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| author | Pádraig Brady <P@draigBrady.com> | 2014-12-03 21:06:11 +0000 |
|---|---|---|
| committer | Pádraig Brady <P@draigBrady.com> | 2014-12-03 23:38:36 +0000 |
| commit | 5760532a2dcbad3569928f56a1d5d60d7282087c (patch) | |
| tree | ca8b1343a13f3c53965bbbc302df4dcfb038cfc4 /gl/lib | |
| parent | a6d979299717e3769debfa5d295cb2934683077b (diff) | |
| download | coreutils-5760532a2dcbad3569928f56a1d5d60d7282087c.tar.xz | |
maint: avoid -fsanitize=undefined warning in rand-isaac
* gl/lib/rand-isaac.c (isaac_refill): readisaac() purposefully passes
unaligned pointers to avoid memory copies. This is only done on
platforms where this is defined, so avoid the associated
runtime warning generated with -fsanitize=undefined, which is:
lib/rand-isaac.c:125:182: runtime error: store to misaligned address
0x63100003d7fd for type 'isaac_word', which requires 8 byte alignment
0x63100003d7fd: note: pointer points here
47 ce ed a4 be be be 00 00 00 00 00 00 00 00 ...
^
Diffstat (limited to 'gl/lib')
| -rw-r--r-- | gl/lib/rand-isaac.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/gl/lib/rand-isaac.c b/gl/lib/rand-isaac.c index c03242f66..3462b6d4b 100644 --- a/gl/lib/rand-isaac.c +++ b/gl/lib/rand-isaac.c @@ -35,6 +35,18 @@ #include "rand-isaac.h" #include <limits.h> +#include <string.h> + +/* If the platform supports unaligned access, + then don't have -fsanitize=undefined warn about it. */ +#undef ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED +#if !_STRING_ARCH_unaligned \ + || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9) +# define ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED /* empty */ +#else +# define ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED \ + __attribute__ ((__no_sanitize_undefined__)) +#endif /* The minimum of two sizes A and B. */ static inline size_t @@ -81,7 +93,7 @@ ind (isaac_word const *m, isaac_word x) } /* Use and update *S to generate random data to fill RESULT. */ -void +void ATTRIBUTE_NO_WARN_SANITIZE_UNDEFINED isaac_refill (struct isaac_state *s, isaac_word result[ISAAC_WORDS]) { /* Caches of S->a and S->b. */ |