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authorStefan Liebler <stli@linux.vnet.ibm.com>2016-01-25 12:44:46 +0100
committerStefan Liebler <stli@linux.vnet.ibm.com>2016-01-25 12:44:46 +0100
commitf69f887092914f6e1abcc2d622e4f5e56a6e1645 (patch)
tree059ff394b3baaf5826240aff0afa6305a4dcb158 /string
parentc34ae92056f29f0843274c0cb4ea8c301f4b13e8 (diff)
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S390: Fix build failure in test string/tst-endian.c with gcc 6.
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.
Diffstat (limited to 'string')
-rw-r--r--string/tst-endian.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/string/tst-endian.c b/string/tst-endian.c
index 8684bb232b..7d39131a68 100644
--- a/string/tst-endian.c
+++ b/string/tst-endian.c
@@ -3,6 +3,20 @@
#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)
@@ -13,6 +27,8 @@ do_test (void)
{
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",
@@ -25,6 +41,7 @@ do_test (void)
i, (uint16_t) htole16 (le16toh (i)));
result = 1;
}
+ DIAG_POP_NEEDS_COMMENT;
uint16_t n[2];
n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_16 (i);
@@ -45,6 +62,8 @@ do_test (void)
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",
@@ -57,6 +76,7 @@ do_test (void)
i, (uint32_t) htole32 (le32toh (i)));
result = 1;
}
+ DIAG_POP_NEEDS_COMMENT;
uint32_t n[2];
n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_32 (i);
@@ -75,6 +95,8 @@ do_test (void)
}
}
+ DIAG_PUSH_NEEDS_COMMENT;
+ DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
if (htobe64 (be64toh (i)) != i)
{
printf ("htobe64 (be64toh (%" PRIx64 ")) == %" PRIx64 "\n",
@@ -87,6 +109,7 @@ do_test (void)
i, htole64 (le64toh (i)));
result = 1;
}
+ DIAG_POP_NEEDS_COMMENT;
uint64_t n[2];
n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_64 (i);