directives-only.c: New file.

	libcpp/
	* directives-only.c: New file.
	* internal.h (struct _cpp_dir_only_callbacks): New.
	(_cpp_preprocess_dir_only): New function.
	* directives.c (_cpp_handle_directive): Check directives_only before
	disabling execution of indented directives.
	* files.c (_cpp_stack_file): Add directives_only check.
	* include/cpplib.h (struct cpp_options): Add directives_only.
	(cpp_init_special_builtins): New function.
	* init.c (cpp_init_special_builtins): New function.
	(cpp_init_builtins): Move builtin_array initialization to
	cpp_init_special_builtins.
	(post_options): Check directives_only before setting
	pfile->state.prevent_expansion = 1.
	* macro.c (_cpp_builtin_macro_text): Print an error if __COUNTER__
	is expanded inside a directive while -fdirectives-only is enabled.
	* Makefile.in (libcpp_a_OBJS): Add directives-only.o.
	(libcpp_a_SOURCES): Add directives-only.c.

	gcc/
	* c-ppoutput.c (print_lines_directives_only): New function.
	(scan_translation_unit_directives_only): New function.
	(preprocess_file): Add call to scan_translation_unit_directives_only.
	* c-opts.c (c_common_handle_option): Add OPT_fdirectives_only.
	(sanitize_cpp_opts): Add default flag_dump_macros setting for
	-fdirectives-only.  Add errors for -fdirectives-only conflict with
	-Wunused-macros and -traditional.
	(finish_options): Add builtin macro initialization for
	-fdirectives-only + -fpreprocessed.
	* c.opt (fdirectives-only): New.
	* doc/cppopts.texi (fdirectives-only): New.

	gcc/testsuite/
	* gcc.dg/cpp/counter-2.c: New test.
	* gcc.dg/cpp/counter-3.c: New test.
	* gcc.dg/cpp/dir-only-1.c: New test.
	* gcc.dg/cpp/dir-only-1.h: New file.
	* gcc.dg/cpp/dir-only-2.c: New test.
	* gcc.dg/cpp/dir-only-3.c: New test.
	* gcc.dg/cpp/dir-only-3a.h: New file.
	* gcc.dg/cpp/dir-only-3b.h: New file.
	* gcc.dg/cpp/dir-only-4.c: New test.
	* gcc.dg/cpp/dir-only-5.c: New test.
	* gcc.dg/cpp/dir-only-6.c: New test.

From-SVN: r127066

1 files changed, 18 insertions, 9 deletions

diff --git a/libcpp/init.c b/libcpp/init.c
index 71583df..62f4f95 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -350,11 +350,8 @@ mark_named_operators (cpp_reader *pfile)
     }
 }
 
-/* Read the builtins table above and enter them, and language-specific
-   macros, into the hash table.  HOSTED is true if this is a hosted
-   environment.  */
 void
-cpp_init_builtins (cpp_reader *pfile, int hosted)
+cpp_init_special_builtins (cpp_reader *pfile)
 {
   const struct builtin *b;
   size_t n = ARRAY_SIZE (builtin_array);
@@ -363,10 +360,7 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
     n -= 2;
   else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
 	   || CPP_OPTION (pfile, std))
-    {
-      n--;
-      _cpp_define_builtin (pfile, "__STDC__ 1");
-    }
+    n--;
 
   for (b = builtin_array; b < builtin_array + n; b++)
     {
@@ -375,6 +369,20 @@ cpp_init_builtins (cpp_reader *pfile, int hosted)
       hp->flags |= NODE_BUILTIN | NODE_WARN;
       hp->value.builtin = (enum builtin_type) b->value;
     }
+}
+
+/* Read the builtins table above and enter them, and language-specific
+   macros, into the hash table.  HOSTED is true if this is a hosted
+   environment.  */
+void
+cpp_init_builtins (cpp_reader *pfile, int hosted)
+{
+  cpp_init_special_builtins (pfile);
+
+  if (!CPP_OPTION (pfile, traditional)
+      && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
+	  || CPP_OPTION (pfile, std)))
+    _cpp_define_builtin (pfile, "__STDC__ 1");
 
   if (CPP_OPTION (pfile, cplusplus))
     _cpp_define_builtin (pfile, "__cplusplus 1");
@@ -622,7 +630,8 @@ post_options (cpp_reader *pfile)
      preprocessed text.  Read preprocesed source in ISO mode.  */
   if (CPP_OPTION (pfile, preprocessed))
     {
-      pfile->state.prevent_expansion = 1;
+      if (!CPP_OPTION (pfile, directives_only))
+	pfile->state.prevent_expansion = 1;
       CPP_OPTION (pfile, traditional) = 0;
     }