llvm dev - Jun 2011 - [LLVMdev] sparse typedef int v8qi __attribute__ ((mode(V8QI))) warning

While solving a clang build issue with netpbm10 on fink darwin11, I noticed that
clang seems to provide poor error messages compared to llvm-gcc. For llvm-gcc,
we get
the very helpful warning...

libpbm3.c: In function 'packBitsWithMmxSse':
libpbm3.c:120: warning: specifying vector types with __attribute__ ((mode)) is
deprecated
libpbm3.c:120: warning: use __attribute__ ((vector_size)) instead

whereas clang only produces...

libpbm3.c:120:38: error: unknown machine mode 'V8QI'
    typedef int v8qi __attribute__ ((mode(V8QI)));
                                     ^
libpbm3.c:129:36: error: passing 'v8qi' (aka 'int') to parameter
of incompatible type '__attribute__((__vector_size__(8 * sizeof(char))))
char'
            __builtin_ia32_pcmpeqb(*(v8qi*) (&bitrow[col]), *(v8qi*)
&zero64);
                                   ^~~~~~~~~~~~~~~~~~~~~~~
libpbm3.c:131:37: error: passing 'const v8qi' (aka 'const int')
to parameter of incompatible type '__attribute__((__vector_size__(8 *
sizeof(char)))) char'
            __builtin_ia32_pmovmskb(compare);
                                    ^~~~~~~

which is much more cryptic. Any idea why this is the case?
            Jack

On Jun 30, 2011, at 4:41 PM, Jack Howarth wrote:
>   While solving a clang build issue with netpbm10 on fink darwin11, I
noticed that
> clang seems to provide poor error messages compared to llvm-gcc. For
llvm-gcc, we get
> the very helpful warning...
> 
> libpbm3.c: In function 'packBitsWithMmxSse':
> libpbm3.c:120: warning: specifying vector types with __attribute__ ((mode))
is deprecated
> libpbm3.c:120: warning: use __attribute__ ((vector_size)) instead
> 
> whereas clang only produces...
> 
> libpbm3.c:120:38: error: unknown machine mode 'V8QI'
>    typedef int v8qi __attribute__ ((mode(V8QI)));
>                                     ^
> libpbm3.c:129:36: error: passing 'v8qi' (aka 'int') to
parameter of incompatible type '__attribute__((__vector_size__(8 *
sizeof(char)))) char'
>            __builtin_ia32_pcmpeqb(*(v8qi*) (&bitrow[col]), *(v8qi*)
&zero64);
>                                   ^~~~~~~~~~~~~~~~~~~~~~~
> libpbm3.c:131:37: error: passing 'const v8qi' (aka 'const
int') to parameter of incompatible type
'__attribute__((__vector_size__(8 * sizeof(char)))) char'
>            __builtin_ia32_pmovmskb(compare);
>                                    ^~~~~~~
> 
> which is much more cryptic. Any idea why this is the case?
Seems like a reasonable enhancement request.

-eric

ps btw, you want cfe-dev next time.