gcc-4.6-source 4.6.4-6ubuntu2 / usr / src / gcc-4.6 / debian / patches / gold-and-ld.diff

# DP: Enable both gold and ld in a single toolchain.
# DP: New option -fuse-ld=ld.bfd, -fuse-ld=gold.

--- a/src/gcc/doc/invoke.texi
+++ b/srcgcc/doc/invoke.texi
@@ -399,7 +399,7 @@
 -funit-at-a-time -funroll-all-loops -funroll-loops @gol
 -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops @gol
 -fvariable-expansion-in-unroller -fvect-cost-model -fvpt -fweb @gol
--fwhole-program -fwpa -fuse-linker-plugin @gol
+-fwhole-program -fwpa -fuse-ld -fuse-linker-plugin @gol
 --param @var{name}=@var{value}
 -O  -O0  -O1  -O2  -O3  -Os -Ofast}
 
@@ -7689,6 +7689,16 @@
 Enabled by default when LTO support in GCC is enabled and GCC was compiled
 with linker supporting plugins (GNU ld or @code{gold}).
 
+@item -fuse-ld=gold
+Use the @command{gold} linker instead of the default linker.
+This option is only necessary if GCC has been configured with
+@option{--enable-gold} and @option{--enable-ld=default}.
+
+@item -fuse-ld=bfd
+Use the @command{ld.bfd} linker instead of the default linker.
+This option is only necessary if GCC has been configured with
+@option{--enable-gold} and @option{--enable-ld}.
+
 @item -fcprop-registers
 @opindex fcprop-registers
 After register allocation and post-register allocation instruction splitting,
--- a/src/gcc/gcc.c
+++ b/srcgcc/gcc.c
@@ -656,6 +656,9 @@
     }"PLUGIN_COND_CLOSE" \
     %{flto|flto=*:%<fcompare-debug*} \
     %{flto} %{flto=*} %l " LINK_PIE_SPEC \
+   "%{fuse-ld=gold:%{fuse-ld=bfd:%e-fuse-ld=gold and -fuse-ld=bfd may not be used together}} \
+    %{fuse-ld=gold:-use-gold} \
+    %{fuse-ld=bfd:-use-ld}" \
    "%X %{o*} %{e*} %{N} %{n} %{r}\
     %{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!nostartfiles:%S}}\
     %{static:} %{L*} %(mfwrap) %(link_libgcc) %o\
--- a/src/gcc/opts.c
+++ b/srcgcc/opts.c
@@ -1691,8 +1691,9 @@
       dc->max_errors = value;
       break;
 
+    case OPT_fuse_ld_:
     case OPT_fuse_linker_plugin:
-      /* No-op. Used by the driver and passed to us because it starts with f.*/
+      /* No-op. Used by the driver and passed to us because it starts with f.  */
       break;
 
     default:
--- a/src/gcc/configure.ac
+++ b/srcgcc/configure.ac
@@ -1937,6 +1937,17 @@
         AC_PATH_PROG(gcc_cv_ld, $LD_FOR_TARGET)
 fi])
 
+gcc_cv_ld_gold_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/gold
+
+AS_VAR_SET_IF(gcc_cv_gold,, [
+if test -f $gcc_cv_ld_gold_srcdir/configure.ac \
+     && test -f ../gold/Makefile \
+     && test x$build = x$host; then
+	gcc_cv_gold=../gold/ld-new$build_exeext
+else
+        gcc_cv_gold=''
+fi])
+
 ORIGINAL_PLUGIN_LD_FOR_TARGET=$gcc_cv_ld
 PLUGIN_LD=`basename $gcc_cv_ld`
 AC_ARG_WITH(plugin-ld,
@@ -1966,6 +1977,9 @@
   *) AC_CONFIG_FILES(collect-ld:exec-tool.in, [chmod +x collect-ld]) ;;
 esac 
 
+ORIGINAL_GOLD_FOR_TARGET=$gcc_cv_gold
+AC_SUBST(ORIGINAL_GOLD_FOR_TARGET)
+
 AC_MSG_CHECKING(what linker to use)
 if test "$gcc_cv_ld" = ../ld/ld-new$build_exeext; then
 	# Single tree build which includes ld.  We want to prefer it
--- a/src/gcc/exec-tool.in
+++ b/srcgcc/exec-tool.in
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2007, 2008, 2010 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
 # This file is part of GCC.
 
