Cygwin compatibility fixes

docs/configuration.md

@@ -75,11 +75,13 @@ All C++11 support can be disabled with `CATCH_CONFIG_NO_CPP11`
     CATCH_CONFIG_COUNTER                    // Use __COUNTER__ to generate unique names for test cases
     CATCH_CONFIG_WINDOWS_SEH                // Enable SEH handling on Windows
     CATCH_CONFIG_FAST_COMPILE               // Sacrifices some (extremely minor) features for compilation speed
+    CATCH_CONFIG_POSIX_SIGNALS              // Enable handling POSIX signals
 
-Currently Catch enables `CATCH_CONFIG_WINDOWS_SEH` only when compiled with MSVC, because some versions of MinGW do not have the necessary Win32 API supports.
+Currently Catch enables `CATCH_CONFIG_WINDOWS_SEH` only when compiled with MSVC, because some versions of MinGW do not have the necessary Win32 API support.
 
 At this moment, `CATCH_CONFIG_FAST_COMPILE` changes only the behaviour of the `-b` (`--break`) flag, making it break into debugger in a stack frame *below* the actual test, unlike the default behaviour, where the break into debugger occurs in the same stack frame as the actual test. `CATCH_CONFIG_FAST_COMPILE` has to be either defined, or not defined, in all translation units that are linked into single test binary, or the behaviour of setting `-b` flag will be unpredictable.
 
+`CATCH_CONFIG_POSIX_SIGNALS` is on by default, except when Catch is compiled under `Cygwin`, where it is disabled by default (but can be force-enabled by defining `CATCH_CONFIG_POSIX_SIGNALS`).
 
 Just as with the C++11 conformance toggles, these toggles can be disabled by using `_NO_` form of the toggle, e.g. `CATCH_CONFIG_NO_WINDOWS_SEH`.
 

include/internal/catch_compiler_capabilities.h

@@ -27,6 +27,7 @@
 // CATCH_CONFIG_VARIADIC_MACROS : are variadic macros supported?
 // CATCH_CONFIG_COUNTER : is the __COUNTER__ macro supported?
 // CATCH_CONFIG_WINDOWS_SEH : is Windows SEH supported?
+// CATCH_CONFIG_POSIX_SIGNALS : are POSIX signals supported?
 // ****************
 // Note to maintainers: if new toggles are added please document them
 // in configuration.md, too
@@ -71,6 +72,17 @@
 
 #endif // __clang__
 
+
+////////////////////////////////////////////////////////////////////////////////
+// Cygwin
+#ifdef __CYGWIN__
+
+#   if !defined(CATCH_CONFIG_POSIX_SIGNALS)
+#       define CATCH_INTERNAL_CONFIG_NO_POSIX_SIGNALS
+#   endif
+
+#endif // __CYGWIN__
+
 ////////////////////////////////////////////////////////////////////////////////
 // Borland
 #ifdef __BORLANDC__
@@ -253,6 +265,10 @@
 #if defined(CATCH_INTERNAL_CONFIG_WINDOWS_SEH) && !defined(CATCH_CONFIG_NO_WINDOWS_SEH) && !defined(CATCH_CONFIG_WINDOWS_SEH)
 #   define CATCH_CONFIG_WINDOWS_SEH
 #endif
+// This is set by default, because we assume that unix compilers are posix-signal-compatible by default.
+#if !defined(CATCH_INTERNAL_CONFIG_NO_POSIX_SIGNALS) && !defined(CATCH_CONFIG_NO_POSIX_SIGNALS) && !defined(CATCH_CONFIG_POSIX_SIGNALS) 
+#   define CATCH_CONFIG_POSIX_SIGNALS
+#endif
 
 #if !defined(CATCH_INTERNAL_SUPPRESS_PARENTHESES_WARNINGS)
 #   define CATCH_INTERNAL_SUPPRESS_PARENTHESES_WARNINGS

include/internal/catch_fatal_condition.hpp

@@ -103,6 +103,17 @@ namespace Catch {
 
 #else // Not Windows - assumed to be POSIX compatible //////////////////////////
 
+#  if !defined(CATCH_CONFIG_POSIX_SIGNALS)
+
+namespace Catch {
+    struct FatalConditionHandler {
+        void reset() {}        
+    };
+}
+
+
+#  else // CATCH_CONFIG_POSIX_SIGNALS is defined
+
 #include <signal.h>
 
 namespace Catch {
@@ -183,6 +194,8 @@ namespace Catch {
 
 } // namespace Catch
 
+#  endif // CATCH_CONFIG_POSIX_SIGNALS
+
 #endif // not Windows
 
 #endif // TWOBLUECUBES_CATCH_FATAL_CONDITION_H_INCLUDED