Bug #41710: MySQL 5.1.30 crashes on the latest OpenSolaris 10

Change the default optimization level for Sun Studio to "-O1". 
This is a workaround for a Sun Studio bug (see bug #41710 
comments for details): 
 
1. Use $GCC instead of $ac_cv_prog_gcc to check for gcc, since 
the first one is the only documented way to do it. 
 
2. Use $GXX instead of $ac_cv_prog_cxx_g to check for g++, 
since the latter is set to "yes" when the C++ compiler accepts 
"-g" which is the case for both g++ and CC. 
 
3. When building with Sun Studio, set the default values for 
CFLAGS/CXXFLAGS to "-O1", since unlike GCC, Sun Studio 
interprets "-O" as "-xO3" (see the manual pages for cc and CC).

configure.in

@@ -1756,7 +1756,7 @@ esac
 
 # Build optimized or debug version ?
 # First check for gcc and g++
-if test "$ac_cv_prog_gcc" = "yes"
+if test "$GCC" = "yes"
 then
   DEBUG_CFLAGS="-g"
   DEBUG_OPTIMIZE_CC="-O"
@@ -1764,9 +1764,16 @@ then
 else
   DEBUG_CFLAGS="-g"
   DEBUG_OPTIMIZE_CC=""
-  OPTIMIZE_CFLAGS="-O"
+  case $SYSTEM_TYPE in                               
+    *solaris*)
+      OPTIMIZE_CFLAGS="-O1"
+      ;;
+    *)
+      OPTIMIZE_CFLAGS="-O"
+      ;;
+  esac
 fi
-if test "$ac_cv_prog_cxx_g" = "yes"
+if test "$GXX" = "yes"
 then
   DEBUG_CXXFLAGS="-g"
   DEBUG_OPTIMIZE_CXX="-O"
@@ -1774,7 +1781,14 @@ then
 else
   DEBUG_CXXFLAGS="-g"
   DEBUG_OPTIMIZE_CXX=""
-  OPTIMIZE_CXXFLAGS="-O"
+  case $SYSTEM_TYPE in
+    *solaris*)
+      OPTIMIZE_CXXFLAGS="-O1"
+      ;;
+    *)
+      OPTIMIZE_CXXFLAGS="-O"
+      ;;
+  esac
 fi
 
 if expr "$SYSTEM_TYPE" : ".*netware.*" > /dev/null; then