I have observed an issue with intel c++ compiler using old versions of g++ and support for std=c++14 and std=c++17
Short background : We use an enterprise Linux Version, SLES12SP4, and by default the compiler ist gcc 4.8.5
A perfectly supported std c++14 code ( memory std::make_unique<myClass()>) will not compile with icpc -std=c++14 -v 19.** unless I have added in the path a recent version of gcc , for example 8.0.3 . I have examined the output of icpc /g++ -E and icpc is using the CPP found in the path , and the STL headers in the path of CPP.
I always tought , that the icpc has an integrated preprocessor, and also STL headers making it inmune to the current installed version of gcc . There is list of supported features c++14 c++17, but not sure if there is no parallel to the recommended gcc .
1) Is there a parallel of which gcc suits best to icpc ? Also icpc 2018 failed to build the code above , but icpc 2019 compiled it fine using the CPP-8.0.3
2) Is there a way , using a configuration file on enviroment to instruct / tell icpc where to find the preprocessor/gcc and STL librares? a system-wide export PATH is not recommend in my case .