Guard use of SIGILL probes on Apple platforms

crc-simd.cpp

@@ -75,6 +75,11 @@ bool CPU_ProbeCRC32()
     return result;
 #else
 
+# if defined(__APPLE__)
+    // No SIGILL probes on Apple platforms.
+    return false;
+# endif
+
     // longjmp and clobber warnings. Volatile is required.
     // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
     volatile bool result = true;

gcm-simd.cpp

@@ -221,6 +221,11 @@ bool CPU_ProbePMULL()
     return result;
 # else
 
+# if defined(__APPLE__)
+    // No SIGILL probes on Apple platforms. Plus, Apple Clang does not have PMULL intrinsics.
+    return false;
+# endif
+
     // longjmp and clobber warnings. Volatile is required.
     // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
     volatile bool result = true;

rijndael-simd.cpp

@@ -98,6 +98,11 @@ bool CPU_ProbeAES()
 	return result;
 # else
 
+# if defined(__APPLE__)
+    // No SIGILL probes on Apple platforms.
+    return false;
+# endif
+
 	// longjmp and clobber warnings. Volatile is required.
 	// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
 	volatile bool result = true;

sha-simd.cpp

@@ -84,6 +84,11 @@ bool CPU_ProbeSHA1()
     return result;
 # else
 
+# if defined(__APPLE__)
+    // No SIGILL probes on Apple platforms.
+    return false;
+# endif
+
     // longjmp and clobber warnings. Volatile is required.
     // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
     volatile bool result = true;
@@ -143,6 +148,11 @@ bool CPU_ProbeSHA2()
     return result;
 #else
 
+# if defined(__APPLE__)
+    // No SIGILL probes on Apple platforms.
+    return false;
+# endif
+
     // longjmp and clobber warnings. Volatile is required.
     // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
     volatile bool result = true;