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Preprocessor

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Roy Eltham edited this page Apr 7, 2020 · 4 revisions

OpenSpin's Preprocessor

The preprocessor is on by default. You can turn it off with the -p command line option.

Supported Commands

  • #define FOO
  • simple macros with no arguments, basic substitution & #ifdef checking
  • #undef
  • #ifdef FOO / #ifndef FOO
  • #else / #elseifdef FOO / #elseifndef FOO
  • #endif
  • #error message
  • #warning message
  • #info message
  • #include “file”

Alternative Preprocessor Mode

If you use the -a command line option, that will turn on alternative mode for the preprocessor. The difference is in how #define and #error work.

For #define, if you just define something (e.g. #define FOO or use the -D command line option) then it will not perform substitution in the code. It will just satisfy #ifdef and similar checks.

For #error, it will exit the compiler immediately after displaying the error message.

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