Link with -fPIC when using Clang.

Remove the need for a few workarounds by handling this in just one place.

cmake/OptimalOptions.cmake

@@ -43,9 +43,11 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
 	IF(CMAKE_BUILD_TYPE STREQUAL "debug")
 		ADD_DEFINITIONS(-D_DEBUG)
 	ENDIF(CMAKE_BUILD_TYPE STREQUAL "debug")
+ENDIF(CMAKE_COMPILER_IS_GNUCXX)
 
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+ENDIF()
 
 IF(MSVC)
 	# @@ Some of these might only be available in VC8.

src/bc6h/CMakeLists.txt

@@ -15,9 +15,3 @@ SET(BC6H_SRCS
 
 ADD_LIBRARY(bc6h STATIC ${BC6H_SRCS})
 TARGET_LINK_LIBRARIES(bc6h nvcore nvmath)
-
-IF(NOT WIN32)
-    IF(CMAKE_COMPILER_IS_GNUCXX)
-        SET_TARGET_PROPERTIES(bc6h PROPERTIES COMPILE_FLAGS -fPIC)
-    ENDIF(CMAKE_COMPILER_IS_GNUCXX)
-ENDIF(NOT WIN32)

src/bc7/CMakeLists.txt

@@ -25,9 +25,3 @@ ADD_LIBRARY(bc7 STATIC ${BC7_SRCS})
 TARGET_LINK_LIBRARIES(bc7 nvcore nvmath)
 
 TARGET_LINK_LIBRARIES(bc7 nvmath)
-
-IF(NOT WIN32)
-    IF(CMAKE_COMPILER_IS_GNUCXX)
-        SET_TARGET_PROPERTIES(bc7 PROPERTIES COMPILE_FLAGS -fPIC)
-    ENDIF(CMAKE_COMPILER_IS_GNUCXX)
-ENDIF(NOT WIN32)

src/nvtt/squish/CMakeLists.txt

@@ -21,15 +21,3 @@ SET(SQUISH_SRCS
 	simd_ve.h)
 
 ADD_LIBRARY(squish STATIC ${SQUISH_SRCS})
-
-IF(NOT WIN32)
-
-	IF("${CMAKE_CXX_COMPILER}" MATCHES "clang(\\+\\+)?$" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-		SET(CMAKE_COMPILER_IS_CLANGXX 1)
-	ENDIF()
-
-    IF(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
-		SET_TARGET_PROPERTIES(squish PROPERTIES COMPILE_FLAGS -fPIC)
-    ENDIF(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
-ENDIF(NOT WIN32)
-