Added [!nonportable] tag

docs/test-cases-and-sections.md

@@ -42,6 +42,8 @@ All tag names beginning with non-alphanumeric characters are reserved by Catch.
 
 * `[!mayfail]` - doesn't fail the test if any given assertion fails (but still reports it). This can be useful to flag a work-in-progress, or a known issue that you don't want to immediately fix but still want to track in the your tests.
 
+* `[!nonportable]` - Indicates that behaviour may vary between platforms or compilers.
+
 * `[#<filename>]` - running with `-#` or `--filenames-as-tags` causes Catch to add the filename, prefixed with `#` (and with any extension stripped) as a tag. e.g. tests in testfile.cpp would all be tagged `[#testfile]`.
 
 * `[@<alias>]` - tag aliases all begin with `@` (see below).

include/internal/catch_test_case_info.h

@@ -29,7 +29,8 @@ namespace Catch {
             IsHidden = 1 << 1,
             ShouldFail = 1 << 2,
             MayFail = 1 << 3,
-            Throws = 1 << 4
+            Throws = 1 << 4,
+            NonPortable = 1 << 5
         };
 
         TestCaseInfo(   std::string const& _name,

include/internal/catch_test_case_info.hpp

@@ -26,6 +26,8 @@ namespace Catch {
             return TestCaseInfo::ShouldFail;
         else if( tag == "!mayfail" )
             return TestCaseInfo::MayFail;
+        else if( tag == "!nonportable" )
+            return TestCaseInfo::NonPortable;
         else
             return TestCaseInfo::None;
     }