[PATCH] powerpc: Automatically guess --with-cpu value

[Carlos Eduardo Seo]

Hi

This patch adds a check to preconfigure for Power architecture to 
automatically guess the --with-cpu value for Power server processors.

Regards,

-- 
Carlos Eduardo Seo
Software Engineer - Linux on Power Toolchain
cseo@linux.vnet.ibm.com

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From 198e0422a1ab902fc2fd537c61ece39d9ec88405 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.

2015-11-15  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 | 51 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/sysdeps/powerpc/preconfigure b/sysdeps/powerpc/preconfigure
index 0c6fdde..ada7b0c 100644
--- a/sysdeps/powerpc/preconfigure
+++ b/sysdeps/powerpc/preconfigure
@@ -15,3 +15,54 @@ powerpc*)
   rm -f conftest.i
   ;;
 esac
+
+# Lets ask the compiler which Power processor we've got. 
+# Note if you add patterns here you must ensure that an appropriate directory
+# exists in sysdeps/powerpc
+archcpu=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null |
+	 sed -n 's/^#define \(_ARCH_PWR[0-9].*\) .*$/\1/p' |
+	 sort -r | head -n 1`
+
+# Set --with-cpu as appropriate.
+case "$archcpu" in
+_ARCH_PWR8)
+  submachine="power8"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+$as_echo "$as_me:  CPU identified as $submachine" >&6;}
+  ;;
+_ARCH_PWR7)
+  submachine="power7"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+$as_echo "$as_me:  CPU identified as $submachine" >&6;}
+  ;;
+_ARCH_PWR6X)
+  submachine="power6x"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+$as_echo "$as_me:  CPU identified as $submachine" >&6;}
+  ;;
+_ARCH_PWR6)
+  submachine="power6"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+$as_echo "$as_me:  CPU identified as $submachine" >&6;}
+  ;;
+_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_PWR5)
+  submachine="power5"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: CPU identified as $submachine" >&5
+$as_echo "$as_me:  CPU identified as $submachine" >&6;}
+  ;;
+_ARCH_PWR4)
+  submachine="power4"
+  { $as_echo "$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
-- 
2.4.9 (Apple Git-60)