Add slim-lto-bootstrap build-config

diff --git a/Makefile.in b/Makefile.in
index 0108162..891168d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -2835,6 +2835,7 @@  configure-build-fixincludes:
 	test ! -f $(BUILD_SUBDIR)/fixincludes/Makefile || exit 0; \
 	$(SHELL) $(srcdir)/mkinstalldirs $(BUILD_SUBDIR)/fixincludes ; \
 	$(BUILD_EXPORTS)  \
+	CFLAGS="$(STAGE_CFLAGS)"; export CFLAGS; \
 	echo Configuring in $(BUILD_SUBDIR)/fixincludes; \
 	cd "$(BUILD_SUBDIR)/fixincludes" || exit 1; \
 	case $(srcdir) in \
@@ -2870,6 +2871,7 @@  all-build-fixincludes: configure-build-fixincludes
 	$(BUILD_EXPORTS)  \
 	(cd $(BUILD_SUBDIR)/fixincludes && \
 	  $(MAKE) $(BASE_FLAGS_TO_PASS) $(EXTRA_BUILD_FLAGS)  \
+		CFLAGS="$(STAGE_CFLAGS)" \
 		$(TARGET-build-fixincludes))
 @endif build-fixincludes
 
@@ -7745,6 +7747,7 @@  configure-fixincludes:
 	test ! -f $(HOST_SUBDIR)/fixincludes/Makefile || exit 0; \
 	$(SHELL) $(srcdir)/mkinstalldirs $(HOST_SUBDIR)/fixincludes ; \
 	$(HOST_EXPORTS)  \
+	CFLAGS="$(STAGE_CFLAGS)"; export CFLAGS; \
 	echo Configuring in $(HOST_SUBDIR)/fixincludes; \
 	cd "$(HOST_SUBDIR)/fixincludes" || exit 1; \
 	case $(srcdir) in \
@@ -7779,6 +7782,7 @@  all-fixincludes: configure-fixincludes
 	$(HOST_EXPORTS)  \
 	(cd $(HOST_SUBDIR)/fixincludes && \
 	  $(MAKE) $(BASE_FLAGS_TO_PASS) $(EXTRA_HOST_FLAGS)  \
+		CFLAGS="$(STAGE_CFLAGS)" \
 		$(TARGET-fixincludes))
 @endif fixincludes
 
diff --git a/config/slim-lto-bootstrap.mk b/config/slim-lto-bootstrap.mk
new file mode 100644
index 0000000..11d1252
--- /dev/null
+++ b/config/slim-lto-bootstrap.mk
@@ -0,0 +1,9 @@ 
+# This option enables slim LTO for stage2 and stage3.
+
+STAGE2_CFLAGS += -flto=jobserver -fno-fat-lto-objects -frandom-seed=1
+STAGE3_CFLAGS += -flto=jobserver -fno-fat-lto-objects -frandom-seed=1
+STAGE_CFLAGS += -fuse-linker-plugin
+STAGEprofile_CFLAGS += -fno-lto
+AR = gcc-ar
+NM = gcc-nm
+RANLIB = gcc-ranlib
diff --git a/libtool.m4 b/libtool.m4
index a7f99ac..5754fb1 100644
--- a/libtool.m4
+++ b/libtool.m4
@@ -3434,6 +3434,7 @@  for ac_symprfx in "" "_"; do
   else
     lt_cv_sys_global_symbol_pipe="sed -n -e 's/^.*[[	 ]]\($symcode$symcode*\)[[	 ]][[	 ]]*$ac_symprfx$sympat$opt_cr$/$symxfrm/p'"
   fi
+  lt_cv_sys_global_symbol_pipe="$lt_cv_sys_global_symbol_pipe | sed '/ __gnu_lto/d'"
 
   # Check to see that the pipe works correctly.
   pipe_works=no
@@ -4451,7 +4452,7 @@  _LT_EOF
       if $LD --help 2>&1 | $EGREP ': supported targets:.* elf' > /dev/null \
 	 && test "$tmp_diet" = no
       then
-	tmp_addflag=
+	tmp_addflag=' $pic_flag'
 	tmp_sharedflag='-shared'
 	case $cc_basename,$host_cpu in
         pgcc*)				# Portland Group C compiler
@@ -5517,8 +5518,8 @@  if test "$_lt_caught_CXX_error" != yes; then
       # Check if GNU C++ uses GNU ld as the underlying linker, since the
       # archiving commands below assume that GNU ld is being used.
       if test "$with_gnu_ld" = yes; then
-        _LT_TAGVAR(archive_cmds, $1)='$CC -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname -o $lib'
-        _LT_TAGVAR(archive_expsym_cmds, $1)='$CC -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname ${wl}-retain-symbols-file $wl$export_symbols -o $lib'
+        _LT_TAGVAR(archive_cmds, $1)='$CC $pic_flag -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname -o $lib'
+        _LT_TAGVAR(archive_expsym_cmds, $1)='$CC $pic_flag -shared -nostdlib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname ${wl}-retain-symbols-file $wl$export_symbols -o $lib'
 
         _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='${wl}-rpath ${wl}$libdir'
         _LT_TAGVAR(export_dynamic_flag_spec, $1)='${wl}--export-dynamic'
@@ -6495,6 +6496,13 @@  public class foo {
 };
 _LT_EOF
 ])
+
+_lt_libdeps_save_CFLAGS=$CFLAGS
+case "$CC $CFLAGS " in #(
+*\ -flto*\ *) CFLAGS="$CFLAGS -fno-lto" ;;
+*\ -fwhopr*\ *) CFLAGS="$CFLAGS -fno-whopr" ;;
+esac
+
 dnl Parse the compiler output and extract the necessary
 dnl objects, libraries and library flags.
 if AC_TRY_EVAL(ac_compile); then
@@ -6543,6 +6551,7 @@  if AC_TRY_EVAL(ac_compile); then
        fi
        ;;
 
+    *.lto.$objext) ;; # Ignore GCC LTO objects
     *.$objext)
        # This assumes that the test object file only shows up
        # once in the compiler output.
@@ -6578,6 +6587,7 @@  else
 fi
 
 $RM -f confest.$objext
+CFLAGS=$_lt_libdeps_save_CFLAGS
 
 # PORTME: override above test on systems where it is broken
 m4_if([$1], [CXX],
diff --git a/ltmain.sh b/ltmain.sh
index a03433f..2e09101 100644
--- a/ltmain.sh
+++ b/ltmain.sh
@@ -4980,7 +4980,8 @@  func_mode_link ()
       # @file GCC response files
       # -tp=* Portland pgcc target processor selection
       -64|-mips[0-9]|-r[0-9][0-9]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*| \
-      -t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*)
+      -t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*| \
+      -O*|-flto*|-fwhopr|-fuse-linker-plugin)
         func_quote_for_eval "$arg"
 	arg="$func_quote_for_eval_result"
         func_append compile_command " $arg"