PR preprocessor/6521

	* cppfiles.c (handle_missing_header): Don't do anything
	different for <> includes.
doc:
	* cppopts.texi: Update documentation for -MG.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@53304 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3b3bede..7b47c8c 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2002-05-08  Robert Spier <rspier@pobox.com>
+           Neil Booth  <neil@daikokuya.demon.co.uk>
+
+       PR preprocessor/6521
+       * cppfiles.c (handle_missing_header): Don't do anything
+       different for <> includes.
+doc:
+       * cppopts.texi: Update documentation for -MG.
+
 2002-05-08  Neil Booth  <neil@daikokuya.demon.co.uk>
 
        * cpplex.c (cpp_interpret_charconst): Truncate as well as

diff --git a/gcc/cppfiles.c b/gcc/cppfiles.c
index 7600523..70ac978 100644 (file)
--- a/gcc/cppfiles.c
+++ b/gcc/cppfiles.c
@@ -658,30 +658,7 @@ handle_missing_header (pfile, fname, angle_brackets)
   int print_dep = CPP_PRINT_DEPS(pfile) > (angle_brackets || pfile->map->sysp);
 
   if (CPP_OPTION (pfile, print_deps_missing_files) && print_dep)
-    {
-      if (!angle_brackets || IS_ABSOLUTE_PATHNAME (fname))
-       deps_add_dep (pfile->deps, fname);
-      else
-       {
-         /* If requested as a system header, assume it belongs in
-            the first system header directory.  */
-         struct search_path *ptr = CPP_OPTION (pfile, bracket_include);
-         char *p;
-         int len = 0, fname_len = strlen (fname);
-
-         if (ptr)
-           len = ptr->len;
-
-         p = (char *) alloca (len + fname_len + 2);
-         if (len)
-           {
-             memcpy (p, ptr->name, len);
-             p[len++] = '/';
-           }
-         memcpy (p + len, fname, fname_len + 1);
-         deps_add_dep (pfile->deps, p);
-       }
-    }
+    deps_add_dep (pfile->deps, fname);
   /* If -M was specified, then don't count this as an error, because
      we can still produce correct output.  Otherwise, we can't produce
      correct output, because there may be dependencies we need inside

diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi
index 68bd439..7a2ce50 100644 (file)
--- a/gcc/doc/cppopts.texi
+++ b/gcc/doc/cppopts.texi
@@ -204,10 +204,13 @@ When used with the driver options @option{-MD} or @option{-MMD},
 
 @item -MG
 @opindex MG
-When used with @option{-M} or @option{-MM}, @option{-MG} says to treat missing
-header files as generated files and assume they live in the same
-directory as the source file.  It suppresses preprocessed output, as a
-missing header file is ordinarily an error.
+In conjunction with an option such as @option{-M} requesting
+dependency generation, @option{-MG} assumes missing header files are
+generated files and adds them to the dependency list without raising
+an error.  The dependency filename is taken directly from the
+@code{#include} directive without prepending any path.  @option{-MG}
+also suppresses preprocessed output, as a missing header file renders
+this useless.
 
 This feature is used in automatic updating of makefiles.