gcc:
	PR testsuite/42843
	* gcc-plugin.h (int plugin_is_GPL_compatible): Declare as extern "C".
	* doc/plugins.texi (Plugin license check): Update information
	on type of plugin_is_GPL_compatible.
	* Makefile.in (PLUGINCC): Define as $(COMPILER).
	(PLUGINCFLAGS): Define as $(COMPILER_FLAGS).
gcc/testsuite:
	PR testsuite/42843
	* gcc.dg/plugin/selfassign.c (pass_warn_self_assign): Use enumerator
	TV_NONE to initialize tv_id field.
	* g++.dg/plugin/selfassign.c (pass_warn_self_assign): Likewise.
	* gcc.dg/plugin/one_time_plugin.c (one_pass): Likewise.
	* g++.dg/plugin/dumb_plugin.c (pass_dumb_plugin_example): Likewise.
	Include toplev.h .
	* gcc.dg/plugin/finish_unit_plugin.c: Include cgraph.h.
	* g++.dg/plugin/attribute_plugin.c: Include toplev.h and plugin.h .
	* g++.dg/plugin/pragma_plugin.c: Include toplev.h .

From-SVN: r160461