gcc/testsuite/c-c++-common/Wmultistatement-macros-9.c

   1 /* PR c/80116 */
   2 /* { dg-options "-Wmultistatement-macros" } */
   3 /* { dg-do compile } */
   4
   5 #define SWAP(x, y) \
   6   tmp = x; /* { dg-warning "macro expands to multiple statements" } */ \
   7   x = y; \
   8   y = tmp
   9
  10 #define M1      \
  11   while (x) /* { dg-message "not guarded by this 'while' claus" } */ \
  12     SWAP (x, y) /* { dg-message "in expansion of macro .SWAP." } */
  13
  14 #define M2      \
  15   while (x)     \
  16     x++
  17
  18 #define M3      \
  19   while (x)     \
  20     x++;;
  21
  22 #define M4      \
  23   while (x) /* { dg-message "not guarded by this 'while' claus" } */ \
  24 L1:             \
  25     SWAP (x, y) /* { dg-message "in expansion of macro .SWAP." } */
  26
  27 #define INC     \
  28   x++;;
  29
  30 int x, y, tmp;
  31
  32 void
  33 fn0 (void)
  34 {
  35   while (x) /* { dg-message "not guarded by this 'while' claus" } */
  36     SWAP (x, y); /* { dg-message "in expansion of macro .SWAP." } */
  37
  38   while (x) /* { dg-message "not guarded by this 'while' claus" } */
  39 L:
  40     SWAP (x, y); /* { dg-message "in expansion of macro .SWAP." } */
  41   goto L;
  42 }
  43
  44 void
  45 fn1 (void)
  46 {
  47   M1; /* { dg-message "in expansion of macro .M1." } */
  48   M2;
  49   M3;
  50   M4; /* { dg-message "in expansion of macro .M4." } */
  51   goto L1;
  52 }
  53
  54 void
  55 fn2 (void)
  56 {
  57   while (x)
  58     INC
  59
  60   while (x)
  61     ({ x = 10; x++; });
  62 }