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Top Forums UNIX for Advanced & Expert Users What happens when an exe/lib links to another shared one: Post 302087195 by vibhor_agarwali on Wednesday 30th of August 2006 08:32:52 AM
Old 08-30-2006
Error What happens when an exe/lib links to another shared one:

We build our code on all platforms Sol, Hp, Aix, Sgi & linux.

Some base libraries have changed.
All the dependent exe & lib which use those base libraries have changed in all platforms in terms of size/checksum or both except linux.

No code has changed in these.

We have a post utility which compares them from the previous ones on the basis of size & checkum. This thing is failing in linux as they are not getting changed.

As far as i know, when a library or exe has build time dependency on another shared library:
It keeps the name of the shared library in its table somewhere and uses the symbol name of the function or variable which it requires.
If its an archive library then it copies the stuff it requires.

Am i right? Smilie

I don't have any meaningful reason about this anomaly in Linux.

Can you suggest some? Smilie

Thanks
 

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DH_SHLIBDEPS(1) 						     Debhelper							   DH_SHLIBDEPS(1)

NAME
dh_shlibdeps - calculate shared library dependencies SYNOPSIS
dh_shlibdeps [debhelperoptions] [-Lpackage] [-ldirectory] [-Xitem] [--params] DESCRIPTION
dh_shlibdeps is a debhelper program that is responsible for calculating shared library dependencies for packages. This program is merely a wrapper around dpkg-shlibdeps(1) that calls it once for each package listed in the control file, passing it a list of ELF executables and shared libraries it has found. OPTIONS
-Xitem, --exclude=item Exclude files that contain item anywhere in their filename from being passed to dpkg-shlibdeps. This will make their dependencies be ignored. This may be useful in some situations, but use it with caution. This option may be used more than once to exclude more than one thing. -- params Pass params to dpkg-shlibdeps(1). -uparams, --dpkg-shlibdeps-params=params This is another way to pass params to dpkg-shlibdeps(1). It is deprecated; use -- instead. -ldirectory[:directory ...] With recent versions of dpkg-shlibdeps, this option is generally not needed. It tells dpkg-shlibdeps (via its -l parameter), to look for private package libraries in the specified directory (or directories -- separate with colons). With recent versions of dpkg-shlibdeps, this is mostly only useful for packages that build multiple flavors of the same library, or other situations where the library is installed into a directory not on the regular library search path. -Lpackage, --libpackage=package With recent versions of dpkg-shlibdeps, this option is generally not needed, unless your package builds multiple flavors of the same library or is relying on debian/shlibs.local for an internal library. It tells dpkg-shlibdeps (via its -S parameter) to look first in the package build directory for the specified package, when searching for libraries, symbol files, and shlibs files. If needed, this can be passed multiple times with different package names. EXAMPLES
Suppose that your source package produces libfoo1, libfoo-dev, and libfoo-bin binary packages. libfoo-bin links against libfoo1, and should depend on it. In your rules file, first run dh_makeshlibs, then dh_shlibdeps: dh_makeshlibs dh_shlibdeps This will have the effect of generating automatically a shlibs file for libfoo1, and using that file and the libfoo1 library in the debian/libfoo1/usr/lib directory to calculate shared library dependency information. If a libbar1 package is also produced, that is an alternate build of libfoo, and is installed into /usr/lib/bar/, you can make libfoo-bin depend on libbar1 as follows: dh_shlibdeps -Llibbar1 -l/usr/lib/bar SEE ALSO
debhelper(7), dpkg-shlibdeps(1) This program is a part of debhelper. AUTHOR
Joey Hess <joeyh@debian.org> 11.1.6ubuntu2 2018-05-10 DH_SHLIBDEPS(1)
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