> On May 24, 2016, at 1:19 PM, Palmer, Thomas <[email protected]> wrote: > > EDK2 Clang users: > > I've been curious about using CLANG on one of our systems to > try out the llvm ecosystem. I can compile my project in both GCC48 and > VS2013, however, when I tried CLANG35 on a Ubuntu 14.04 system, I got this > error: > > Building ... > MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf > [IA32] > MdePkg/Library/PeiMemoryAllocationLib/MemoryAllocationLib.c:58:10: warning: > cast to 'void *' from smaller integer type 'UINTN' (aka 'unsigned int') > [-Wint-to-void-pointer-cast] > return (VOID *) (UINTN) Memory; > > I surmise the VOID* or UINTN must be incorrectly configured somewhere? Or > perhaps I missed some crucial setup steps? >
Thomas, VOID * is just a pointer. UINTN should be the size of a pointer. The only way I can reproduce this error is to try and compile IA32 code with the x86_64 version of the compiler. I'm not 100% sure but I think you only get this error if sizeof(unsigned int) < sizeof (void *). For IA32 I would expect UINTN to be an unsigned int and a pointer fits into an int? UINTN is defined here: https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Ia32/ProcessorBind.h for IA32. Are you sure you are using the correct compiler flags for IA32, for the Xcode version of clang that means pass: -arch i386. No arch usually defaults to x86_64. ~/work/Compiler>cat void.c typedef unsigned long long UINT64; typedef unsigned int UINT32; typedef UINT32 UINTN; void * Test (UINT64 Memory) { return (void *) (UINTN) Memory; } ~/work/Compiler>clang -S void.c void.c:10:10: warning: cast to 'void *' from smaller integer type 'UINTN' (aka 'unsigned int') [-Wint-to-void-pointer-cast] return (void *) (UINTN) Memory; ^ 1 warning generated. ~/work/Compiler>clang -arch i386 -S void.c Thanks, Andrew Fish _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
