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Re: [PATCH] Write dependency information (-M*) even if there are errors


Segher Boessenkool <segher@kernel.crashing.org> writes:

> Patches should go to gcc-patches.

Ok, will keep in mind for future (seeing that we have a discussion
already it probably doesn't make sense to move this patch).

 
> Two spaces after a full stop (all three times).

Fixed, new revision included.


Thanks,
Boris
Index: gcc/c-family/ChangeLog
===================================================================
--- gcc/c-family/ChangeLog	(revision 250514)
+++ gcc/c-family/ChangeLog	(working copy)
@@ -1,3 +1,8 @@
+2017-08-06  Boris Kolpackov <boris@codesynthesis.com>
+
+	* c-opts.c (c_common_finish): Write dependency information even if
+	there are errors.
+
 2017-07-14  David Malcolm  <dmalcolm@redhat.com>
 
 	* c-common.c (try_to_locate_new_include_insertion_point): New
Index: gcc/c-family/c-opts.c
===================================================================
--- gcc/c-family/c-opts.c	(revision 250514)
+++ gcc/c-family/c-opts.c	(working copy)
@@ -1152,8 +1157,11 @@
 {
   FILE *deps_stream = NULL;
 
-  /* Don't write the deps file if there are errors.  */
-  if (cpp_opts->deps.style != DEPS_NONE && !seen_error ())
+  /* Note that we write the dependencies even if there are errors. This is
+     useful for handling outdated generated headers that now trigger errors
+     (for example, with #error) which would be resolved by re-generating
+     them. In a sense, this complements -MG.  */
+  if (cpp_opts->deps.style != DEPS_NONE)
     {
       /* If -M or -MM was seen without -MF, default output to the
 	 output stream.  */

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