-D_REENTRANT -D_THREAD_SAFE -D_POSIX_PTHREAD_SEMANTICS
for all ports. It can't hurt if they are not supported, but it makes
our job easier for porting.
Should fix Darwin compile and other platforms without mucking with the
thread detection code.
Allow additional thread flags to be added via port templates.
Change thread flag names to PTHREAD_CFLAGS and PTHREAD_LIBS to match new
configure script.
(it rejects some system header files...). Use -no-cpp-precomp instead.
I think it is okay to change this unconditionally, but if we hear
complaints from people still using very old compilers on Darwin,
we could put in a test to see which switch the compiler likes.
As proof of concept, provide an alternate implementation based on POSIX
semaphores. Also push the SysV shared-memory implementation into a
separate file so that it can be replaced conveniently.
Bruce Hartzler <bruceh@mail.utexas.edu>. It contains shared library
support, regression test map, and the usual template files. The dynamic
loader is missing, the spin lock code apparently doesn't assemble due to
syntax problems, and semaphores are to be hoped for from Apple.
