I upgrade a program that needs to run on both old and new platform. In the new platform, I have new config so certain functions will not get called in the old platform. However, when I run the program on old platform, it complains missing shared library. What I need is something like “lazyload” or “delayload” mechanism such that when a function is not called the system won’t bother to load its dependent library. But so far I haven’t found a way to achieve it on Linux. I use gcc/c++ with normal link options.
I try simple approach of “-Wl,-z,nodefs” but with error.
/usr/bin/ld: warning: -z nodefs ignored.
So how to enforce it?
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Answer
It looks like your particular linker (you didn’t specify which one, but we can guess it might be the default ld.bfd linker) does not support -z nodefs. Try --allow-shlib-undefined to achieve the same result.