configure fails to detect gcc intrinsic for me. Example:
TEST_BUILTIN(__builtin_clz, 23)
will generate
configure:61584: checking for __builtin_clz
configure:61608: /home/nilsson/pike/build/linux-3.19.0-25-generic-x86_64/smartlink gcc -o conftest -g -fvisibility=hidden -O3 -pipe -ggdb -fvar-tracking-assignments -funswitch-loops -m64 -mrdrnd conftest.c >&5
configure:61608: $? = 0
configure:61618: result: 9961pike_cv_builtin___builtin_clz
I.e. one level too much quoting. I'm not sure what the correct
portable fix is though.
