test: minimize impact of native compilation.

Native compilation is kindof useless in the test suite because we
throw away the cache after every subtest.  The test suite could in
principle share an eln cache within a given test file; for now try to
minimize the amount of native-compilation. There is an intermittent
bug where emacs loses track of its default-directory; I suspect (but
have no proof) that bug is related to native compilation and/or race
conditions. This patch seems to prevent that bug (or at least reduce
its frequency).

diff --git a/test/test-lib.el b/test/test-lib.el
index 236dd99edc9da97e4903831ce85127aaa2470082..4cfb8ef163aac196558c81adae112091661036ff 100644 (file)
--- a/test/test-lib.el
+++ b/test/test-lib.el
@@ -22,6 +22,15 @@
 
 ;;; Code:
 
+;; minimize impact of native compilation on the test suite.
+;; These are the Emacs 29.1 version of the variables.
+;; Leave trampolines enabled per Emacs upstream recommendations.
+;; It is important to set these variables before loading any
+;; .elc files.
+(setq native-comp-jit-compilation nil)
+(setq native-comp-speed -1)
+(setq native-comp-async-jobs-number 1)
+
 (require 'cl-lib)
 
 ;; Ensure that the dynamic variables that are defined by this library