Merge topic 'allow_upper_case_cpp_and_others'

7944e4e Allow testing of .CPP on WIN32 as it is a case insensitive OS and should work.
ba0a890 Only test for .CPP on Microsoft compilers which will handle .CPP as c++.
d26cd46 Only use .CPP .CXX and .C++ do not work by default with g+++.
ced61f5 Let CMake recognize .CPP .CXX and .C++ as c++ files.

Modules/CMakeCXXCompiler.cmake.in

@@ -21,8 +21,8 @@ IF(CMAKE_COMPILER_IS_MINGW)
   SET(MINGW 1)
 ENDIF(CMAKE_COMPILER_IS_MINGW)
 SET(CMAKE_CXX_COMPILER_ID_RUN 1)
-SET(CMAKE_CXX_IGNORE_EXTENSIONS inl;h;H;o;O;obj;OBJ;def;DEF;rc;RC)
-SET(CMAKE_CXX_SOURCE_FILE_EXTENSIONS C;M;c++;cc;cpp;cxx;m;mm)
+SET(CMAKE_CXX_IGNORE_EXTENSIONS inl;h;hpp;HPP;H;o;O;obj;OBJ;def;DEF;rc;RC)
+SET(CMAKE_CXX_SOURCE_FILE_EXTENSIONS C;M;c++;cc;cpp;cxx;m;mm;CPP)
 SET(CMAKE_CXX_LINKER_PREFERENCE 30)
 SET(CMAKE_CXX_LINKER_PREFERENCE_PROPAGATES 1)
 

Tests/CxxOnly/CMakeLists.txt

@@ -2,7 +2,10 @@
 project (CxxOnly CXX)
 
 set(CMAKE_DEBUG_POSTFIX "_test_debug_postfix")
-add_library(testcxx1 STATIC libcxx1.cxx)
+if(WIN32)
+  set(EXTRA_SRCS test.CPP)
+endif()
+add_library(testcxx1 STATIC libcxx1.cxx ${EXTRA_SRCS})
 add_library(testcxx2 SHARED libcxx2.cxx)
 add_executable (CxxOnly cxxonly.cxx)
 target_link_libraries(CxxOnly testcxx1 testcxx2)

Tests/CxxOnly/cxxonly.cxx

@@ -1,10 +1,16 @@
 #include "libcxx1.h"
 #include "libcxx2.h"
+#ifdef _MSC_VER
+extern int testCPP;
+#endif
 
 #include <stdio.h>
 
 int main ()
 {
+#ifdef _MSC_VER
+  testCPP = 1;
+#endif
   if ( LibCxx1Class::Method() != 2.0 )
     {
     printf("Problem with libcxx1\n");

Tests/CxxOnly/test.CPP

@@ -0,0 +1 @@
+int testCPP;