skip gxhash on AES missing

Fixes GH #304

CMakeLists.txt

@@ -520,6 +520,10 @@ else()
   set(T1HA_SRC t1ha/t1ha0.c t1ha/t1ha1.c t1ha/t1ha2.c)
 endif(AES_FOUND AND (PROCESSOR_FAMILY STREQUAL "Intel"))
 
+if(AES_FOUND)
+  set(GX_SRC gxhash.c)
+endif(AES_FOUND)
+
 if(SHA_FOUND)
   # todo: arm, power
   set(SHA_SRC SHA-Intrinsics/sha1-x86.c SHA-Intrinsics/sha256-x86.c)
@@ -696,7 +700,7 @@ add_library(
   beamsplitter.cpp
   discohash_512.cpp
   xxhash.c
-  gxhash.c
+  ${GX_SRC}
   metrohash/metrohash64.cpp
   metrohash/metrohash128.cpp
   cmetrohash64.c

README.md

@@ -227,7 +227,7 @@ SMhasher
 | [k-hashv64](doc/k-hashv64.txt)                |      9251.05 |    51.72 | 251.83 (2) |1279 |                            |
 | [komihash](doc/komihash.txt)                  |     12179.74 |    33.23 | 224.80 (2) |1323 |                            |
 | [polymur](doc/polymur.txt)                    |      9913.53 |    41.68 | 232.56 (3) |1128 |                            |
-| [gxhash64](doc/gxhash64.txt)                  |     48919.73 |    36.61 | 236.98 (3) |     |                            |
+| [gxhash64](doc/gxhash64.txt)                  |     48919.73 |    36.61 | 236.98 (3) |     | AES only                   |
 
 The sortable table variants:
 

main.cpp

@@ -676,7 +676,9 @@ HashInfo g_hashes[] =
 { farmhash64_c_test,    64, FARM64_VERIF, "farmhash64_c",  "farmhash64_with_seed (C99)", GOOD, {} },
 { farmhash128_c_test,  128, FARM128_VERIF,"farmhash128_c", "farmhash128_with_seed (C99)", GOOD, {} },
 #endif
-{ gxhash64_test,        64, 0x9189E456, "gxhash64",    "gxHash, 64-bit", GOOD, {} },
+#ifdef HAVE_AESNI
+{ gxhash64_test,        64, 0x9189E456, "gxhash64",    "gxHash, 64-bit, AES-only", GOOD, {} },
+#endif
 { xxHash64_test,        64, 0x024B7CF4, "xxHash64",    "xxHash, 64-bit", GOOD, {} },
 #if 0
 { xxhash256_test,       64, 0x024B7CF4, "xxhash256",   "xxhash256, 64-bit unportable", GOOD, {} },