I want to use the new features of C++14 on Linux. Which free compiler grants these features?
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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".
gcc compilers of Debian distro implements
If your have RedHat distro try using