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-rw-r--r--lisp/emacs-lisp/comp.el13
1 files changed, 12 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/comp.el b/lisp/emacs-lisp/comp.el
index c242c5c871e..184aef489dc 100644
--- a/lisp/emacs-lisp/comp.el
+++ b/lisp/emacs-lisp/comp.el
@@ -124,7 +124,18 @@ Usable to modify the compiler environment."
:type 'list)
(defcustom comp-async-report-warnings-errors t
- "Whether to report warnings and errors from asynchronous native compilation."
+ "Whether to report warnings and errors from asynchronous native compilation.
+
+When native compilation happens asynchronously this can produce
+warnings and errors, some of these diagnostic messages might not be
+emitted by the first synchronous byte-compilation. The typical case
+for that is byte-compiling a file that is missing to require a
+necessary feature while having it already loaded into the environment.
+
+As asynchronous native compilation always starts from a fresh
+environment it is more sensitive into highlighting issues about non
+consistent source files and might not be able to compile correctly
+these."
:type 'boolean)
(defcustom comp-async-query-on-exit nil