add predefined macro PROJECT_ROOT#792
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St-Maxwell wants to merge 1 commit intofortran-lang:mainfrom
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Inspired by #766
This pull request adds
PROJECT_ROOTas a predefined macro. If preprocess is activated, this macro definition is passed to the source code.And it is possible to add more predefined macros.
P.S. I find it is quite complex using macro in Fortran source code. Anyway, it is the problem of preprocessor itself.