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Hi all,
I am difficulties compiling a project with clang. This project also uses other framework which has its own dependencies, so it must be compiled with clang and linked against libc++ and libc++abi. The project compiles okay, but when I try to run it I get a segfault. Here is the traceback:
1 __cxxabiv1::__si_class_type_info::__do_dyncast(long, __cxxabiv1::__class_type_info::__sub_kind, __cxxabiv1::__class_type_info const *, void const *, __cxxabiv1::__class_type_info const *, void const *, __cxxabiv1::__class_type_info::__dyncast_result&) const 0x7f55964c89fb 2 ?? 0x7f55967e125e 3 ?? 0x7f55967e349e 4 __gxx_personality_v0 0x7f55967e3010 5 _Unwind_RaiseException 0x7f5595e8f96b 6 __cxa_throw 0x7f55967e2a07 7 std::__throw_ios_failure(const char *) 0x7f55964f8fe8 8 std::basic_filebuf<char, std::char_traits<char>>::underflow() 0x7f5596523a4a 9 std::basic_istream<char, std::char_traits<char>>& std::getline<char, std::char_traits<char>, std::allocator<char>>(std::basic_istream<char, std::char_traits<char>>&, std::string&, char) 0x7f55964e1079 10 sofa::helper::Utils::readBasicIniFile(std::string const&) 0x7f5595351d74 11 sofa::helper::system::FileRepository::FileRepository(const char *, const char *, std::map<std::string, std::list<std::string>> const&) 0x7f55953b8d7b 12 _GLOBAL__sub_I_FileRepository.cpp 0x7f55952d9c24 13 call_init dl-init.c 72 0x7f55981af733 14 _dl_init dl-init.c 119 0x7f55981af733 15 _dl_start_user 0x7f55981a00ca 16 ?? 0x1 17 ?? 0x7ffebb3aa75a 18 ??It seems that the problem arises when trying to init FileRepositories, but I am not really sure if it’s just a buggy library or something else. Have anyone encountered similar behaviour? I am using SOFA v19.12, Ubuntu 18 and clang 6.0
Best regards,
VladIt seems that these difficulties are caused by initialization of DataRepository:
FileRepository DataRepository( "SOFA_DATA_PATH", 0, { { Utils::getSofaPathTo("etc/sofa.ini"), {"SHARE_DIR", "EXAMPLES_DIR"} } });When I change it to:
FileRepository DataRepository( "SOFA_DATA_PATH", ".");Everything works without segfaults. It seems that the problem is related to the zero in char* argument, but I am not entirely sure to what it should be changed.
Hi @Hugo, Hi @Guillaume,
Sorry, I haven’t tried it yet, but I am pretty sure it will do the trick. Thanks a lot!
Best regards,
VladHi @Hugo,
It’s been a while since I returned to this problem, but here is what I found. The bug arises from the fact that
Utils::getSofaPathTo(const std::string& pathFromBuildDir)returns the path to the current dir if a file does not exist (including the situations whencomputeSofaPathPrefix()returns the current path):const std::string Utils::getSofaPathTo(const std::string& pathFromBuildDir) { std::string path = Utils::getSofaPathPrefix() + "/" + pathFromBuildDir; if(FileSystem::exists(path)) { return path; } else { return Utils::getSofaPathPrefix(); } }What happens then in the
readBasicIniFileis that it receives the path to the current dir as the input, callsiniFile.good(), which returns success, and then tries to read from it (the directory, not a file), which is where an exception arises:std::map<std::string, std::string> Utils::readBasicIniFile(const std::string& path) { std::map<std::string, std::string> map; std::ifstream iniFile(path.c_str()); if (!iniFile.good()) { msg_error("Utils::readBasicIniFile()") << "Error while trying to read file (" << path << ")"; } std::string line; while (std::getline(iniFile, line)) { size_t equalPos = line.find_first_of('='); if (equalPos != std::string::npos) { const std::string key = line.substr(0, equalPos); const std::string value = line.substr(equalPos + 1, std::string::npos); map[key] = value; } } return map; }In my case,
pathis equal to/home/user/some-project-build-dir/. What I did to solve the problem was commenting out the following lines inUtils::getSofaPathTo():const std::string Utils::getSofaPathTo(const std::string& pathFromBuildDir) { std::string path = Utils::getSofaPathPrefix() + "/" + pathFromBuildDir; // if(FileSystem::exists(path)) // { return path; // } // else // { // return Utils::getSofaPathPrefix(); // } }Hope what I wrote makes sense to you 🙂
Best regards,
Vlad
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