I am trying to compile a fortran program with a windows/linux switch using cpp's
#ifdef __linux__.
When running cpp directly the __linux__ macros are defined:
cpp -E -dM test.f90 | grep linux
#define __linux 1
#define __linux__ 1
#define __gnu_linux__ 1
#define linux 1
but when run via gfortran (as when I want to compile the program) they are not:
gfortran -cpp -E -dM test.f90 | grep define
#define __ATOMIC_ACQUIRE 2
#define __CHAR_BIT__ 8
#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __ORDER_PDP_ENDIAN__ 3412
#define __FINITE_MATH_ONLY__ 0
#define __GNUC_PATCHLEVEL__ 0
#define __SIZEOF_INT__ 4
#define __SIZEOF_POINTER__ 8
#define __GFORTRAN__ 1
#define __STDC_HOSTED__ 0
#define __NO_MATH_ERRNO__ 1
#define __SIZEOF_FLOAT__ 4
#define __pic__ 2
#define _LANGUAGE_FORTRAN 1
#define __SIZEOF_LONG__ 8
#define __SIZEOF_SHORT__ 2
#define __GNUC__ 7
#define __pie__ 2
#define __SIZEOF_LONG_DOUBLE__ 16
#define __BIGGEST_ALIGNMENT__ 16
#define __ATOMIC_RELAXED 0
#define _LP64 1
#define __ORDER_BIG_ENDIAN__ 4321
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __SIZEOF_SIZE_T__ 8
#define __PIC__ 2
#define __SIZEOF_DOUBLE__ 8
#define __ATOMIC_CONSUME 1
#define __GNUC_MINOR__ 4
#define __PIE__ 2
#define __LP64__ 1
#define __ATOMIC_SEQ_CST 5
#define __SIZEOF_LONG_LONG__ 8
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_RELEASE 3
#define __VERSION__ "7.4.0"
What am I doing wrong?
