AT&T UNIX™PC Unix System V Users Manual - tenox

SHLill ( 4) (AT&T UNIX PC only ) SHLill ( 4)
NAME
shlib - shared library
DESCRIPTION
UNIX PC UNIX supports a shared library. Its use results in
significantly smaller programs, reduced startup times, and better
runtime performance. This is accomplished by loading the library
with the first program that invokes it. The library is then shared
with subsequent programs. Once loaded, the library remains in
place until the system is reset.
The shared library contains all the routines traditionally loaded by
-lc, -ltam, and -ltermlib .
Use of the shared library requires a change to the makefiles.
Source code remains unchanged. The typical makefile link-load
line is
FILES
or
$(LD) $(LDFLAGS) -o target objects -lc -!tam -ltermlib
$(CC) $(LDFLAGS) -o target objects -!tam -ltermlib
should be replaced with
$(LD) $(LDFLAGS) $(SHAREDLIB) -o target objects
where target is the executable and objects are the files with the .o
suffixes. $(SHAREDLIB) is defined in $(MA.KEINC)/Makepre.h.
/lib/shlib
/lib /shlib.ifile
/lib/crtos.o
SEE ALSO
cc(l), ld(l).
BUGS
Programs that redefine symbols in the shared library cannot use it
and must rename the conflicting symbols.
A shared library subroutine cannot contain a breakpoint.
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