mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
f69f887092
Building string/tst-endian.c with gcc 6 produces an build warning/error on s390 (big endian machine):
gcc tst-endian.c -c -std=gnu11 -fgnu89-inline -O2 or -O3 ...
tst-endian.c: In function ‘do_test’:
tst-endian.c:16:30: error: self-comparison always evaluates to false [-Werror=tautological-compare]
if (htobe16 (be16toh (i)) != i)
^~
...
See definitions of htobexx, bexxtoh in string/endian.h:
...
This patch silences these warnings with DIAG_* macros if build with gcc 6
and newer.
The same warnings occur on little endian machines with the
"htoleXX (leXXtoh (i)) != i" if-statements.
ChangeLog:
* string/tst-endian.c: Include <libc-internal.h>.
(do_test): Ignore tautological-compare warnings around
"htobeXX (beXXtoh (i)) != i" and
"htoleXX (leXXtoh (i)) != i" if-statements.
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
#include <byteswap.h>
|
|
#include <endian.h>
|
|
#include <inttypes.h>
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <libc-internal.h>
|
|
|
|
#if __GNUC_PREREQ (6, 0)
|
|
/* GCC 6.0 warns on big endian systems about:
|
|
htobeXX (beXXtoh (i)) != i
|
|
warning: self-comparison always evaluates to false [-Wtautological-compare]
|
|
because htobeXX(x) and beXXtoh(x) is defined to (x)
|
|
in string/endian.h on big endian systems.
|
|
The same applies to htoleXX/leXXtoh on little endian systems. */
|
|
# define DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE() \
|
|
DIAG_IGNORE_NEEDS_COMMENT (6, "-Wtautological-compare")
|
|
#else
|
|
# define DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE()
|
|
#endif
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
int result = 0;
|
|
|
|
for (uint64_t i = 0; i < (~UINT64_C (0)) >> 2; i = (i << 1) + 3)
|
|
{
|
|
if (i < UINT64_C (65536))
|
|
{
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
|
|
if (htobe16 (be16toh (i)) != i)
|
|
{
|
|
printf ("htobe16 (be16toh (%" PRIx64 ")) == %" PRIx16 "\n",
|
|
i, (uint16_t) htobe16 (be16toh (i)));
|
|
result = 1;
|
|
}
|
|
if (htole16 (le16toh (i)) != i)
|
|
{
|
|
printf ("htole16 (le16toh (%" PRIx64 ")) == %" PRIx16 "\n",
|
|
i, (uint16_t) htole16 (le16toh (i)));
|
|
result = 1;
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
|
|
uint16_t n[2];
|
|
n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_16 (i);
|
|
n[__BYTE_ORDER == __BIG_ENDIAN] = i;
|
|
if (htole16 (i) != n[0])
|
|
{
|
|
printf ("htole16 (%" PRIx64 ") == %" PRIx16 " != %" PRIx16 "\n",
|
|
i, (uint16_t) htole16 (i), n[0]);
|
|
result = 1;
|
|
}
|
|
if (htobe16 (i) != n[1])
|
|
{
|
|
printf ("htobe16 (%" PRIx64 ") == %" PRIx16 " != %" PRIx16 "\n",
|
|
i, (uint16_t) htobe16 (i), n[1]);
|
|
result = 1;
|
|
}
|
|
}
|
|
|
|
if (i < UINT64_C (4294967296))
|
|
{
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
|
|
if (htobe32 (be32toh (i)) != i)
|
|
{
|
|
printf ("htobe32 (be32toh (%" PRIx64 ")) == %" PRIx32 "\n",
|
|
i, (uint32_t) htobe32 (be32toh (i)));
|
|
result = 1;
|
|
}
|
|
if (htole32 (le32toh (i)) != i)
|
|
{
|
|
printf ("htole32 (le32toh (%" PRIx64 ")) == %" PRIx32 "\n",
|
|
i, (uint32_t) htole32 (le32toh (i)));
|
|
result = 1;
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
|
|
uint32_t n[2];
|
|
n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_32 (i);
|
|
n[__BYTE_ORDER == __BIG_ENDIAN] = i;
|
|
if (htole32 (i) != n[0])
|
|
{
|
|
printf ("htole32 (%" PRIx64 ") == %" PRIx32 " != %" PRIx32 "\n",
|
|
i, (uint32_t) htole32 (i), n[0]);
|
|
result = 1;
|
|
}
|
|
if (htobe32 (i) != n[1])
|
|
{
|
|
printf ("htobe32 (%" PRIx64 ") == %" PRIx32 " != %" PRIx32 "\n",
|
|
i, (uint32_t) htobe32 (i), n[1]);
|
|
result = 1;
|
|
}
|
|
}
|
|
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
|
|
if (htobe64 (be64toh (i)) != i)
|
|
{
|
|
printf ("htobe64 (be64toh (%" PRIx64 ")) == %" PRIx64 "\n",
|
|
i, htobe64 (be64toh (i)));
|
|
result = 1;
|
|
}
|
|
if (htole64 (le64toh (i)) != i)
|
|
{
|
|
printf ("htole64 (le64toh (%" PRIx64 ")) == %" PRIx64 "\n",
|
|
i, htole64 (le64toh (i)));
|
|
result = 1;
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
|
|
uint64_t n[2];
|
|
n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_64 (i);
|
|
n[__BYTE_ORDER == __BIG_ENDIAN] = i;
|
|
if (htole64 (i) != n[0])
|
|
{
|
|
printf ("htole64 (%" PRIx64 ") == %" PRIx64 " != %" PRIx64 "\n",
|
|
i, htole64 (i), n[0]);
|
|
result = 1;
|
|
}
|
|
if (htobe64 (i) != n[1])
|
|
{
|
|
printf ("htobe64 (%" PRIx64 ") == %" PRIx64 " != %" PRIx64 "\n",
|
|
i, htobe64 (i), n[1]);
|
|
result = 1;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#define TEST_FUNCTION do_test ()
|
|
#include "../test-skeleton.c"
|