On 3/21/11, Peter Rosin <p...@lysator.liu.se> wrote: > Den 2011-03-21 07:36 skrev Satz Klauer: >> Hi, >> >> I try to use libtool to limit the number of symbols exported by a >> shared library. My previous call to create this library looked like >> this and worked fine: >> >> g++ -shared -o ../libmylib.so libmylib.o -pthread -ldl >> >> Now I modified it so that my resulting libmylib.so only exports >> symbols that start with mylib_ : >> >> libtool --mode=link g++ -shared -o ../libmylib.so libmylib.o >> -pthread -ldl -export-symbols-regex mylib_ >> >> But despite the keyword "shared" now libtool complains about a missing >> function main(), means it tries to create an executable program >> instead of a shared library. >> >> What am I doing wrong here? > > -shared is not how you tell libtool to build a shared library (and you do > not want to build a shared library behind the back of libtool by manually > passing -shared to g++, that would defeat the purpose of libtool). You need > to specify "-rpath /where/to/install" to make libtool build what is called > a "libtool library". If a "libtool library" ends up shared, static or > both depends on the system and on how libtool was configured (see > configure options --disable-shared and --disable-static). You also want > to link with .lo files instead of .o files, i.e. "libtool objects" instead > of ordinary plain old objects. "Libtool objects" are created with e.g. > "libtool --mode=compile g++ -o foo.lo foo.cpp" instead of plain old > "g++ -o foo.o foo.cpp" > > So, > > libtool --mode=compile g++ -o libmylib.lo libmylib.cpp > libtool --mode=link g++ -o ../libmylib.la libmylib.lo -pthread -ldl > -export-symbols-regex mylib_ -rpath /usr/local/lib > > might work better (untested)
That works a bit better - so at least I get a shared library now. Unfortunately the -export-symbols-regex seem not to work, it still exports all symbols, not only the ones that start with/contain "mylib_". Elmi _______________________________________________ http://lists.gnu.org/mailman/listinfo/libtool
