need to recognize both Clang and AppleClang

ChangeLog

+
+2016-04-21 Lynn Garren <garren@fnal.gov> 
+
+  * cmake: need to recognize both Clang and AppleClang
+
 ==============================
 19.04.16 Release CLHEP-2.3.2.1
 ==============================

cmake/Modules/ClhepVariables.cmake

@@ -95,6 +95,12 @@ macro( _clhep_verify_cxx11 )
     else()
       set( HAVE_STDCXX true )
     endif()
+  elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" )
+    if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5 )
+      message( FATAL_ERROR "CLHEP now requires c++11 support with clang 3.5 or later")
+    else()
+      set( HAVE_STDCXX true )
+    endif()
   elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel" )
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 14.0)
       message( FATAL_ERROR "c++11 extension is not available for ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}")
@@ -119,6 +125,12 @@ macro( _clhep_verify_cxx1y )
     else()
       set( HAVE_STDCXX true )
     endif()
+  elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" )
+    if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5 )
+      message( FATAL_ERROR "c++1y extension is not available for ${CMAKE_CXX_COMPILER_ID}${CMAKE_CXX_COMPILER_VERSION}")
+    else()
+      set( HAVE_STDCXX true )
+    endif()
   elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel" )
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 15.0)
       message( FATAL_ERROR "c++11 extension is not available for ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}")
@@ -143,6 +155,12 @@ macro( _clhep_verify_cxx14 )
     else()
       set( HAVE_STDCXX true )
     endif()
+  elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" )
+    if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5 )
+      message( FATAL_ERROR "c++14 extension is not available for ${CMAKE_CXX_COMPILER_ID}${CMAKE_CXX_COMPILER_VERSION}")
+    else()
+      set( HAVE_STDCXX true )
+    endif()
   elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel" )
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 16.0)
       message( FATAL_ERROR "c++14 extension is not available for ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}")
@@ -188,6 +206,8 @@ macro( _clhep_check_cxxstd )
   if( DEFINED HAVE_STDCXX )
     if( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" )
 	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CLHEP_BUILD_CXXSTD}" )
+    elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" )
+	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CLHEP_BUILD_CXXSTD}" )
     elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel" )
 	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CLHEP_BUILD_CXXSTD" )
     elseif(CMAKE_COMPILER_IS_GNUCXX)
@@ -227,6 +247,8 @@ macro( clhep_set_compiler_flags )
   endif( CLHEP_DEBUG_MESSAGES )
   if( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" )
     set(CMAKE_C_FLAGS "-O -pedantic -Wall ${CMAKE_C_FLAGS}")
+  elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" )
+    set(CMAKE_C_FLAGS "-O -pedantic -Wall ${CMAKE_C_FLAGS}")
   elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel" )
     set(CMAKE_C_FLAGS "-O -ansi -pedantic -Wall {CMAKE_C_FLAGS}")
     set(CMAKE_CXX_FLAGS "-O -ansi -pedantic -Wall ${CMAKE_CXX_FLAGS}")
@@ -235,6 +257,8 @@ macro( clhep_set_compiler_flags )
   endif()
   if( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" )
     set(CMAKE_CXX_FLAGS "-O -pedantic -Wall ${CMAKE_CXX_FLAGS}")
+  elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" )
+    set(CMAKE_CXX_FLAGS "-O -pedantic -Wall ${CMAKE_CXX_FLAGS}")
   elseif(CMAKE_COMPILER_IS_GNUCXX)
     set(CMAKE_CXX_FLAGS "-O -ansi -pedantic -Wall -D_GNU_SOURCE ${CMAKE_CXX_FLAGS}")
   endif()