What is the file
/etc/ld.so.nohwcap used for?. In my machine (
Debian 7), this file is not found. Therefore, Which package or library this file belongs to?
It doesn't belong to any package. It's a configuration file you create to modify the behaviour of the dynamic linker.
man ld.so provides the detail.
When this file is present the dynamic linker will load the non-optimized version of a library, even if the CPU supports the optimized version.
Although no reference is made to the file in
man ld.so on Jessie (Debian 8), the behaviour has not changed.