Merge autoconf / automake update changes from GCC.

Top level:
	Merge from GCC:
	PR bootstrap/82856
	* multilib.am: New file.  From automake.

config:
	Merge from GCC:
	PR bootstrap/82856
	* math.m4, tls.m4: Use AC_LANG_SOURCE.

zlib:
	Merge from GCC.
	PR bootstrap/82856
	* Makefile.am: Include multilib.am.
	* Makefile.in: Regenerate.

8 files changed, 134 insertions, 30 deletions

diff --git a/ChangeLog b/ChangeLog
index 9fe7427b834..60b19fdb150 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-10-31  Joseph Myers  <joseph@codesourcery.com>
+
+	Merge from GCC:
+	PR bootstrap/82856
+	* multilib.am: New file.  From automake.
+
 2018-09-12  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* src-release.sh (GDB_SUPPORT_DIRS): Add "contrib".
diff --git a/config/ChangeLog b/config/ChangeLog
index d3476c584d7..6e30188b9f4 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,9 @@
+2018-10-31  Joseph Myers  <joseph@codesourcery.com>
+
+	Merge from GCC:
+	PR bootstrap/82856
+	* math.m4, tls.m4: Use AC_LANG_SOURCE.
+
 2018-06-19  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* override.m4 (_GCC_AUTOCONF_VERSION): Bump from 2.64 to 2.69.
diff --git a/config/math.m4 b/config/math.m4
index 23835f230cb..155967e5071 100644
--- a/config/math.m4
+++ b/config/math.m4
@@ -25,7 +25,7 @@ AC_DEFUN([GCC_CHECK_MATH_FUNC],
   AC_REQUIRE([GCC_CHECK_LIBM])
   AC_REQUIRE([GCC_CHECK_MATH_HEADERS])
   AC_CACHE_CHECK([for $1], [gcc_cv_math_func_$1],
-		 [AC_LINK_IFELSE([
+		 [AC_LINK_IFELSE([AC_LANG_SOURCE([
 #ifdef HAVE_COMPLEX_H
 #include <complex.h>
 #endif
@@ -40,7 +40,7 @@ main ()
 {
   return 0;
 }
-],
+])],
 [gcc_cv_math_func_$1=yes],
 [gcc_cv_math_func_$1=no])])
   if test $gcc_cv_math_func_$1 = yes; then
diff --git a/config/tls.m4 b/config/tls.m4
index 4e170c8d6ae..1a5fc59c2b4 100644
--- a/config/tls.m4
+++ b/config/tls.m4
@@ -4,14 +4,14 @@ AC_DEFUN([GCC_CHECK_TLS], [
   GCC_ENABLE(tls, yes, [], [Use thread-local storage])
   AC_CACHE_CHECK([whether the target supports thread-local storage],
 		 gcc_cv_have_tls, [
-    AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
+    AC_RUN_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
       [dnl If the test case passed with dynamic linking, try again with
        dnl static linking, but only if static linking is supported (not
        dnl on Solaris 10).  This fails with some older Red Hat releases.
       chktls_save_LDFLAGS="$LDFLAGS"
       LDFLAGS="-static $LDFLAGS"
-      AC_LINK_IFELSE([int main() { return 0; }],
-	[AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
+      AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 0; }])],
+	[AC_RUN_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
 		       [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[])],
 	[gcc_cv_have_tls=yes])
       LDFLAGS="$chktls_save_LDFLAGS"
@@ -71,7 +71,7 @@ AC_DEFUN([GCC_CHECK_TLS], [
       [gcc_cv_have_tls=no],
       [dnl This is the cross-compiling case. Assume libc supports TLS if the
        dnl binutils and the compiler do.
-       AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
+       AC_LINK_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
 	 [chktls_save_LDFLAGS="$LDFLAGS"
 	  dnl Shared library options may depend on the host; this check
 	  dnl is only known to be needed for GNU/Linux.
@@ -83,8 +83,8 @@ AC_DEFUN([GCC_CHECK_TLS], [
 	  chktls_save_CFLAGS="$CFLAGS"
 	  CFLAGS="-fPIC $CFLAGS"
 	  dnl If -shared works, test if TLS works in a shared library.
-	  AC_LINK_IFELSE([int f() { return 0; }],
-	    [AC_LINK_IFELSE([__thread int a; int b; int f() { return a = b; }],
+	  AC_LINK_IFELSE([AC_LANG_SOURCE([int f() { return 0; }])],
+	    [AC_LINK_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int f() { return a = b; }])],
 	      [gcc_cv_have_tls=yes],
 	      [gcc_cv_have_tls=no])],
 	    [gcc_cv_have_tls=yes])
@@ -102,7 +102,7 @@ AC_DEFUN([GCC_CHECK_CC_TLS], [
   GCC_ENABLE(tls, yes, [], [Use thread-local storage])
   AC_CACHE_CHECK([whether the target assembler supports thread-local storage],
 		 gcc_cv_have_cc_tls, [
-    AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }],
+    AC_COMPILE_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])],
       [gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])]
     )])
   if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
diff --git a/multilib.am b/multilib.am
new file mode 100644
index 00000000000..5c98b69bd63
--- /dev/null
+++ b/multilib.am
@@ -0,0 +1,45 @@
+## automake - create Makefile.in from Makefile.am
+
+## Copyright (C) 1994-2017 Free Software Foundation, Inc.
+## This Makefile.in is free software; the Free Software Foundation
+## gives unlimited permission to copy and/or distribute it,
+## with or without modifications, as long as this notice is preserved.
+
+## This program 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.
+
+MULTISRCTOP =
+MULTIBUILDTOP =
+MULTIDIRS =
+MULTISUBDIR =
+MULTIDO = true
+MULTICLEAN = true
+
+# GNU Make needs to see an explicit $(MAKE) variable in the command it
+# runs to enable its job server during parallel builds.  Hence the
+# comments below.
+all-multi:
+	$(MULTIDO) $(AM_MAKEFLAGS) DO=all multi-do # $(MAKE)
+install-multi:
+	$(MULTIDO) $(AM_MAKEFLAGS) DO=install multi-do # $(MAKE)
+mostlyclean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=mostlyclean multi-clean # $(MAKE)
+clean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=clean multi-clean # $(MAKE)
+distclean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=distclean multi-clean # $(MAKE)
+maintainer-clean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=maintainer-clean multi-clean # $(MAKE)
+
+.MAKE .PHONY: all-multi clean-multi distclean-multi install-am \
+	      install-multi maintainer-clean-multi mostlyclean-multi
+
+install-exec-local: install-multi
+
+all-local: all-multi
+mostlyclean-local: mostlyclean-multi
+clean-local: clean-multi
+distclean-local: distclean-multi
+maintainer-clean-local: maintainer-clean-multi
diff --git a/zlib/ChangeLog.bin-gdb b/zlib/ChangeLog.bin-gdb
index 5b821348f1b..f113fc6a229 100644
--- a/zlib/ChangeLog.bin-gdb
+++ b/zlib/ChangeLog.bin-gdb
@@ -1,3 +1,10 @@
+2018-10-31  Joseph Myers  <joseph@codesourcery.com>
+
+	Merge from GCC.
+	PR bootstrap/82856
+	* Makefile.am: Include multilib.am.
+	* Makefile.in: Regenerate.
+
 2018-06-21  Alan Modra  <amodra@gmail.com>
 
