mirror of https://gitee.com/openkylin/hdf5.git
419e47e85e
Package: libhdf5-100 Version: 1.10.0-patch1+docs-3 Tags: upstream patch User: debian-sparc@lists.debian.org Usertags: sparc64 X-Debbugs-Cc: debian-sparc@lists.debian.org, Ghislain Vaillant <ghisvail@gmail.com> Control: affects -1 src:h5py Hi, Currently libhdf5-100 performs unaligned memory accesses on sparc64 in certain cases, and this is causing the latest version of h5py to FTBFS due to the test suite being killed with SIGBUS when doing vlen-related tests (the tests in question being new in the latest upstream version). On investigating, there are two issues: 1. NO_ALIGNMENT_RESTRICTIONS is being defined on sparc64. GCC is sufficiently smart to notice that the test program run when configuring is performing unaligned accesses, and so instead of using the usual multi-byte load instructions (which require the address to be aligned), it expands it out into individual byte loads, and therefore the test actually succeeds. This is only because GCC can statically determine that the address is unaligned, and therefore tries to be helpful (since it knows using multi-byte loads will never work), whereas for a general address it will assume the address is aligned and emit a single multi-byte load. Adding in a few volatile qualifiers in the important places ensures that GCC can no longer statically prove the relevant addresses are unaligned, and therefore it uses the normal multi-byte load instructions and the test program will crash, so configure knows not to define NO_ALIGNMENT_RESTRICTIONS. 2. Even with that fixed, H5T_vlen_reclaim_recurse needs fixing to ensure it doesn't perform unaligned accesses when not supported. With the attached patch, h5py's test suite now passes again. Please feel free to forward this patch upstream if you deem it acceptable. Regards, James Gbp-Pq: Name fix-unaligned-accesses.patch |
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