Catch2 does not compile on Solaris.

[jealas]

Current master does not compile on Solaris due to a name conflict with a #define in the <sys/regset.h> header.

I was able to reproduce this bug in an isolated directory containing a main.cpp (below) and the single_include/catch2/catch.hpp header from commit e2d863b. This is the simple main.cpp file that doesn't compile:

#include "catch.hpp"
int main() {}

Compilation command: g++ -std=c++11 -I. main.cpp

This bug originated in commit 004228e where the template parameter name "SS" was used. The conflicting define in the Solaris <sys/regset.h> header is this:

#define SS              18      /* only stored on a privilege transition */

Naturally, g++ errors out when it encounters a numeric constant instead of a template parameter name:

catch.hpp:1542:31: error: expected nested-name-specifier before **numeric constant**
template<typename SS, typename TT>
                   ^

Platform Info:
OS: Solaris 11.4.0.15.0 i386
Compiler: GCC 7.3.0
Catch Version: e2d863b

A PR will be created to fix this issue.