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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
Old 01-18-2020
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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COLORS(3)						   libbash colors Library Manual						 COLORS(3)

NAME
colors -- libbash library for setting tty colors. SYNOPSIS
colorSet <color> colorReset colorPrint [<indent>] <color> <text> colorPrintN [<indent>] <color> <text> DESCRIPTION
General colors is a collection of functions that make it very easy to put colored text on tty. The function list: colorSet Sets the color of the prints to the tty to COLOR colorReset Resets current tty color back to normal colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline) colorPrintN The same as colorPrint, but trailing newline is added Detailed interface description follows. Available colors: Green Red Yellow White The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red). FUNCTIONS DESCRIPTIONS
colorSet <color> Sets the current printing color to color. colorReset Resets current tty color back to normal. colorPrint [<indent>] <color> Prints text using the color color indented by indent (without adding a newline). Parameters: <indent> The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position. <color> The color to use. <color> The text to print. colorPrintN [<indent>] <color> The same as colorPrint, except a trailing newline is added. EXAMPLES
Printing a green 'Hello World' with a newline: Using colorSet: $ colorSet green $ echo 'Hello World' $ colorReset Using colorPrint: $ colorPrint 'Hello World'; echo Using colorPrintN: $ colorPrintN 'Hello World' AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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