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/* { dg-do compile } */

/* { dg-options "-O2" } */

extern __SIZE_TYPE__ strlen (__const char *__s)

     __attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1)));

extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)

     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));

extern char *getenv (__const char *__name) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));

extern int access (__const char *__name, int __type) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));

extern void * xmalloc (__SIZE_TYPE__) __attribute__ ((__malloc__));

static __inline__ const char *

try (const char *dir, const char *base)

{

  if (base != 0)

    return base;

  if (dir != 0

      && access (dir, 4 | 2 | 1) == 0)

    return dir;

  return 0;

}

static const char tmp[] = { '/', 't', 'm', 'p', 0 };

static const char usrtmp[] =

{ '/', 'u', 's', 'r', '/', 't', 'm', 'p', 0 };

static const char vartmp[] =

{ '/', 'v', 'a', 'r', '/', 't', 'm', 'p', 0 };

static char *memoized_tmpdir;

char *

choose_tmpdir (void)

{

  const char *base = 0;

  char *tmpdir;

  unsigned int len;

  if (memoized_tmpdir)

    return memoized_tmpdir;

  base = try (getenv ("TMPDIR"), base);

  base = try (getenv ("TMP"), base);

  base = try (getenv ("TEMP"), base);

  base = try ("/tmp", base);

  base = try (vartmp, base);

  base = try (usrtmp, base);

  base = try (tmp, base);

  if (base == 0)

    base = ".";

  len = strlen (base);

  tmpdir = xmalloc (len + 2);

  strcpy (tmpdir, base);

  /* Alias analysis was associating read-only memory tags to pointers

     that are not read-only.  We would then not issue any V_MAY_DEF in

     this store.  */

  tmpdir[len] = '/';

  tmpdir[len+1] = '\0';

  memoized_tmpdir = tmpdir;

  return tmpdir;

}