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On 12/05/2014 04:16 AM, Schwarz, Konrad wrote: >> while the glibc shim calls merely >> 'compar(a, b, NULL)' and compar() just ignores the 3rd parameter. > > Depending on the ABI, no? Indeed. Most modern architectures pass the third argument as a register, and the receiver never uses the third argument, then the behavior is the same based on the ABI. But it is conceivable to have an ABI where the function cast is not ABI-compatible. At any rate, the patch as Yaakov proposed it does NOT use a shim, but actually compiles three separate functions (qsort, qsort_r, __bsd_qsort_r) with the three different semantics rather than going through shims. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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