX_STD CXX_STD_14
+#  elif defined(__INTEL_CXX11_MODE__)
+#    define CXX_STD CXX_STD_11
+#  else
+#    define CXX_STD CXX_STD_98
+#  endif
+#elif defined(_MSC_VER) && defined(_MSVC_LANG)
+#  define CXX_STD _MSVC_LANG
+#elif defined(__NVCOMPILER)
+#  if __cplusplus == CXX_STD_17 && defined(__cpp_aggregate_paren_init)
+#    define CXX_STD CXX_STD_20
+#  else
+#    define CXX_STD __cplusplus
+#  endif
+#elif defined(__INTEL_COMPILER) || defined(__PGI)
+#  if __cplusplus == CXX_STD_11 && defined(__cpp_namespace_attributes)
+#    define CXX_STD CXX_STD_17
+#  elif __cplusplus == CXX_STD_11 && defined(__cpp_aggregate_nsdmi)
+#    define CXX_STD CXX_STD_14
+#  else
+#    define CXX_STD __cplusplus
+#  endif
+#elif (defined(__IBMCPP__) || defined(__ibmxl__)) && defined(__linux__)
+#  if __cplusplus == CXX_STD_11 && defined(__cpp_aggregate_nsdmi)
+#    define CXX_STD CXX_STD_14
+#  else
+#    define CXX_STD __cplusplus
+#  endif
+#elif __cplusplus == 1 && defined(__GXX_EXPERIMENTAL_CXX0X__)
+#  define CXX_STD CXX_STD_11
+#else
+#  define CXX_STD __cplusplus
+#endif

Tests/CompileFeatures/default_dialect.c

@@ -1,11 +1,4 @@
-#define C_STD_99 199901L
-#define C_STD_11 201112L
-#define C_STD_17 201710L
-#define C_STD_23 202311L
-
-#ifdef __STDC_VERSION__
-#  define C_STD __STDC_VERSION__
-#endif
+#include "c_std.h"
 
 #if DEFAULT_C23
 #  if C_STD <= C_STD_17

Tests/CompileFeatures/default_dialect.cpp

@@ -1,58 +1,8 @@
+#include "cxx_std.h"
 
 template <long l>
 struct Outputter;
 
-#define CXX_STD_98 199711L
-#define CXX_STD_11 201103L
-#define CXX_STD_14 201402L
-#define CXX_STD_17 201703L
-#define CXX_STD_20 202002L
-#define CXX_STD_23 202302L
-
-#if defined(__INTEL_COMPILER) && defined(_MSVC_LANG)
-#  if _MSVC_LANG > CXX_STD_17
-#    define CXX_STD _MSVC_LANG
-#  elif _MSVC_LANG == CXX_STD_17 && defined(__cpp_aggregate_paren_init)
-#    define CXX_STD CXX_STD_20
-#  elif _MSVC_LANG > CXX_STD_14 && __cplusplus > CXX_STD_17
-#    define CXX_STD CXX_STD_20
-#  elif _MSVC_LANG > CXX_STD_14
-#    define CXX_STD CXX_STD_17
-#  elif defined(__INTEL_CXX11_MODE__) && defined(__cpp_aggregate_nsdmi)
-#    define CXX_STD CXX_STD_14
-#  elif defined(__INTEL_CXX11_MODE__)
-#    define CXX_STD CXX_STD_11
-#  else
-#    define CXX_STD CXX_STD_98
-#  endif
-#elif defined(_MSC_VER) && defined(_MSVC_LANG)
-#  define CXX_STD _MSVC_LANG
-#elif defined(__NVCOMPILER)
-#  if __cplusplus == CXX_STD_17 && defined(__cpp_aggregate_paren_init)
-#    define CXX_STD CXX_STD_20
-#  else
-#    define CXX_STD __cplusplus
-#  endif
-#elif defined(__INTEL_COMPILER) || defined(__PGI)
-#  if __cplusplus == CXX_STD_11 && defined(__cpp_namespace_attributes)
-#    define CXX_STD CXX_STD_17
-#  elif __cplusplus == CXX_STD_11 && defined(__cpp_aggregate_nsdmi)
-#    define CXX_STD CXX_STD_14
-#  else
-#    define CXX_STD __cplusplus
-#  endif
-#elif (defined(__IBMCPP__) || defined(__ibmxl__)) && defined(__linux__)
-#  if __cplusplus == CXX_STD_11 && defined(__cpp_aggregate_nsdmi)
-#    define CXX_STD CXX_STD_14
-#  else
-#    define CXX_STD __cplusplus
-#  endif
-#elif __cplusplus == 1 && defined(__GXX_EXPERIMENTAL_CXX0X__)
-#  define CXX_STD CXX_STD_11
-#else
-#  define CXX_STD __cplusplus
-#endif
-
 #if DEFAULT_CXX23
 #  if CXX_STD <= CXX_STD_20
 Outputter<CXX_STD> o;