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Re: emacs 21.3 wants "libXaw3d.so.5"; got Xaw3d-1.5.tar.gz; NOW WHAT?
From: |
Kai Großjohann |
Subject: |
Re: emacs 21.3 wants "libXaw3d.so.5"; got Xaw3d-1.5.tar.gz; NOW WHAT? |
Date: |
Mon, 26 May 2003 08:57:35 +0200 |
User-agent: |
Gnus/5.1003 (Gnus v5.10.3) Emacs/21.3.50 (gnu/linux) |
dkcombs@panix.com (David Combs) writes:
> Now, on that other thread, there has been SO MUCH back- and-forth
> about the args, one saying "add this -R xxx" and the followup saying
> eg ~~ "no, no, no -- don't do that! It won't work!" -- please, for
> me, and for the eventual writeup that I promised:
>
> (1) exactly what arg for the -L? (and why)
The argument for -L should be where the library lives. So if you
want to include the library /opt/some_package/lib/libfoo.so, then you
should add -L/opt/some_package/lib.
-L tells the linker to look in that directory when constructing the
executable.
> (2) ditto for the -R.
The argument for -R should be the same as for -L. -R tells the
executable where to find its libraries when running.
When -R is not specfied, the executable (the loader, actually) will
look in the directories listed in $LD_LIBRARY_PATH. I'm not sure
whether the linker will also look there or only in -L.
> (3) Something to pre-answer a "no no no!" kind of followup.
The obvious alternative, to me, would be to specify the directory via
$LD_LIBRARY_PATH when the executable is run. So what you could do is
to use -L to specify a directory for the linker, and then each user
can use $LD_LIBRARY_PATH to choose the directory when running.
This way, you could specify -L/foo/1.4/lib but later on, when a new
version of foo is released, you could change $LD_LIBRARY_PATH from
/foo/1.4/lib to /foo/1.5/lib and then the executable would use the
new library.
> (4) (I assume there's more than one way to successfully
> build this new Emacs -- or is there essentially only
> ONE way?)
There are advantages for the -R solution (always finds the library
that Emacs was built with) and also for the $LD_LIBRARY_PATH solution
(can use bugfixed library without recompiling Emacs).
My personal opinion is that it is safer to use -R because strange
problems may arise when run Emacs with a different library (version)
than it was built with. If the bugfix from the new library version
is really needed, it is easy enough to build Emacs again.
> (5) What is it that makes this 21.3 (or just 21.x?)
> more difficult, more understanding needed, than
> 20.x, 19.x?
Emacs 21 uses more external libraries, for displaying images for
instance.
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- Re: emacs 21.3 wants "libXaw3d.so.5"; got Xaw3d-1.5.tar.gz; NOW WHAT?, (continued)
Re: emacs 21.3 wants "libXaw3d.so.5"; got Xaw3d-1.5.tar.gz; NOW WHAT?, Kai Großjohann, 2003/05/22