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I want to use the new features of C++14 on Linux. Which free compiler grants these features?

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    I guess you mean which "C++" compiler... – AlefSin Mar 8 '18 at 20:31
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    Just to be clear: the C++14 standard has been withdrawn (ie. is outdated). The current standard is C++17. The features you want haven't been "new" for a while now. – Stephen M. Webb Mar 8 '18 at 21:30
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    @StephenM.Webb: "Withdrawn" is a very strong word. The overwhelming majority of systems out there will just be migrating to C++14, if not C++11. Many will still be legacy C++98/03. C++14 does not cease to exist just because a newer alternative is available on cutting-edge toolchains. ISO has not "withdrawn" it, although from a pedantic point of view one might argue that C++17 supersedes it. – Lightness Races in Orbit Mar 8 '18 at 21:45
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    @LightnessRacesinOrbit "Withdrawn" is a very strong word but also a correct one. iso.org/standard/64029.html – richardb Mar 8 '18 at 22:44
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According to the standards support pages for clang and gcc, you can use gcc >= 5.0 or clang >= 3.4. Most C++14 support was added in 4.9 for gcc, but a few features did not make it in until 5.0.

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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".

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Default gcc compilers of Debian distro implements c++14. If your have RedHat distro try using devtoolset-6-gcc or devtoolset-6-gcc-c++

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