New in version 3.18.
Control whether the Fortran source file should be unconditionally preprocessed.
If unset or empty, rely on the compiler to determine whether the file should be preprocessed. If explicitly set to
OFF then the file does not need to be preprocessed. If explicitly set to
ON, then the file does need to be preprocessed as part of the compilation step.
When using the
Ninja generator, all source files are first preprocessed in order to generate module dependency information. Setting this property to
OFF will make
Ninja skip this step.
Consider using the target-wide
Fortran_PREPROCESS property if all source files in a target need to be preprocessed.
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