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Questions tagged [c]

is for C source code editing, completions, formatting, compiling, folding, searching, executing, syntax checking, debugging, and other modern IDE features that Emacs supports.

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0 votes
1 answer
208 views

flycheck can't find header file even though flycheck-clang-include-path configured

I am using Doom Emacs as my editor for C. I'm trying to use glib in my C project and for that I'm including glib.h. I have added the include dirs displayed by pkg-config --cflags glib-2.0 to flycheck-...
0 votes
1 answer
216 views

CEDET semantic-complete-jump customization

When I search through project via semantic-complete-jump and tag is not unique (its defined in multiple places), I must hit <tab> to iterate through all possible places. Problem is, I horribly ...
0 votes
1 answer
93 views

Babel C++ blocks have incorrect indentation

When using a C++ source block in org-mode, the indentation doesn't match that of the C++ major mode. Viewing the source block in the org file: Viewing the same code in a C++ mode buffer or using org-...
0 votes
0 answers
20 views

How to use hideshow to fold the `#ifdef`

I use the package hideshow to fold/unfold codes. Recently I write some code to enable folding the #ifdef, #endif in c-mode like that (add-to-list 'hs-special-modes-alist '(c-mode &...
1 vote
1 answer
142 views

Is there a way to display breadcrumbs in C mode in a headerline or another window

I am using emacs (GNU Emacs 25.3.2) on Ubuntu. I was wondering if its possible to display short breadcrumbs or selected compound statement in a headerline (even another window is fine). Probably I am ...
0 votes
1 answer
947 views

How to toggle multi-line comment blocks?

Is it possible to configure multi-line comments to comment/uncomment selected text? For example C/C++'s preprocessor could be toggled like this. eg: Before: // a comment Some(code); /* ...
1 vote
1 answer
119 views

C offset is 2 with treesit

I recently started using treesit and I'm noticing with C files, my auto-indent is 2 spaces. How can I fix this to make it 4 spaces again? I've tried c-basic-offset.
7 votes
2 answers
591 views

How to transpose two arguments of a function call for C family languages?

How to swap two arguments for C function calls? eg: my_function(foo, bar, baz); ~~~~~~~~~~~~~^ (cursor location) Should be transposed to the right to make: my_function(bar, foo, baz); The simple ...
3 votes
2 answers
2k views

C/C++ with tree sitter: how to change indent?

I use Emacs with tree sitter for c++ code (c++-ts-mode). With usual c++-mode I've used this fix for me: (c-set-offset 'inline-open '0) but I don't understand how to do it in new c++-ts-mode. In ...
0 votes
1 answer
154 views

Emacs not opening existing file, only opens new file

I recently started coding in C (college class) and use Emacs as my primary text editor. In my class, we use the terminal to create new files and open existing ones, and I decided I wanted to be able ...
5 votes
3 answers
4k views

Syntax highlight doxygen comments in C/C++? (c-doc-comment-style)

Is it possible to syntax highlight doxygen in C/C++ code? QtCreator and Vim both support basic highlighting so \param, \note... etc are highlighted differently.
0 votes
0 answers
78 views

How to configure Emacs to support indented C preprocessor statements?

In some cases I deal with code that has heavily indented C preprocessor statements and want to setup Emacs to work with it without changing that indentation and follow the same indentation when having ...
0 votes
0 answers
31 views

Make ff-find-other-file ignore include directive in C

I have a binding setup as described here, the problem is every time the cursor is on #include "file" it always tries to jump on this include. I want that no matter where there cursor is I ...
0 votes
0 answers
162 views

When using company and lsp, why does the placeholder text sometimes not get replaced?

