error LNK2001

[eaglesharkmayonnaise]

1. git clone https://github.com/fpagliughi/sockpp
2. run Visual Studio 2019 Developer Command Prompt v16.5.4
3. cd sockpp && mkdir build && cd build
4. run cmake

cmake .. -G"NMake Makefiles" -DSOCKPP_BUILD_STATIC=SOCKPP_BUILD_STATIC -DCMAKE_CXX_FLAGS_RELEASE=/MT -DCMAKE_BUILD_TYPE=Release

5. build examples/tcp/tcpecho.cpp

1>main.obj : error LNK2001: unresolved external symbol "class std::basic_ostream<char,struct std::char_traits<char> > & __stdcall sockpp::operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class sockpp::inet_address const &)" (??6sockpp@@YGAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV12@ABVinet_address@0@@Z)
1>main.obj : error LNK2001: unresolved external symbol "public: static class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __stdcall sockpp::socket::error_str(int)" (?error_str@socket@sockpp@@SG?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@H@Z)
1>main.obj : error LNK2001: unresolved external symbol "public: static void __stdcall sockpp::socket::destroy(void)" (?destroy@socket@sockpp@@SGXXZ)
1>main.obj : error LNK2001: unresolved external symbol "public: static void __stdcall sockpp::socket::initialize(void)" (?initialize@socket@sockpp@@SGXXZ)

[fpagliughi]

Apologies, I'm not much of a Windows user, but I noticed two things when I was doing some tests with Windows:

1. I had the best success when I specified exactly what compiler I wanted to use via the Generator option.
2. The Microsoft compiler(s) seemed to keep defaulting to a 32-bit build on a 64-bit machine. I have no idea why. But you seem to have to force a 64-bit build, and that can be different depending on which version of the compiler.

For MSVS 2019, I have been using this:

cmake -G "Visual Studio 16 2019" -Ax64 -DSOCKPP_BUILD_EXAMPLES=ON ..

I'm going to pull out a Windows machine later this week. I'll double check if there's some issue with the static build, but to my knowledge it was working fine.

[eaglesharkmayonnaise]

1. cmake

C:\Users\ssss\Desktop\sockpp\build>cmake -G "Visual Studio 16 2019" -Ax64 -DSOCKPP_BUILD_EXAMPLES=ON ..
-- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.18363.
-- The C compiler identification is MSVC 19.25.28614.0
-- The CXX compiler identification is MSVC 19.25.28614.0
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.25.28610/bin/Hostx64/x64/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Creating static library: sockpp-static
-- Looking for pthread.h
-- Looking for pthread.h - not found
-- Found Threads: TRUE
-- Using library for samples: sockpp-static
-- Using library for samples: sockpp-static
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/ssss/Desktop/sockpp/build

2. opened sockpp.sln and build it

1>------ Build started: Project: tcpechotest, Configuration: Debug x64 ------
1>tcpechotest.cpp
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\random(1902,5): error C2338: invalid template argument for uniform_int_distribution: N4659 29.6.1.1 [rand.req.genl]/1e requires one of short, int, long, long long, unsigned short, unsigned int, unsigned long, or unsigned long long
1>C:\Users\ssss\Desktop\sockpp\examples\tcp\tcpechotest.cpp(92): message : see reference to class template instantiation 'std::uniform_int_distribution<char>' being compiled
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\random(1902,1): error C2338: note: char, signed char, unsigned char, char8_t, int8_t, and uint8_t are not allowed
1>C:\Users\ssss\Desktop\sockpp\examples\tcp\tcpechotest.cpp(106,9): warning C4244: 'initializing': conversion from 'ssize_t' to 'int', possible loss of data
1>Done building project "tcpechotest.vcxproj" -- FAILED.
2>------ Skipped Build: Project: INSTALL, Configuration: Debug x64 ------
2>Project not selected to build for this solution configuration 
========== Build: 0 succeeded, 1 failed, 12 up-to-date, 1 skipped ==========

[fpagliughi]

Oh, I think there's a fix for that in the develop branch from PR #44, originally reported in Iuuse #42.

[fpagliughi]

I don't know if this was actually foxed or not, but will attempt to recreate before the next v0.8.1 release.

[fpagliughi]

This all builds for me now with the latest release. If you are still having trouble, feel free to reopen this issue with any new information.