linking question

queency · 11-10-2007, 02:49 AM

Hi guys:

when i: g++ main.cc databaseWrap.cc /usr/lib/libsqlite3.so.0
everythink compiled and linked ok !

when i gcc main.cc databaseWrap.cc
all compiled ok!

when i:ld main.o databaseWrap.o /usr/lib/libstdc++.so.6 /usr/lib/libsqlite3.so.0

ld: warning: cannot find entry symbol _start; defaulting to 0000000000400848
main.o: In function `__static_initialization_and_destruction_0(int, int)':
main.cc

.text+0x28): undefined reference to `__dso_handle'

what is wrong with my linkage section ??

keratos · 11-10-2007, 04:23 AM

well your programs cleary depend on other modules in which a variable, class or function is expected to be found, but has not.

__dso_handle in this case!

without knowing the source code, its impossible to say more.

ta0kira · 11-10-2007, 05:48 PM

You need to link C++ programs with g++ instead of ld because there are built-in things in C++ which require hidden code. In this case, there's a non-POD static object somewhere in your program which needs to be constructed/destructed outside of main. It's probably cin/cout/cerr that are in need of construction. There's no way around it, but it's the price you pay for C++.
ta0kira