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algorithms.checksums: work around GCC 4.4 bug by disabling CLMUL

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Also disabling this code path for 4.5; 4.6 was tested iirc.
This commit is contained in:
Marian Beermann 2017-06-05 14:21:26 +02:00
parent 50bcd7843d
commit 909f099b1a
1 changed files with 8 additions and 0 deletions
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8
src/borg/algorithms/crc32_dispatch.c
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@ -3,6 +3,12 @@
#include "crc32_slice_by_8.c"
#ifdef __GNUC__
/*
* GCC 4.4(.7) has a bug that causes it to recurse infinitely if an unknown option
* is pushed onto the options stack. GCC 4.5 was not tested, so is excluded as well.
* GCC 4.6 is known good.
*/
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
/*
* clang also has or had GCC bug #56298 explained below, but doesn't support
* target attributes or the options stack. So we disable this faster code path for clang.
@ -66,6 +72,7 @@
#endif /* if __x86_64__ */
#endif /* ifndef __OpenBSD__ */
#endif /* ifndef __clang__ */
#endif /* __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) */
#endif /* ifdef __GNUC__ */
#ifdef FOLDING_CRC
@ -75,6 +82,7 @@
static uint32_t
crc32_clmul(const uint8_t *src, long len, uint32_t initial_crc)
{
(void)src; (void)len; (void)initial_crc;
assert(0);
return 0;
}