[Bug ld/6468] ld: --export-dynamic fails if no undefined symbols

[nyh at math dot technion.ac.il]

https://sourceware.org/bugzilla/show_bug.cgi?id=6468

Nadav Har'El <nyh at math dot technion.ac.il> changed:

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                 CC|                            |nyh at math dot technion.ac.il

--- Comment #6 from Nadav Har'El <nyh at math dot technion.ac.il> ---
We've encountered the same bug in the OSv project (http://osv.io). No dynamic
section is created, despite an explicit request for "--export-dynamic" which is
silently ignored when the linker decides it doesn't need shared libraries. But
I need --export-dynamic, because I plan to dynamically load shared objects
later.

Our ugly workaround has been to link the program with a dummy shared library,
and that forces the generation of a dynamic section.

We have dummy-shlib.c:
    char force_creation_of_a_dynamic_executable;

compile it with:
    gcc -nodefaultlibs -shared -o dummy-shlib.so dummy-shlib.c

and then link the main program with it:
    ld --export-dynamic ... *.o dummy-shlib.so

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