Hi,
Dnia 29 marca 2012 12:27 Mateusz Loskot <mate...@loskot.net> napisał(a):
> On 29 March 2012 10:10, rno <r...@o2.pl> wrote:
> > Hi all,
> >
> > Considering usage of SOCI I made some simple tests and the following line
> > does not work under Visual Studio 2010 version with PostgreSQL backend:
> >
> > soci::session sql(soci::postgresql, "string");
> >
> > There are linker errors. The dynamically loadable backend version:
> >
> > soci::session sql(*soci::factory_postgresql(), "string");
> >
> > works well.
>
> What do you mean as "does not work" ?
The program soci-test.cpp:
#include <soci.h>
#include <soci-postgresql.h>
int main() {
soci::session sql(soci::postgresql, "string");
return 0;
}
compiled by Visual Studio (cl compiler) by the command:
cl /Fosoci_test.obj /c soci_test.cpp /TP /nologo /EHsc /MD /D "WIN32" /D
"_WIN32_WINNT#0x501" /D "_CONSOLE" /W4 /ID:\3pty\soci-3.1.0\backends\postgresql
/ID:\3pty\soci-3.1.0\core "/IC:\Program Files\PostgreSQL\9.1\include"
and linked by:
link /nologo /OUT:test.exe /LIBPATH:D:\3pty\soci-3.1.0\build\lib\Release
/LIBPATH:D:\3pty\soci-3.1.0\build\bin\Release "/LIBPATH:C:\Program
Files\PostgreSQL\9.1\lib" soci_postgresql_3_1.lib soci_core_3_1.lib libpq.lib
soci_test.obj
gives linker error:
soci_test.obj : error LNK2019: unresolved external symbol "struct
soci::postgresql_backend_factory const soci::postgresql"
(?postgresql@soci@@3Upostgresql_backend_factory@1@B) referenced in function
_main
st.exe : fatal error LNK1120: 1 unresolved externals
The change mentioned in previous e-mail eliminates this error and program is
created correctly. IMHO the 'soci::postgres' literal is more conveninent than
derefernce of 'soci::factory_postgresql()'.
Best regards,
Robert
> > Both versions works under Ubuntu. I suspect errors in export symbols, but
> > maybe I did not notice some settings. Do You have some experience with this
> > case?
>
> Yes, I remember I experienced some linker errors while trying to use
> the static object directly under Visual Studio.
> I'd not tried to pursue it further to find out what's wrong as there
> is factory function available.
>
> Best regards,
>
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