Detect: Add __STDCPP_DEFAULT_NEW_ALIGNMENT__ predefined VS macro

This macro is missing from the main MSVC predefined macro list but is
documented by [1] and [2].  Also add `__STDCPP_STRICT_POINTER_SAFETY__`
as documented by [2] in case MSVC ever starts defining it.

[1] https://docs.microsoft.com/en-us/cpp/build/reference/zc-alignednew
[2] https://en.cppreference.com/w/cpp/preprocessor/replace

Fixes: CastXML#125

Author: bradking

Diff for: share/castxml/detect_vs.cpp

@@ -176,6 +176,12 @@
 #ifdef __MSVC_RUNTIME_CHECKS
 # pragma message(TO_DEFINE(__MSVC_RUNTIME_CHECKS))
 #endif
+#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
+# pragma message(TO_DEFINE(__STDCPP_DEFAULT_NEW_ALIGNMENT__))
+#endif
+#ifdef __STDCPP_STRICT_POINTER_SAFETY__
+# pragma message(TO_DEFINE(__STDCPP_STRICT_POINTER_SAFETY__))
+#endif
 #ifdef __STDCPP_THREADS__
 # pragma message(TO_DEFINE(__STDCPP_THREADS__))
 #endif

Diff for: test/CMakeLists.txt

@@ -394,6 +394,7 @@ castxml_test_cmd(cc-msvc-std-c++98 --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc>
 castxml_test_cmd(cc-msvc-std-c++11 --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1600 ")" ${empty_cxx} "-###")
 castxml_test_cmd(cc-msvc-std-c++14 --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1900 ")" ${empty_cxx} "-###")
 castxml_test_cmd(cc-msvc-std-c++17 --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1900 -msvc_lang=201703L ")" ${empty_cxx} "-###")
+castxml_test_cmd(cc-msvc-std-c++17-E --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1900 -msvc_lang=201703L -stdcpp_default_new_alignment=16ll ")" ${empty_cxx} -E -dM)
 castxml_test_cmd(cc-msvc-std-explicit --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1500 ")" -std=gnu++14 ${empty_cxx} "-###")
 castxml_test_cmd(cc-msvc-builtin-1800-E --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1800 ")" ${empty_cxx} -E -dM)
 castxml_test_cmd(cc-msvc-builtin-1900-E --castxml-cc-msvc "(" $<TARGET_FILE:cc-msvc> -msc=1900 ")" ${empty_cxx} -E -dM)

Diff for: test/cc-msvc.c

@@ -6,14 +6,17 @@ int main(int argc, const char* argv[])
   int cpp = 0;
   const char* msc_ver = "1600";
   const char* msvc_lang = 0;
+  const char* stdcpp_default_new_alignment = 0;
   int i;
   for (i = 1; i < argc; ++i) {
     if (strncmp(argv[i], "--cc-define=", 12) == 0) {
       fprintf(stdout, "\n#define %s 1", argv[i]+12);
     } else if (strncmp(argv[i], "-msc=", 5) == 0) {
       msc_ver = argv[i]+5;
-    } else if (strncmp(argv[i], "-msvc_lang=", 8) == 0) {
+    } else if (strncmp(argv[i], "-msvc_lang=", 11) == 0) {
       msvc_lang = argv[i]+11;
+    } else if (strncmp(argv[i], "-stdcpp_default_new_alignment=", 30) == 0) {
+      stdcpp_default_new_alignment = argv[i]+30;
     } else if (strstr(argv[i], ".cpp")) {
       cpp = 1;
     }
@@ -34,6 +37,11 @@ int main(int argc, const char* argv[])
       "#define _MSVC_LANG %s\n", msvc_lang
       );
   }
+  if(stdcpp_default_new_alignment) {
+    fprintf(stdout,
+      "#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ %s\n",
+      stdcpp_default_new_alignment);
+  }
   fprintf(stdout,
     "#define __has_include(x) x\n"
     "#define __has_include_next(x) x\n"

Diff for: test/expect/cmd.cc-msvc-std-c++17-E.stdout.txt

@@ -0,0 +1,11 @@
+^#define _MSC_VER 1900
+#define _MSVC_LANG 201703L
+#define _WIN32 1
+#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16ll
+#define __castxml__ [0-9]+
+#define __castxml_clang_major__ [0-9]+
+#define __castxml_clang_minor__ [0-9]+
+#define __castxml_clang_patchlevel__ [0-9]+
+#define __cplusplus 199711L
+#define __is_assignable\(_To,_Fr\) \(sizeof\(__castxml__is_assignable_check<_To,_Fr>\(0\)\) == sizeof\(char\(&\)\[1\]\)\)(
+#define __make_integer_seq __castxml__make_integer_seq)?$