问题
I know that the re plenty of similar questions, but mine is litle bit different and non them helped me.
I am using boost-iostreams library and here is my problem, i tried to link my program with libraries:
ld -I/usr/include/boost/iostreams/ -I/usr/include/boost/iostreams/device/ -L/usr/lib/libboost_iostreams.so -lboost-iostreams fd.o -o x
And the result was:
ld: cannot find -lboost-iostreams
When i tried to write it explicitly:
ld -I/usr/include/boost/iostreams/ -I/usr/include/boost/iostreams/device/ --library /usr/lib/libboost_iostreams.so -lboost-iostreams fd.o -o x
It told me that the library dont exist:
ld: cannot find -l/usr/lib/libboost_iostreams.so
ld: cannot find -lboost-iostreams
But it does:
$ ls -l /usr/lib/libboost_iostreams*
-rw-r--r-- 1 root root 204682 feb 4 05:28 /usr/lib/libboost_iostreams.a
lrwxrwxrwx 1 root root 20 feb 4 05:28 /usr/lib/libboost_iostreams-mt.a -> libboost_iostreams.a
lrwxrwxrwx 1 root root 28 feb 4 05:28 /usr/lib/libboost_iostreams-mt.so -> libboost_iostreams.so.1.49.0
lrwxrwxrwx 1 root root 28 feb 4 05:28 /usr/lib/libboost_iostreams.so -> libboost_iostreams.so.1.49.0
-rw-r--r-- 1 root root 94280 feb 4 05:28 /usr/lib/libboost_iostreams.so.1.49.0
About me:
- OS: Debian 7 Wheezy
- prog. lang.: c++
- compiler: g++ (Debian 4.7.2-5) 4.7.2
- linker: GNU ld (GNU Binutils for Debian) 2.22
- boost library ver.: 1.49 ( from debian repo )
Thanks!
EDIT:
The right option should be -lboost_iostreams, not -lboost-iostreams
EDIT2:
After edit my command was:
ld fd.o -I/usr/include/boost/iostreams/ -I/usr/include/boost/iostreams/device/ -o x $(LIB_PATH) -lboost_iostreams
Where libpath is ONE of following:
LIB_PATH=
LIB_PATH=-L/usr/lib/
LIB_PATH=/usr/lib/libboost_iostreams.so
LIB_PATH=/usr/lib/libboost_iostreams.a
but the result is still:
ld: warning: cannot find entry symbol _start; defaulting to 000000000804cc10
fd.o: In function `__static_initialization_and_destruction_0(int, int)':
fd.cpp:(.text+0xd6): undefined reference to `__dso_handle'
ld: x: hidden symbol `__dso_handle' isn't defined
ld: final link failed: Bad value
make: *** [x] Error 1
回答1:
Generally speaking you do not call ld directly but rather call gcc or g++ instead. This might add the correct search paths when linking.
If you link explicitly, you must not include the -l flag. Just add /usr/lib/libboost_iostreams.a or /usr/lib/libboost_iostreams.so to the list of files that you are linking.
The -l flag add the lib prefix and the .so or .a suffix.
来源：https://stackoverflow.com/questions/17950840/boost-iostreams-library-exist-but-i-am-unable-link-it