 # GCC is free software; you can redistribute it and/or modify
@@ -21,11 +21,13 @@
 
 ORIGINAL_AS_FOR_TARGET="@ORIGINAL_AS_FOR_TARGET@"
 ORIGINAL_LD_FOR_TARGET="@ORIGINAL_LD_FOR_TARGET@"
+ORIGINAL_GOLD_FOR_TARGET="@ORIGINAL_GOLD_FOR_TARGET@"
 ORIGINAL_PLUGIN_LD_FOR_TARGET="@ORIGINAL_PLUGIN_LD_FOR_TARGET@"
 ORIGINAL_NM_FOR_TARGET="@ORIGINAL_NM_FOR_TARGET@"
 exeext=@host_exeext@
 fast_install=@enable_fast_install@
 objdir=@objdir@
+version="1.1"
 
 invoked=`basename "$0"`
 id=$invoked
@@ -36,15 +38,44 @@
     dir=gas
     ;;
   collect-ld)
-    # when using a linker plugin, gcc will always pass '-plugin' as the
-    # first or second option to the linker.
-    if test x"$1" = "x-plugin" || test x"$2" = "x-plugin"; then
-      original=$ORIGINAL_PLUGIN_LD_FOR_TARGET
-    else
-      original=$ORIGINAL_LD_FOR_TARGET
+    prog=ld-new$exeext
+    # Look for the a command line option
+    # specifying the linker to be used.
+    case " $* " in
+      *\ -use-gold\ *)
+        original=$ORIGINAL_GOLD_FOR_TARGET
+	dir=gold
+        ;;
+      *\ -use-ld\ * | *\ -use-ld.bfd\ *)
+        original=$ORIGINAL_LD_FOR_TARGET
+        dir=ld
+        ;;
+      *\ -plugin\ *)
+        original=$ORIGINAL_PLUGIN_LD_FOR_TARGET
+        dir=ld
+	;;
+      *)
+        original=$ORIGINAL_LD_FOR_TARGET
+        dir=ld
+	;;
+    esac
+
+    # If the selected linker has not been configured then
+    # try using the others, in the order PLUGIN-LD, LD, GOLD.
+    if test x"$original" = x; then
+      if test x"$ORIGINAL_PLUGIN_LD_FOR_TARGET" != x; then
+        original=$ORIGINAL_PLUGIN_LD_FOR_TARGET
+        dir=ld
+      elif test x"$ORIGINAL_LD_FOR_TARGET" != x; then
+        original=$ORIGINAL_LD_FOR_TARGET
+        dir=ld
+      elif test x"$ORIGINAL_GOLD_FOR_TARGET" != x; then
+        original=$ORIGINAL_GOLD_FOR_TARGET
+        dir=gold
+      # Otherwise do nothing - the case statement below
+      # will issue an error message for us.
+      fi
     fi
-    prog=ld-new$exeext
-    dir=ld
     id=ld
     ;;
   nm)
@@ -61,29 +92,58 @@
     scriptdir=`cd "$tdir" && pwd`
 
     if test -x $scriptdir/../$dir/$prog; then
-      test "$fast_install" = yes || exec $scriptdir/../$dir/$prog ${1+"$@"}
+      if test "$fast_install" = yes; then
+        # If libtool did everything it needs to do, there's a fast path.
+        lt_prog=$scriptdir/../$dir/$objdir/lt-$prog 
 
