Simpler way to export HAVE_X_WINDOWS to GDB

* src/.gdbinit: Simplify by removing dependency on globals
implementation.  This is useful for a future performance
improvement that I have in mind.
* src/alloc.c (enum defined_HAVE_X_WINDOWS, defined_HAVE_X_WINDOWS):
New enum and constant.
(gdb_make_enums_visible) [__GNUC__]: Use it, to make
defined_HAVE_X_WINDOWS visible to GDB.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 3a8bd30c34b..e48807c49ad 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -7649,6 +7649,12 @@ than 2**N, where N is this variable's value.  N should be nonnegative.  */);
   defsubr (&Ssuspicious_object);
 }
 
+#ifdef HAVE_X_WINDOWS
+enum defined_HAVE_X_WINDOWS { defined_HAVE_X_WINDOWS = true };
+#else
+enum defined_HAVE_X_WINDOWS { defined_HAVE_X_WINDOWS = false };
+#endif
+
 /* When compiled with GCC, GDB might say "No enum type named
    pvec_type" if we don't have at least one symbol with that type, and
    then xbacktrace could fail.  Similarly for the other enums and
@@ -7667,5 +7673,6 @@ union
   enum MAX_ALLOCA MAX_ALLOCA;
   enum More_Lisp_Bits More_Lisp_Bits;
   enum pvec_type pvec_type;
+  enum defined_HAVE_X_WINDOWS defined_HAVE_X_WINDOWS;
 } const EXTERNALLY_VISIBLE gdb_make_enums_visible = {0};
 #endif  /* __GNUC__ */