config.host (alpha*-*-linux*): Use driver-alpha.o and alpha/x-alpha.

2009-03-24  Arthur Loiret  <aloiret@debian.org>

	* config.host (alpha*-*-linux*): Use driver-alpha.o and
	alpha/x-alpha.
	* config/alpha/linux.h (host_detect_local_cpu): Declare, add to
	EXTRA_SPEC_FUNCTIONS.
	(MCPU_MTUNE_NATIVE_SPECS, DRIVER_SELF_SPECS): New macros.
	* config/alpha/driver-alpha.c, config/alpha/x-alpha: New.
	* doc/invoke.texi (DEC Alpha Options): Document 'native' value for
	-march and -mtune options.

From-SVN: r145028

gcc/ChangeLog

@@ -1,3 +1,14 @@
+2009-03-24  Arthur Loiret  <aloiret@debian.org>
+
+	* config.host (alpha*-*-linux*): Use driver-alpha.o and
+	alpha/x-alpha.
+	* config/alpha/linux.h (host_detect_local_cpu): Declare, add to
+	EXTRA_SPEC_FUNCTIONS.
+	(MCPU_MTUNE_NATIVE_SPECS, DRIVER_SELF_SPECS): New macros.
+	* config/alpha/driver-alpha.c, config/alpha/x-alpha: New.
+	* doc/invoke.texi (DEC Alpha Options): Document 'native' value for
+	-march and -mtune options.
+
 2009-03-24  Ralf Corsépius <ralf.corsepius@rtems.org>
 
 	* config/m68k/t-rtems: Add m5329 multilib.

gcc/config.host

@@ -94,6 +94,14 @@ case ${host} in
 esac
 
 case ${host} in
+  alpha*-*-linux*)
+    case ${target} in
+      alpha*-*-linux*)
+	host_extra_gcc_objs="driver-alpha.o"
+	host_xmake_file="${host_xmake_file} alpha/x-alpha"
+	;;
+    esac
+    ;;
   i[34567]86-*-* \
   | x86_64-*-* )
     case ${target} in
@@ -112,9 +120,6 @@ case ${host} in
       ;;
     esac
     ;;
-esac
-
-case ${host} in
   rs6000-*-* \
   | powerpc*-*-* )
     case ${target} in

gcc/config/alpha/driver-alpha.c

@@ -0,0 +1,100 @@
+/* Subroutines for the gcc driver.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Contributed by Arthur Loiret <aloiret@debian.org>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+
+/* This will be called by the spec parser in gcc.c when it sees
+   a %:local_cpu_detect(args) construct.  Currently it will be called
+   with either "cpu" or "tune" as argument depending on if -mcpu=native
+   or -mtune=native is to be substituted.
+
+   It returns a string containing new command line parameters to be
+   put at the place of the above two options, depending on what CPU
+   this is executed.  E.g. "-mcpu=ev6" on an Alpha 21264 for
+   -mcpu=native.  If the routine can't detect a known processor,
+   the -mcpu or -mtune option is discarded.
+
+   ARGC and ARGV are set depending on the actual arguments given
+   in the spec.  */
+const char *
+host_detect_local_cpu (int argc, const char **argv)
+{
+  const char *cpu = NULL;
+  char buf[128];
+  FILE *f;
+
+  static const struct cpu_names {
+   const char *const name;
+   const char *const cpu;
+  } cpu_names[] = {
+    { "EV79",	"ev67" },
+    { "EV7",	"ev67" },
+    { "EV69",	"ev67" },
+    { "EV68CX",	"ev67" },
+    { "EV68CB",	"ev67" },
+    { "EV68AL",	"ev67" },
+    { "EV67",	"ev67" },
+    { "EV6",	"ev6" },
+    { "PCA57",	"pca56" },
+    { "PCA56",	"pca56" },
+    { "EV56",	"ev56" },
+    { "EV5",	"ev5" },
+    { "LCA45",	"ev45" },
+    { "EV45",	"ev45" },
+    { "LCA4",	"ev4" },
+    { "EV4",	"ev4" },
+/*  { "EV3",	"ev3" },  */
+    { 0, 0 }
+  };
+
+  int i;
+
+  if (argc < 1)
+    return NULL;
+
+  if (strcmp (argv[0], "cpu") && strcmp (argv[0], "tune"))
+    return NULL;
+
+  f = fopen ("/proc/cpuinfo", "r");
+  if (f == NULL)
+    return NULL;
+
+  while (fgets (buf, sizeof (buf), f) != NULL)
+    if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
+      {
+        for (i = 0; cpu_names [i].name; i++)
+          if (strstr (buf, cpu_names [i].name) != NULL)
+	    {
+	      cpu = cpu_names [i].cpu;
+	      break;
+	    }
+	break;
+      }
+
+  fclose (f);
+
+  if (cpu == NULL)
+    return NULL;
+
+  return concat ("-m", argv[0], "=", cpu, NULL);
+}

gcc/config/alpha/linux.h

@@ -85,3 +85,19 @@ along with GCC; see the file COPYING3.  If not see
 
 /* Define if long doubles should be mangled as 'g'.  */
 #define TARGET_ALTERNATE_LONG_DOUBLE_MANGLING
+
+/* -mcpu=native handling only makes sense with compiler running on
+   an Alpha chip.  */
+#if defined(__alpha__) || defined(__alpha)
+extern const char *host_detect_local_cpu (int argc, const char **argv);
+# define EXTRA_SPEC_FUNCTIONS						\
+  { "local_cpu_detect", host_detect_local_cpu },
+
+# define MCPU_MTUNE_NATIVE_SPECS					\
+   " %{mcpu=native:%<mcpu=native %:local_cpu_detect(cpu)}"		\
+   " %{mtune=native:%<mtune=native %:local_cpu_detect(tune)}"
+#else
+# define MCPU_MTUNE_NATIVE_SPECS ""
+#endif
+
+#define DRIVER_SELF_SPECS MCPU_MTUNE_NATIVE_SPECS

gcc/config/alpha/x-alpha

@@ -0,0 +1,3 @@
+driver-alpha.o: $(srcdir)/config/alpha/driver-alpha.c \
+  $(CONFIG_H) $(SYSTEM_H)
+	$(CC) -c $(ALL_CFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<

gcc/doc/invoke.texi

@@ -10212,11 +10212,21 @@ Schedules as an EV6 and supports the BWX, FIX, and MAX extensions.
 Schedules as an EV6 and supports the BWX, CIX, FIX, and MAX extensions.
 @end table
 
+Native Linux/GNU toolchains also support the value @samp{native},
+which selects the best architecture option for the host processor.
+@option{-mcpu=native} has no effect if GCC does not recognize
+the processor.
+
 @item -mtune=@var{cpu_type}
 @opindex mtune
 Set only the instruction scheduling parameters for machine type
 @var{cpu_type}.  The instruction set is not changed.
 
+Native Linux/GNU toolchains also support the value @samp{native},
+which selects the best architecture option for the host processor.
+@option{-mtune=native} has no effect if GCC does not recognize
+the processor.
+
 @item -mmemory-latency=@var{time}
 @opindex mmemory-latency
 Sets the latency the scheduler should assume for typical memory