michaelbartnett · July 12, 2016 04:23
diff --git a/foo_base.c b/foo_base.c
 void foo_base()
 {
   printf("fool\n");
 }

 #define FooFunction foo_base
diff --git a/foo_extended.c b/foo_extended.c
 #include "foo_base.c"

 #ifndef FooFunction
 #error why is there no FooFunction
 #endif

 void foo_extended()
 {
    printf("i pity the ");
    FooFunction();
 }


 #undef FooFunction
 #define FooFunction foo_extended()
diff --git a/user1.c b/user1.c
 #inlude "foo_base.c"

 void doathing()
 {
    printf("call FooFunction\n");
    FooFunction();
 }
diff --git a/user2.c b/user2.c
 #include "foo_base.c" // redundant, assume include guards
 #include "foo_extended.c"

 void doathing2()
 {
    printf("call FooFunction\n");
    FooFunction();
 }
	#include "foo_base.c"

	#ifndef FooFunction
	#error why is there no FooFunction
	#endif

	void foo_extended()
	{
	printf("i pity the ");
	FooFunction();
	}


	#undef FooFunction
	#define FooFunction foo_extended()
	#include "foo_base.c" // redundant, assume include guards
	#include "foo_extended.c"

	void doathing2()
	{
	printf("call FooFunction\n");
	FooFunction();
	}