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

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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