PR preprocessor/7358
	* c-opts.c (check_deps_environment_vars): Ignore main file
	for SUNPRO_DEPENDENCIES.
	* cppfiles.c (stack_include_file): Ignore main file if
	appropriate.
	* cpplib.h (struct cpp_options): New member in deps.
	* doc/cppenv.texi: Update.

From-SVN: r56333