[patches] -march glibc upstream patch from Roland McGrath

["Andreas Krebbel" <krebbel@xxxxxxxxxxxxxxxxxx>]

Hello,

Roland applied a different patch for enabling use of -march during
libc build.

I've extracted the patch from the upstream CVS and tested it in
combination with my other patches.

Please apply to eglibc and DFP branch and regenerate the configure
file.

Bye,

-Andreas-


2008-08-18  Roland McGrath  <roland@xxxxxxxxxx>
	
	* configure.in (--with-cpu): Check compiler support for -march/-mcpu.
	* config.make.in (cflags-cpu): New substituted variable.
	(with-cpu): Variable removed.
	* Makeconfig (+cflags): Use $(cflags-cpu), not $(with-cpu).

Index: configure.in
===================================================================
--- configure.in.orig	2008-08-18 12:38:38.000000000 +0200
+++ configure.in	2008-08-18 12:39:48.000000000 +0200
@@ -355,7 +355,6 @@ AC_ARG_WITH([cpu],
   esac
 ])
 
-
 # An add-on can set this when it wants to disable the sanity check below.
 libc_config_ok=no
 
@@ -1996,6 +1995,22 @@ EOF
   fi
 fi
 
+if test -n "$submachine"; then
+  AC_CACHE_CHECK([for compiler option for CPU variant],
+  		 libc_cv_cc_submachine, [dnl
+  libc_cv_cc_submachine=no
+  for opt in "-march=$submachine" "-mcpu=$submachine"; do
+    if AC_TRY_COMMAND([${CC-cc} $opt -xc /dev/null -S -o /dev/null]); then
+      libc_cv_cc_submachine="$opt"
+      break
+    fi
+  done])
+  if test "x$libc_cv_cc_submachine" = xno; then
+    AC_MSG_ERROR([${CC-cc} does not support $submachine])
+  fi
+fi
+AC_SUBST(libc_cv_cc_submachine)
+
 dnl Check whether we have the gd library available.
 AC_MSG_CHECKING(for libgd)
 if test "$with_gd" != "no"; then
Index: config.make.in
===================================================================
--- config.make.in.orig	2008-08-18 12:38:38.000000000 +0200
+++ config.make.in	2008-08-18 12:39:48.000000000 +0200
@@ -31,7 +31,7 @@ base-machine = @base_machine@
 config-vendor = @host_vendor@
 config-os = @host_os@
 config-sysdirs = @sysnames@
-with-cpu = @submachine@
+cflags-cpu = @libc_cv_cc_submachine@
 
 defines = @DEFINES@
 sysincludes = @SYSINCLUDES@
Index: Makeconfig
===================================================================
--- Makeconfig.orig	2008-08-18 12:38:38.000000000 +0200
+++ Makeconfig	2008-08-18 12:39:48.000000000 +0200
@@ -651,7 +651,7 @@ ifeq	"$(strip $(+cflags))" ""
 +cflags	:= $(default_cflags)
 endif	# $(+cflags) == ""
 
-+cflags += $(addprefix -mcpu=,$(with-cpu)) $(+gccwarn) $(+merge-constants)
++cflags += $(cflags-cpu) $(+gccwarn) $(+merge-constants)
 +gcc-nowarn := -w
 
 # Don't duplicate options if we inherited variables from the parent.