I want to use the new features of C++14 on Linux. Which free compiler grants these features?
cppreference has a full feature-support matrix.
Clang and Cray(?) have full ++14 support.
GCC 5, Sun/Oracle C++ 5.15, and MSVC 19.10 support ++14 with the exception of "clarifying memory allocation".
GCC 7 has support for all ++17 features except "Standardization of Parallelism TS".