How to make use others' C library installed not for the system-wide (Ubuntu/Linux)? Post: 303043076

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Top Forums Programming How to make use others' C library installed not for the system-wide (Ubuntu/Linux)? Post 303043076 by yifangt on Friday 17th of January 2020 12:36:01 PM

01-17-2020

Registered User

Thanks Greg, and Neo---although your input is more than I expected.
I found the topic deviated from the original point I was asking, because there are many aspects hidden behind my question that I do not know. However, It is easier for me to learn by example, especially on coding.
Normally, I found there is one layer missing to me when others library is installed in the system. Simply sudo apt-get install / sudo yum install etc does not help me in actual C coding from scratch.

Here, I want to stick to the tech and only the tech part, i.e: "In my this example, what is the correct/standard way to make use the downloaded htslib not installed system-wide? "

1) I want to confirm the options of my command line that are correct in general, while I'm trying to find the official reference (which normally do not have real hands-on example, e.g $ORIGIN);

2) Trying to catch the standard way to use non-system *.a and *.so files in C coding on top of point 1). Here "standard way" can be replaced with "common way" if there is not all-for-one solution, which is normally the case.
Two examples, (1) the standard way to use shared objects (.so) is to install them in the system directories Thanks Greg! This cleared my confusion. The not-answered part is how to make use of the *.so file when it is not installed system wide. (2) I saw people usually use static library for *.a files and dynamic library for *.so files, but Greg consistently use archives for *.a files and shared objects for *.so ones. It seems to me that they are different names for the same thing, but I might be wrong.
This was a so big confusing wording! And I owe an apology to all who read this post!
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!

Last edited by yifangt; 01-18-2020 at 02:47 PM..

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LEARN ABOUT SUSE

xft-config

xft-config(1)						      General Commands Manual						     xft-config(1)

NAME

       xft-config - report Xft version, compiler, linker, and/or installation directory information

SYNOPSIS

       xft-config { --exec-prefix[=local_prefix] | --prefix[=local_prefix] | --cflags | --libs } ...

       xft-config --version

DESCRIPTION

       xft-config  reports information of interest to users and developers about the installed version of the X FreeType library, Xft(3).  Depend-
       ing on how it is invoked, xft-config reports the installed version of Xft, the compiler and linker flags that are required to  successfully
       compile	and  link  C  (or C-compatible) code that uses the library, and/or the directories used by the GNU Autotools to install its files.
       Note that if the system's installed version of Xft came from an OS vendor or other third party, the actual location of its files may differ
       from those reported by xft-config.  The system adminstrator can also relocate Xft's files.

       If invoked without any arguments, xft-config will print a usage message on standard error and exit.

OPTIONS

       --cflags
	      Report the compiler flags that are required to compile code that uses Xft symbols.

       --exec-prefix[=local_prefix]
	      If  specified  without the parameter local_prefix, report the file specification prefix that Xft uses for installation of executable
	      files.  If local_prefix is specified, it is used instead of the file specification prefix used for installation of executable  files
	      by  Xft  and  the  value	of  the  option argument specified with --prefix, if any, when compile and linker flags are reported (with
	      --cflags and --libs, respectively).

       --libs Report the linker flags that are required to link code that uses Xft symbols.

       --prefix[=local_prefix]
	      If specified without the parameter local_prefix, report the file specification prefix that Xft uses for installation of  files.	If
	      local_prefix  is	specified,  it is used instead of the file specification prefix used for installation of files by Xft when compile
	      and linker flags are reported (with --cflags and --libs, respectively); also see --exec-prefix.

       --version
	      Report the version of the Xft library installed on the system and exit.

OPERANDS

       xft-config does not recognize any non-option arguments.	At least one option must be specified.

EXIT STATUS

       0      Information was successfully reported.

       1      xft-config was invoked with invalid arguments, or no arguments at all.

AUTHOR

       xft-config was written by Keith Packard.  This manual page was written by Branden Robinson.

SEE ALSO

       Xft(3)

Xft								  Version 2.1.14						     xft-config(1)