Hi Ian, On 14/09/2020 14:12, Ian Lance Taylor via Gcc-patches wrote: > This patch to libbacktrace adds support for MiniDebugInfo, as > requested in PR 93608.
This appears to introduce a failure in the libbacktrace testsuite (observed on both x86 and aarch64): ../gcc/libbacktrace/../test-driver: line 107: 7905 Segmentation fault (core dumped) "$@" > $log_file 2>&1 FAIL: mtest_minidebug > > MiniDebugInfo stores compressed symbol tables for an executable, where > the executable is otherwise stripped. It is documented at > https://fedoraproject.org/wiki/Features/MiniDebugInfo and > https://sourceware.org/gdb/current/onlinedocs/gdb/MiniDebugInfo.html. > > Unfortunately, although debug info processors are already required to > handle data compressed using zlib aka gzip in order to handle zdebug > and SHT_COMPRESSED, the MiniDebugInfo implementation choose to instead > compress the debug information with xz which uses LZMA2. This in > effect forces all debug info processors to add a second decompression > algorithm. Note to future developers: do not do this. > > This libbacktrace implementation includes a new small LZMA > decompressor that just decompresses from one buffer to another. It is > not heavily optimized, and on my laptop runs at about 78% of the speed > of using liblzma directly. I think this is a decent tradeoff for > keeping the code reasonably small. > > Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu. Committed > to mainline. > > Ian Thanks, Alex
