The customer is creating their C/C++ code using a "custom" compiler, so the customer wants to use that compiler at the moment of scanning with sourceanalyzer.
Fortify Static Code Analyzer
The customer is using a "custom" compiler based on one of the supported compilers by Fortify SCA, for example, arm-none-eabi-gcc, which is a compiler that allows the customer writing C code for firmware. This compiler is based on GCC compiler, so the customer needs to use that compiler for the build action of the project.
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