Re: [runtime/c] How to Set c_gnu in vim9script?

Ok, I had to put it in ~/.vimrc because ~/.vim/after/syntax/c.vim gets
sourced too late.

Thank you.

On Fri Nov 28, 2025 at 8:13 AM CET, Ben Yip wrote:
> g:c_gnu = 1
>
> On 2025-11-28, 'Björn Försterling' via vim_use wrote:
>>Hello,
>>
>>In a .c file in the following line, the character is categorized as
>>"cSpecialError".
>>```
>>char my_char = '\e';
>>```
>>(This is a valid character (27) on my machine.)
>>
>>It seems to be this section in runtime/syntax/c.vim:
>>```
>>83 if exists("c_gnu")
>>84 syn match cSpecialError "L\='\\[^'\"?\\abefnrtv]'"
>>85 syn match cSpecialCharacter "L\='\\['\"?\\abefnrtv]'"
>>86 else
>>87 syn match cSpecialError "L\='\\[^'\"?\\abfnrtv]'"
>>88 syn match cSpecialCharacter "L\='\\['\"?\\abfnrtv]'"
>>89 endif
>>```
>>
>>And "c_gnu" is not set.
>>
>>I tried setting "c_gnu" in "~/.vim/after/syntax/c.vim" (which is
>>currently vim9script).
>>
>>This would not work because the scope is local to the vim script:
>>```
>>var c_gnu = 1
>>```
>>
>>Can someone please help me how to set this variable?
>>And shouldn't the variable be set by default on GNU/Linux machines?
>>
>>Regards
>>Bjoern
>>
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