increase support for more mainstream compilers for PIC and debug instrumentation; especially explicitly check for the GCC CLI as the Intel C/C++ compiler also defines __GNUC__ and is rather compatible to GCC but unfortunately doesn't understand all CLI options like -Wxxx of GCC
increase support for more mainstream compilers for PIC and debug instrumentation; especially explicitly check for the GCC CLI as the Intel C/C++ compiler also defines __GNUC__ and is rather compatible to GCC but unfortunately doesn't understand all CLI options like -Wxxx of GCC

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