detecting non-PIC in shared lib on Darwin?

[Jack Howarth]

   I recall that the Debian folks proposed a method of detecting non-PIC
code in their shared libs using...

readelf -d foo.so | grep TEXTREL

Does anyone know if some mechanism like this is possible for Darwin
shared libraries? I ask because we just discovered that the gmp developers
have been building non-PIC code (due to the usage of -fast without -fPIC)
in the MacOS X builds. It would be nice to be able to check for the non-PIC
code in all the shared libs on MacOS X. Thanks in advance for any info.
         Jack