Hi!

"Hooray for the C programming language's module system"...  ;-)

On Fri, 23 Oct 2015 12:53:40 -0400, Andrew MacLeod <amacl...@redhat.com> wrote:
> Just finished running...  I think the external hard drive was slowing 
> down this run :-P  It took quite a while.
> 
> Anyway, this is the reduction patch independent of the header-ordering 
> patch... ie, that patch needs to be applied before this one.   So this 
> should be mostly just removals.   I also need to follow up and build all 
> the target and bootstrap from scratch to make sure there arent any 
> weirdnesses with it.   But you can at least get a look at it now.

Similar to the ENABLE_OFFLOADING preprocessor conditional as reported by
Cesar and Nathan, I've run into a problem with code "hidden" behind
ENABLE_FOLD_CHECKING, and this has independently also been reported as
<https://gcc.gnu.org/PR68166>:

    [...]/source-gcc/gcc/fold-const.c: In function 'tree_node* fold(tree)':
    [...]/source-gcc/gcc/fold-const.c:12038:18: error: aggregate 'md5_ctx ctx' 
has incomplete type and cannot be defined
       struct md5_ctx ctx;
                      ^

..., followed by many more errors.

As obvious, committed in r229652:

commit b7c78b0949974f6e22fa9a3f3eca665442641ec8
Author: tschwinge <tschwinge@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Mon Nov 2 07:42:04 2015 +0000

    [PR middle-end/68166] Restore build with fold checking enabled
    
        gcc/
        PR middle-end/68166
        * fold-const.c: Include "md5.h".
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@229652 
138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog    | 5 +++++
 gcc/fold-const.c | 1 +
 2 files changed, 6 insertions(+)

diff --git gcc/ChangeLog gcc/ChangeLog
index d927d35..966a7f9 100644
--- gcc/ChangeLog
+++ gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-11-02  Thomas Schwinge  <tho...@codesourcery.com>
+
+       PR middle-end/68166
+       * fold-const.c: Include "md5.h".
+
 2015-11-01  Jeff Law <j...@redhat.com>
 
        * vmsdbgout.c: Revert unused header file reduction patch.
diff --git gcc/fold-const.c gcc/fold-const.c
index 197ccfd..1a2fb810 100644
--- gcc/fold-const.c
+++ gcc/fold-const.c
@@ -71,6 +71,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "gimple-fold.h"
 #include "params.h"
 #include "tree-into-ssa.h"
+#include "md5.h"
 
 #ifndef LOAD_EXTEND_OP
 #define LOAD_EXTEND_OP(M) UNKNOWN


Grüße
 Thomas

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