[llvm-dev] Using LLD to link against third-party libraries? How?

Zachary Turner via llvm-dev llvm-dev at lists.llvm.org
Wed Dec 12 08:58:28 PST 2018 

Here's a simple example of how to compile a trivial program into a .lib
file, and then link against it.

$ cat a.cpp
int afunc(int x) { return x; }

$ cat main.cpp
#include <iostream>

int afunc(int x);

int main(int argc, char **argv) {
  std::cout << "afunc returned " << afunc(argc) << "\n";
}

// compile the first file
$ clang-cl.exe /c a.cpp

// make a .lib file out of it, similar to the boost library you're trying
to link against.
$ llvm-lib.exe a.obj

// compile the second file
$ clang-cl.exe /c main.cpp

// link the main source file and the static library to produce an executable
$ lld-link.exe main.obj a.lib /out:main.exe

// run the executable
$ main.exe
afunc returned 1

The full documentation of linker flags for link.exe is here:
https://docs.microsoft.com/en-us/cpp/build/reference/linker-options?view=vs-2017

lld-link supports most (but not all) of those, but it's unlikely you'll run
into one of those cases.

On Wed, Dec 12, 2018 at 8:33 AM Zachary Turner <zturner at google.com> wrote:

> You don’t need clang’s standard libraries in order to not get linker
> errors with lld-link.  In fact, I would strongly suggest not trying to use
> them, at least until you get a working build.  Once you get a working
> build, then if you realllly want to you can try to complicate it by using
> libcxx.  Until then, keep it simple and use Microsoft standard library
> (which happens automatically and “just works”
>
> So for now, I suggest removing libcxx and libcxxabi from your cmake
> configurations
>
> On Wed, Dec 12, 2018 at 8:16 AM Osman Zakir via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> I need them so I can build stuff using clang or clang-cl with its C++
>> standard libraries.  To make sure that lld-link won't give errors about
>> missing symbols from any standard libraries.
>>
>> By the way, you wouldn't happen to know how to use link.exe, would you?
>> I might need some help on that to understand how to use lld-link.exe.
>> ------------------------------
>> *From:* Zachary Turner <zturner at google.com>
>> *Sent:* Wednesday, December 12, 2018 9:02 PM
>> *To:* Osman Zakir; llvm-dev
>>
>> *Subject:* Re: [llvm-dev] Using LLD to link against third-party
>> libraries? How?
>>
>> Do you have a specific reason for enabling libcxx and libcxxabi?  Because
>> I would strongly suggest disabling them otherwise
>>
>> On Wed, Dec 12, 2018 at 7:47 AM Osman Zakir <osmanzakir90 at hotmail.com>
>> wrote:
>>
>> I was asking about zlib because CMake couldn't find zlib.  There was no
>> error in the configuration, but knowing how to set the path to zlib would
>> still be nice.
>>
>> I enabled clang, lld, lldb, libcxx and libcxxabi when configuring the
>> build with CMake.  What projects should I build aside from
>> ALL_BUILD.vcxproj and INSTALL.vcxproj to make sure I get the libcxx and
>> libcxxabi projects built as well, along with lld, lldb and clang?
>>
>> I didn't know about the bootstrapping Clang with itself bit, so I didn't
>> do that.
>> ------------------------------
>> *From:* Zachary Turner <zturner at google.com>
>> *Sent:* Wednesday, December 12, 2018 8:40 PM
>> *To:* Osman Zakir
>> *Cc:* llvm-dev at lists.llvm.org
>>
>> *Subject:* Re: [llvm-dev] Using LLD to link against third-party
>> libraries? How?
>>
>> If you want to bootstrap clang and lld using itself, then you should pass
>> -DCMAKE_C_COMPILER=path/to/clang-cl.exe
>> -DCMAKE_CXX_COMPILER=path/to/clang-cl.exe
>> -DCMAKE_LINKER=path/to/lld-link.exe.
>>
>> Note the clang-cl.exe.  ***Not*** clang.exe or clang++.exe.
>>
>> On Wed, Dec 12, 2018 at 7:37 AM Zachary Turner <zturner at google.com>
>> wrote:
>>
>> You shouldn't need zlib to build.  I think we discussed in a previous
>> thread that the only components you should need to complete a build are
>> Microsoft Visual Studio, git, and CMake.
