9

On Linux with the GNU toolchain, I know how to control exported symbols from a shared library with a version script (gcc -Wl,--version-script=symbols.map), but I would like to list exported symbols on the command line instead. IOW, I would like the equivalent of

link /EXPORT:foo

from the MS toolchain. Is it possible ?

EDIT:

My question may not be very clearn: if I have a library libfoo.so, and I want to only export libraries foo1 and foo2, I can go create a version script foo.linux as follows

libfoo.so
{
global:
    foo1;
    foo2;
local:
    *;
}

And do

gcc -shared foo.c -Wl,--version-script=foo.linux -o libfoo.so -soname libfoo.so

I would like to be able to do something like this instead:

gcc -shared foo.c -Wl,--export-symbol=foo1 -Wl,--export-symbol=foo2 -o libfoo.so -soname libfoo.so
David Cournapeau
  • 78,318
  • 8
  • 63
  • 70

3 Answers3

4

I may be eight years late, but yes, you actually can do what you want.

Use Bash process substitution:

gcc -shared foo.c -Wl,--version-script=<(echo "{global:foo1;foo2;local:*;};") -o libfoo.so -soname libfoo.so
hidefromkgb
  • 5,834
  • 1
  • 13
  • 44
3

I'm not sure that you can do this like you want. One way is with the linker version script like you mentioned. Another way is to add in your source code __attribute__ ((visibility("default"))) for whatever you want exported and compile everything with -fvisibility=hidden

Unknown
  • 5,722
  • 5
  • 43
  • 64
-3

readelf and objdump have lots of options. How about:

readelf --symbols --use-dynamic $yourlib.so
pixelbeat
  • 30,615
  • 9
  • 51
  • 60