Avoid compiler warnings on powermacg5

Fixed compilation error when trying to compile libmysqld on powermac


configure.in:
  Added flag if __cxa_pure_virtual() should be defined.
  Without this flag, we get a warning from my_global.h for every compiled file on powermacg5
extra/yassl/taocrypt/include/type_traits.hpp:
  Avoid compiler warning
include/my_global.h:
  Avoid compiler warning on powermacg5
sql/mysqld.cc:
  Fix compiler error when compiling embedded on powermac

configure.in

@@ -1082,7 +1082,7 @@ case $SYSTEM_TYPE in
   *darwin6*)
     if test "$ac_cv_prog_gcc" = "yes"
     then
-      FLAGS="-D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -DHAVE_BROKEN_REALPATH"
+      FLAGS="-D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -DHAVE_BROKEN_REALPATH -DDONT_DECLARE_CXA_PURE_VIRTUAL "
       CFLAGS="$CFLAGS $FLAGS"
       CXXFLAGS="$CXXFLAGS $FLAGS"
       MAX_C_OPTIMIZE="-O"

extra/yassl/taocrypt/include/type_traits.hpp

@@ -69,7 +69,11 @@ MK_FUNDAMENTAL_TYPE(unsigned long)
 
 MK_FUNDAMENTAL_TYPE(float)
 MK_FUNDAMENTAL_TYPE(     double)
-MK_FUNDAMENTAL_TYPE(long double)
+
+#ifdef LONG_DOUBLE_IS_DISTINCT_TYPE
+// Don't define by default as this gives warnings on power mac
+    MK_FUNDAMENTAL_TYPE(long double)
+#endif
 
 #if defined(WORD64_AVAILABLE) && defined(WORD64_IS_DISTINCT_TYPE)
     MK_FUNDAMENTAL_TYPE(word64)

include/my_global.h

@@ -540,7 +540,7 @@ typedef unsigned short ushort;
   duplicate declaration of __cxa_pure_virtual, solved by declaring it a
   weak symbol.
 */
-#ifdef USE_MYSYS_NEW
+#if defined(USE_MYSYS_NEW) && ! defined(DONT_DECLARE_CXA_PURE_VIRTUAL)
 C_MODE_START
 int __cxa_pure_virtual () __attribute__ ((weak));
 C_MODE_END

sql/mysqld.cc

@@ -900,7 +900,7 @@ void kill_mysql(void)
 {
   DBUG_ENTER("kill_mysql");
 
-#ifdef SIGNALS_DONT_BREAK_READ
+#if defined(SIGNALS_DONT_BREAK_READ) && !defined(EMBEDDED_LIBRARY)
   abort_loop=1;					// Break connection loops
   close_server_sock();				// Force accept to wake up
 #endif