GCC: Pass --plugin to AR and RANLIB

Detect GCC LTO plugin.  Pass --plugin to AR and RANLIB to support LTO
build.

	* Makefile.tpl (AR): Add @AR_PLUGIN_OPTION@
	(RANLIB): Add @RANLIB_PLUGIN_OPTION@.
	* configure.ac: Include config/gcc-plugin.m4.
	AC_SUBST AR_PLUGIN_OPTION and RANLIB_PLUGIN_OPTION.
	* libtool.m4 (_LT_CMD_OLD_ARCHIVE): Pass --plugin to AR and
	RANLIB if possible.
	* Makefile.in: Regenerated.
	* configure: Likewise.

config/

	* gcc-plugin.m4 (GCC_PLUGIN_OPTION): New.

libiberty/

	* Makefile.in (AR): Add @AR_PLUGIN_OPTION@
	(RANLIB): Add @RANLIB_PLUGIN_OPTION@.
	(configure_deps): Depend on ../config/gcc-plugin.m4.
	* aclocal.m4: Include ../config/gcc-plugin.m4.
	* configure.ac: AC_SUBST AR_PLUGIN_OPTION and
	RANLIB_PLUGIN_OPTION.
	* configure: Regenerated.

zlib/

	* configure: Regenerated.

5 files changed, 63 insertions, 2 deletions

diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index a6f82ef6ec9..3fffbc07ef2 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,13 @@
+2021-01-09  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* Makefile.in (AR): Add @AR_PLUGIN_OPTION@
+	(RANLIB): Add @RANLIB_PLUGIN_OPTION@.
+	(configure_deps): Depend on ../config/gcc-plugin.m4.
+	* aclocal.m4: Include ../config/gcc-plugin.m4.
+	* configure.ac: AC_SUBST AR_PLUGIN_OPTION and
+	RANLIB_PLUGIN_OPTION.
+	* configure: Regenerated.
+
 2021-01-04  Martin Liska  <mliska@suse.cz>
 
 	* strverscmp.c: Convert to utf8 from iso8859.
diff --git a/libiberty/Makefile.in b/libiberty/Makefile.in
index 788590957e1..711e155b075 100644
--- a/libiberty/Makefile.in
+++ b/libiberty/Makefile.in
@@ -49,13 +49,13 @@ mkinstalldirs = $(SHELL) $(libiberty_topdir)/mkinstalldirs
 # Some compilers can't handle cc -c blah.c -o foo/blah.o.
 OUTPUT_OPTION = @OUTPUT_OPTION@
 
-AR = @AR@
+AR = @AR@ @AR_PLUGIN_OPTION@
 AR_FLAGS = rc
 
 CC = @CC@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
-RANLIB = @RANLIB@
+RANLIB = @RANLIB@ @RANLIB_PLUGIN_OPTION@
 MAKEINFO = @MAKEINFO@
 PERL = @PERL@
 
@@ -485,6 +485,7 @@ configure_deps = $(srcdir)/aclocal.m4 \
 	$(srcdir)/../config/acx.m4 \
 	$(srcdir)/../config/cet.m4 \
 	$(srcdir)/../config/enable.m4 \
+	$(srcdir)/../config/gcc-plugin.m4 \
 	$(srcdir)/../config/no-executables.m4 \
 	$(srcdir)/../config/override.m4 \
 	$(srcdir)/../config/picflag.m4 \
diff --git a/libiberty/aclocal.m4 b/libiberty/aclocal.m4
index 34c0a5bab62..b2e54d9e32a 100644
--- a/libiberty/aclocal.m4
+++ b/libiberty/aclocal.m4
@@ -1,6 +1,7 @@
 sinclude(../config/acx.m4)
 sinclude(../config/cet.m4)
 sinclude(../config/enable.m4)
+sinclude(../config/gcc-plugin.m4)
 sinclude(../config/no-executables.m4)
 sinclude(../config/override.m4)
 sinclude(../config/picflag.m4)
diff --git a/libiberty/configure b/libiberty/configure
index b6af9baf212..5d7aee38903 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -645,6 +645,8 @@ CPPFLAGS
 LDFLAGS
 CFLAGS
 CC
+RANLIB_PLUGIN_OPTION
+AR_PLUGIN_OPTION
 RANLIB
 AR
 host_os
@@ -2932,6 +2934,41 @@ else
 fi
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -plugin option" >&5
+$as_echo_n "checking for -plugin option... " >&6; }
+
+plugin_names="liblto_plugin.so liblto_plugin-0.dll cyglto_plugin-0.dll"
+plugin_option=
+for plugin in $plugin_names; do
+  plugin_so=`${CC} ${CFLAGS} --print-prog-name $plugin`
+  if test x$plugin_so = x$plugin; then
+    plugin_so=`${CC} ${CFLAGS} --print-file-name $plugin`
+  fi
+  if test x$plugin_so != x$plugin; then
+    plugin_option="--plugin $plugin_so"
+    break
+  fi
+done
+if test -n "$plugin_option"; then
+  PLUGIN_OPTION="$plugin_option"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $plugin_option" >&5
+$as_echo "$plugin_option" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+if test -n "$PLUGIN_OPTION"; then
+  if $AR --help 2>&1 | grep -q "\--plugin"; then
+    AR_PLUGIN_OPTION="$PLUGIN_OPTION"
+
+  fi
+  if $RANLIB --help 2>&1 | grep -q "\--plugin"; then
+    RANLIB_PLUGIN_OPTION="$PLUGIN_OPTION"
+
+  fi
+fi
+
 # Add --enable-multilib to configure.
 # Default to --enable-multilib
 # Check whether --enable-multilib was given.
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index ad952963971..756d11a8260 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -108,6 +108,18 @@ dnl to call AC_CHECK_PROG.
 AC_CHECK_TOOL(AR, ar)
 AC_CHECK_TOOL(RANLIB, ranlib, :)
 
+GCC_PLUGIN_OPTION(PLUGIN_OPTION)
+if test -n "$PLUGIN_OPTION"; then
+  if $AR --help 2>&1 | grep -q "\--plugin"; then
+    AR_PLUGIN_OPTION="$PLUGIN_OPTION"
+    AC_SUBST(AR_PLUGIN_OPTION)
+  fi
+  if $RANLIB --help 2>&1 | grep -q "\--plugin"; then
+    RANLIB_PLUGIN_OPTION="$PLUGIN_OPTION"
+    AC_SUBST(RANLIB_PLUGIN_OPTION)
+  fi
+fi
+
 dnl When switching to automake, replace the following with AM_ENABLE_MULTILIB.
 # Add --enable-multilib to configure.
 # Default to --enable-multilib