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#include <stdio.h>
 
void func1(void);
void func2(void);
 
//#define func1(...)    func1##__VA_ARGS__()
//#define func2(...)    func2##__VA_ARGS__()
//#define func1    func1void
//#define func2    func2void
#define func1(x)    func1void
#define func2(...)    func2##__VA_ARGS__()
 
// --- 既存ソース部分。実際には#includeで取り込む ---
static void test(void)
{
    func1(10);
    func2();
}
 
void func1(int a)
{
    printf("func1()\n");
}
void func2(void)
{
    printf("func2()\n");
}
// --- 既存ソース終わり ---
 
#undef func1
#undef func2
 
void func1(int a)
{
    printf("func1_stub()\n");
}
void func2(void)
{
    printf("func2_stub()\n");
}
 
int main()
{
    test();
    return 0;
}

prog.c: In function 'test':
prog.c:10:21: error: 'func1void' undeclared (first use in this function)
 #define func1(x)    func1void
                     ^
prog.c:16:5: note: in expansion of macro 'func1'
     func1(10);
     ^
prog.c:10:21: note: each undeclared identifier is reported only once for each function it appears in
 #define func1(x)    func1void
                     ^
prog.c:16:5: note: in expansion of macro 'func1'
     func1(10);
     ^
prog.c: At top level:
prog.c:21:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
prog.c:33:6: error: conflicting types for 'func1'
 void func1(int a)
      ^
prog.c:3:6: note: previous declaration of 'func1' was here
 void func1(void);
      ^

Standard output is empty