[asterisk-bugs] [JIRA] (ASTERISK-29306) Incorrect use of __attribute__((pure)) in ast_str_to_lower definition

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-29306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=253935#comment-253935 ] 

Asterisk Team commented on ASTERISK-29306:
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> Incorrect use of __attribute__((pure)) in ast_str_to_lower definition
> ---------------------------------------------------------------------
>
>                 Key: ASTERISK-29306
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29306
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/General
>    Affects Versions: 16.16.1, 18.2.0
>         Environment: debian 10,
>            Reporter: Vitezslav Novy
>
> I am analysing  problem with case-insensivity of application names in cel.conf declared here
> https://github.com/asterisk/asterisk/blob/18/main/cel.c#L75
> In our configuration application CEL events are recorded only when applications are listed in cel.conf with uppercase first letter.
> Looking to code in cel.c application  names read from configuration shoud be converted to lowercase in function apps_handler and in function   cel_track_app app name is also converted to lowercase before it is searched in app list
> But it does not happen. Using few extra  logging lines I can see app name before and after calling ast_str_to_lower has first letter uppercase and ast_str_to_lower just does not work.
> Looking to dissasembled binary I can see the function was completely optimized out. I believe it is because of it is declared with attrribute_pure 
> which declares no side effects. But it is not true for the function ast_str_to_lower, there are side effects. 
> In combination with fact that function always returns value its parameter
> compiler is right if skips it completely and only uses the parameter of the function as its result.



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