CODEWITHSUNDEEP
linuxgcclinkeropenssl
Matthew Mitchell
Matthew Mitchell

Reputation: 5393

Can't link to specific OpenSSL library (Linux Mint 13)

OpenSSL doesn't work well with valgrind unless you build it with a particular option so I've build OpenSSL again so that I can debug a program easily. The problem is, every time I build the program it links to an OpenSSL library I do not want. My makefile prints out a lot but the two lines that are most important are:

cc /usr/local/ssl/lib/libcrypto.so.1.0.0 /usr/local/ssl/lib/libssl.so.1.0.0 -L/opt/local/lib  -shared  -o bin/libcbitcoin-crypto.2.0.so build/CBOpenSSLCrypto.o
cc build/testCBNodeFull.o -L/home/matt/Desktop/cbitcoin/bin -lcbitcoin.2.0 -lcbitcoin-network.2.0 -lcbitcoin-storage.2.0 -lcbitcoin-threads.2.0 -lcbitcoin-logging.2.0 -lcbitcoin-crypto.2.0 -lcbitcoin.2.0 -lcbitcoin-file-ec.2.0 -lcbitcoin-rand.2.0 -L/opt/local/lib -lpthread -levent_core -levent_pthreads /usr/local/ssl/lib/libcrypto.so.1.0.0 -o bin/testCBNodeFull

As suggested elsewhere I'm specifying the precise location of the OpenSSL library I want. However ldd bin/testCBNodeFull gives me this:

libcrypto.so.1.0.0 => /lib/x86_64-linux-gnu/libcrypto.so.1.0.0

There is apparently nothing wrong with the library I want to link to:

$ file bin/testCBNodeFull
bin/testCBNodeFull: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0xd9472ecc11e12dc66d165c807a5dbe31fd461cf2, not stripped
$ file /usr/local/ssl/lib/libcrypto.so.1.0.0
/usr/local/ssl/lib/libcrypto.so.1.0.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=0xb75602dc478ae55576e21aac5251b915b1653e73, not stripped

Both compiled as x86-64 as you can see. Maybe there is a tool that allows me to change the location of the shared library of the executable?

Upvotes: 0

Views: 487

Answers (1)

Markku K.
Markku K.

Reputation: 3908

Shared libraries are loaded at runtime, not compile time. So, you need to tell valgrind which OpenSSL library you want it to use at runtime. You can do this by setting the LD_LIBRARY_PATH environment variable to the directory containing your rebuilt object.

export LD_LIBRARY_PATH=/home/matt/mylib
#now try ldd bin/testCBNodeFull

Upvotes: 1

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