llvm dev - Dec 2018 - Using LLD to link against third-party libraries? How?

I already mentioned what flag I tried.  It's in the first email in this
thread.  And I want to link against Boost.System and the Jinja2Cpp library (the
latter's documentation can be found here:
https://github.com/flexferrum/Jinja2Cpp .  And I also have some GUI applications
using FLTK as well that I want to try to build using LLVM as well, so I'll
have to know how to link against FLFK's libraries too.
[https://avatars3.githubusercontent.com/u/1494258?s=400&v=4]<https://github.com/flexferrum/Jinja2Cpp>

GitHub - flexferrum/Jinja2Cpp: Jinja2 C++ (and for C++) almost full-conformance
template engine implementation<https://github.com/flexferrum/Jinja2Cpp>
Join GitHub today. GitHub is home to over 28 million developers working together
to host and review code, manage projects, and build software together.
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________________________________
From: blubee blubeeme <gurenchan at gmail.com>
Sent: Wednesday, December 12, 2018 12:54 AM
To: Osman Zakir
Cc: llvm-dev
Subject: Re: [llvm-dev] Using LLD to link against third-party libraries? How?

That depends on the library that you'd like to link against, it's
usually in the documentation of that project.

What project are you trying to link and what linker flags have you tried so far?

Best

On Wed, Dec 12, 2018 at 3:49 AM Osman Zakir via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
I add the -fuse-ld=lld flag to the compiler command line itself.   And I
included LLD when I built LLVM (I checked out the mono repo and built that
version).

What command line arguments should I pass to LLD when I want to link against
third-party libraries?  That's what I'm asking.
_______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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The documentation on that github page says c++14

make sure your
CXXFLAGS have -std=c++14
LDFLAGS have -fuse-ld=lld -lc++ -lc++abi -lm -lc

Going forward If the link fails u have to provide more information as to
what errors ur getting.

Best

On Wed, Dec 12, 2018 at 4:02 AM Osman Zakir via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I already mentioned what flag I tried.  It's in the first email in this
> thread.  And I want to link against Boost.System and the Jinja2Cpp library
> (the latter's documentation can be found here:
> https://github.com/flexferrum/Jinja2Cpp .  And I also have some GUI
> applications using FLTK as well that I want to try to build using LLVM as
> well, so I'll have to know how to link against FLFK's libraries
too.
> <https://github.com/flexferrum/Jinja2Cpp>
> GitHub - flexferrum/Jinja2Cpp: Jinja2 C++ (and for C++) almost
> full-conformance template engine implementation
> <https://github.com/flexferrum/Jinja2Cpp>
> Join GitHub today. GitHub is home to over 28 million developers working
> together to host and review code, manage projects, and build software
> together.
> github.com
>
> ------------------------------
> *From:* blubee blubeeme <gurenchan at gmail.com>
> *Sent:* Wednesday, December 12, 2018 12:54 AM
> *To:* Osman Zakir
> *Cc:* llvm-dev
> *Subject:* Re: [llvm-dev] Using LLD to link against third-party
> libraries? How?
>
> That depends on the library that you'd like to link against, it's
usually
> in the documentation of that project.
>
> What project are you trying to link and what linker flags have you tried
> so far?
>
> Best
>
> On Wed, Dec 12, 2018 at 3:49 AM Osman Zakir via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> I add the -fuse-ld=lld flag to the compiler command line itself.   And I
> included LLD when I built LLVM (I checked out the mono repo and built that
> version).
>
> What command line arguments should I pass to LLD when I want to link
> against third-party libraries?  That's what I'm asking.
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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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)
"
[https://avatars0.githubusercontent.com/u/18173932?s=400&v=4]<https://github.com/DragonOsman/currency_converter>

GitHub - DragonOsman/currency_converter: Application for Computer Science
course<https://github.com/DragonOsman/currency_converter>
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



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