Can someone take a look at ports/143723 (graphics/libdrm fails to install some files)?

[John Hein]

Vitaly Magerya wrote at 14:11 +0300 on Jun  2, 2010:
 > PR ports/143723 [1] was closed with originator timeout, but the bug is
 > still present, a number of people can reproduce it, a workaround is
 > present and I will provide any further feedback needed (I already sent
 > my logs there).
 > 
 > Can someone take a look at at? At least reopening it would be a start.
 > 
 > I mailed the committer who closed it (nork@), but no response so far.
 > 
 > [1] http://www.freebsd.org/cgi/query-pr.cgi?pr=143723

It happens for me on 7.2-RELEASE, but not on 7.2-stable from the
end of April.

The problem boils down to this test done by the configure
script:

% cat foo.c
int atomic_add(int i) { return __sync_fetch_and_add (&i, 1); }
int atomic_cmpxchg(int i, int j, int k) { return __sync_val_compare_and_swap (&i, j, k); }

int
main ()
{
  return 0;
}

On 7.2-RELEASE, I get:

conftest.o(.text+0x15): In function `atomic_add':
: undefined reference to `__sync_fetch_and_add_4'
conftest.o(.text+0x3b): In function `atomic_cmpxchg':
: undefined reference to `__sync_val_compare_and_swap_4'

That causes the 'checking for native atomic primitives' in
the configure script to fail.

I haven't yet tracked down which difference between 7.2-RELEASE
and 7-stable causes this.