bk commit into 4.1 tree (hartmut:1.2310) BUG#11065

['Hartmut Holzgraefe']

Below is the list of changes that have just been committed into a local
4.1 repository of hartmut. When hartmut does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2310 05/06/03 11:21:43 hartmut@stripped +1 -0
      check-cpu fixes/improvements (Bug #11065)
      
      - support additional platforms (OpenBSD, Darwin)
      - make use of /proc/cpuinfo CPU flag information
        (needed to distinguish EMT64 Xeons from normal ones)
      - chose the right CPU related options depending on 
        GCC version and target architecture
      - check if the chosen CPU type is actually supported
        by the GCC version , fallback to CPUs predecessor
        until test compile succeeds

  BUILD/check-cpu
    1.10 05/06/03 11:21:36 hartmut@stripped +126 -42
        check-cpu fixes/improvements (Bug #11065)
        
        - support additional platforms (OpenBSD, Darwin)
        - make use of /proc/cpuinfo CPU flag information
          (needed to distinguish EMT64 Xeons from normal ones)
        - chose the right CPU related options depending on 
          GCC version and target architecture
        - check if the chosen CPU type is actually supported
          by the GCC version , fallback to CPUs predecessor
          until test compile succeeds

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	hartmut
# Host:	dellschlepp.local
# Root:	/home/hartmut/projects/mysql/dev/4.1

--- 1.9/BUILD/check-cpu	2005-05-25 04:18:13 +02:00
+++ 1.10/BUILD/check-cpu	2005-06-03 11:21:36 +02:00
@@ -6,113 +6,197 @@
 #
 
 if test -r /proc/cpuinfo ; then
+  # on Linux (and others?) we can get detailed CPU information out of /proc
   cpuinfo="cat /proc/cpuinfo"
+
+  # detect CPU family
   cpu_family=`$cpuinfo | grep 'family' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`
   if test -z "$cpu_family" ; then
     cpu_family=`$cpuinfo | grep 'cpu' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`
   fi
+
+  # detect CPU vendor and model
   cpu_vendor=`$cpuinfo | grep 'vendor_id' | cut -d ':' -f 2 | cut -d ' ' -f 2 | head -1`
   model_name=`$cpuinfo | grep 'model name' | cut -d ':' -f 2 | head -1`
   if test -z "$model_name" ; then
     model_name=`$cpuinfo | grep 'cpu model' | cut -d ':' -f 2 | head -1`
   fi
+
+  # fallback: get CPU model from uname output
   if test -z "$model_name" ; then
     model_name=`uname -m`
   fi
+
+  # parse CPU flags
+  for flag in `$cpuinfo | grep 'flags' | sed -e 's/^flags.*: //'`; do 
+	eval cpu_flag_$flag=yes
+  done
 else
   # Fallback when there is no /proc/cpuinfo
   case "`uname -s`" in
-    FreeBSD)
+    FreeBSD|OpenBSD)
       cpu_family=`uname -m`;
-      model_name=`sysctl -b hw.model`
+      model_name=`sysctl -n hw.model`
+      ;;
+    Darwin)
+      cpu_family=`uname -p`
+      model_name=`machine`
       ;;
     *)
       cpu_family=`uname -m`;
-      model_name="unknown";
+      model_name=`uname -p`;
       ;;
   esac
 fi
 
-cpu_flag=""
-cpu_flag_old=""
+# detect CPU shortname as used by gcc options 
+# this list is not complete, feel free to add further entries
+cpu_arg=""
 
 case "$cpu_family--$model_name" in
+  # DEC Alpha
   Alpha*EV6*)
-    cpu_flag="ev6";
+    cpu_arg="ev6";
     ;;
+
+  # Intel ia32
   *Xeon*)
-    cpu_flag="nocona";
+    # a Xeon is just another pentium4 ...
+    # ... unless it has the "lm" (long-mode) flag set, 
+    # in that case it's a Xeon with EM64T support 
+	if [ -z "$cpu_flag_lm" ]; then
+      cpu_arg="pentium4";
+	else
+      cpu_arg="nocona";
+    fi
     ;;
-  *Pentium*4*Mobile*CPU*)
-    cpu_flag="pentium4m";
+  *Pentium*4*Mobile*)
+    cpu_arg="pentium4m";
   ;;
-  *Pentium*4*CPU*)
-    cpu_flag="pentium4";
+  *Pentium*4*)
+    cpu_arg="pentium4";
     ;;
-  *Pentium*III*Mobile*CPU*)
-    cpu_flag="pentium3m";
+  *Pentium*III*Mobile*)
+    cpu_arg="pentium3m";
   ;;
-  *Pentium*III*CPU*)
-    cpu_flag="pentium3";
+  *Pentium*III*)
+    cpu_arg="pentium3";
   ;;
   *Pentium*M*pro*)
-    cpu_flag="pentium-m";
-    cpu_flag_old="pentium";
+    cpu_arg="pentium-m";
   ;;
   *Athlon*64*)
-    cpu_flag="athlon64";
-    cpu_flag_old="athlon";
+    cpu_arg="athlon64";
     ;;
   *Athlon*)
-    cpu_flag="athlon";
+    cpu_arg="athlon";
     ;;
+
+  # Intel ia64
   *Itanium*)
     # Don't need to set any flags for itanium(at the moment)
-    cpu_flag="";
+    cpu_arg="";
     ;;
-  *ppc)
-    cpu_flag="powerpc";
-    no_march=1;
+
+  # 
+  *powerpc*)
+    cpu_arg=`echo $model_name | sed -e"s/ppc//g"`
     ;;
+
+  # unknown
   *)
-    cpu_flag="";
+    cpu_arg="";
     ;;
 esac
 
