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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>
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#include <endian.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <libc-internal.h>
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#if __GNUC_PREREQ (6, 0)
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/* GCC 6.0 warns on big endian systems about:
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htobeXX (beXXtoh (i)) != i
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warning: self-comparison always evaluates to false [-Wtautological-compare]
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because htobeXX(x) and beXXtoh(x) is defined to (x)
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in string/endian.h on big endian systems.
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The same applies to htoleXX/leXXtoh on little endian systems. */
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# define DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE() \
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DIAG_IGNORE_NEEDS_COMMENT (6, "-Wtautological-compare")
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#else
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# define DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE()
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#endif
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static int
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do_test (void)
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{
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int result = 0;
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for (uint64_t i = 0; i < (~UINT64_C (0)) >> 2; i = (i << 1) + 3)
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{
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if (i < UINT64_C (65536))
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{
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
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if (htobe16 (be16toh (i)) != i)
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{
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printf ("htobe16 (be16toh (%" PRIx64 ")) == %" PRIx16 "\n",
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i, (uint16_t) htobe16 (be16toh (i)));
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result = 1;
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}
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if (htole16 (le16toh (i)) != i)
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{
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printf ("htole16 (le16toh (%" PRIx64 ")) == %" PRIx16 "\n",
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i, (uint16_t) htole16 (le16toh (i)));
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result = 1;
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}
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DIAG_POP_NEEDS_COMMENT;
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uint16_t n[2];
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n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_16 (i);
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n[__BYTE_ORDER == __BIG_ENDIAN] = i;
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if (htole16 (i) != n[0])
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{
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printf ("htole16 (%" PRIx64 ") == %" PRIx16 " != %" PRIx16 "\n",
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i, (uint16_t) htole16 (i), n[0]);
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result = 1;
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}
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if (htobe16 (i) != n[1])
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{
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printf ("htobe16 (%" PRIx64 ") == %" PRIx16 " != %" PRIx16 "\n",
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i, (uint16_t) htobe16 (i), n[1]);
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result = 1;
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}
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}
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if (i < UINT64_C (4294967296))
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{
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
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if (htobe32 (be32toh (i)) != i)
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{
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printf ("htobe32 (be32toh (%" PRIx64 ")) == %" PRIx32 "\n",
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i, (uint32_t) htobe32 (be32toh (i)));
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result = 1;
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}
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if (htole32 (le32toh (i)) != i)
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{
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printf ("htole32 (le32toh (%" PRIx64 ")) == %" PRIx32 "\n",
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i, (uint32_t) htole32 (le32toh (i)));
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result = 1;
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}
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DIAG_POP_NEEDS_COMMENT;
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uint32_t n[2];
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n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_32 (i);
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n[__BYTE_ORDER == __BIG_ENDIAN] = i;
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if (htole32 (i) != n[0])
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{
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printf ("htole32 (%" PRIx64 ") == %" PRIx32 " != %" PRIx32 "\n",
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i, (uint32_t) htole32 (i), n[0]);
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result = 1;
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}
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if (htobe32 (i) != n[1])
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{
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printf ("htobe32 (%" PRIx64 ") == %" PRIx32 " != %" PRIx32 "\n",
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i, (uint32_t) htobe32 (i), n[1]);
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result = 1;
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}
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}
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
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if (htobe64 (be64toh (i)) != i)
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{
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printf ("htobe64 (be64toh (%" PRIx64 ")) == %" PRIx64 "\n",
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i, htobe64 (be64toh (i)));
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result = 1;
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}
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if (htole64 (le64toh (i)) != i)
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{
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printf ("htole64 (le64toh (%" PRIx64 ")) == %" PRIx64 "\n",
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i, htole64 (le64toh (i)));
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result = 1;
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}
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DIAG_POP_NEEDS_COMMENT;
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uint64_t n[2];
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n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_64 (i);
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n[__BYTE_ORDER == __BIG_ENDIAN] = i;
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if (htole64 (i) != n[0])
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{
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printf ("htole64 (%" PRIx64 ") == %" PRIx64 " != %" PRIx64 "\n",
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i, htole64 (i), n[0]);
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result = 1;
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}
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if (htobe64 (i) != n[1])
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{
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printf ("htobe64 (%" PRIx64 ") == %" PRIx64 " != %" PRIx64 "\n",
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i, htobe64 (i), n[1]);
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result = 1;
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}
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}
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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