Issue a warning when eln look-up fails due to missing .el source file.

	* lisp/emacs-lisp/comp.el (comp-warning-on-missing-source): New
	customize.
	* src/lread.c (maybe_swap_for_eln): Issue a warning when eln
	look-up fails due to missing .el source file.
	* src/comp.c (syms_of_comp): Define
	'Qcomp_warning_on_missing_source'.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/comp.c b/src/comp.c
index eb734d5833d..67c8e39315b 100644
--- a/src/comp.c
+++ b/src/comp.c
@@ -5254,7 +5254,8 @@ compiled one.  */);
   DEFSYM (Qlate, "late");
   DEFSYM (Qlambda_fixup, "lambda-fixup");
   DEFSYM (Qgccjit, "gccjit");
-  DEFSYM (Qcomp_subr_trampoline_install, "comp-subr-trampoline-install")
+  DEFSYM (Qcomp_subr_trampoline_install, "comp-subr-trampoline-install");
+  DEFSYM (Qcomp_warning_on_missing_source, "comp-warning-on-missing-source");
 
   /* To be signaled by the compiler.  */
   DEFSYM (Qnative_compiler_error, "native-compiler-error");