In a buffer in c-mode with the following content (with point after retu), pressing enter completes to return expression;. int main(int argc, char** argv) { retu } Point is now at the beginning of ...
0 votes
0 answers
165 views

Rewriting paths for bazel

The Bazel build tool has some features that interact poorly with emacs. When you build a C/C++ project for sandboxing purposes it makes a crazy hierarchy of symlinks, and uses them when invoking GCC. ...
0 votes
0 answers
28 views

Emacs displays letters and spaces as newlines until a non-letter/space char is entered

I am editing a C file, and it suddenly starts moving to a new line instead of showing the character I typed. This seems to be for letters and space. However, it has saved the characters, and if I type ...
0 votes
1 answer
175 views

Emacs displays different formatting than what actually is

I have been using emacs for a while now, I am relatively new to it but while editing i noticed that sometimes emacs will show the code correctly formatted, when i open it with another text editor ...
7 votes
3 answers
7k views

Better syntax-higlighting for member variables and function calls in cpp-mode

In atom, C++ files are well colored unlike emacs cpp-mode. Emacs does not highlight references to member variables, function calls or member functions. They all are uncolored. The left is from emacs ...
1 vote
0 answers
25 views

Customized c-mode indentation style in Emacs 27.2

I would like to produce c code in the following format: char *ft_strdup(const char *s1) { char *h; size_t len; ... } Where I can tab after the type of the function signature and ...
0 votes
0 answers
14 views

Strange flush left C-code formatting in Emacs 24.3 of SLES 12 SP5

I see some odd Emacs behavior in C-mode recently. I suspect that the change happened either when switching from SLES 12 SP4 to SLES12 SP5 (both have Emacs 24.3), or when switching from SLES 11 SP4 (...
3 votes
1 answer
215 views

How to get the following indentation style in c?

I would like to have the following behavior: int main(){ to result in: int main(){ | } Where pipe is the cursor, and I DON'T have to press RETURN key after '{'. I have already achieved the ...
3 votes
2 answers
2k views

Gray-out preprocessor conditionals

Is there a package that will gray out or hide the false portion of a c preprocessor macro? #define ENABLE 1 #if ENABLE bool hide = false; #else bool hide = true; #endif In the above example, ...
1 vote
1 answer
368 views

How do I populate tags for C?

I hover over stdlib: #include <stdlib.h> I type M-. and it asks me: Visit tags table (default TAGS): I don't have one of those. I see a lot of information about TAGS in the emacs ...
0 votes
2 answers
1k views

How to use C header files in org-mode source code blocks?

I have a C code block in my org-mode document like the following: #+begin_src C :exports both #include "my_header.h" int main(void) { function_from_my_header(); return 0; } #+...
2 votes
1 answer
268 views

Emacs not indenting enum / enum class contents

I've got a small problem to do with Doom Emacs / Emacs. Enum contents are not indented at all... Here's what I would like: enum class RandomEnum { A, B, C, D }; Here's what I get: ...
1 vote
1 answer
89 views

How to pass the current scopes function symbol as an argument to an elisp function

I am trying to create an org-capture template which works with yankpad and yasnippets to such that if I am working with some c code like this: example.c static int somefunc(int a) { if (a ==5) { ...
0 votes
0 answers
284 views

noweb doesn't expand at all

I have a feeling this must be a stupid simple problem however I just can't seem to figure out what I'm doing wrong. I'm using Doom emacs and trying to use noweb with org mode source code blocks to ...
0 votes
1 answer
2k views

auto-complete-c-headers just works with C. No result with C++

I installed the auto-complete-c-headers package and added the following in my Emacs configuration file ; start auto-complete with emacs (require 'auto-complete) ; do default config for auto-complete (...
1 vote
2 answers
168 views

How to NOT Auto Indent when a specific Character is inputted?

So I recently encountered a problem programming in C that whenever I enter the left parenthesis character, (, Emacs auto-idents the code. [4 spaces here]DATA *SeqQueueOut( I know that there is this ...
3 votes
1 answer
137 views

Centering within comment blocks or ASCII art

I have C comments like this: /****************************************************************************** * Includes * ***********...
3 votes
1 answer
753 views

How to us a shortcut to add semicolon to end of current line?

Is there a shortcut to add a semicolon to the end of the current line of code? For instance, M-; inserts a comment at the end of the current line of code. Is there anything like that for a semicolon? ...
1 vote
1 answer
39 views

How to see brief location in the code in C/C++ mode

While editing a long C++ file, I use rtags to jump around. It would be very handy for me to know where I am in terms of where the cursor is relative to the classes-functions. For example, it would be ...
0 votes
0 answers
55 views

Use iconv directly on the selected region to convert codes

I copied and pasted the C code as: int main(void) {    statements    return 0; } to org's babel code block, when strike C-c C-c, it report error: /tmp/babel-uaYVXU/C-src-Pd1SZs.c:11:6: error: stray ‘...
1 vote
1 answer
91 views

c-set-style: Error loading guessed style

My company has very specific indentation rules for C code. I want to create a style from those rules, and have it load at startup. Doing a C/Guess Style From This Buffer and C/Install Last Guessed ...
0 votes
0 answers
194 views

Where is M-x compile?

