Creating and Using Libraries

Creating Archive Libraries

$ ar tv libunits.a

 

 

 

 

 

 

rw-rr

265/

20

230

Feb

2

17:19 1990

length.o

rw-rr

265/

20

228

Feb

2

16:25

1990

mass.o

rw-rr

265/

20

230

Feb

2

16:24

1990

volume.o

The next example replaces length.o in libunits.a, only if length.o is more recent than the one already contained in libunits.a:

$ ar ru libunits.a length.o

crt0.o

In 64-bit mode, the crt0.o startup file is not needed for shared bound links because dld.sl does some of the startup duties previously done by crt0.o. You still need to include crt0.o on the link line for all fully archive links (ld -noshared). In 32-bit mode, crt0.o must always be included on the link line.

Users who link by letting the compilers such as cc invoke the linker do not have include crt0.o on the link line.

Archive Library Location

After creating an archive library, you will probably want to save it in a location that is easily accessible to other programmers who might want to use it. There are two main choices for places to put the library:

in the 32-bit /usr/libor 64-bit /user/lib/pa20_64directory

in the 32-bit /usr/local/lib or /usr/contrib/lib directory

Using /usr/lib and /usr/lib/pa20_64

Since the linker searches /usr/lib or /usr/lib/pa20_64 by default, you might want to put your archive libraries there. You would eliminate the task of entering the entire library path name each time you compile or link.

The drawbacks of putting the libraries in /usr/lib or /usr/lib/pa20_64 are:

You usually need super-user (system administrator) privileges to write to the directory.

You could overwrite an HP-UX system library that resides in the directory.

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Chapter 5

Page 136
Image 136
Kenwood HP 9000 manual Crt0.o, Archive Library Location, Using /usr/lib and /usr/lib/pa2064, 136

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