c/c++ boost - problem compiling

Question

I've been pulling my hair out trying to figure out how to compile my app with boost regex.

I've installed boost from source on centos 5.

g++ -lboost_regex -o my_app my_app.c $(mysql_config --libs --cflags)

It compiles without any errors, however when I execute it:

error while loading shared libraries: libboost_regex.so.1.46.1: cannot open shared object file: No such file or directory

The location of that file is:

/usr/local/lib/libboost_regex.so.1.46.1

Anyone experience the same issues?

Given that this is about Boost, why the C tag and the "C/C++" in the question title? Shouldn't this be straight C++? — David Thornley
– David Thornley, Commented Mar 24, 2011 at 16:43

Mark B · Accepted Answer · 2011-03-24 16:10:12Z

3

Did you try LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH your_program to make sure it knows where to find the shared object? You can set the path when you link by using -Wl,-R/usr/local/lib.

EDIT: To be more clear, when you link your code the linker will embed an RPATH and RUNPATH into the binary. These values tell the runtime loader where to find required shared objects.

If you add -Wl,-R/usr/local/lib to your link command that should cause it to embed that directory and always check it when loading your program.

edited Mar 24, 2011 at 16:10

answered Mar 24, 2011 at 15:40

Mark B

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4 Comments

Joe Over a year ago

that worked! however, is there a way permanately set the LD_LIBRARY_PATH so I don't have to call it before my app's path every time?

Joe Over a year ago

sorry to bug you one last time, I'm a newbie with c++. I've added the -R /usr/local/lib to the g++ compile command however it's giving me "g++: unrecognized option '-R'"

Mark B Over a year ago

@Joe You're right, it's a linker option so you have to pass it through with -Wl,, I fixed my answer.

Notinlist Over a year ago

I don't get something in general. Let me grab this opportunity to ask the question. Why do we need libboost_regex.so for the executable to work after we used -lboost_regex?

0x1F602 · Accepted Answer · 2011-03-24 15:41:41Z

Try this.

$ LD_LIBRARY_PATH=/usr/local/lib:LD_LIBRARY_PATH $ export LD_LIBRARY PATH

Now try and tell us what happens.

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