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comp / comp.lang.tcl / Changed Behaviour on Tcl_Alloc in tcl9, howto port ?

SubjectAuthor
* Changed Behaviour on Tcl_Alloc in tcl9, howto port ?Michael Niehren
`- Re: Changed Behaviour on Tcl_Alloc in tcl9, howto port ?Rich

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Subject: Changed Behaviour on Tcl_Alloc in tcl9, howto port ?
From: Michael Niehren
Newsgroups: comp.lang.tcl
Organization: www.abavia.com
Date: Fri, 4 Oct 2024 08:54 UTC
From: michael@niehren.de (Michael Niehren)
Subject: Changed Behaviour on Tcl_Alloc in tcl9, howto port ?
Newsgroups: comp.lang.tcl
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Date: Fri, 04 Oct 2024 10:54:38 +0200
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Hi,

i am trying to port an C-Module to tcl9. In the module there has been used a
call to Tcl_Alloc to allocate memory for an char* variable dest_buf.
dest_buf = Tcl_Alloc(dest_size);

Now on tcl9 Tcl_Alloc has an return type of void, on tcl8 it has char*, so i
got the error: error: invalid conversion from ‘void*’ to ‘char*’

I did not find something about that in the migration guide.

Any ideas for resovling this issue ?

best regards
Michael

Subject: Re: Changed Behaviour on Tcl_Alloc in tcl9, howto port ?
From: Rich
Newsgroups: comp.lang.tcl
Organization: A noiseless patient Spider
Date: Fri, 4 Oct 2024 12:33 UTC
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From: rich@example.invalid (Rich)
Newsgroups: comp.lang.tcl
Subject: Re: Changed Behaviour on Tcl_Alloc in tcl9, howto port ?
Date: Fri, 4 Oct 2024 12:33:35 -0000 (UTC)
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Michael Niehren <michael@niehren.de> wrote:
> Hi,
>
> i am trying to port an C-Module to tcl9. In the module there has been used a
> call to Tcl_Alloc to allocate memory for an char* variable dest_buf.
> dest_buf = Tcl_Alloc(dest_size);
>
> Now on tcl9 Tcl_Alloc has an return type of void, on tcl8 it has char*, so i
> got the error: error: invalid conversion from ‘void*’ to ‘char*’
>
> I did not find something about that in the migration guide.
>
> Any ideas for resovling this issue ?

Possibly casting the void pointer to char*?:

dest_buf = (char*)Tcl_Alloc(dest_size);

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