[Octave-bug-tracker] [bug #48531] LTO warnings in liboctave

[Mike Miller]

Follow-up Comment #3, bug #48531 (project octave):

Ok, I do see these warnings with GCC 6 but not 5.

I guess this may be due to or a side effect of some GCC 6 changes related to:

> Type merging was fixed to handle C and Fortran interoperability
> rules as defined by the Fortran 2008 language standard.

from https://gcc.gnu.org/gcc-6/changes.html.

I don't see what you're saying about the existing code assuming that a
std::complex<float> can be converted to a C float complex type. Does putting a
function signature in an extern "C" block somehow allow the compiler to treat
a std::complex<T> argument as a C complex argument? The existing code is
written to ensure that the C++ code passes a pointer to a std::complex<T>
array, and the Fortran code is expecing a Fortran complex array. The C++
signature could be written with a void* parameter type instead and it would
still work as well.

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