Cannot use TimeLimit with msvc 16.8.4

[tomika]

Version: v8.1.8487 Language: C++ Windows 10 Pro

I wrote a CP-Sat solver and wanted to use TimeLimit as suggested in documentation.

atomic<bool> stopped;
model.GetOrCreate<TimeLimit>()->RegisterExternalBooleanAsLimit(&stopped);

Since then I got "unresolved external" linker errors. If I comment out line with

model.GetOrCreate<TimeLimit>()

the program compiles successfully.

The problem is reproducable with example code here: https://github.com/google/or-tools/blob/master/ortools/sat/doc/solver.md#c-code-4

Commenting out line

model.GetOrCreate<TimeLimit>()->RegisterExternalBooleanAsLimit(&stopped);

the program compiles, but keeping it in the result:

1>Source.obj : error LNK2001: unresolved external symbol "private: virtual bool cdecl absl::lts_2020_09_23::flags_internal::FlagImpl::ParseFrom(class absl::lts_2020_09_23::string_view,enum absl::lts_2020_09_23::flags_internal::FlagSettingMode,enum absl::lts_2020_09_23::flags_internal::ValueSource,class std::basic_string<char,struct std::char_traits,class std::allocator > &)" (?ParseFrom@FlagImpl@flags_internal@lts_2020_09_23@absl@@EEAA_NVstring_view@34@W4FlagSettingMode@234@W4ValueSource@234@AEAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) 1>Source.obj : error LNK2001: unresolved external symbol "private: virtual bool cdecl absl::lts_2020_09_23::flags_internal::FlagImpl::ValidateInputValue(class absl::lts_2020_09_23::string_view)const " (?ValidateInputValue@FlagImpl@flags_internal@lts_2020_09_23@absl@@EEBA_NVstring_view@34@@Z) 1>Source.obj : error LNK2001: unresolved external symbol "private: virtual class absl::lts_2020_09_23::string_view __cdecl absl::lts_2020_09_23::flags_internal::FlagImpl::Name(void)const " (?Name@FlagImpl@flags_internal@lts_2020_09_23@absl@@EEBA?AVstring_view@34@XZ) 1>Source.obj : error LNK2001: unresolved external symbol "bool __cdecl absl::lts_2020_09_23::flags_internal::AbslParseFlag(class absl::lts_2020_09_23::string_view,bool ,class std::basic_string<char,struct std::char_traits,class std::allocator > )" (?AbslParseFlag@flags_internal@lts_2020_09_23@absl@@YA_NVstring_view@23@PEA_NPEAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)

Thanks for the help in advance.

[tomika]

If I comment out all refernces to absl::GetFlag from time_limit.h, the problem disappers. Should I download another library file? I've only found ortools.lib in the package, which is linked.

[lperron]

I suppose you are not compiling with c++17 enabled. Laurent Perron | Operations Research | lperron@google.com | (33) 1 42 68 53 00

Le mer. 13 janv. 2021 à 17:55, tomika notifications@github.com a écrit :

If I comment out all refernces to absl::GetFlag from time_limit.h, the problem disappers. Should I download another library file? I've only found ortools.lib in the package, which is linked.

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[tomika]

You're right: If I define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING it compiles successfully. Without these defines it doesn't compile:

1>c:\MSDev\or-tools_VisualStudio2019-64bit_v8.1.8487\include\absl\memory\memory.h(355,1): error C4996: 'std::allocator<std::pair<const K,V>>::rebind': warning STL4010: Various members of std::allocator are deprecated in C++17. Use std::allocator_traits instead of accessing these members directly. You can define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING or _SILENCE_ALL_CXX17_DEPRECATION_WARNINGS to acknowledge that you have received this warning.