how to try and catch for preprocessor directives like “#include”

Question

is there a method to try and catch for an #include directive since #include is processor directives and try catch method is done during compilation it wont work is there any workaround for it? I need to check if a file can be included else include another file.

Answer 1

__has_include function along with using #if and #elif would do that.

#if defined __has_include
#  if __has_include (<stdatomic.h>)
#    include <stdatomic.h>
#  endif
#endif

Source: https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005finclude.html