Clang feature branch #72
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Builds on FreeBSD 11.2 with clang 6. Output from ffts_test:
Sign | Size | L2 Error
------+-----------+-------------
-1 | 2 | 8.659561E-17
-1 | 4 | 1.145552E-16
-1 | 8 | 1.210162E-08
-1 | 16 | 2.220916E-08
-1 | 32 | 2.396272E-08
-1 | 64 | 2.272872E-08
-1 | 128 | 1.940460E-08
-1 | 256 | 2.081312E-08
-1 | 512 | 2.045939E-08
-1 | 1024 | 2.079071E-08
-1 | 2048 | 2.074052E-08
-1 | 4096 | 2.124981E-08
-1 | 8192 | 2.086463E-08
-1 | 16384 | 2.071494E-08
-1 | 32768 | 2.062090E-08
-1 | 65536 | 2.054694E-08
-1 | 131072 | 2.060355E-08
-1 | 262144 | 2.054523E-08
1 | 2 | 8.659561E-17
1 | 4 | 1.145552E-16
1 | 8 | 1.210162E-08
1 | 16 | 2.220916E-08
1 | 32 | 2.396272E-08
1 | 64 | 2.272872E-08
1 | 128 | 1.940460E-08
1 | 256 | 2.081312E-08
1 | 512 | 2.045939E-08
1 | 1024 | 2.079071E-08
1 | 2048 | 2.074052E-08
1 | 4096 | 2.124981E-08
1 | 8192 | 2.086463E-08
1 | 16384 | 2.071494E-08
1 | 32768 | 2.062090E-08
1 | 65536 | 2.054694E-08
1 | 131072 | 2.060355E-08
1 | 262144 | 2.054523E-08