I'm trying to build some CUDA code using GCC 6.2.1, the default compiler of my distribution (Note: not a GCC version officially supported by CUDA, so you can call this experimental). This is code which builds fine with GCC 4.9.3 and both CUDA versions 7.5 and 8.0.
Well, if I build the following (close-to) minimal example:
#include <tuple>
int main() { return 0; }
with the command-line
nvcc -std=c++11 -Wno-deprecated-gpu-targets -o main main.cu
I get the following errors:
/usr/local/cuda/bin/../targets/x86_64-linux/include/math_functions.h(8897): error: cannot overload functions distinguished by return type alone
/usr/local/cuda/bin/../targets/x86_64-linux/include/math_functions.h(8901): error: cannot overload functions distinguished by return type alone
2 errors detected in the compilation of "/tmp/tmpxft_000071fe_00000000-9_b.cpp1.ii".
Why is that? How can I correct/circumvent this?
TL;DR: Forget about it. Only use CUDA 8.x with GCC 5.x , and CUDA 9 or later with GCC 6.x
It seems other people have seen this issue with GCC 6.1.x and the suggestion is to add the following flags to nvcc: -Xcompiler -D__CORRECT_ISO_CPP11_MATH_H_PROTO (yes, two successive flags; see nvcc --help for details). (But I can't report complete success since other issues pop up instead.)
But remember that GCC 5.4.x is the latest supported version, and that probably has a good reason, so it's somewhat of a wild goose chase to force GCC 6.x onto it - especially when CUDA 9 is available now.