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Adding compilation options for flex/lex and bison/yacc
Adding the options LAEX_FLAGS and YACC_FLAGS to the COMPILE_FLAGS for flex/lex bison/yacc to create more flexibility during compilation. Example: when one wants to compile e.g. fortranscanner.l with the flex debug flag -d one can perform the following steps: - touch fortranscanner.l in te src directory - run make LEX_FLAGS=-d or set environment variable LEX_FLAGS to -d run make to undo this touch again forttranscanner -l and run make (don't forget to unset the environment variable LEX_FLAGS) Analogous for bison/yacc wit the YACC_FLAGS
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