Makefile.am (install-headers): Cope with empty parallel_headers.

libstdc++-v3/
	* include/Makefile.am (install-headers): Cope with empty
	parallel_headers.
	* include/Makefile.in: Regenerate.

From-SVN: r134829

libstdc++-v3/ChangeLog

+2008-04-30  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
+	* include/Makefile.am (install-headers): Cope with empty
+	parallel_headers.
+	* include/Makefile.in: Regenerate.
+
 2008-04-29  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* include/bits/c++config: Remove space between '#' and 'undef' for

libstdc++-v3/include/Makefile.am

@@ -1196,8 +1196,10 @@ install-headers:
 	$(mkinstalldirs) $(DESTDIR)${gxx_include_dir}/${debug_builddir}
 	for file in ${debug_headers}; do \
 	  $(INSTALL_DATA) $${file} $(DESTDIR)${gxx_include_dir}/${debug_builddir}; done
-	$(mkinstalldirs) $(DESTDIR)${gxx_include_dir}/${parallel_builddir}
-	for file in ${parallel_headers}; do \
+	parallel_headers_install='${parallel_headers}';\
+	test -z "$$parallel_headers_install" || \
+	  $(mkinstalldirs) $(DESTDIR)${gxx_include_dir}/${parallel_builddir};\
+	for file in $$parallel_headers_install; do \
 	  $(INSTALL_DATA) $${file} $(DESTDIR)${gxx_include_dir}/${parallel_builddir}; done
 	$(mkinstalldirs) $(DESTDIR)${host_installdir}
 	for file in ${host_headers} ${host_headers_extra} \

libstdc++-v3/include/Makefile.in

@@ -1584,8 +1584,10 @@ install-headers:
 	$(mkinstalldirs) $(DESTDIR)${gxx_include_dir}/${debug_builddir}
 	for file in ${debug_headers}; do \
 	  $(INSTALL_DATA) $${file} $(DESTDIR)${gxx_include_dir}/${debug_builddir}; done
-	$(mkinstalldirs) $(DESTDIR)${gxx_include_dir}/${parallel_builddir}
-	for file in ${parallel_headers}; do \
+	parallel_headers_install='${parallel_headers}';\
+	test -z "$$parallel_headers_install" || \
+	  $(mkinstalldirs) $(DESTDIR)${gxx_include_dir}/${parallel_builddir};\
+	for file in $$parallel_headers_install; do \
 	  $(INSTALL_DATA) $${file} $(DESTDIR)${gxx_include_dir}/${parallel_builddir}; done
 	$(mkinstalldirs) $(DESTDIR)${host_installdir}
 	for file in ${host_headers} ${host_headers_extra} \