Another one that's interesting in a morbid sort of way...

libtool: compile: /usr/local/bin/scan-build/ccc-analyzer -DHAVE_CONFIG_H -I.
-I.. -I../src -I../src -I/usr/local/include -g3 -O1 -fvisibility=hidden -Wall
-MT seed.lo -MD -MP -MF .deps/seed.Tpo -c seed.c -o seed.o

seed.c:348:3: warning: The right operand of '^' is a garbage value

OP (x1, x2, x3, x4, 0);
^~~~~~~~~~~~~~~~~~~~~~

seed.c:324:15: note: expanded from macro 'OP'

t0.w = X3 ^ ctx->keyschedule[rbase];                        \
          ^ ~~~~~~~~~~~~~~~~~~~~~~~

1 warning generated.