gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/pr20933.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 extern __SIZE_TYPE__ strlen (__const char *__s)
   5      __attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1)));
   6 extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
   7      __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
   8 extern char *getenv (__const char *__name) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
   9 extern int access (__const char *__name, int __type) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
  10 extern void * xmalloc (__SIZE_TYPE__) __attribute__ ((__malloc__));
  11
  12 static __inline__ const char *
  13 try (const char *dir, const char *base)
  14 {
  15   if (base != 0)
  16     return base;
  17   if (dir != 0
  18       && access (dir, 4 | 2 | 1) == 0)
  19     return dir;
  20   return 0;
  21 }
  22
  23 static const char tmp[] = { '/', 't', 'm', 'p', 0 };
  24 static const char usrtmp[] =
  25 { '/', 'u', 's', 'r', '/', 't', 'm', 'p', 0 };
  26 static const char vartmp[] =
  27 { '/', 'v', 'a', 'r', '/', 't', 'm', 'p', 0 };
  28
  29 static char *memoized_tmpdir;
  30 char *
  31 choose_tmpdir (void)
  32 {
  33   const char *base = 0;
  34   char *tmpdir;
  35   unsigned int len;
  36
  37   if (memoized_tmpdir)
  38     return memoized_tmpdir;
  39
  40   base = try (getenv ("TMPDIR"), base);
  41   base = try (getenv ("TMP"), base);
  42   base = try (getenv ("TEMP"), base);
  43
  44
  45   base = try ("/tmp", base);
  46
  47
  48
  49   base = try (vartmp, base);
  50   base = try (usrtmp, base);
  51   base = try (tmp, base);
  52
  53
  54   if (base == 0)
  55     base = ".";
  56
  57
  58
  59   len = strlen (base);
  60   tmpdir = xmalloc (len + 2);
  61   strcpy (tmpdir, base);
  62   /* Alias analysis was associating read-only memory tags to pointers
  63      that are not read-only.  We would then not issue any V_MAY_DEF in
  64      this store.  */
  65   tmpdir[len] = '/';
  66   tmpdir[len+1] = '\0';
  67
  68   memoized_tmpdir = tmpdir;
  69   return tmpdir;
  70 }