How to make use others' C library installed not for the system-wide (Ubuntu/Linux)? Post: 303043110

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Top Forums Programming How to make use others' C library installed not for the system-wide (Ubuntu/Linux)? Post 303043110 by GRMartin on Saturday 18th of January 2020 10:02:22 AM

01-18-2020

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Quote:

Originally Posted by yifangt

It seems to me that they are different names for the same thing, but I might be wrong.
3) My point is what the right way(s)---may not be the best way--- is to use them.
Can I ask in another way:
What is the best practice to use others library (static *.a and shared *.so) not installed system-wide in C programming? I may need to start a new thread before the topic is veered too far off.

Thank you so much for your time!

No, they are not at all the same thing. An archive is just that. A collection of object files that can be statically linked to your executable. Shared objects are dynamically linked at runtime. They are compiled with a flag that tells the compiler to generate position independent code. Here's what gcc docs have to say:

Code:

-fpic   Generate position-independent code (PIC) suitable for use in a shared library, if supported for the target machine.  Such code accesses all constant addresses through a global offset table (GOT).  The dynamic loader resolves the GOT entries when the program starts (the dynamic loader is not part of GCC; it is part of the operating system).  If the GOT size for the linked executable exceeds a machine-specific maximum size, you get an error message from the linker indicating that -fpic does not work; in that case, recompile with -fPIC instead.  (These maximums are 8k on the SPARC, 28k on AArch64 and 32k on the m68k and RS/6000.  The x86 has no such limit.)

Since archives are statically linked to your your code, it is no longer dependent on the object. With shared objects you remain dependent on the library.

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LEARN ABOUT DEBIAN

pull-lp-source

PULL-LP-SOURCE(1)					      General Commands Manual						 PULL-LP-SOURCE(1)

NAME

       pull-lp-source - download a source package from Launchpad

SYNOPSIS

       pull-lp-source [options] source package [release|version]

DESCRIPTION

       pull-lp-source  downloads  and  extracts  the  specified version of <source package> from Launchpad, or the latest version of the specified
       release.  To request a version from a particular pocket say release-pocket (with a magic -release for only the release pocket).	If no ver-
       sion or release is specified, the latest version in the development release will be downloaded.

OPTIONS

       Listed below are the command line options for pull-lp-source:

       source package
	      This is the source package that you would like to be downloaded from Launchpad.

       version
	      This is the version of the source package to be downloaded.

       release
	      This  is	the  release that you would like the source package to be downloaded from.  This value defaults to the current development
	      release.

       -h, --help
	      Display a help message and exit.

       -d, --download-only
	      Do not extract the source package.

       -m UBUNTU_MIRROR, --mirror=UBUNTU_MIRROR
	      Use the specified Ubuntu mirror.	Should be in the form http://archive.ubuntu.com/ubuntu.  If the package isn't found on	this  mir-
	      ror, pull-lp-source will fall back to Launchpad, as its name implies.

       --no-conf
	      Do not read any configuration files, or configuration from environment variables.

ENVIRONMENT

       All  of	the  CONFIGURATION  VARIABLES  below are also supported as environment variables.  Variables in the environment take precedence to
       those in configuration files.

       DIST   Specifies the default target.

CONFIGURATION VARIABLES

       The following variables can be set in the environment or in ubuntu-dev-tools(5) configuration files.  In  each  case,  the  script-specific
       variable takes precedence over the package-wide variable.

       PULL_LP_SOURCE_UBUNTU_MIRROR, UBUNTUTOOLS_UBUNTU_MIRROR
	      The default value for --mirror.

SEE ALSO

       dget(1), pull-debian-source(1), pull-debian-debdiff(1), ubuntu-dev-tools(5)

AUTHOR

       pull-lp-source  and  this manual page were written by Iain Lane <iain@orangesquash.org.uk>.  Both are released under the GNU General Public
       License, version 3 or later.

ubuntu-dev-tools						   4 August 2008						 PULL-LP-SOURCE(1)