 	* Makefile.in: Regenerate.
diff --git a/zlib/Makefile.am b/zlib/Makefile.am
index eeda1b288a1..520f06592d8 100644
--- a/zlib/Makefile.am
+++ b/zlib/Makefile.am
@@ -59,3 +59,5 @@ AM_MAKEFLAGS = \
 	"PICFLAG=$(PICFLAG)" \
 	"RANLIB=$(RANLIB)" \
 	"DESTDIR=$(DESTDIR)"
+
+include $(top_srcdir)/../multilib.am
diff --git a/zlib/Makefile.in b/zlib/Makefile.in
index 766382246d2..062dc04e80d 100644
--- a/zlib/Makefile.in
+++ b/zlib/Makefile.in
@@ -245,7 +245,8 @@ am__DIST_COMMON = $(srcdir)/Makefile.in $(top_srcdir)/../compile \
 	$(top_srcdir)/../config.guess $(top_srcdir)/../config.sub \
 	$(top_srcdir)/../depcomp $(top_srcdir)/../install-sh \
 	$(top_srcdir)/../ltmain.sh $(top_srcdir)/../missing \
-	$(top_srcdir)/../mkinstalldirs ChangeLog README
+	$(top_srcdir)/../mkinstalldirs $(top_srcdir)/../multilib.am \
+	ChangeLog README
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -441,13 +442,19 @@ AM_MAKEFLAGS = \
 	"RANLIB=$(RANLIB)" \
 	"DESTDIR=$(DESTDIR)"
 
+MULTISRCTOP = 
+MULTIBUILDTOP = 
+MULTIDIRS = 
+MULTISUBDIR = 
+MULTIDO = true
+MULTICLEAN = true
 all: all-am
 
 .SUFFIXES:
 .SUFFIXES: .c .lo .o .obj
 am--refresh: Makefile
 	@:
-$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am $(top_srcdir)/../multilib.am $(am__configure_deps)
 	@for dep in $?; do \
 	  case '$(am__configure_deps)' in \
 	    *$$dep*) \
@@ -469,6 +476,7 @@ Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe)'; \
 	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe);; \
 	esac;
+$(top_srcdir)/../multilib.am $(am__empty):
 
