[PATCH-v2] powerpc: Automatic CPU detection in preconfigure

[Carlos Eduardo Seo]

Added a check to detect the CPU value in preconfigure, so that glibc is 
built with the correct --with-cpu value. This is only done for Power 
servers.

This should address the sort issue pointed by Andreas.

Thanks,

-- 
Carlos Eduardo Seo
Software Engineer - Linux on Power Toolchain
cseo@linux.vnet.ibm.com
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From 5701add1ec981bbf10819a70c063e89eef2e8c2c Mon Sep 17 00:00:00 2001
From: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Date: Sun, 15 Nov 2015 19:31:30 -0200
Subject: [PATCH] powerpc: Automatic CPU detection in preconfigure

Added a check to detect the CPU value in preconfigure, so that glibc is built
with the correct --with-cpu value. This is only done for Power servers.

2016-04-07  Carlos Eduardo Seo  <cseo@linux.vnet.ibm.com>

	* sysdeps/powerpc/preconfigure: Added a check to identify the CPU value
	and set it for the --with-cpu configure parameter.
---
 sysdeps/powerpc/preconfigure | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/sysdeps/powerpc/preconfigure b/sysdeps/powerpc/preconfigure
index 0c6fdde..b0e036c 100644
--- a/sysdeps/powerpc/preconfigure
+++ b/sysdeps/powerpc/preconfigure
@@ -15,3 +15,35 @@ powerpc*)
   rm -f conftest.i
   ;;
 esac
+
+# Lets ask the compiler which Power processor we've got, in case the user did
+# not choose a --with-cpu value.
+# Note if you add patterns here you must ensure that an appropriate directory
+# exists in sysdeps/powerpc
+if test -z "$with_cpu"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: --with-cpu not set. Trying to detect CPU." >&5
+    $as_echo "$as_me: --with-cpu not set. Trying to detect CPU." >&6;}
+  archcpu=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null |
+	   grep "#define _ARCH_PWR" | sed "s/^.*PWR//" | sed "s/ 1$//" |
+	   sort -nr | head -n 1 | sed "s/^/_ARCH_PWR/"
+
+# Set --with-cpu as appropriate.
+  case "$archcpu" in
+  _ARCH_PWR5X)
+    submachine="power5+"
+    { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+      $as_echo "$as_me:  CPU identified as $submachine" >&6;}
+    ;;
+  _ARCH_PWR*)
+  submachine=`echo $archcpu | sed "s/_ARCH_PWR/power/" |
+	      tr '[:upper:]' '[:lower:]'`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+      $as_echo "$as_me:  CPU identified as $submachine" >&6;}
+    ;;
+  *)
+  submachine=""
+    { $as_echo "$as_me:${as_lineno-$LINENO}: CPU not identified; using default" >&5
+      $as_echo "$as_me:  CPU not identified; using default" >&6;}
+    ;;
+  esac
+fi
-- 
2.6.4 (Apple Git-63)