编译fortran，含#ifdef时，报错，提示bad # preprocessor line。
原因：
The message
warning #5117: Bad # preprocessor line
is potentially a little misleading. It suggests that the code has been passed through the preprocessor and it’s the preprocessor that’s unhappy. That isn’t always the case: ifort also produces this warning message when preprocessor directives occur in the source file but the preprocessor isn’t invoked.
To ensure that the preprocessor is run you have a couple of options:
- add the flag
-fpp(or-cpp) to the compilation command; - name the free-form source file with the suffix
.F90(note the capital).