>>
>> On Wed, Dec 12, 2018 at 7:14 AM Osman Zakir via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> How can I tell CMake during the configuration step where to find my zlib
>> installation?
>> ------------------------------
>> *From:* blubee blubeeme <gurenchan at gmail.com>
>> *Sent:* Wednesday, December 12, 2018 7:31 PM
>>
>> *To:* Osman Zakir
>> *Cc:* llvm-dev
>> *Subject:* Re: [llvm-dev] Using LLD to link against third-party
>> libraries? How?
>> I would agree with the next email from  Brian Cain
>>
>> If you do not have specific reason to want to use llvm lld try to use
>> your system provided c++ linker.
>>
>> Bootstrapping the llvm c++ c++abi can be troublesome on Unix like
>> platforms and I have no experience doing anything like that on windows.
>>
>> If you already have a c++ toochain and still want to attempt this then
>> you'll need to svn checkout or git clone a version of the llvm toolchain
>> and build it with your native toolchain then switch to using clang and lld.
>>
>> if you do not have a native c++ toolchain; let's cross that bridge only
>> if you need to.
>>
>> A complete LLVM toolchain includes
>> llvm
>> clang
>> clang-extra-tools
>> lld
>> lldb
>> polly
>> compiler-rt
>> openmp
>> libcxx
>> libcxx-abi
>> testsuite
>> There's "Getting Started Quickly (A Summary" :
>> https://llvm.org/docs/GettingStarted.html
>>
>> With steps to build a complete toolchain. Compilation could take a long
>> time.
>>
>> It would be simpler to use your native c++ and linker unless they do not
>> provide c++17 in which case the above link can get you started.
>>
>> Best
>>
>> On Wed, Dec 12, 2018 at 8:57 PM Osman Zakir <osmanzakir90 at hotmail.com>
>> wrote:
>>
>> So how do I get it to build libcxx and libcxxabi?  I got it from the mono
>> repo and enabled lld, clang, libcxx and libcxxabi.  But I built the two
>> main CMake targets only--all_build and install.  What else do I have to
>> do?  Please let me know.
>> ------------------------------
>> *From:* Zachary Turner <zturner at google.com>
>> *Sent:* Wednesday, December 12, 2018 11:10 AM
>> *To:* blubee blubeeme
>> *Cc:* Osman Zakir; David Greene; llvm-dev at lists.llvm.org
>> *Subject:* Re: [llvm-dev] Using LLD to link against third-party
>> libraries? How?
>>
>> I see you’re using lld-link, so we’re talking about Windows here.
>>
>> Have you gotten it working with the Microsoft linker? Because if so, just
>> replace link.exe with lld-link.exe and it will work.
>>
>> Btw, it’s a bit odd to use clang++ on Windows. The recommended workflow
>> is to use clang-cl. It’s possible to use clang++, but you’re just setting
>> yourself up for more difficulty
>> On Tue, Dec 11, 2018 at 7:23 PM blubee blubeeme via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> I couldn't get it to build libcxx...
>> You need c++ and c++abi to compile c++ code.
>>
>>
>> On Wed, Dec 12, 2018, 07:01 Osman Zakir via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> LLVM on a Developer Command Prompt.  The ones I want to fix first are the
>> ones from Boost and Jinja2Cpp.  I saw some from those as well.
>>
>> If there any standard library ones missing, could it be because I
>> couldn't get it to build libcxx?  I did try to include that, but it seems
>> to be missing.  What should I do?
>> ------------------------------
>> *From:* David Greene <dag at cray.com>
>> *Sent:* Wednesday, December 12, 2018 3:30 AM
>> *To:* Osman Zakir
>> *Cc:* blubee blubeeme; llvm-dev at lists.llvm.org
>>
>> *Subject:* Re: [llvm-dev] Using LLD to link against third-party
>> libraries? How?
>>
>> Are you linking with a C++ compiler?  A lot of those missing symbols
>> look like they come from the C++ standard library.
>>
>>                           -David
>>
>> Osman Zakir via llvm-dev <llvm-dev at lists.llvm.org> writes:
>>
>> > @blubee blubeeme So what do you think? Got any ideas?
>> > ----------------------------------------------------------------------
>> > From: Osman Zakir <osmanzakir90 at hotmail.com>
