Hi John,
thanks for looking into the problem.
On Tue, 21 Mar 2017 02:22:11 +0100
John Darrington <j...@darrington.wattle.id.au> wrote:
> + (arguments `(#:configure-flags '("LDFLAGS=-lpthread")))
Hmm, that seems to be a very unsafe thing to do.
In order to actually use pthread, one has to switch gcc into pthread mode
(which influences how it handles variables etc).
But just passing "-lpthread" to the linker does no such things and will only
make it link - with the wrong actual instructions in the object files!
Also, even if it worked - by chance -, that seems like papering over the
problem.
It would be better to check out the object files (with objdump -r or objdump
-t) and find out where the symbol is listed as undefined ("U"). Then check the
associated source file whether it actually intended to use pthread.
Pthread is not exactly a modular library that you can just switch on and off at
will.
