Questions tagged [byte-compilation]
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.
84
questions
4
votes
0answers
214 views
Is there an ELISP decompiler?
I'm thinking of writing one so that when I get those horrible tracebacks from bytecode files, I can better see where I was at.
Is there one already?
Are there any other tools for showing an error ...
0
votes
0answers
26 views
Flycheck and analysis at byte compile time
I have a trivial question related to annoyed Flycheck warnings.
Why for such trivial code:
(add-hook 'after-init-hook
#'(lambda ()
(require 'server)
(unless (...
4
votes
1answer
202 views
Why are custom themes not usually byte-compiled?
Three pieces of evidence suggest custom themes should not be byte-compiled:
All built-in themes under etc/themes specify no-byte-compile: t.
The function custom-available-themes considers only .el ...
1
vote
2answers
30 views
`rx` form, that is partially compiled, partially variable?
Is it possible to obtain an (rx ...) form, that is expanded at compile time for performance, but partially variable?
rx-to-string may be slow
For instance I want an expression that behaves ...
0
votes
1answer
22 views
How to byte-compile a file in the background?
To cut time on untangling my org setup file, I now only compile on save.
However it is somewhat annoying to have the compile buffer popup on every save.
;; Only untangle on a change/save
(defun ...
1
vote
3answers
412 views
error: Invalid byte opcode: op=183, ptr=2
I byte-compile my ~/.emacs.d/init.el. It was done by Emacs 26.1 from Cygwin and I got error when load emacs-nox 25.2 from Debian WSL:
error: Invalid byte opcode: op=183, ptr=2
Were new opcodes ...
4
votes
0answers
88 views
Which Lisp objects are byte-compiled?
A compiled program and a source code can be interpreted differently at runtime. The issue is that some Lisp objects should not be modified because of the byte-compilation.
Emacs Lisp manual: 2.7 ...
2
votes
1answer
42 views
*Compile-log* buffer warning
I am a newbie to Emacs Lisp. started Emacs and the *Compile-log* buffer shows the following logs which I don't have much clue of. I was trying to install Magit and Helm.
should anything in this log ...
1
vote
1answer
27 views
Which site-lisp file was loaded, default.el or default.elc?
I'm setting up some site-wide default configuration in the site-lisp directory, and trying to figure out whether emacs is loading the byte-compiled default.elc or default.el. I haven't applied any ...
1
vote
1answer
20 views
Byte compilation still happening when `no-byte-compile` is t on adding advice
In org-mode, I have the following:
#+BEGIN_SRC emacs-lisp :results scalar
(setq no-byte-compile t)
(defun f ())
(defun g ())
(add-function :before (symbol-function 'f) 'g)
(symbol-function 'f)
#+...
6
votes
2answers
2k views
Debugging “Warning: Reference to free variable”
I have something like below (from the answer) in my init file:
(add-hook 'LaTeX-mode-hook 'my-latex-hook)
(defun my-latex-hook ()
(require 'tex-site)
(define-key LaTeX-mode-map "-" (lambda () (...
0
votes
1answer
23 views
Source file ‘c:/Users/…/AppData/Local/emacs-26.1-x86_64/share/emacs/26.1/lisp/progmodes/python.el’ newer than byte-compiled file
this message shows up on Emacs startup. what does it mean and how to get rid of it?
Source file ‘c:/Users/jcao/AppData/Local/emacs-26.1-x86_64/share/emacs/26.1/lisp/progmodes/python.el’ newer than ...
1
vote
1answer
37 views
Workaround for “Invalid search bound (wrong side of point)” in CC Mode
Emacs 24.x and 25.x have a bug in CC Mode which can result in some operations failing with the error
Invalid search bound (wrong side of point)
For example, I can reproduce it with the following ...
0
votes
0answers
83 views
How to manually byte-compile a package?
Looking at the package installed under elpa directory I see that it have been byte compiled and the structure is different from the source.
Consider the following example https://github.com/hlissner/...
0
votes
0answers
57 views
Slow package installation and multiple warnings
I have noticed that my emacs startup the first time while fetching all my packages using use-package and byte compiling everything is quite slow even though the number of packages is only 18.
My ...
