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Questions tagged [byte-compilation]

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is for the Emacs Lisp compiler in Emacs that compiles lisp code to byte-code for faster execution compared to uncompiled lisp code. Byte-compiled code is read by the byte-code interpreter.

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13
votes
3answers
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Defun inside let with lexical binding gives byte-compile warning “the function is not known to be defined”

I want to get the effect of a static variable by using defun inside of let with lexical binding to create a closure. However, when byte-compiling the file, I get a warning. Am I doing something wrong, ...
15
votes
1answer
4k views

suppress warning: assignment to free variable (and others)

How can I suppress the "assignment to free variable" warning when byte compiling an emacs lisp file? I'm actually mostly interested in suppressing it for a specific buffer when using flycheck, but I ...
28
votes
4answers
5k views

Can I avoid outdated byte-compiled elisp files?

Occasionally, when I start Emacs, I get a message like. Source file `/home/USER/.emacs.d/elpa/....el' newer than byte-compiled file Also, I sometimes edit a package I'm developing and forget to ...
6
votes
1answer
198 views

package.el: How can I avoid byte-compilation

How can I tell package.el to not byte-compile? It is generally OK to byte-compile installed packages but it makes difficult to test a new Emacs with byte compiler improvements (such as Emacs 26 from ...
3
votes
0answers
278 views

Byte-compiling a file loads macros with `(eval-and-compile)` but not `(eval-when-compile)`

I created a buffer, test1.el: (eval-when-compile (defmacro dummy-macro (_) nil) (dummy-macro s)) Trying to compile this file, I get the following errors: In toplevel form: test1.el:3:16:Warning:...
2
votes
1answer
161 views

Make a variable visible to some functions only

Consider the following metacode: ;;; -*- lexical-binding: t -*- (defvar var1 ...) (defvar var2 ...) (defun main () "Main entry point" ...) (defun func1 ...) (defun func2 ...) ... (defun funcn ...)...
1
vote
2answers
338 views

Does `load` prefer .elc files over .el files?

Do .elc files take precedence over .el files when using load? Say I have two files in my load path: foo.el and foo.elc. If I call (load "foo"), will the byte-compiled version (foo.elc) always be ...