>> > Sent: Wednesday, December 12, 2018 1:43 AM
>> > To: llvm-dev at lists.llvm.org
>> > Subject: Re: [llvm-dev] Using LLD to link against third-party
>> > libraries? How?
>> > In my code here https://github.com/DragonOsman/currency_converter , I
>> > used C++17 and managed to get it to work (though I'm only using
>> > std::map::insert_or_assign() from C++17). And I'm using Windows, so I
>> > shouldn't use LDFLAGS or CXXFLAGS as environment variables. I'll use
>> > them directly on the compiler command line instead. The libraries I
>> > need to link against are
>> > C:/boost_1_68_0/stage/lib/libboost_system-vc141-mt-x64-1_68.lib and
>> > C:/Jinja2Cpp/install_x64/lib/static/jinja2cpp.lib.
>> >
>> > I tried to build it with this flag:
>> > "
>> > clang++ -std=c++17 -Wall -pedantic -
>> > D_SILENCE_CXX17_ADAPTOR_TYPEDEFS_DEPRECATION_WARNING -
>> > Dvariant_CONFIG_SELECT_VARIANT=variant_VARIANT_NONSTD -
>> > D_SILENCE_CXX17_ALLOCATOR_VOID_DEPRECATION_WARNING -
>> > D_CRT_SECURE_NO_WARNINGS -D_WINSOCK_DEPRECATED_NO_WARNINGS -D_WIN32 -
>> > D_WIN32_WINDOWS -D_NDEBUG -fexceptions -
>> > IC:/Jinja2Cpp/install_x64/include -IC:/json/single_include -
>> > IC:/boost_1_68_0 -
>> > LC:/boost_1_68_0/stage/lib/libboost_system-vc141-mt-x64-1_68.lib -
>> > LC:/Jinja2Cpp/install_x64/lib/static/jinja2cpp.lib
>> > currency_converter.cpp -o currency_converter.exe
>> > "
>> > And I got these warnings and errors from LLD:
>> >
>> > "
>> > lld-link: warning:
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o: locally
>> > defined symbol imported: __std_terminate (defined in libvcruntime.lib
>> > (ehhelpers.obj)) [LNK4217]
>> > lld-link: error: undefined symbol: "public: __cdecl
>> > jinja2::Template::Template(class jinja2::TemplateEnv *)"
>> > (??0Template at jinja2@@QEAA at PEAVTemplateEnv@1@@Z)​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void _
>> > _cdecl handle_request<struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > std::allocator<char>, struct server_session::send_lambda &>(class
>> > boost::basic_string_view<char, struct std::char_traits<char>>, struct
>> > boost::beast::http::message<1, struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > boost::beast::http::basic_fields<class std::allocator<char>>> &&,
>> > struct server_session::send_lambda &, char const *, char const *)"
>> > (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@
>> @V?$allocator at D@2@@http at beast@boost@@V?
>> > $allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_
>> > view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_
>> > body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@
>> @V?$basic_
>> > fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda
>> @server_session@@PEBD3 at Z)
>> > )​
>> > ​
>> > lld-link: error: undefined symbol: "public: class
>> > nonstd::expected_lite::expected<void, class
>> > jinja2::ErrorInfoTpl<char>> __cdecl jinja2::Template::LoadFromFile
>> > (class std::basic_string<char, struct std::char_traits<char>, class
>> > std::allocator<char>> const &)"
>> > (?LoadFromFile at Template@jinja2@@QEAA?AV?$expected at XV?$ErrorInfoTpl at D
>> @jinja2@@@expected_
>> > lite at nonstd@@AEBV?$basic_string at DU?$char_traits at D@std@@V?$allocator at D
>> @2@@std@@@Z)
>> > ​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void _
>> > _cdecl handle_request<struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > std::allocator<char>, struct server_session::send_lambda &>(class
>> > boost::basic_string_view<char, struct std::char_traits<char>>, struct
>> > boost::beast::http::message<1, struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > boost::beast::http::basic_fields<class std::allocator<char>>> &&,
>> > struct server_session::send_lambda &, char const *, char const *)"
>> > (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@
>> @V?$allocator at D@2@@http at beast@boost@@V?
>> > $allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_
