[gcc r12-4444] Darwin, D: Fix D bootstrap, include tm-dwarf2.h.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:a01704fc45a727fbfc4999983b3e8886c0f86fed

commit r12-4444-ga01704fc45a727fbfc4999983b3e8886c0f86fed
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Fri Oct 15 17:23:08 2021 +0100

    Darwin, D: Fix D bootstrap, include tm-dwarf2.h.
    
    After r12-4432-g7bfe7d634f60b0a9 Darwin fails to bootstrap with D
    enabled since there is no definition of either DWARF2_DEBUG_INFO or
    PREFERRED_DEBUGGING_TYPE.
    
    Fixed here by adding the tm-dwarf2.h file to tm_d_file for Darwin.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    gcc/ChangeLog:
    
            * config.gcc: Add tm-dwarf2.h to tm_d-file.

Diff:
---
 gcc/config.gcc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index aa5bd5d1459..3675e063a53 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -666,6 +666,7 @@ case ${target} in
 *-*-darwin*)
   tmake_file="t-darwin "
   tm_file="${tm_file} darwin.h"
+  tm_d_file="${tm_d_file} tm-dwarf2.h"
   darwin_os=`echo ${target} | sed 's/.*darwin\([0-9.]*\).*$/\1/'`
   darwin_maj=`expr "$darwin_os" : '\([0-9]*\).*'`
   macos_min=`expr "$darwin_os" : '[0-9]*\.\([0-9]*\).*'`