[nitrogen]

Here's one from one of the logs (http://clang.debian.net/logs/2012-01-12/libgtkada2_2.14.2-5_...):

  Building libgtkada.so.2.14.2
  cd obj-shared; x86_64-linux-gnu-gcc -shared -fPIC -Wl,--as-needed \
  	  -o libgtkada.so.2.14.2 -Wl,-soname,libgtkada.so.2.14.2 glib*.o gdk*.o \
  	  gtk*.o pango*.o misc.o misc_broken.o -lgtk-x11-2.0 -lgdk-x11-2.0 \
  	  -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 \
  	  -lgdk_pixbuf-2.0 -lcairo -lpango-1.0 -lfreetype \
  	  -lfontconfig -lgobject-2.0 -lgmodule-2.0 \
  	  -lgthread-2.0 -lrt -lglib-2.0   -lgnat -lX11
  Segmentation fault

In this case it looks like the compiler is crashing when invoking the linker (I'm assuming that x86_64-linux-gnu-gcc has been aliased to clang).

The others: http://clang.debian.net/status.php?version=3.0&key=SEG_F...