gcc/testsuite/gcc.dg/Wconversion-integer-no-sign.c

   1 /* Test for diagnostics for implicit conversions between integer types
   2    These tests come from gcc/testsuite/gcc.dg/overflow-warn-2.c  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=c99 -fsigned-char -Wconversion -Wno-sign-conversion" } */
   6
   7 #include <limits.h>
   8
   9 void fsc (signed char sc);
  10 void fuc (unsigned char uc);
  11 unsigned fui (unsigned int  ui);
  12 void fsi (signed int ui);
  13
  14 void h (int x)
  15 {
  16   unsigned int ui = 3;
  17   int   si = 3;
  18   unsigned char uc = 3;
  19   signed char   sc = 3;
  20
  21   uc = ui; /* { dg-warning "conversion" } */
  22   uc = si; /* { dg-warning "conversion" } */
  23   sc = ui; /* { dg-warning "conversion" } */
  24   sc = si; /* { dg-warning "conversion" } */
  25   fuc (ui); /* { dg-warning "conversion" } */
  26   fuc (si); /* { dg-warning "conversion" } */
  27   fsc (ui); /* { dg-warning "conversion" } */
  28   fsc (si); /* { dg-warning "conversion" } */
  29
  30   fsi (si);
  31   fui (ui);
  32   fsi (uc);
  33   si = uc;
  34   fui (uc);
  35   ui = uc;
  36   fui ('A');
  37   ui = 'A';
  38   fsi ('A');
  39   si = 'A';
  40   fuc ('A');
  41   uc = 'A';
  42
  43   uc = x ? 1U : -1; /* { dg-warning "conversion" } */
  44   uc = x ? SCHAR_MIN : 1U; /* { dg-warning "conversion" } */
  45   uc = x ? 1 : -1; /* Warned by -Wsign-conversion.  */
  46   uc = x ? SCHAR_MIN : 1; /* Warned by -Wsign-conversion.  */
  47   ui = x ? 1U : -1; /* Warned by -Wsign-conversion.  */
  48   ui = x ? INT_MIN : 1U; /* Warned by -Wsign-conversion.  */
  49   ui = ui ? SCHAR_MIN : 1U; /* Warned by -Wsign-conversion.  */
  50   ui = 1U * -1; /* Warned by -Wsign-conversion.  */
  51   ui = ui + INT_MIN; /* Warned by -Wsign-conversion.  */
  52   ui = x ? 1 : -1; /* Warned by -Wsign-conversion.  */
  53   ui = ui ? SCHAR_MIN : 1; /* Warned by -Wsign-conversion.  */
  54
  55   fuc (-1); /* Warned by -Wsign-conversion.  */
  56   uc = -1; /* Warned by -Wsign-conversion.  */
  57   fui (-1); /* Warned by -Wsign-conversion.  */
  58   ui = -1; /* Warned by -Wsign-conversion.  */
  59   fuc ('\xa0'); /* Warned by -Wsign-conversion.  */
  60   uc = '\xa0'; /* Warned by -Wsign-conversion.  */
  61   fui ('\xa0'); /* Warned by -Wsign-conversion.  */
  62   ui = '\xa0';  /* Warned by -Wsign-conversion.  */
  63   fsi ((unsigned) INT_MAX + 1U); /* Warned by -Wsign-conversion.  */
  64   si = (unsigned) INT_MAX + 1U;  /* Warned by -Wsign-conversion.  */
  65
  66
  67   fsi (UINT_MAX - 1);  /* Warned by -Wsign-conversion.  */
  68   si = UINT_MAX - 1;   /* Warned by -Wsign-conversion.  */
  69   fsi (UINT_MAX - 1U); /* Warned by -Wsign-conversion.  */
  70   si = UINT_MAX - 1U;  /* Warned by -Wsign-conversion.  */
  71   fsi (UINT_MAX/3U);
  72   si = UINT_MAX/3U;
  73   fsi (UINT_MAX/3);
  74   si = UINT_MAX/3;
  75   fui (UINT_MAX - 1);
  76   ui = UINT_MAX - 1;
  77
  78   uc = (unsigned char) -1;
  79   ui = -1 * (1 * -1);
  80   ui = (unsigned) -1;
  81
  82   fsc (uc); /* Warned by -Wsign-conversion.  */
  83   sc = uc;  /* Warned by -Wsign-conversion.  */
  84   fuc (sc); /* Warned by -Wsign-conversion.  */
  85   uc = sc;  /* Warned by -Wsign-conversion.  */
  86   fsi (ui); /* Warned by -Wsign-conversion.  */
  87   si = ui;  /* Warned by -Wsign-conversion.  */
  88   fui (si); /* Warned by -Wsign-conversion.  */
  89   ui = si;  /* Warned by -Wsign-conversion.  */
  90   fui (sc); /* Warned by -Wsign-conversion.  */
  91   ui = sc;  /* Warned by -Wsign-conversion.  */
  92 }
  93
  94 unsigned fui (unsigned a) { return a + -1; } /* Warned by -Wsign-conversion.  */
  95
  96