Moon Hwang wrote: > I make my own library using this makefile. You might consider using automake and libtool, which takes care of all this for you. > SONAME := lib$(TARGET)$(MODI).so .so is not the universal extension for shared libraries. Under windows (and Cygwin) it's .dll, under darwin it's .dylib, and so on. You really shouldn't hardcode this information and expect to have a portable makefile. Under Cygwin the normal convention is that for a library named "foo" the shared library is cygfoo.dll and the import libray is libfoo.dll.a. If it is a versioned library then it is cygfoo-n.dll and libfoo-n.dll.a. > g++ -I /usr/X11R6/include -I ../../../Include -I > /usr/local/include/boost_1_32_0 -L /usr/X11R6/lib -L > /home/MHHwang/lib/Release Bomb.cpp -o Bomb -lxyDEVS -lpthread > > /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/bin/ld: > cannot find -lxyDEVS > collect2: ld returned 1 exit status Under Cygwin, when you specify -lxyDEVS, the linker will search for the following filenames (in this order): libxyDEVS.dll.a xyDEVS.dll.a libxyDEVS.a cygxyDEVS.dll libxyDEVS.dll xyDEVS.dll (As documented at <http://sourceware.org/binutils/docs-2.16/ld/WIN32.html#WIN32>.) So of course it errors because .so is not tne correct extension under Cygwin. You can still link against a .so file but you will probably have to specify its full filename like with other link objects, as opposed to -lfoo. Brian