-if test -z "$cpu_flag"; then
+
+if test -z "$cpu_arg"; then
   echo "BUILD/check-cpu: Oops, could not findout what kind of cpu this machine is using."
-  check_cpu_flags=""
+  check_cpu_cflags=""
   return
 fi
 
-echo "cpu_flag: $cpu_flag"
-
+# different compiler versions have different option names
+# for CPU specific command line options
 if test -z "$CC" ; then
   cc="gcc";
 else
   cc=$CC
-
 fi
 
 cc_ver=`$cc --version | sed 1q`
 cc_verno=`echo $cc_ver | sed -e 's/[^0-9. ]//g;	 s/^ *//g; s/ .*//g'`
 
 case "$cc_ver--$cc_verno" in
-  *GCC*--3.4*|*GCC*--3.5*|*GCC*--4.*)
-    check_cpu_cflags="-mtune=$cpu_flag -march=$cpu_flag"
-    ;;
   *GCC*)
-    # Fix for older compiler versions
-    if test -n "$cpu_flag_old"; then
-      cpu_flag="$cpu_flag_old"
-    fi
-    check_cpu_cflags="-mcpu=$cpu_flag -march=$cpu_flag"
-    if test -n "$no_march"; then
-      check_cpu_cflags="-mcpu=$cpu_flag"
-    fi
+      # different gcc backends (and versions) have different CPU flags
+      case `gcc -dumpmachine` in
+        i?86-*)
+   	      case "$cc_verno" in
+		    3.4*|3.5*|4.*)
+			  check_cpu_args='-mtune=$cpu_arg -march=$cpu_arg'
+			  ;;
+		    *)
+			  check_cpu_args='-mcpu=$cpu_arg -march=$cpu_arg'
+			  ;;
+          esac
+          ;;
+        ppc-*)
+		  check_cpu_args='-mcpu=$cpu_arg -mtune=$cpu_arg'
+          ;;
+        *)
+          check_cpu_cflags=""
+          return
+          ;;
+      esac
+    ;;
+  2.95.*)
+    # GCC 2.95 doesn't expose its name in --version output
+    check_cpu_args='-m$cpu_arg'
     ;;
   *)
     check_cpu_cflags=""
+    return
     ;;
 esac
-echo $check_cpu_cflags
+
+# now we check whether the compiler really understands the cpu type
+touch __test.c
+
+while [ "$cpu_arg" ] ; do
+  echo -n testing $cpu_arg "... "
+	
+  # compile check
+  check_cpu_cflags=`eval echo $check_cpu_args`
+  if $cc -c $check_cpu_cflags __test.c 2>/dev/null; then
+	  echo ok
+      break;
+  fi
+
+  echo failed
+  check_cpu_cflags=""
+
+  # if compile failed: check whether it supports a predecessor of this CPU
+  # this list is not complete, feel free to add further entries
+  case "$cpu_arg" in
+    # Intel ia32
+    nocona)     cpu_arg=pentium4    ;; 
+    prescott)   cpu_arg=pentium4    ;;
+    pentium4m)  cpu_arg=pentium4    ;;
+    pentium4)   cpu_arg=pentium3    ;;
+    pentium3m)  cpu_arg=pentium3    ;;
+    pentium3)   cpu_arg=pentium2    ;;
+    pentium2)   cpu_arg=pentiumpro  ;;
+    pentiumpro) cpu_arg=pentium     ;;
+    pentium)    cpu_arg=i486        ;;
+    i486)       cpu_arg=i386        ;;
+
+	# power / powerPC
+	7450)       cpu_arg=7400        ;;
+
+    *)          cpu_arg=""          ;;
+  esac
+done
+
+rm __test.*
+