gdb says "cannot open shared object file"

Question

I have one binary and one shared library. The shared library is compiled with:

all:
g++ -g -shared -fpic $(SOURCES) -o libmisc.so

the binary is compiled with:

LIBS=-L../../misc/src

LDFLAGS=-lmisc

all:
g++ -g -o mainx $(INCLUDE) $(SOURCE) $(LIBS) $(LDFLAGS)

I set in ~/.bashrc

export LD_LIBRARY_PATH=/mnt/sda5/Programming/misc/src/

to the libmisc.so output path.

Debugging from console works fine:

gdb mainx

However from Emacs22, launching gdb fails with the following message:

Starting program: /mnt/sda5/Programming/main/src/mainx /mnt/sda5/Programming/main/src/mainx: error while loading shared libraries: libmisc.so: cannot open shared object file: No such file or directory

This looks very tricky for the moment, and I couldn't solve it. I am not sure if this a emacs's problem, or I should pass a parameter in gdb's command line.

yhager · Accepted Answer · 2009-05-31 16:36:44Z

6

Emacs probably does not read your .bashrc before it invokes gdb. Try to put 'set solib-search-path' and 'set solib-absolute-path in your .gdbinit file instead

answered May 31, 2009 at 16:36

yhager

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1 Comment

grayasm Over a year ago

Thank you very much for your answer. It worked very well. I searched previously the gdb manual with key words to find a quick answer but I failed. You saved my day :) I will read of course the gdb manual in depth these days. vmihai.

Employed Russian · Accepted Answer · 2009-05-31 18:16:08Z

5

Emacs doesn't invoke gdb via bash, but rather invokes it directly, and so .bashrc changes do not take effect and LD_LIBRARY_PATH is not set.

If you quit emacs, open a new shell (so LD_LIBRARY_PATH is set), start emacs in it, and then do M-X gdb, then it would work.

Setting solib-search-path in GDB is a hack.

A much better fix is to build the executable in such a way that it doesn't need LD_LIBRARY_PATH to begin with:

LDFLAGS=-lmisc -Wl,-rpath=/mnt/sda5/Programming/misc/src

answered May 31, 2009 at 18:16

Employed Russian

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2 Comments

Don Wakefield Over a year ago

Not available on all platforms, and when it is, -rpath has it's problems too: rpath(linking) It's always a tradeoff.

grayasm Over a year ago

Thanks for the answer. That sounds reasonable also.

Paul · Accepted Answer · 2011-08-12 14:48:18Z

5

Another way is to create a .gdbinit file in your $HOME and set the LD_LIBRARY_PATH there:

# file .gdbinit
set env LD_LIBRARY_PATH=/mnt/sda5/Programming/misc/src/

This is convenient if you need to debug with that LD_LIBRARY_PATH frequently (and don't want to remember running emacs from your shell every time).

answered Aug 12, 2011 at 14:48

Paul

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