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xen-devel
Re: [Xen-devel] dynamic libraries
On 23 Feb 2005, at 21:28, Andrei Petrov wrote:
While looking at tools build I noticed that same object files are used
to build both
static and dynamic libraries (libxc, libxutil). It's normally required
to compile in
PIC form for dynamic ones. At first I thought that no applcations use
those libraries,
but no, they are used by all of them. Surprisingly it doens't cause
any problems (at
least nobody's complaining, ld.so even).
Well, anyway it doesn't look correct for me, I'd like to come up with
a patch
but it'll take some time, so I wouldn't mind if some Makefile savvy
beat me on it.
Short term solution would be always set -fPIC.
Well, we have the functionality in the build system already; it just
isn't the default.
Where is it stated that dynamic libraries must be compiled -fPIC? They
contain
relocation info and so can be relocated wherever needed at run time.
Potentially
less efficient (library relocated to different addresses cannot have
its text pages
shared across processes) but I don't see why it is *disallowed*.
If there's a suitably convincing explanation/reason then I will change
the default setting. :-)
-- Keir
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