Hi,
It's no big deal, but current Strawberry Perl 32-bit and 64-bit compilers
create executables that crash when expq() is called.
Here's the minimalistic demo script:
####################
#include <quadmath.h>
int main (void) {
__float128 r;
r = expq(2.0Q);
r = sqrtq(2.0Q);
r = fabsq(2.0Q);
r = sinq(2.0Q);
r = logq(2.0Q);
r = cosq(2.0Q);
return 0;
}
####################
The resultant executable crashes when run, but remove the expq() call and
there's no problem. (Link to -lquadmath when building the above program.)
It's not just MinGW64's gcc-4.6.3 compilers that are affected. I find the
same with their 64-bit gcc-4.7.0, and 4.8.1 compilers. (I haven't tested any
other MinGW64 compilers.)
I've also found that mingw.org's gcc-4.7.0 does *not* suffer this problem;
nor does Ubuntu's gcc-4.6.3 ... so I guess I probably should report this to
the mingw64 project.
BTW, the perl relevance here is that, because of this bug, Math::Float128
crashes its test suite when expq() gets called. But I don't think that
there's a high demand for this module, so I wouldn't be too concerned about
that aspect.
Also of slight relevance to Strawberry Perl is the fact that
c/lib/gcc/[whatever]-w64-mingw32/4.6.3 is not in $Config{libpth}.
As a consequence perl does not automatically find -lquadmath when the
Math::Float128 Makefile.PL is run, and perl therefore removes the link. (The
gcc linker can find -lquadmath without any help at all ... but it won't look
for that library if perl has removed the link.)
Cheers,
Rob
