cmake 预处理

 You are only adding it to the main target.. I didn't realize. Add it to the mod target as well:

set_target_properties(main mod PROPERTIES COMPILE_FLAGS "-fpp")

Second option is to name the files .F90 instead of .f90, which will automatically trigger precompilation.

 

Third option is to just add -fpp flag globally to cmake flags:

set(CMAKE_Fortran_COMPILE_FLAGS ${CMAKE_Fortran_COMPILE_FLAGS} -fpp)

 

cmake_minimum_required(VERSION 2.6)
project(test Fortran)
option(DEFINE_MORE "If set to ON, -DMORE will be defined" OFF)
option(DEFINE_LESS OFF)
set(FORTRAN_PREPROCESS_FLAG "-fpp")

# force gfortran to preprocess the input files
# change this to "-fpp" for ifort (that's the ones i know...)

#if(DEFINE_MORE)
  add_definitions(-DMORE -DLESS)
#endif(DEFINE_MORE)

add_executable(test test.f90)
set_target_properties(test PROPERTIES COMPILE_FLAGS "${FORTRAN_PREPROCESS_FLAG}")