Disabled constexpr testing on MSVC.

Until recently, CMake reported VS2015 as not supporting constexpr.
However, constexpr support was added in the VS2015 release, and CMake
now reports accordingly.

The constexpr support in VS2015 is too buggy to build Better Enums.
This change disables testing on VS2015 with constexpr support, because
those tests will fail.

Also adapted to a change in the Cygwin path prefix in AppVeyor and
fixed an issue in the Travis build with wget being unable to retrieve
from www.cmake.org's new redirect to cmake.org.

.travis.yml

@@ -23,7 +23,7 @@ before_script:
   - sudo apt-get update -qq
   - sudo apt-get install --allow-unauthenticated $COMPILER
   - git clone https://github.com/CxxTest/cxxtest.git cxxtest-ro
-  - wget http://www.cmake.org/files/v3.2/cmake-3.2.3-Linux-x86_64.tar.gz
+  - curl -O https://cmake.org/files/v3.2/cmake-3.2.3-Linux-x86_64.tar.gz
   - tar -xzf cmake-3.2.3-Linux-x86_64.tar.gz
   - sudo cp -fR cmake-3.2.3-Linux-x86_64/* /usr
 

test/CMakeLists.txt

@@ -22,6 +22,14 @@ else()
     set(SUPPORTS_RELAXED_CONSTEXPR 1)
 endif()
 
+# Current versions of CMake report VS2015 as supporting constexpr. However, the
+# support is too buggy to build Better Enums. Avoid trying to build constexpr
+# configurations on MSVC.
+if(${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
+    set(SUPPORTS_CONSTEXPR 0)
+    set(SUPPORTS_RELAXED_CONSTEXPR 0)
+endif()
+
 list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_strong_enums ENUM_CLASS_INDEX)
 if(ENUM_CLASS_INDEX EQUAL -1)
     set(SUPPORTS_ENUM_CLASS 0)

test/Makefile

@@ -36,7 +36,7 @@ define PATH_FIX
 sed 's!include "/!include "C:/cygwin/!g' $1 > $$$$ && mv $$$$ $1
 endef
 SUFFIX := .exe
-CXXTESTGEN := python `which cxxtestgen | sed s!/cygdrive/c!c:/!`
+CXXTESTGEN := python `which cxxtestgen | sed -E 's!(/cygdrive)?/c/!c:/!'`
 
 endif