4
votes
3answers
94 views
How do I get byte-compilation warnings about undefined variables?
The following code works fine with M-x eval-buffer, and byte-compiles without any warnings.
(eval-when-compile
(defconst demo-one 1))
(defvar demo-some-var
`(foo bar ,demo-one))
However, if I ...
3
votes
2answers
114 views
byte-compile and lexical-binding
Could someone in the know please help me understand what's going on here:
;; -*- lexical-binding: t; -*-
(let* ((a 0))
(let* ((a 1))
(funcall (byte-compile (lambda () a)))))
;;=> 0
wat? Not ...
4
votes
0answers
1k views
byte-compile much slower in X (vs. -nw)
Setup
Windows 10 host with X server (VcXsrv)
Linux guest (Arch) in virtual machine (VMware)
Benchmark
(defmacro measure-time (&rest body)
"Measure the time it takes to evaluate BODY."
`(let ...
0
votes
1answer
41 views
Byte-compilation and “uninterned” function names
Not quite a duplicate: this appears to be very similar to the situation described in an existing question. But my question is not "why does it happen", but rather "is there any way to keep using ...
2
votes
0answers
64 views
byte-compiling in presence of pcase patterns
TIL that trying to compile anything with pcase matching in it may lead to an explosion of code generated during expansion. Even the most innocent looking patterns may generate hundreds of branches and ...
2
votes
1answer
143 views
What effect does eval-and-compile have on a defun-within-let?
The byte-compiler does not currently seem to recognise that a function has been defined when using defun within a let expression under lexical-binding, as explained in Stefan's answer to this question....
11
votes
2answers
1k views
`Warning (bytecomp)` is a bit vague - can I get any more information?
When I start emacs, I get a couple of byte compilation warnings in a window that pops up:
Warning (bytecomp): `interactive-p' is an obsolete function (as of 23.2); use `called-interactively-p' ...
4
votes
0answers
41 views
A workflow for managing compiled elisp packages with different versions of emacs
I am using different versions of emacs, on different computers. On some of those (work computers) I don't really have a choice to update, whereas for my personal computers, I like to run the latest ...
3
votes
1answer
76 views
How to get Emacs to know that a symbol has a function definition
While reading the source file prelude-ivy.el in the Prelude modules directory, I saw that there was a warning associated with "here" in the last line, specifically that prelude-required-packages was ...
0
votes
1answer
79 views
Byte complie predictive mode
I'm trying to byte compile predictive mode and I have an issue that I can't solve. If I clone it from the official repo, and make it, I get:
In toplevel form:
predictive-auto-overlay-auto-dict.el:35:...
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 ...)...
0
votes
1answer
53 views
eval-when-compile statements not running in files required by compiled file
I've got one file including
(eval-when-compile (require 'cl))
Some other files require this file, and also need to have cl required when they are byte-compiled. This is not happening - this first ...
13
votes
3answers
340 views
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, ...
0
votes
2answers
87 views
Generating a single byte-compiled file from more sources
I have a relatively large elisp file which starts becoming hard to maintain and I am going to split it into smaller files.
However, for my use case, it would be still convenient to have a single byte-...
3
votes
2answers
268 views
Disassembly of a bytecode *file*?
There is a disassembler for functions, but is there something that will disassemble a bytecode file?
Thoughts on how to accomplish?
1
vote
1answer
133 views
Can we force emacs to not load byte compiled files?
I would like Emacs to not use byte-compiled files because the stack-trace is really messy.
So for my own elisp files, I can add ;; -*-no-byte-compile: t; -*- to disallow byte-compilation.
But how ...
0
votes
1answer
156 views
Ignore byte-compiled files without source file
I recently refactored my Emacs config, part of which involved deleting some old files which had been byte-compiled.
My new configuration (ab)uses the load-dir package to load all my customisation ...
1
vote
1answer
724 views
How do you recompile an .el source file and make it active in my current session
I have been writing some elisp code, current i have to open the file edit quit and reload emacs seems there must be a better way ?
I know i can recompile the current file but that does not seem to ...
3
votes
2answers
131 views
Can one inhibit eval-when-compile?
