[Bug c/46045] incorrect code generated if redecalring local variable in do-while(0)

[mbuilov at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46045

--- Comment #3 from Michael Builov <mbuilov at gmail dot com> 2010-10-17 
15:51:16 UTC ---
Just a warning with -Wextra, but no warnings with -Wall -pedantic.

I found a bug with this code:

struct A {


#definer dump(_a_) \
do { \
  Struct A *a = _a_; \
  printf("%d, %d\n", a->k, a->m); \
} while (0)

Struct *b, a;
dump(b); /* fine */
dump(a); /* crash */