Replace IF statement with generator expressions

CMakeLists.txt

@@ -7,10 +7,28 @@ project(
 
 option(CABLE_MPI "Build the MPI executable" OFF)
 
+# third party libs
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(NETCDF REQUIRED IMPORTED_TARGET "netcdf-fortran")
+
 set(CABLE_INTEL_Fortran_FLAGS -fp-model precise)
 set(CABLE_INTEL_Fortran_FLAGS_DEBUG -O0 -g -traceback -fpe0)
 set(CABLE_INTEL_Fortran_FLAGS_RELEASE -O2)
 
+set(CABLE_EXE_NAME "$<IF:$<BOOL:${CABLE_MPI}>,cable-mpi,cable>")
+
+set(
+    CABLE_SRCS_SERIAL
+    src/offline/cable_driver.F90
+)
+set(
+    CABLE_SRCS_MPI
+    src/offline/cable_mpidrv.F90
+    src/offline/cable_mpicommon.F90
+    src/offline/cable_mpimaster.F90
+    src/offline/cable_mpiworker.F90
+    src/science/pop/pop_mpi.F90
+)
 set(
     CABLE_SRCS_COMMON
     src/science/casa-cnp/bgcdriver.F90
@@ -122,30 +140,11 @@ set(
     src/science/roughness/roughnessHGT_effLAI_cbl.F90
     src/offline/spincasacnp.F90
 )
-
-find_package(PkgConfig REQUIRED)
-
-pkg_check_modules(NETCDF REQUIRED IMPORTED_TARGET "netcdf-fortran")
-
-if(CABLE_MPI)
-    set(
-        CABLE_SRCS
-        src/offline/cable_mpidrv.F90
-        src/offline/cable_mpicommon.F90
-        src/offline/cable_mpimaster.F90
-        src/offline/cable_mpiworker.F90
-        src/science/pop/pop_mpi.F90
-        ${CABLE_SRCS_COMMON}
-    )
-    set(CABLE_EXE_NAME cable-mpi)
-else()
-    set(
-        CABLE_SRCS
-        src/offline/cable_driver.F90
-        ${CABLE_SRCS_COMMON}
-    )
-    set(CABLE_EXE_NAME cable)
-endif()
+set(
+    CABLE_SRCS
+    "$<IF:$<BOOL:${CABLE_MPI}>,${CABLE_SRCS_MPI},${CABLE_SRCS_SERIAL}>"
+    ${CABLE_SRCS_COMMON}
+)
 
 add_executable(cable ${CABLE_SRCS})
 
@@ -161,7 +160,6 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES "Intel")
     )
 endif()
 
-# third party libs
 target_link_libraries(
     cable
     PkgConfig::NETCDF