To compile against particular version of library

ammayappan · 02-03-2012, 03:16 AM

Hi,
I want to compile my program against particular version(like libc.so.0 than the default libc.so.6)of library.How to do that?

thanks and regards
appan.

lisle2011 · 02-03-2012, 09:44 PM

Number One, make a good backup, restore it to test it's integrity.

Now go ahead and try if you have libc.so.0 There will be copious problems.
Difficulties between libraries built for different versions will certainly give you a headache.

If you were super keen and happy to track down all the bits I still wouldn't mix versions.

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Dark_Helmet · 02-03-2012, 10:08 PM

Caveat: I have not done this myself, but according to two pages I found online (linked at the bottom of this reply), you simply include the specific .so or .a file in the gcc command line. For instance:

Quote:

Code:

gcc -Wall calc.c /usr/lib/libm.a -o calc

Keep in mind, I assume that works with any library you would normally link with using the -l or -L options to gcc. However, because libc is automatically linked, this may not work for it. You may need to do some research to disable ld's automatic inclusion of '-lc' when linking.

The pages I mentioned earlier:
Stack Overflow: How do you link to a specific version of a shared library in GCC
Excerpt from: An Introduction to GCC

ammayappan · 02-07-2012, 05:30 AM

Hi,
Thanks for your suggestions.

I am actually cross compiling Eglibc for the ARM architecture using the Linaro Tool chain.
I cross compiled Eglibc.When i tried to verify it, by linking an application against the eglibc's libc.so.6, it was taking the default libc.so.6, that was actaully present in the Cross-compiler and not my copy of libc.so.6.

As per the caveat of Dark Helmet, it was not working.

So how should i proceed.As per my understanding,in x86,the linker ie ld, reads /etc/ld.so.conf and also the directories specified in the LD_LIBRARY_PATH to take the libraries.
In that way, is there any path or file that needs to be modified?
And any hints on how to disable the automatic inclusion of -lc while loading and link my version of libc.

thanks and regards
appan.