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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gmtlogo

GMTLOGO(1gmt)						       Generic Mapping Tools						     GMTLOGO(1gmt)

NAME

       gmtlogo - Adding a GMT graphics logo overlay to an illustration

SYNOPSIS

       gmtlogo dx dy [ -Gfill ] [ -W[pen] ] >> plot.ps

DESCRIPTION

       This  scrips  appends the GMT logo to an "open" PostScript file.  The logo is 2 inches wide and 1 inch high and will be positioned with the
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   SPECIFYING FILL
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SEE ALSO

       GMT(1), gmtcolors(5), psimage(1)

GMT 4.5.7							    15 Jul 2011 						     GMTLOGO(1gmt)