-      # if libtool did everything it needs to do, there's a fast path
-      lt_prog=$scriptdir/../$dir/$objdir/lt-$prog 
-      test -x $lt_prog && exec $lt_prog ${1+"$@"}
-
-      # libtool has not relinked ld-new yet, but we cannot just use the
-      # previous stage (because then the relinking would just never happen!).
-      # So we take extra care to use prev-ld/ld-new *on recursive calls*.
-      eval LT_RCU="\${LT_RCU_$id}"
-      test x"$LT_RCU" = x"1" && exec $scriptdir/../prev-$dir/$prog ${1+"$@"}
-
-      eval LT_RCU_$id=1
-      export LT_RCU_$id
-      $scriptdir/../$dir/$prog ${1+"$@"}
-      result=$?
-      exit $result
-
+	if test -x $lt_prog; then
+	  original=$lt_prog
+        else
+          # Libtool has not relinked ld-new yet, but we cannot just use the
+          # previous stage (because then the relinking would just never happen!).
+          # So we take extra care to use prev-ld/ld-new *on recursive calls*.
+          eval LT_RCU="\${LT_RCU_$id}"
+          if test x"$LT_RCU" = x"1"; then
+	    original=$scriptdir/../prev-$dir/$prog
+          else
+            eval LT_RCU_$id=1
+            export LT_RCU_$id
+            case " $* " in
+              *\ -v\ *)
+               echo "$invoked $version"
+               echo $scriptdir/../$dir/$prog $*
+               ;;
+            esac
+            $scriptdir/../$dir/$prog ${1+"$@"}
+            result=$?
+            exit $result
+          fi
+        fi
+      else
+	original=$scriptdir/../$dir/$prog
+      fi
     else
-      exec $scriptdir/../prev-$dir/$prog ${1+"$@"}
+      original=$scriptdir/../prev-$dir/$prog
     fi
     ;;
-  *)
-    exec $original ${1+"$@"}
+  "")
+    echo "$invoked: executable not configured"
+    exit 1
     ;;
 esac
+
+# If -v has been used then display our version number
+# and then echo the command we are about to invoke.
+case " $* " in
+  *\ -v\ *)
+    echo "$invoked $version"
+    echo $original $*
+    ;;
+esac
+
+if test -x $original; then
+  exec "$original" ${1+"$@"}
+else
+  echo "$invoked: unable to locate executable: $original"
+  exit 1
+fi
--- a/src/gcc/common.opt
+++ b/srcgcc/common.opt
@@ -1998,6 +1998,9 @@
 Common Report Var(flag_unwind_tables) Optimization
 Just generate unwind tables for exception handling
 
+fuse-ld=
+Common Joined Undocumented
+
 fuse-linker-plugin
 Common Undocumented
 
--- a/src/gcc/collect2.c
+++ b/srcgcc/collect2.c
@@ -1075,17 +1075,19 @@
 int
 main (int argc, char **argv)
 {
-  static const char *const ld_suffix	= "ld";
-  static const char *const plugin_ld_suffix = PLUGIN_LD;
-  static const char *const real_ld_suffix = "real-ld";
+  static const char *const ld_suffix	     = "ld";
+  static const char *const gold_suffix       = "gold";
+  static const char *const bfd_ld_suffix     = "ld.bfd";
+  static const char *const plugin_ld_suffix  = PLUGIN_LD;
+  static const char *const real_ld_suffix    = "real-ld";
   static const char *const collect_ld_suffix = "collect-ld";
-  static const char *const nm_suffix	= "nm";
-  static const char *const gnm_suffix	= "gnm";
+  static const char *const nm_suffix	     = "nm";
+  static const char *const gnm_suffix	     = "gnm";
 #ifdef LDD_SUFFIX
-  static const char *const ldd_suffix	= LDD_SUFFIX;
+  static const char *const ldd_suffix	     = LDD_SUFFIX;
 #endif
-  static const char *const strip_suffix = "strip";
-  static const char *const gstrip_suffix = "gstrip";
+  static const char *const strip_suffix      = "strip";
+  static const char *const gstrip_suffix     = "gstrip";
 