I have a basic C file open in c-mode: #include <stdio.h> #include <stdlib.h> int main() { return 0; }; I'm trying to compile it. I type M-x compile expecting to be asked to set my ...
1 vote
0 answers
53 views

ETAGS with dependencies

I'm trying to use emacs for C development. From here, I understand that in order to see the definitions of functions, I need to use something called etags. My code is: #include <stdlib.h> #...
1 vote
1 answer
467 views

How can I lint a C file?

I have the following: int main() { int a = 1; int b = 2; return 0; }; I am expecting some lint to align the indentation. My file is open with (C/*l AC Abbrev). I try C-c . which asks me:...
1 vote
1 answer
280 views

Customize org babel execution command in C

I have the following C code: #include <stdio.h> #include <math.h> int main(){ printf("Square = %d", pow(4,2)); return 0; } Now if I run this in the shell. I would first compile ...
1 vote
0 answers
29 views

fork in org-mode babel source block executes incorrectly

I have this small piece of code on emacs org-mode : #+BEGIN_SRC C :eval #+BEGIN_SRC C :fork-example1.c :noweb no-export :eval :flags -Wall -Werror -pedantic //Fork-exemplec-cours.c #include <stdio....
7 votes
4 answers
765 views

How do I disable ffap (find file at point) when the first two non-space characters in a line are '//'?

In Verilog/C/C++, comments can begin with //. Here's an example comment, //This is a comment I like to use the find-file-at-point feature. If my cursor is on the file name in `include "some_file.v"....
1 vote
1 answer
2k views

Flycheck does not find .h file

I am using Flycheck for my syntax highlighting which have been working out great when working with all header and source files in one directory. I recently decided to add some unit tests to test my ...
0 votes
0 answers
75 views

Stepping through c code in emacs

I am trying to step through code in emacs and am looking for a plugin which will displa the contents of an element when I hover over it. Is there any plugin like this currently? How do you step ...
1 vote
0 answers
400 views

How do you guys use doxygen? [closed]

I'm curious about Doxygen, how do you guys manage documentation in C/C++ projects on emacs? I didn't find a good package that does it consistently. So far I did use gendoxy and doxymacs. I had ...
1 vote
2 answers
424 views

cscope-minor-mode not enabled for C in emacs 25

I'm using Emacs 25 on Ubuntu 16.04, after a while spent on Emacs 24. One thing that I've noticed changed in version 25 is, cscope minor mode is not enabled by default when I edit C files, while it was ...
0 votes
0 answers
22 views

some pointer declarations not colored

macs -nw fails to color code certain declarations of pointer arrays seemingly depending on the structure being pointed to. For example: SomeStruct *one[4] is all white (I have dark background), but ...
1 vote
0 answers
56 views

Is there a package that show the value of constant variables? C/C++

I would like some package that show the variable value when I put cursor on it. The behavior that I expect can be seen in the image below. The image below is in vscode, I would like some package that ...
4 votes
1 answer
339 views

Custom indentation for macros in C mode

I'm working in a codebase with an extensive use of function macros and I'm having some difficulty finding the correct way to set indentations with them. Specifically, we pass a lot of statement lists {...
1 vote
1 answer
48 views

Adding rule to indentation

A code base I work on has the macro #define when break; case to make switch statements 'cleaner' However this causes problems with indentation, Is it possible to set the behavior of 'when' to be ...
3 votes
0 answers
422 views

Valgrind interface for emacs

Is there an interface similar to 'gdb-mi' for using Valgrind in emacs? What are some ways to use Valgrind inside emacs?
1 vote
0 answers
122 views

Doxygen style for c-doc-comment-style? [duplicate]

The option c-doc-comment-style supports javadoc, autodoc and gtkdoc. Is there a way to get doxygen support? (\returns, \note, \brief... etc)