Libtool and Support for Shared Libraries (3)

[Дилян Палаузов]

Hello,

concerning the rpath for the perl shared objects IMAP.so and 
managesieve.so, after all I found that MakeMaker uses as linker by 
default the value returned by $Config(ld) (visible by running perl -V 
under Linker and Libraries), which is sometimes "ld='cc'" and sometimes 
"ld='ld'".

If I do not overwrite the default LD-variable (<=> $config(ld)), then it 
might be "cc", which could be gcc or not.  I have no idea how to pass 
linker flags, if the linker is "cc", but not "gcc" (with gcc the 
parameters are passed with -Wl,param).  So on the one side, I do not 
know how to instruct $config(ld)/the linker in a portable way by passing 
-rpath parameters to include rpath in the .so file.

On the other side, at least gnu ld, considers the variable LD_RUN_PATH, 
when there are no -rpath parameters passed to it and included the value 
of LD_RUN_PATH as rpath in the generated shared object.  This is how I 
understand the documentation of -rpath in gnu ld:

Options:
[...]
-rpath=DIR ... If `-rpath' is not used when linking an ELF executable, 
the contents of the environment variable `LD_RUN_PATH' will be used if 
it is defined.

MakeMaker does set LD_RUN_PATH, before invoking the linker.  This leads 
to including rpath=$(libdir) in perl/imap/IMAP.so and 
perl/sieve/managesieve/managesieve.so .  At least this is the logic on 
my system.  If on other systems the rpath is not included in IMAP.so or 
managesieve.so, and LD_RUN_PATH in the resulting perl/imap/Makefile is 
set up properly, I cannot say where the problem is.

The discussion with RPATH is only about the perl shared objects.  The 
other executables and shared libraries have correct RPATH.

With DISTDIR I meant DESTDIR.

About the libtool warnings that come when using DESTDIR, they might be 
suppressed by passing --no-verbose or --quiet to libtool, however it 
might cause other useful warning to disappear and I guess it cannot be 
passed to libtool only in install-mode, but has to be in the compile 
mode, too (if it is managed by Automake).

Със здраве
   Дилян
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