gcc/testsuite/gcc.dg/c11-typedef-1.c

   1 /* Test typedef redeclaration in C11.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c11 -pedantic-errors" } */
   4
   5 /* C11 permits typedefs to be redeclared to the same type, but not to
   6    different-but-compatible types, and not when the type is variably
   7    modified.  */
   8
   9 #include <limits.h>
  10
  11 typedef int TI;
  12 typedef int TI2;
  13 typedef TI2 TI;
  14 typedef TI TI2;
  15
  16 enum e { E1 = 0, E2 = INT_MAX, E3 = -1 };
  17 typedef enum e TE;
  18 typedef enum e TE; /* { dg-message "previous declaration" } */
  19 typedef int TE; /* { dg-error "with different type" } */
  20
  21 struct s;
  22 typedef struct s TS;
  23 struct s { int i; };
  24 typedef struct s TS;
  25
  26 typedef int IA[];
  27 typedef TI2 IA[]; /* { dg-message "previous declaration" } */
  28 typedef int A2[2];
  29 typedef TI A2[2]; /* { dg-message "previous declaration" } */
  30 typedef IA A2; /* { dg-error "with different type" } */
  31 typedef int A3[3];
  32 typedef A3 IA; /* { dg-error "with different type" } */
  33
  34 typedef void F(int);
  35 typedef void F(TI); /* { dg-message "previous declaration" } */
  36 typedef void F(enum e); /* { dg-error "with different type" } */
  37
  38 typedef int G(void);
  39 typedef TI G(void); /* { dg-message "previous declaration" } */
  40 typedef enum e G(void); /* { dg-error "with different type" } */
  41
  42 typedef int *P;
  43 typedef TI *P; /* { dg-message "previous declaration" } */
  44 typedef enum e *P; /* { dg-error "with different type" } */
  45
  46 typedef void F2();
  47 typedef void F2(); /* { dg-message "previous declaration" } */
  48 typedef void F2(int); /* { dg-error "with different type" } */
  49
  50 void
  51 f (void)
  52 {
  53   int a = 1;
  54   int b = 2;
  55   typedef void FN(int (*p)[a]);
  56   typedef void FN(int (*p)[b]);
  57   typedef void FN(int (*p)[*]); /* { dg-message "previous declaration" } */
  58   typedef void FN(int (*p)[1]); /* { dg-error "with different type" } */
  59   typedef void FN2(int (*p)[a]);
  60   typedef void FN2(int (*p)[b]);
  61   typedef void FN2(int (*p)[*]); /* { dg-message "previous declaration" } */
  62   typedef void FN2(int (*p)[]); /* { dg-error "with different type" } */
  63   typedef int AV[a]; /* { dg-message "previous declaration" } */
  64   typedef int AV[b-1]; /* { dg-error "redefinition" } */
  65   typedef int AAa[a]; /* { dg-message "previous declaration" } */
  66   typedef int AAb[b-1];
  67   typedef AAa *VF(void); /* { dg-message "previous declaration" } */
  68   typedef AAb *VF(void); /* { dg-error "redefinition" } */
  69   typedef AAa AAa; /* { dg-error "redefinition" } */
  70 }