feature/native-comp b818a49 2/2: Fix loading of libgccjit.dll while dumping in Windows.

[Andrea Corallo]

branch: feature/native-comp
commit b818a49f667a77b7627c678fb4a2ca014f43695e
Author: Nicolás Bértolo <nicolasbertolo@gmail.com>
Commit: Andrea Corallo <akrl@sdf.org>

    Fix loading of libgccjit.dll while dumping in Windows.
    
    loadup.el calls `native-comp-available-p', that calls
    load_gccjit_if_necessary() in Windows. That function tries to load
    libgccjit using the mappings defined in `dynamic-library-alist'. That
    mapping is filled by term/w32-win.el, but that file may be loaded too
    late.
    
    * src/emacs.c (syms_of_emacs): Add libgccjit to the
    `dynamic-library-alist' used when starting to dump so
    `native-comp-available-p' always works in Windows.
---
 src/emacs.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/emacs.c b/src/emacs.c
index cd4f7a0..8ecf9b4 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -3052,7 +3052,18 @@ because they do not depend on external libraries and are 
always available.
 
 Also note that this is not a generic facility for accessing external
 libraries; only those already known by Emacs will be loaded.  */);
+#ifdef WINDOWSNT
+  /* We may need to load libgccjit when dumping before term/w32-win.el
+     defines `dynamic-library-alist`. This will fail if that variable
+     is empty, so add libgccjit.dll to it.  */
+  if (will_dump_p ())
+    Vdynamic_library_alist = list1 (list2 (Qgccjit,
+                                           build_string ("libgccjit.dll")));
+  else
+    Vdynamic_library_alist = Qnil;
+#else
   Vdynamic_library_alist = Qnil;
+#endif
   Fput (intern_c_string ("dynamic-library-alist"), Qrisky_local_variable, Qt);
 
 #ifdef WINDOWSNT