re PR testsuite/42843 (--enable-build-with-cxx plugin tests fail)

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

1 files changed, 4 insertions, 2 deletions

diff --git a/gcc/doc/plugins.texi b/gcc/doc/plugins.texi
index 77000fee646..5a560424993 100644
--- a/gcc/doc/plugins.texi
+++ b/gcc/doc/plugins.texi
@@ -50,8 +50,10 @@ fatal error: plugin <name> is not licensed under a GPL-compatible license
 compilation terminated
 @end smallexample
 
-The type of the symbol is irrelevant.  The compiler merely asserts that
-it exists in the global scope.  Something like this is enough:
+The declared type of the symbol should be int, to match a forward declaration
+in @file{gcc-plugin.h} that suppresses C++ mangling.  It does not need to be in
+any allocated section, though.  The compiler merely asserts that
+the symbol exists in the global scope.  Something like this is enough:
 
 @smallexample
 int plugin_is_GPL_compatible;