Malcolm Cohen, a NAG principal technical consultant and Editor of the ISO/IEC Fortran Standard comments, “Fortran users do not always consider that they ought not to depend on a single compiler, which may be set to sacrifice accuracy, standards-conformance, and portability in exchange for speed. NAG’s Fortran Builder is probably the best checking compiler available. It is very exact in the interpretation of Fortran standards and incorporates cutting-edge run-time checking features including: procedure interface checking across multiple files; undefined variable trapping; memory leak detection; and more. Many report that their use of NAG Fortran Builder for maintaining standards, debugging, and verification of their Fortran programs is invaluable, even if they also use another compiler”.
NAG Fortran Builder is for the Microsoft Windows environment and provides a Fortran-aware editor, build system, GUI debugger, and help system for Fortran. The NAG Fortran Compiler is also available for other platforms.