I accidentally send below message only to David, repostion to groups.
On 01.07.2011 19:57, David Boddie wrote:
On Wed Jun 29 10:38:07 BST 2011, Jarosław Białas wrote:
Recently I tried to use my c++ library in Python using SIP.
In SIP configuration file I added some extra libraries like QtGui,fftw3
and ssl.
Compilation and linking pass without any warnings or errors:
g++ -c -pipe -fPIC -O2 -Wall -W -DNDEBUG -I. -I/usr/include/python2.7 -o
sipmd5testcmodule.o sipmd5testcmodule.cpp
g++ -c -pipe -fPIC -O2 -Wall -W -DNDEBUG -I. -I/usr/include/python2.7 -o
sipmd5testmd5test.o sipmd5testmd5test.cpp
g++ -c -pipe -fPIC -O2 -Wall -W -DNDEBUG -I. -I/usr/include/python2.7 -o
md5test.o md5test.cpp
g++ -Wl,--hash-style=gnu -Wl,--as-needed -shared
-Wl,--version-script=md5test.exp -o md5test.so sipmd5testcmodule.o
sipmd5testmd5test.o md5test.o -lssl
But when I try to import library:
ImportError: ./md5test.so: undefined symbol: MD5
It seems to me that your use of the MD5 function isn't resolved at run-time.
Since you're building a library, the linker doesn't care because it expects
that it will find that symbol later.
When I compiled my code and included it in c++ all worked fine.
When you run ldd on the md5test.so file, what do you get as output? I get
this:
$ ldd md5test.so
libssl.so.0.9.8 => /usr/lib/i686/cmov/libssl.so.0.9.8 (0xb776f000)
libstdc++.so.6 => /usr/local/lib/libstdc++.so.6 (0xb7684000)
libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb765e000)
libgcc_s.so.1 => /usr/local/lib/libgcc_s.so.1 (0xb7640000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb74f1000)
libcrypto.so.0.9.8 => /usr/lib/i686/cmov/libcrypto.so.0.9.8
(0xb73af000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb73ab000)
libz.so.1 => /usr/lib/libz.so.1 (0xb7396000)
/lib/ld-linux.so.2 (0xb77d2000)
If the first line in your output indicates that libssl.so cannot be found
then you may need to update your build file to add a suitable library path
for that library.
David
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I have done everything like you do, but instead of that I get:
$ ldd md5test.so
linux-vdso.so.1 => (0x00007ffffe7cd000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007fa458142000)
libc.so.6 => /lib/libc.so.6 (0x00007fa457de1000)
libm.so.6 => /lib/libm.so.6 (0x00007fa457b5e000)
/lib/ld-linux-x86-64.so.2 (0x00007fa45867b000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fa457948000)
When I tried:
$ g++ -fPIC -shared md5test.cpp -o md5test.so -lssl
$ ldd md5test.so
linux-vdso.so.1 => (0x00007fffad5ff000)
libssl.so.1.0.0 => /usr/lib/libssl.so.1.0.0 (0x00007ff7cc347000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007ff7cc03d000)
libm.so.6 => /lib/libm.so.6 (0x00007ff7cbdba000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007ff7cbba4000)
libc.so.6 => /lib/libc.so.6 (0x00007ff7cb843000)
libcrypto.so.1.0.0 => /usr/lib/libcrypto.so.1.0.0 (0x00007ff7cb486000)
libdl.so.2 => /lib/libdl.so.2 (0x00007ff7cb282000)
libz.so.1 => /usr/lib/libz.so.1 (0x00007ff7cb06a000)
/lib/ld-linux-x86-64.so.2 (0x00007ff7cc7d1000)
Then I realized that libcrypto is also linked to shared library.
I add crypto to configuration file and despite the fact that libssl is
still missing(I really don't know why), libcrypto is present.
Finally I imported md5test successfully.
Thank you for helping me again.
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