Andrew,
I agree the C code is correct, which is why I figure I must not be
using CLANG correctly.
I do not see the -arch 386 flag in the compile command. I see that
flag for XCLANG, but not for CLANG35. I'll try to hack the Conf file to
include that flag for IA32.
Thomas
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Tuesday, May 24, 2016 3:46 PM
To: Palmer, Thomas <[email protected]>
Cc: [email protected]
Subject: Re: [edk2] Question on CLANG build
> 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/PeiServicesTablePointerLi
> bIdt.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
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