Linking against older symbol version in a .so file

Question

Using gcc and ld on x86_64 linux I need to link against a newer version of a library (glibc 2.14) but the executable needs to run on a system with an older version (2.5). Si

Answer 1

For nim-lang, I elaborated on a solution I found using the C compiler --include= flag as follows:

Create a file symver.h with:

__asm__(".symver fcntl,fcntl@GLIBC_2.4");

Build your program with nim c ---passC:--include=symver.h

As for me I'm cross compiling too. I compile with nim c --cpu:arm --os:linux --passC:--include=symver.h ... and I can get symbol versions using arm-linux-gnueabihf-objdump -T ../arm-libc.so.6 | grep fcntl

I had to remove ~/.cache/nim at some point. And it seems to work.