How to include *.so file in makefile

Question

For a program I was linking the static glibc library (which I modified). My makefile looks something like this.

CXX = g++
CXXFILES = main.c

CXXFLAGS = -g -o prog -D_GNU_SOURCE
LIBS = ../../nptl/libpthread.a ../../libc.a -lpthread

all:
    $(CXX) $(CXXFILES) $(LIBS) $(CXXFLAGS)

However, instead of using the static *.a files, I now want to use the dynamic shared object *.so files. Is it enough to replace the *.a files by *.so files in the makefile. If not what is the correct way of doing so. I tried to simply replace the *.a with *.so files in the makefile, but it seems like when I do that the program uses the original glibc (rather than my modified one).

Don't you just need to compile as normal, and then set your `LD_PRELOAD` before you run? http://stackoverflow.com/questions/426230/what-is-the-ld-preload-trick — Oliver Charlesworth, May 21 '12 at 16:37
Have a look at http://www.network-theory.co.uk/docs/gccintro/gccintro_25.html. It should help you out. — Dan Armstrong, May 21 '12 at 16:39
@MetallicPriest: In which case, you should edit your question so that it details all of your constraints. — Oliver Charlesworth, May 21 '12 at 16:44
Read http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html — MetallicPriest, May 21 '12 at 16:45

score 8 · Accepted Answer · answered May 21 '12 at 16:39

8

If you don't want to use the standard libraries, you might need the -nostdlib flag. In addition, if you want to dynamically link libraries, you need to tell the linker where they are. -L/dir/containing -lc.

If you don't want to set a LD_LIBRARY_PATH when executing, you'll need to set rpath, -Wl,--rpath=/path/containing.

answered May 21 '12 at 16:39

greg

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Points for pointing out what `--rpath` does. So that's why so many projects I've downloaded require `LD_LIBRARY_PATH` in their build. – hellork Nov 24 '18 at 18:17

How to include *.so file in makefile

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