sw: work around what seems to be a gcc-4.8 compiler bug

Desktop / LibreOffice - Miklos Vajna [collabora.co.uk] - 13 February 2018 12:36 EST

Thread 1 "soffice.bin" received signal SIGSEGV, Segmentation fault. (anonymous namespace)::print_type<15> (ctx=..., info=0x7fffffff7f90, unknown_name=...) at ../../../../../libstdc++-v3/src/c++11/debug.cc:641 641 ../../../../../libstdc++-v3/src/c++11/debug.cc: No such file or directory. (gdb) up #1 0x00007ffff6abb008 in (anonymous namespace)::print_description (ctx=..., inst=...) at ../../../../../libstdc++-v3/src/c++11/debug.cc:817 817 in ../../../../../libstdc++-v3/src/c++11/debug.cc (gdb) #2 0x00007ffff6abc7aa in (anonymous namespace)::print_description (param=..., ctx=...) at ../../../../../libstdc++-v3/src/c++11/debug.cc:835 835 in ../../../../../libstdc++-v3/src/c++11/debug.cc (gdb) #3 __gnu_debug::_Error_formatter::_M_error (this=0x7fffffff7af0) at ../../../../../libstdc++-v3/src/c++11/debug.cc:1061 1061 in ../../../../../libstdc++-v3/src/c++11/debug.cc (gdb) #4 0x00007fffca2b6313 in __gnu_debug::operator!=<__gnu_cxx::__normal_iterator > >, std::__debug::vector > > (__lhs=0x0, __rhs=invalid iterator) at /usr/include/c++/4.8/debug/safe_iterator.h:535 535 _GLIBCXX_DEBUG_VERIFY(! __lhs._M_singular() && ! __rhs._M_singular(), (gdb) #5 0x00007fffca7f3de2 in SwAnchoredObject::UpdateObjInSortedList (this=0x1fa6fd8) at /git/libreoffice/master/sw/source/core/layout/anchoredobject.cxx:629 629 for (SwAnchoredObject* pAnchoredObj : *pObjs)

Given that valgrind doesn't point out anything and the old and the new code is meant to be the same, my only guess is that the baseline gcc has some codegen bug. This happens reasonably frequently, current bugdoc was a DOCX file with 4 shapes anchored to the same paragraph, affecting only dbgutil builds, it seems.

Change-Id: I2316e25eea87f2aa5736576d5168e113480f80e4 Reviewed-on: https://gerrit.libreoffice.org/49631

d34dcde1d0cc sw: work around what seems to be a gcc-4.8 compiler bug
sw/source/core/layout/anchoredobject.cxx | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

Upstream: cgit.freedesktop.org


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