cpptrad.c (_cpp_scan_out_logical_line): Improve test for whether directive…

cpptrad.c (_cpp_scan_out_logical_line): Improve test for whether directive begins at the beginning of a line.

	* cpptrad.c (_cpp_scan_out_logical_line): Improve test for
	whether directive begins at the beginning of a line.

	(testsuite)
	* gcc.dg/cpp/trad/xwin1.c: New test case.

From-SVN: r73740

gcc/ChangeLog

+2003-11-19  Nathanael Nerode  <neroden@gcc.gnu.org>
+
+	* cpptrad.c (_cpp_scan_out_logical_line): Improve test for
+	whether directive begins at the beginning of a line.
+
 2003-11-19  Richard Sandiford  <rsandifo@redhat.com>
 
 	* config/frv/frv.c (frv_init_libfuncs): Correct ufix_optab entries.

gcc/cpptrad.c

@@ -350,6 +350,7 @@ _cpp_scan_out_logical_line (cpp_reader *pfile, cpp_macro *macro)
   unsigned int c, paren_depth = 0, quote;
   enum ls lex_state = ls_none;
   bool header_ok;
+  const uchar *start_of_input_line;
 
   fmacro.buff = NULL;
 
@@ -359,6 +360,9 @@ _cpp_scan_out_logical_line (cpp_reader *pfile, cpp_macro *macro)
   RLIMIT (pfile->context) = pfile->buffer->rlimit;
   pfile->out.cur = pfile->out.base;
   pfile->out.first_line = pfile->line;
+  /* start_of_input_line is needed to make sure that directives really,
+     really start at the first character of the line. */
+  start_of_input_line = pfile->buffer->cur;
  new_context:
   context = pfile->context;
   cur = CUR (context);
@@ -581,7 +585,7 @@ _cpp_scan_out_logical_line (cpp_reader *pfile, cpp_macro *macro)
 	  break;
 
 	case '#':
-	  if (out - 1 == pfile->out.base
+	  if (cur - 1 == start_of_input_line
 	      /* A '#' from a macro doesn't start a directive.  */
 	      && !pfile->context->prev
 	      && !pfile->state.in_directive)

gcc/testsuite/ChangeLog

+2003-11-19  Nathanael Nerode  <neroden@gcc.gnu.org>
+
+	* gcc.dg/cpp/trad/xwin1.c: New test case.
+
 2003-11-19  Andreas Tobler  <a.tobler@schweiz.ch>
 
 	* g++.dg/compat/compat.exp: Add DYLD_LIBRARY_PATH for darwin.

gcc/testsuite/gcc.dg/cpp/trad/xwin1.c

+/* XWindows (as of 4.3) does some pretty strange things with cpp.
+   This tests one of them; the leading comments are supposed to be
+   eaten by the preprocessor; but the 'directives' after them are
+   supposed to be retained as text, not processed, so that imake's cpp
+   can be run on the output!
+   { dg-do preprocess }
+*/
+
+/**/#if 0
+passed
+/**/#endif
+
+/* { dg-final { scan-file xwin1.i "(^|\n)#if 0" } } */