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From: schorr@ead.dsa.com (Andrew J. Schorr)
Newsgroups: comp.unix.aix
Subject: Making shared libraries
Message-ID: <1990Oct11.160027@ead.dsa.com>
Date: 11 Oct 90 20:00:27 GMT
Sender: news@ead.dsa.com
Reply-To: schorr@ead.dsa.com (Andrew J. Schorr)
Organization: Daiwa Securities America, New York
Lines: 33

My question is simple: how do you make shared libraries?
As I understand it, the process is as follows:

  1. compile the source into .o files as you would normally;
     are there any special compiler flags required here?
     I don't seem to see anything analogous to -pic on a Sun.

  2. create an export list for the library;
     I'm using nm to make it automatically as follows:
	nm -g {object files} | \
	awk '$(NF-1) == "D" {print $NF}' > export.list

  3. link the .o files into a shared object as follows:
	ld -r -o shared_object.o {object files} -bE:export.list \
		-bM:SRE -T512 -H512

  4. insert the resulting shared_object.o into an archive (if so desired)

Everything seems to work, but when I run a program linked against
the library, I get the following messages:

   Could not load program test_program 
   Could not load library libtest.0.1.a[shared_object.o]
   Error was: No such file or directory

Apparently, the loader can't find the library at run-time.  How
do you tell it where to look?  It seems that this might involve
putting a special line in the export.list that starts with #!, 
but I'm not sure exactly.  Can someone help me?  The ld man page
is very vague on this subject.

Thanks in advance,
Andy