When passing character strings, the length must follow as separate Thus C must pass FORTRAN arguments as a pointer.

gfortran - GNU FORTRAN compiler man pageĪll arguments in FORTRAN are passed by reference and not by value.

Subroutine subra(), issue the comand ' break subra_'. Thus when setting a break point at the Fortran With names as they appear in the symbol table.

NOTE: When debugging with GDB, the Fortran subroutines must be referenced GNU g77 FORTRAN can be case sensitive with the compile option ' -fsource-case-preserve'. The older g77 compiler option ' -fsource-case-lower' is also default.

The gfortran compiler option ' -fcase-lower is default. Note: The case in FORTRAN is NOT preserved and is represented in lower case in the object file. One may view the object file with the command nm (i.e.: nm file.o). Will alter the default naming in the object code and thus affect linking. The GNU gfortran comiler flags ' -fno-underscoring' (older f77: ' -fno-underscore') and ' -fno-second-underscore' This is also true for common block/structure names as shown above. The entry point names for some FORTRAN compilers have an underscore appended Pass array size 'n' and declare array as x įortran subroutines are the equivalent of 'C' functions returning ' (void)'.

It is best not to re-dimension multi dimensional arrays within a function.

In FORTRAN 90, also check out the ' RESHAPE' directive.

FORTRAN 90: INTEGER, DIMENSION(2,3,4) :: I.

Native C layout (row-major order) is NOT equivalent to the FORTRAN layout: int a a Native FORTRAN layout (collumn-major order): INTEGER A(2,3) a(1,1) Order of multi dimensional arrays in C/C++ is the opposite of FORTRAN.

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