>> > view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_
>> > body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@
>> @V?$basic_
>> > fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda
>> @server_session@@PEBD3 at Z)
>> > )​
>> > ​
>> > lld-link: error: undefined symbol: "public: class
>> > std::basic_string<char, struct std::char_traits<char>, class
>> > std::allocator<char>> __cdecl jinja2::Template::RenderAsString(class
>> > std::unordered_map<class std::basic_string<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > jinja2::Value, struct std::hash<class std::basic_string<char, struct
>> > std::char_traits<char>, class std::allocator<char>>>, struct
>> > std::equal_to<class std::basic_string<char, struct
>> > std::char_traits<char>, class std::allocator<char>>>, class
>> > std::allocator<struct std::pair<class std::basic_string<char, struct
>> > std::char_traits<char>, class std::allocator<char>> const, class
>> > jinja2::Value>>> const &)"
>> > (?RenderAsString at Template@jinja2@@QEAA?AV?$basic_string at DU
>> ?$char_traits at D@std@@V?
>> > $allocator at D@2@@std@@AEBV?$unordered_map at V?$basic_string at DU
>> ?$char_traits at D@std@@V?
>> > $allocator at D@2@@std@@VValue at jinja2@@U?$hash at V?$basic_string at DU
>> ?$char_traits at D@std@@V?
>> > $allocator at D@2@@std@@@2 at U?$equal_to at V?$basic_string at DU?$char_traits at D
>> @std@@V?
>> > $allocator at D@2@@std@@@2 at V?$allocator at U?$pair@$$CBV?$basic_string at DU
>> ?$char_
>> > traits at D@std@@V?$allocator at D@2@@std@@VValue at jinja2@@@std@@@2@@4@@Z)​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void _
>> > _cdecl handle_request<struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > std::allocator<char>, struct server_session::send_lambda &>(class
>> > boost::basic_string_view<char, struct std::char_traits<char>>, struct
>> > boost::beast::http::message<1, struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > boost::beast::http::basic_fields<class std::allocator<char>>> &&,
>> > struct server_session::send_lambda &, char const *, char const *)"
>> > (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@
>> @V?$allocator at D@2@@http at beast@boost@@V?
>> > $allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_
>> > view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_
>> > body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@
>> @V?$basic_
>> > fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda
>> @server_session@@PEBD3 at Z)
>> > )​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void _
>> > _cdecl handle_request<struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > std::allocator<char>, struct server_session::send_lambda &>(class
>> > boost::basic_string_view<char, struct std::char_traits<char>>, struct
>> > boost::beast::http::message<1, struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > boost::beast::http::basic_fields<class std::allocator<char>>> &&,
>> > struct server_session::send_lambda &, char const *, char const *)"
>> > (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@
>> @V?$allocator at D@2@@http at beast@boost@@V?
>> > $allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_
>> > view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_
>> > body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@
>> @V?$basic_
>> > fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda
>> @server_session@@PEBD3 at Z)
>> > )​
>> > ​
>> > lld-link: error: undefined symbol: "public: __cdecl
>> > jinja2::Template::~Template(void)" (??1Template at jinja2@@QEAA at XZ)​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("void _
>> > _cdecl handle_request<struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > std::allocator<char>, struct server_session::send_lambda &>(class
>> > boost::basic_string_view<char, struct std::char_traits<char>>, struct
>> > boost::beast::http::message<1, struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > boost::beast::http::basic_fields<class std::allocator<char>>> &&,
