Hello Gabriel
On 09.03.09, you wrote:
> The above sqrt() function is distinct from the C version, because
> it has a C++ linkage. Consequently, I would expect that if
> __builtin_sqrtf() is not available, the compiler would emit a
> library call to the out-of-line C version.
But it dont work.
I have define in math.h this func.see my below
example source that show important parts.look a little ugly, but this is
done to avoid in -o3 the remove of some function calls.
real problem i see in libdirac
inline float sqrtf(float x)
{
return sqrt(x);
}
.......
int main(int argc, char** argv)
{
........
printf("%f\n",sqrtf((float)argc)); // work
printf("%f\n",std::sqrt(static_cast<float>(argc))); // work not
printf("%f\n",std::sqrt(static_cast<double>(argc))); // work
......
when i change c++/4.3.2/cmath to this code, then all work
....
using ::sqrt;
inline float
sqrt(float __x)
- { return __builtin_sqrtf(__x); }
+ { return sqrtf(__x); }
.....
now you can come to the idea and add it as link func, maybe then it work.
But then i get error at that line, but other lines work.
printf("%f\n",sqrtf((float)argc));
undefined reference to `sqrtf(float)'
You see there is the _ not in.normaly funcs that not find have a _ before
To get all work, it seem i need add the same function add in math.h and in
the linker
lib or change cmath file and remove all __builtin_ commands the architecture
not have.
> On Mon, Mar 9, 2009 at 2:42 AM, Bernd Roesch <[email protected]> wrote:
>> Hello Richard
>>
>> On 06.03.09, you wrote:
>>
>> ah thanks for info, i understand now too wy sqrtf, fmod (work in C
>> programs)
>> get linker error on C++ programs but sqrt and some other work on
>> platform
>> 68k.
>> in c++/4.3.2/cmath include
>>
>> is this code.
>>
>> using ::sqrt;
>>
>> inline float
>> sqrt(float __x)
>> { return __builtin_sqrtf(__x); }
>>
>> But .md file of many architetures contain no entry for this.I see only
>> i386,
>> rs6000, ia64, sh contain code for this.(I search for sqrtf and list
>> files
>> that contain this)
>> the header files are build during GCC build, i change nothing.
>>
>> Is there something wrong during compiler Build process ?
>
> The above sqrt() function is distinct from the C version, because
> it has a C++ linkage. Consequently, I would expect that if
> __builtin_sqrtf() is not available, the compiler would emit a
> library call to the out-of-line C version.
>
> -- Gaby
Regards
