[CMake] Build library with specific compil flags for a few files

[pellegrini]

Hello everybody,

I have a library for which almost all the files should be compiled (e.g. 
g95) with the same compilation flags  (that I will call later 
flag_debug, flag_release ...) excepted a few ones for which I have to 
use slightly different compilation flags (called later flag1_debug, 
flag1_release ...).

As in both cases the flags are different from the default ones, I was 
told on the cmake list to create a personal Compiler/G95-Fortran.cmake 
file that was placed in my Src directory and that contains the following 
lines:

set(CMAKE_Fortran_FLAGS_INIT "")
set(CMAKE_Fortran_FLAGS_DEBUG_INIT flag_debug)
set(CMAKE_Fortran_FLAGS_RELEASE_INIT flag_release)
set(CMAKE_Fortran_MODDIR_FLAG "-fmod=")
set(CMAKE_Fortran_VERBOSE_FLAG "-v")

This file allowing to avoid the declaration of the flags in the 
CMakeLists.txt file. But, how to proceed for the few files for which I 
have to use
different compiler flags ? In that case, I do not see any way to escape 
from writing specifically the flags in the CMakeLists.txt file with 
command such as:

if(CMAKE_BUILD_TYPE STREQUAL RELEASE)
    set_source_files_properties(File1 PROPERTIES COMPILE_FLAGS 
flag1_release)
    set_source_files_properties(File2 PROPERTIES COMPILE_FLAGS 
flag1_release) ...
elseif(CMAKE_BUILD_TYPE STREQUAL DEBUG)
    set_source_files_properties(File1 PROPERTIES COMPILE_FLAGS flag1_debug)
    set_source_files_properties(File2 PROPERTIES COMPILE_FLAGS 
flag1_debug) ...
...
endif()

would you have any idea about how to esacpe from this kind of 
implementation ? is that so ugly ?

thanks

Eric



-- 
Eric Pellegrini
Calcul Scientifique
Insitut Laue-Langevin
Grenoble, France