Some ideas I had for simple debug print macros I had where you don't have to specify the type or fmt string. Just a single header and a single interface. Plus in one of a number of colors. When done with debugging just CTRL-F and delete.

To add your own or library types just add a line like

custom_type *: custom_type_to_debug_string, \

in GET_CREATE_DEBUG_STRING_FUNC Macro

where custom_type_to_debug_string is a function with the following signature:

char * custom_type_to_debug_string(void * obj_of_custom_type_v)

(you can cast obj_of_custom_type_v to custom_type inside the function)
that takes a pointer to the custom type as void * and returns a dynamically allocated string with the debug message representing the object of the custom type.

This works on gcc>4.9 (due to use of designated initializers) and llvm/clang >3.3 (maybe earlier but I tested it with 3.3). I think microsofts c compiler may have added designated initializers and _Generic but I'm not sure and haven't had the chance to test it yet. Also U used typeof which is a gcc/llvm only extension (I'll try to replace it later). Doesn't seem to work with a c++ compiler, might be cool to get compiling for both languages at the same time.

I may make non backwards compatible changes but it probably doesn't matter as this is designed as a single dropin header (debug_print.h). the API is DEBUG_PRINT(expr, ...) where ... is an optional comma seperated list of options in the format .option=value, (where .option is one of the fields in debug_print_options) Specifically colorscheme, filestream and group. Colorsheme lets you overide color, filestream the output stream(defaults to stderr), and group the group index(defaults to 0/the first group in the array) in debug_print_group_options_list.

The group associated with the DEBUG_PRINT_MESSAGE or DEBUG_PRINT controls the the default color and output stream if not overriden as well as whether or not the macro is disabled. This is useful for disabling/enabling groups of macros at once. If you do this I'd reccomend #define ing the group indexes.

The default/0 group is set to stderr, blue and not disabled by default.

example:

DEBUG_PRINT(o, .colorscheme=FORE_GREEN, .filestream=stdout);

prints in Green to stdout

File: example.c | Line: 30 | Func: main
o ->  debug_print_options:
colorscheme:FORE_BLUE
filestream: ptr to filestream:(nil)
group index:0

For more examples see example.c