 #ifdef CROSS_DIRECTORY_STRUCTURE
   /* If we look for a program in the compiler directories, we just use
@@ -1095,6 +1097,10 @@
 
   const char *const full_ld_suffix =
     concat(target_machine, "-", ld_suffix, NULL);
+  const char *const full_gold_suffix =
+    concat (target_machine, "-", gold_suffix, NULL);
+  const char *const full_bfd_ld_suffix =
+    concat (target_machine, "-", bfd_ld_suffix, NULL);
   const char *const full_plugin_ld_suffix =
     concat(target_machine, "-", plugin_ld_suffix, NULL);
   const char *const full_nm_suffix =
@@ -1110,15 +1116,17 @@
   const char *const full_gstrip_suffix =
     concat (target_machine, "-", gstrip_suffix, NULL);
 #else
-  const char *const full_ld_suffix	= ld_suffix;
+  const char *const full_ld_suffix	  = ld_suffix;
+  const char *const full_gold_suffix	  = gold_suffix;
+  const char *const full_bfd_ld_suffix	  = bfd_ld_suffix;
   const char *const full_plugin_ld_suffix = plugin_ld_suffix;
-  const char *const full_nm_suffix	= nm_suffix;
-  const char *const full_gnm_suffix	= gnm_suffix;
+  const char *const full_nm_suffix	  = nm_suffix;
+  const char *const full_gnm_suffix	  = gnm_suffix;
 #ifdef LDD_SUFFIX
-  const char *const full_ldd_suffix	= ldd_suffix;
+  const char *const full_ldd_suffix	  = ldd_suffix;
 #endif
-  const char *const full_strip_suffix	= strip_suffix;
-  const char *const full_gstrip_suffix	= gstrip_suffix;
+  const char *const full_strip_suffix	  = strip_suffix;
+  const char *const full_gstrip_suffix	  = gstrip_suffix;
 #endif /* CROSS_DIRECTORY_STRUCTURE */
 
   const char *arg;
@@ -1132,7 +1140,13 @@
   const char **c_ptr;
   char **ld1_argv;
   const char **ld1;
-  bool use_plugin = false;
+  enum linker_select
+  {
+    DFLT_LINKER,
+    PLUGIN_LINKER,
+    GOLD_LINKER,
+    BFD_LINKER
+  } selected_linker = DFLT_LINKER;
 
   /* The kinds of symbols we will have to consider when scanning the
      outcome of a first pass link.  This is ALL to start with, then might
@@ -1209,15 +1223,21 @@
         else if (! strcmp (argv[i], "-flto-partition=none"))
 	  no_partition = true;
         else if ((! strncmp (argv[i], "-flto=", 6)
-		  || ! strcmp (argv[i], "-flto")) && ! use_plugin)
+		  || ! strcmp (argv[i], "-flto"))
+		 && selected_linker != PLUGIN_LINKER)
 	  lto_mode = LTO_MODE_WHOPR;
 	else if (!strncmp (argv[i], "-fno-lto", 8))
 	  lto_mode = LTO_MODE_NONE;
         else if (! strcmp (argv[i], "-plugin"))
 	  {
-	    use_plugin = true;
+	    selected_linker =  PLUGIN_LINKER;
 	    lto_mode = LTO_MODE_NONE;
 	  }
+	else if (! strcmp (argv[i], "-use-gold"))
+	  selected_linker = GOLD_LINKER;
+	else if (! strcmp (argv[i], "-use-ld"))
+	  selected_linker = BFD_LINKER;
+
 #ifdef COLLECT_EXPORT_LIST
 	/* since -brtl, -bexport, -b64 are not position dependent
 	   also check for them here */
@@ -1299,36 +1319,109 @@
   /* Try to discover a valid linker/nm/strip to use.  */
 