There is an eval-when-compile macro but, AFAICT, no eval-when-not-compiling or load-time-only, that would be very convenient for me now. Do you know any generic workaround?
Why do I need this: I ...
4
votes
2answers
410 views
Where are these variables defined? - bytecomp Warnings
Lately I'm getting warnings when compiling the .emacs
Warning (bytecomp): reference to free variable ‘url-http-extra-headers’
Warning (bytecomp): reference to free variable ‘oauth--token-data’
...
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 ...
1
vote
1answer
41 views
What does `#[0` (hash angle bracket 0) mean in the elisp debugger?
When using the debugger
I get lines like the following in the stack trace:
#[0 "\302\303!\210\300\211\207" [describe-input-method this-command helm-mode 1] 2 "\n\n(fn)"]()
I have no clue what the #[...
1
vote
1answer
56 views
Requiring user-installed packages from byte-compiled .emacs
I have the following in my .emacs.el:
(when (require 'edit-server nil t)
(custom-set-variables
'(edit-server-default-major-mode 'markdown-mode)
'(edit-server-new-frame nil))
(edit-server-...
6
votes
0answers
103 views
How to build Emacs without byte-compiling Lisp files
Q: Is there an option to build Emacs without byte-compiling the Lisp files?
BACKGROUND: The length of time needed to build Emacs makes debugging / developing an extremely slow process. For example,...
0
votes
1answer
41 views
`error' called with 1 args to fill 0 format field(s)
I'm getting an error called with 1 args to fill 0 format field(s) error when byte-compiling cider-repl-history.el with Emacs 24.4 and 24.5. No such error is reported for Emacs 25.1.
Line 422 of cider-...
2
votes
1answer
338 views
Function might not be defined at runtim
To use directory-files-recursively in Emacs 24.x, I'm adding the following to a file cider-compat.el:
(eval-and-compile
(unless (fboundp 'directory-files-recursively)
(defun directory-files-...
4
votes
2answers
163 views
Prevent byte-compiler warnings after requiring features
In Elisp packages, we sometimes want to use a feature only if the user has installed another package without specifying that package as a dependency for our own. E.g.
(when (require 'markdown-mode ...
3
votes
1answer
59 views
When I (byte-compile-file “my-package.el”), can I treat warnings as errors?
As part of CI testing, I'm byte-compiling package files to make sure there are no errors. I'd like to take this a step further and ensure there are no warnings, either (like 'function not known to be ...
0
votes
1answer
184 views
is byte-compile-dynamic compatible with use-package?
If I'm using use-package in a file that I plan to byte-compile, can I still leverage Emacs' byte-compile-dynamic setting to lazy-load compiled function definitions? From the Elisp manual:
With ...
0
votes
0answers
64 views
Byte Compiling Functions Using `defalias` for `progn`
The following code:
(defalias 'new-progn 'progn)
(defun foo ()
(new-progn "foo"))
(byte-compile 'foo)
(foo)
gives this error:
Debugger entered--Lisp error: (invalid-function #<subr progn>)
...
1
vote
1answer
194 views
Emacs init.el warning
When I load up emacs for the first time I get this warning
Warning (bytecomp): ‘font-lock-fontify-buffer’ is for interactive use only; use ‘font-lock-ensure’ or ‘font-lock-flush’ instead. [2 times]
...
1
vote
1answer
45 views
w32-short-file-name: multi-OS user-configuration — silence byte-compiler
I have a multi-OS user-configuration. On OSX, when I byte-compile, the function w32-short-file-name is not defined (which is okay). What is the proper way to silence the byte-compiler for this ...
8
votes
1answer
433 views
eval-when-compile: defsubst vs defmacro vs define-inline
I defined some simple functions in init.el, for example my-cache-file:
(defconst my-cache-directory
(expand-file-name ".cache" user-emacs-directory)) ; ~/.emacs/.cache
(defun my-cache-file (x)
(...
1
vote
1answer
284 views
Fixing “reference/assignment to free variable” warning during compilation if variable is dynamically bounded
For:
(defun my-ag/font-lock-extend-region ()
(save-excursion
(goto-char font-lock-beg)
(forward-line 2)
(setq font-lock-beg (point))))
I've got:
Warning: reference to free variable '...
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 ...