>> > struct server_session::send_lambda &, char const *, char const *)"
>> > (??$handle_request at U?$basic_string_body at DU?$char_traits at D@std@
>> @V?$allocator at D@2@@http at beast@boost@@V?
>> > $allocator at D@std@@AEAUsend_lambda at server_session@@@@YAXV?$basic_string_
>> > view at DU?$char_traits at D@std@@@boost@@$$QEAU?$message@$00U?$basic_string_
>> > body at DU?$char_traits at D@std@@V?$allocator at D@2@@http at beast@boost@
>> @V?$basic_
>> > fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda
>> @server_session@@PEBD3 at Z)
>> > )​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("int
>> > `void __cdecl handle_request<struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > std::allocator<char>, struct server_session::send_lambda &>(class
>> > boost::basic_string_view<char, struct std::char_traits<char>>, struct
>> > basic_string_view<char, struct
>> > std::char_traits<char>>::beast::http::message<1, struct
>> > boost::beast::http::basic_string_body<char, struct
>> > std::char_traits<char>, class std::allocator<char>>, class
>> > boost::beast::http::basic_fields<class std::allocator<char>>> &&,
>> > struct server_session::send_lambda &, char const *, char const *)'::
>> > `1'::dtor$114"
>> > (?dtor$114@?0???$handle_request at U?$basic_string_body at DU?$char_traits at D
>> @std@@V?
>> > $allocator at D@2@@http at beast@boost@@V?$allocator at D@std@
>> @AEAUsend_lambda at server_
>> > session@@@@YAXV?$basic_string_view at DU?$char_traits at D@std@@@boost@
>> @$$QEAU?
>> > $message@$00U?$basic_string_body at DU?$char_traits at D@std@@V?$allocator at D
>> @2@@http at beast@boost@@V?
>> > $basic_fields at V?$allocator at D@std@@@234@@http at beast@1 at AEAUsend_lambda
>> @server_
>> > session@@PEBD3 at Z@4HA))​
>> > ​
>> > lld-link: warning:
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o: locally
>> > defined symbol imported: _CxxThrowException (defined in
>> > libvcruntime.lib(throw.obj)) [LNK4217]​
>> > lld-link: error: undefined symbol: "class
>> > boost::system::error_category const & __cdecl
>> > boost::system::detail::system_category_ncx(void)"
>> > (?system_category_ncx at detail@system at boost@@YAAEBVerror_category at 23@XZ)​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("class
>> > boost::system::error_category const & __cdecl
>> > boost::system::system_category(void)"
>> > (?system_category at system@boost@@YAAEBVerror_category at 12@XZ))​
>> > ​
>> > lld-link: warning:
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o: locally
>> > defined symbol imported: __RTDynamicCast (defined in libvcruntime.lib
>> > (rtti.obj)) [LNK4217]​
>> > lld-link: error: undefined symbol: "class
>> > boost::system::error_category const & __cdecl
>> > boost::system::detail::generic_category_ncx(void)"
>> > (?generic_category_ncx at detail@system at boost@@YAAEBVerror_category at 23@XZ)
>> > ​
>> >>>> referenced by
>> > C:\Users\Osman\AppData\Local\Temp\currency_converter-264ae1.o:("class
>> > boost::system::error_category const & __cdecl
>> > boost::system::generic_category(void)"
>> > (?generic_category at system@boost@@YAAEBVerror_category at 12@XZ))​
>> > clang++: error: linker command failed with exit code 1 (use -v to see
>> > invocation)
>> > "
>> >
>> >
>> >  * GitHub - DragonOsman/currency_converter: Application for Computer
>> >    Science course
>> >    Google Maps + Currency Converter Web Application. Application for
>> >    Computer Science course. This is a currency converter web
>> >    application with the frontend and a backend.
>> >    github.com
>> >
>> > *
>> >
>> >
>> > _______________________________________________
>> > LLVM Developers mailing list
>> > llvm-dev at lists.llvm.org
>> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> _______________________________________________
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>>
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