need linker language

Author: scivision

src/CMakeLists.txt

@@ -27,6 +27,7 @@ add_test(NAME C_Fortran_error
 
 add_executable(c_fortran_struct c/struct_main.c)
 target_link_libraries(c_fortran_struct PRIVATE struct_fortran)
+set_target_properties(c_fortran_struct PROPERTIES LINKER_LANGUAGE C)
 add_test(NAME C_Fortran_struct COMMAND $<TARGET_FILE:c_fortran_struct>)
 
 # -- C++ calling Fortran
@@ -44,6 +45,7 @@ add_test(NAME C++_Fortran_error
 
 add_executable(cxx_fortran_struct cxx/struct_main.cxx)
 target_link_libraries(cxx_fortran_struct PRIVATE struct_fortran)
+set_target_properties(cxx_fortran_struct PROPERTIES LINKER_LANGUAGE CXX)
 add_test(NAME C++_Fortran_struct COMMAND $<TARGET_FILE:cxx_fortran_struct>)
 
 # -- test wrapup