question on Multiple level macro expansion

[Qing Zhao]

Hi, 

GCC cannot compile the following small testing case:

[qinzhao@localhost]$ cat t1.c
extern void boo (void *addr);

#define  foo(addr) \
  boo (addr)

#define bar(instr, addr)  \
  (instr) (addr)

void check (void *addr)
{
  bar(foo, addr);
}

[qinzhao@localhost]$ sh t
/home/qinzhao/Install/latest/bin/gcc -O -S t1.c
t1.c: In function ‘check’:
t1.c:11:7: error: ‘foo’ undeclared (first use in this function); did you mean 
‘boo’?
   11 |   bar(foo, addr);
      |       ^~~
t1.c:7:4: note: in definition of macro ‘bar’
    7 |   (instr) (addr)
      |    ^~~~~
t1.c:11:7: note: each undeclared identifier is reported only once for each 
function it appears in
   11 |   bar(foo, addr);
      |       ^~~
t1.c:7:4: note: in definition of macro ‘bar’
    7 |   (instr) (addr)
      |    ^~~~~

However, if I delete the parantheses from the macro bar as following:

#define bar(instr, addr)  \
  instr (addr)

The compilation succeed. 

also icc can successfully compile the original small testing case. 

My question is:

is this a bug for GCC? 
or this is a coding error?

thanks a lot for your help.

Qing