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.
105
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“assignment to free variable” warning after defvar
The compiler will issue a warning message
Warning: assignment to free variable -/var
if you evaluate the following forms:
;;; -*- lexical-binding: t; -*-
(defvar -/var)
(byte-compile (let (_)
...
- 4,638
1
vote
1
answer
54
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Make the linter aware of autoloads for init files using package-quickstart
If I try to call an autoloaded function inside my init.el file, it will get executed normally.
However, the byte compiler will give me warnings about undeclared functions. This applies for all user-...
- 135
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0
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38
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When using `cl-labels` or `cl-flet` shouldn't the compiler catch signature msmatches
I was expecting a compilation error for the snippet below... unfortunately compilation goes through without any errors, but it errors during runtime.
Run-time error is expected, so no surprise there. ...
user39778
0
votes
1
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106
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Squelching all byte and native compilation warnings from batch package installation
I have to copy my .emacs.d to different computers a lot, so I keep init.el etc in version control and pair it with a batch Elisp script that re-downloads all of my selected packages. I'd like this ...
- 272
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20
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How to avoid byte-compiler warnings when putting a defconst into a let?
I want to define a few constants in my emacs init file, based on running some code, like this:
(let* ((var1 ...) (var2 ...)
... more code here...
(defconst env-is-ok (or var1 var2))
(defconst ...
- 496
0
votes
1
answer
77
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Upgrade from 27.2 to 30.0, calling sequence change for "make-obsolete-variable"
I'm trying to upgrade from emacs-27.2 to emacs-30.0.50 under Ubuntu GNU/Linux.
Now, when I use emacs-30.0.50, I get this error on startup:
Wrong number of arguments: make-obsolete-variable, 2
I ...
- 594
3
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1
answer
45
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Can you mark the end of 'compilation' in an eLisp source file?
In all of my source files, in whatever language, I use some trick or other to end compilation and then add a documentation trailer in perldoc format from which I can generate a man page. I always keep ...
- 31
-3
votes
1
answer
79
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eval-when-compile in terms of minor-mode development
I'd like to know when a developer should use eval-when-compile despite the fact that at first glance everything works without eval-when-compile.
When does not using eval-when-compile lead to ...
- 1
0
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1
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43
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Byte compile setup
What byte compile setup can I use when writing my init files?
Have been doing M-x byte-compile-file directly. Would like to do a function that calls byte-compile-file on the current buffer.
- 1
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63
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How to disassemble an lambda/anonymous function given its hex adress but not name?
Assume that we have:
(defalias 'my-f (lambda () (message "a")))
(byte-compile 'my-f)
=> #f(compiled-function
()
#<bytecode 0x1dc01052127a>)
(setq my-g (byte-compile (...
- 180
2
votes
1
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171
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Which byte-compile-file is my Emacs using? Function signature in describe-function differs to that in bytecomp.el
After reviewing some functions in my own dot-emacs files, I've noticed that the function signature that describe-function shows for byte-compile-file differs to that for the function definition in the ...
- 60
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2
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Is there a way to determine if emacs uses the byte compiled or the natively compiled code of a function?
Say, there is some function and if I do a describe-function on it it says:
x is an interactive compiled Lisp function in x.el
Can I tell somehow if this loaded compiled code is byte compiled or ...
- 1,190
0
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1
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340
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Errors with use-package after upgrading package
I load modus-themes (among other packages) in my Emacs configuration using:
(setq package-archives '(("gnu" . "https://elpa.gnu.org/packages/")
("melpa" . &...
- 201
1
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1
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91
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How to revert org-ctrl-c-tab in Org?
I accidentaly pressed the keys C-c C-i which executed the command org-ctrl-c-tab.
According to the self-documentation:
org-ctrl-c-tab is an interactive and byte-compiled function defined in
org.el.gz.
...
- 1,409
4
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1
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128
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How do you find all macro calls in an elisp file?
I am trying to make sure a package that is installed from Melpa (org-ref) byte compiles correctly, and a typical issue is related to the use of macros. For example, if I use org-with-wide-buffer which ...
- 11.6k
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1
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99
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Why is byte compiler issuing a warning on one of these 2 de Morgan equivalent expressions?
Assuming that the symbol foo is not defined nor declared with a defvar or let form, the following code generates a byte-compiler warning in Emacs 26.3 and 27.2:
(defun f-or ()
"Use or."
(...
- 786
4
votes
1
answer
295
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eval-when-compile and eval-and-compile identical definitions?
How can eval-when-compile and eval-and-compile have different behavior if their definitions are identical?
From byte-run.el:
(defmacro eval-when-compile (&rest body)
;; ... documentation string ...
- 1,938
3
votes
1
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153
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Avoiding warnings of undefined functions while compiling
I have a lot of code in my init file like this:
(when library-is-available
;; Code that use that uses functions from library
)
However, I get warnings that the functions that I am using are not ...
- 1,609
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0
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70
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How to properly advise macros used by functions if earlier byte-compilation is present?
I am trying to customize the looks of org-agenda and, in order to do so, I would like to advice the macro org-agenda--insert-overriding-header; this macro appears to be used in several functions. ...
- 95
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0
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33
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Is there a way to change the unibyte string bytecode output of `byte-compile` to hex?
Given a byte-compiled function:
(byte-compile (defun factorial (integer)
"Compute factorial of an integer."
(if (= 1 integer) 1
(* integer (...
- 550
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0
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48
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Mutually recursive bytecode function throws an error when I try to eval
The following workflow contains the steps needed to reproduce the error:
;; Byte-compile the function.
(byte-compile '(defun flatten (x)
(cl-labels ((rec (x acc)
...
- 550
0
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1
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101
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Can you detect if a byte-compiled elisp file was not compiled by the current emacs?
Is there a way to tell if the current *.elc files were not compiled with the current Emacs?
I am trying to detect an error where emacs is updated, but old .elc files are left in the user elpa ...
- 11.6k
1
vote
2
answers
579
views
Byte compilation error with use-package
The beginning of my ~/.emacs.d/init.el file looks like this:
;; MELPA
(require 'package)
(setq package-enable-at-startup nil)
(setq package-check-signature nil)
(add-to-list 'package-archives '("...
- 719
1
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2
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85
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 ...
- 1,561
0
votes
1
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99
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 ...
- 564
4
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0
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173
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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 ...
user19761
3
votes
1
answer
537
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*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 ...
- 105
2
votes
1
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193
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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 ...
- 1,938
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1
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86
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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)
#+...
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1
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36
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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 ...
- 105
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1
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478
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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 ...
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0
answers
456
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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/...
- 103
4
votes
3
answers
333
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 ...
- 6,910
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0
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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 ...
- 1,049
3
votes
2
answers
250
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 ...
- 335
0
votes
1
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55
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 ...
user8782
2
votes
0
answers
95
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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 ...
- 335
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3
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728
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 ...
- 3,362
4
votes
0
answers
66
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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 ...
- 4,263
3
votes
1
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103
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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 ...
- 399
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votes
1
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89
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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:...
- 203
4
votes
1
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245
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 ...)...
- 1,792
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2
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195
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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-...
- 1,792
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vote
1
answer
882
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 ...
- 239
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1
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90
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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 ...
- 227
3
votes
2
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207
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 ...
- 1,105
5
votes
2
answers
741
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’
...
- 965
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1
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325
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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 ...
- 12.2k
6
votes
1
answer
469
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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 ...
- 2,151
3
votes
2
answers
392
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?
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