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Spin2cpp is a program for converting Spin, BASIC, or C code to binary, PASM (Parallax Propeller 1 assembly), P2ASM (Parallax P2 assembly), C, or C++.

flexspin is a slightly different front end to the same functionality, designed to be compatible with other spin compilers.

flexcc is a third front end designed to accept the arguments normally given to C compilers (cc). Like the others, it can actually accept Spin and BASIC input as well as C.

The command line options for spin2cpp and flexspin are documented in Spin2cpp.md and Flexspin.md respectively.

Documentation for the various front ends (languages accepted as input) are in doc. The BASIC language is the best documented. The C and Spin documentation just cover extensions and deviations from the standard (C99 in the case of C, and the original Propeller compiler in the case of Spin).

On most Linux installations you should be able to build with "make", which will place binaries in the "build" folder.

On macOS the procedure is similar, but you'll probably have to manually install a newer version of bison (the one that comes with macOS is too old). You'll need at least bison 3.0.

On Windows it should be possible to build using msys or a similar gcc based build environment, but you'll need to install bison 3.0 or later, flex, gcc, and make.