error LNK2019: unresolved external symbol _f_sninit referenced in function

[erkangunpinar]

Hello,

I would like to get help about the following issue in below.

When I compile SNOPT C++ library in Visual Studio 2012, I got the following errors:

1>------ Build started: Project: Solver, Configuration: Debug Win32 ------
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_sninit referenced in function "protected: __thiscall snoptProblem::snoptProblem(char const *,char const *)" (??0snoptProblem@@iae@PBD0@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snspec referenced in function "public: int __thiscall snoptProblem::setSpecsFile(char const *)" (?setSpecsFile@snoptProblem@@QAEHPBD@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_sngetc referenced in function "public: int __thiscall snoptProblem::getParameter(char const *,char *)" (?getParameter@snoptProblem@@QAEHPBDPAD@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_sngeti referenced in function "public: int __thiscall snoptProblem::getIntParameter(char const *,int &)" (?getIntParameter@snoptProblem@@QAEHPBDAAH@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_sngetr referenced in function "public: int __thiscall snoptProblem::getRealParameter(char const *,double &)" (?getRealParameter@snoptProblem@@QAEHPBDAAN@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snset referenced in function "public: int __thiscall snoptProblem::setParameter(char const *)" (?setParameter@snoptProblem@@QAEHPBD@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snseti referenced in function "public: int __thiscall snoptProblem::setIntParameter(char const *,int)" (?setIntParameter@snoptProblem@@QAEHPBDH@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snsetr referenced in function "public: int __thiscall snoptProblem::setRealParameter(char const *,double)" (?setRealParameter@snoptProblem@@QAEHPBDN@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snsetprint referenced in function "public: void __thiscall snoptProblem::setPrintFile(char const *)" (?setPrintFile@snoptProblem@@QAEXPBD@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snend referenced in function "protected: __thiscall snoptProblem::~snoptProblem(void)" (??1snoptProblem@@iae@XZ)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snkera referenced in function "public: virtual int __thiscall snoptProblemA::solve(int)" (?solve@snoptProblemA@@UAEHH@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snjac referenced in function "public: int __thiscall snoptProblemA::computeJac(int &,int &)" (?computeJac@snoptProblemA@@QAEHAAH0@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snmema referenced in function "public: virtual void __thiscall snoptProblemA::setWorkspace(void)" (?setWorkspace@snoptProblemA@@UAEXXZ)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snkerb referenced in function "public: virtual int __thiscall snoptProblemB::solve(int)" (?solve@snoptProblemB@@UAEHH@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snkerc referenced in function "public: virtual int __thiscall snoptProblemC::solve(int)" (?solve@snoptProblemC@@UAEHH@Z)
1>snoptProblem.obj : error LNK2019: unresolved external symbol _f_snmem referenced in function "public: virtual void __thiscall snoptProblemC::setWorkspace(void)" (?setWorkspace@snoptProblemC@@UAEXXZ)
1>C:\Users\erkan-pc\Desktop\prg\Solver\Debug\Solver.exe : fatal error LNK1120: 16 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Probably, I do not use the appropriate library.

I obained snopt7.lib (Win64) and snopt7.lic from optimizers@ccom.ucsd.edu.

And in the link http://ccom.ucsd.edu/~optimizers/downloads/software/trial/fortran/?id=20db6144cb7a, I could not get SNOPT C++ windows 32/64 libraries as the following message occurs:

• The requested URL /~optimizers/static/software/c-cpp/win32/libsnopt7_cpp.zip was not found on this server.

[gnowzil]

Did you link to the snopt library? Those subroutines are all in the Fortran library snopt7.lib.

[erkangunpinar]

Thank you very much for your reply.

Yes, I linked "snopt7.lib", which is Win64 version, 1.47 MB, and I received a link from optimizers@ccom.ucsd.edu. However, I am using Win32 console application (Visual C++). I am not sure the problem arises from this Win32-Win64 conflict.

Another issue is that I could not access precompiled SNOPT C++ windows 32/64 libraries which is in below link:
- http://ccom.ucsd.edu/~optimizers/downloads/software/trial/fortran/?id=20db6144cb7a

[gnowzil]

You can't mix win32 and win64. Also, we haven't had C/C++ precompiled libraries on Windows for a while now. We're working on it...

[erkangunpinar]

Thank you Elizabeth, the program correctly compiled now when I used win 64 for both (lib and Windows Visual Studio C++), and I installed NAG Fortran and linked its following libraries: ifconsol.lib; ifmodintr.lib; libifcoremt.lib; libifport.lib; libirc.lib; libmmt.lib; svml_dispmt.lib.

However this time, problem arises in the f_sninit function in the snoptProblem constructor when I run the code. Below shows the error message:
- Unhandled exception at 0x000007F6F865F5ED in main.exe: 0xC0000005: Access violation writing location 0x00000000000006A2.

Here is screenshoot of the debugging mode:

Again, thank you very much for your concern and help.

[erkangunpinar]

The above-mentioned problem is solved when the latest release of the SNOPT interface was used.

I recommend SNOPT users the below issues to avoid installation errors:

1. Installation and linkage of Fortran libraries such as ifconsol.lib; ifmodintr.lib; libifcoremt.lib; libifport.lib; libirc.lib; libmmt.lib; svml_dispmt.lib.
2. Properly linking snopt7.lib
3. Setting SNOPT_LICENSE in the environment variables
4. As the library is Win64, use of Win64 application in your program.