[gcc r13-5328] Bugfix ensure RTentity is a dependent of RTco.cc

[gcc r13-5328] Bugfix ensure RTentity is a dependent of RTco.cc

[Gaius Mulley]

https://gcc.gnu.org/g:b061fc94d70dc82f554eeb94434cf03cd5af03f7

commit r13-5328-gb061fc94d70dc82f554eeb94434cf03cd5af03f7
Author: Gaius Mulley <gaiusmod2@gmail.com>
Date:   Tue Jan 24 17:33:18 2023 +0000

    Bugfix ensure RTentity is a dependent of RTco.cc
    
    RTco is a definition for C module and therefore there is no
    RTco.mod.  The RTco.cc uses RTentity and the import in RTco.def
    ensures that cc1gm2 can build a graph of all dependencies
    should -fscaffold-static be used.
    
    gcc/m2/ChangeLog:
    
            * gm2-libs-iso/RTco.def: Import RTentity.
            Declare RTco as a definition for C module.
    
    Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>

Diff:
---
 gcc/m2/gm2-libs-iso/RTco.def | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/m2/gm2-libs-iso/RTco.def b/gcc/m2/gm2-libs-iso/RTco.def
index 33452bac990..5285a7deb10 100644
--- a/gcc/m2/gm2-libs-iso/RTco.def
+++ b/gcc/m2/gm2-libs-iso/RTco.def
@@ -24,10 +24,12 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  *)
 
-DEFINITION MODULE RTco ;
+DEFINITION MODULE FOR "C" RTco ;
 
 FROM SYSTEM IMPORT ADDRESS ;
 
+IMPORT RTentity ;  (* Imported so the initialization call graph
+                      understands that RTco.cc depends upon RTentity.  *)
 
 (* init initializes the module and allows the application to lazily invoke threads.  *)