   /* Maybe we know the right file to use (if not cross).  */
-  ld_file_name = 0;
+  ld_file_name = NULL;
 #ifdef DEFAULT_LINKER
   if (access (DEFAULT_LINKER, X_OK) == 0)
     ld_file_name = DEFAULT_LINKER;
-  if (ld_file_name == 0)
+  if (ld_file_name == NULL)
 #endif
 #ifdef REAL_LD_FILE_NAME
   ld_file_name = find_a_file (&path, REAL_LD_FILE_NAME);
-  if (ld_file_name == 0)
+  if (ld_file_name == NULL)
 #endif
   /* Search the (target-specific) compiler dirs for ld'.  */
   ld_file_name = find_a_file (&cpath, real_ld_suffix);
   /* Likewise for `collect-ld'.  */
-  if (ld_file_name == 0)
+  if (ld_file_name == NULL)
     ld_file_name = find_a_file (&cpath, collect_ld_suffix);
   /* Search the compiler directories for `ld'.  We have protection against
      recursive calls in find_a_file.  */
-  if (ld_file_name == 0)
-    ld_file_name = find_a_file (&cpath,
-				use_plugin
-				? plugin_ld_suffix
-				: ld_suffix);
+  if (ld_file_name == NULL)
+    switch (selected_linker)
+      {
+      default:
+      case DFLT_LINKER:
+	ld_file_name = find_a_file (&cpath, ld_suffix);
+	break;
+      case PLUGIN_LINKER:
+	ld_file_name = find_a_file (&cpath, plugin_ld_suffix);
+	break;
+      case GOLD_LINKER:
+	ld_file_name = find_a_file (&cpath, gold_suffix);
+	break;
+      case BFD_LINKER:
+	ld_file_name = find_a_file (&cpath, bfd_ld_suffix);
+	break;
+      }
   /* Search the ordinary system bin directories
      for `ld' (if native linking) or `TARGET-ld' (if cross).  */
-  if (ld_file_name == 0)
-    ld_file_name = find_a_file (&path,
-				use_plugin
-				? full_plugin_ld_suffix
-				: full_ld_suffix);
+  if (ld_file_name == NULL)
+    switch (selected_linker)
+      {
+      default:
+      case DFLT_LINKER:
+	ld_file_name = find_a_file (&path, full_ld_suffix);
+	break;
+      case PLUGIN_LINKER:
+	ld_file_name = find_a_file (&path, full_plugin_ld_suffix);
+	break;
+      case GOLD_LINKER:
+	ld_file_name = find_a_file (&path, full_gold_suffix);
+	break;
+      case BFD_LINKER:
+	ld_file_name = find_a_file (&path, full_bfd_ld_suffix);
+	break;
+      }
+  /* If we failed to find a plugin-capable linker, try the ordinary one.  */
+  if (ld_file_name == NULL && selected_linker == PLUGIN_LINKER)
+    ld_file_name = find_a_file (&cpath, ld_suffix);
 
+  if ((vflag || debug) && ld_file_name == NULL)
+    {
+      struct prefix_list * p;
+      const char * s;
+
+      notice ("collect2: warning: unable to find linker.\n");
+
+#ifdef DEFAULT_LINKER
+      notice (" Searched for this absolute executable:\n");
+      notice (" %s\n", DEFAULT_LINKER);
+#endif
+
+      notice (" Searched in these paths:\n");
+      for (p = cpath.plist; p != NULL; p = p->next)
+	notice ("  %s\n", p->prefix);
+      notice (" For these executables:\n");
+      notice ("  %s\n", real_ld_suffix);
+      notice ("  %s\n", collect_ld_suffix);
+      switch (selected_linker)
+      {
+      default:
+      case DFLT_LINKER:    s = ld_suffix; break;
+      case PLUGIN_LINKER:  s = plugin_ld_suffix; break;
+      case GOLD_LINKER:    s = gold_suffix; break;
+      case BFD_LINKER:     s = bfd_ld_suffix; break;
+      }
+      notice ("  %s\n", s);
+
+      notice (" And searched in these paths:\n");
+      for (p = path.plist; p != NULL; p = p->next)
+	notice ("  %s\n", p->prefix);
+      notice (" For these executables:\n");
+#ifdef REAL_LD_FILE_NAME
+      notice (" %s\n", REAL_LD_FILE_NAME);
+#endif
+      switch (selected_linker)
+      {
+      default:
+      case DFLT_LINKER:    s = full_ld_suffix; break;
+      case PLUGIN_LINKER:  s = full_plugin_ld_suffix; break;
+      case GOLD_LINKER:    s = full_gold_suffix; break;
+      case BFD_LINKER:     s = full_bfd_ld_suffix; break;
+      }
+      notice ("  %s\n", s);
+    }
+
 #ifdef REAL_NM_FILE_NAME
   nm_file_name = find_a_file (&path, REAL_NM_FILE_NAME);
   if (nm_file_name == 0)