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
 	$(SHELL) ./config.status --recheck
@@ -1030,7 +1038,7 @@ distcleancheck: distclean
 	       exit 1; } >&2
 check-am: all-am
 check: check-am
-all-am: Makefile $(LIBRARIES) $(LTLIBRARIES)
+all-am: Makefile $(LIBRARIES) $(LTLIBRARIES) all-local
 installdirs:
 	for dir in "$(DESTDIR)$(toolexeclibdir)"; do \
 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
@@ -1067,15 +1075,16 @@ maintainer-clean-generic:
 	@echo "it deletes files that may require special tools to rebuild."
 clean: clean-am
 
-clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
-	clean-toolexeclibLIBRARIES mostlyclean-am
+clean-am: clean-generic clean-libtool clean-local \
+	clean-noinstLTLIBRARIES clean-toolexeclibLIBRARIES \
+	mostlyclean-am
 
 distclean: distclean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -rf ./$(DEPDIR)
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
-	distclean-libtool distclean-tags
+	distclean-libtool distclean-local distclean-tags
 
 dvi: dvi-am
 
@@ -1095,7 +1104,7 @@ install-dvi: install-dvi-am
 
 install-dvi-am:
 
-install-exec-am: install-toolexeclibLIBRARIES
+install-exec-am: install-exec-local install-toolexeclibLIBRARIES
 
 install-html: install-html-am
 
@@ -1122,12 +1131,13 @@ maintainer-clean: maintainer-clean-am
 	-rm -rf $(top_srcdir)/autom4te.cache
 	-rm -rf ./$(DEPDIR)
 	-rm -f Makefile
-maintainer-clean-am: distclean-am maintainer-clean-generic
+maintainer-clean-am: distclean-am maintainer-clean-generic \
+	maintainer-clean-local
 
 mostlyclean: mostlyclean-am
 
 mostlyclean-am: mostlyclean-compile mostlyclean-generic \
-	mostlyclean-libtool
+	mostlyclean-libtool mostlyclean-local
 
 pdf: pdf-am
 
@@ -1141,28 +1151,56 @@ uninstall-am: uninstall-toolexeclibLIBRARIES
 
 .MAKE: install-am install-strip
 
-.PHONY: CTAGS GTAGS TAGS all all-am am--refresh check check-am clean \
-	clean-cscope clean-generic clean-libtool \
-	clean-noinstLTLIBRARIES clean-toolexeclibLIBRARIES cscope \
-	cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
+.PHONY: CTAGS GTAGS TAGS all all-am all-local am--refresh check \
+	check-am clean clean-cscope clean-generic clean-libtool \
+	clean-local clean-noinstLTLIBRARIES clean-toolexeclibLIBRARIES \
+	cscope cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
 	dist-gzip dist-lzip dist-shar dist-tarZ dist-xz dist-zip \
 	distcheck distclean distclean-compile distclean-generic \
-	distclean-libtool distclean-tags distcleancheck distdir \
-	distuninstallcheck dvi dvi-am html html-am info info-am \
-	install install-am install-data install-data-am install-dvi \
-	install-dvi-am install-exec install-exec-am install-html \
+	distclean-libtool distclean-local distclean-tags \
+	distcleancheck distdir distuninstallcheck dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-exec-local install-html \
 	install-html-am install-info install-info-am install-man \
 	install-pdf install-pdf-am install-ps install-ps-am \
 	install-strip install-toolexeclibLIBRARIES installcheck \
 	installcheck-am installdirs maintainer-clean \
-	maintainer-clean-generic mostlyclean mostlyclean-compile \
-	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
-	tags tags-am uninstall uninstall-am \
-	uninstall-toolexeclibLIBRARIES
+	maintainer-clean-generic maintainer-clean-local mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	mostlyclean-local pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-toolexeclibLIBRARIES
 
 .PRECIOUS: Makefile
 
 
+# GNU Make needs to see an explicit $(MAKE) variable in the command it
+# runs to enable its job server during parallel builds.  Hence the
+# comments below.
+all-multi:
+	$(MULTIDO) $(AM_MAKEFLAGS) DO=all multi-do # $(MAKE)
+install-multi:
+	$(MULTIDO) $(AM_MAKEFLAGS) DO=install multi-do # $(MAKE)
+mostlyclean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=mostlyclean multi-clean # $(MAKE)
+clean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=clean multi-clean # $(MAKE)
+distclean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=distclean multi-clean # $(MAKE)
+maintainer-clean-multi:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=maintainer-clean multi-clean # $(MAKE)
+
+.MAKE .PHONY: all-multi clean-multi distclean-multi install-am \
+	      install-multi maintainer-clean-multi mostlyclean-multi
+
+install-exec-local: install-multi
+
+all-local: all-multi
+mostlyclean-local: mostlyclean-multi
+clean-local: clean-multi
+distclean-local: distclean-multi
+maintainer-clean-local: maintainer-clean-multi
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT: