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Re: [Tinycc-devel] Modifying a char pointer initialized by character str

From: Daniel Glöckner
Subject: Re: [Tinycc-devel] Modifying a char pointer initialized by character string literal should cause an error.
Date: Fri, 27 Dec 2019 19:12:54 +0100
User-agent: Mutt/1.5.20 (2009-06-14)


On Fri, Dec 27, 2019 at 10:26:24PM +0800, 瞿兴 wrote:
> In section 6.7.8 of the C99 draft document defines :
> If an attempt is made to use pointer variable p to modify the contents of the 
> array, the behavior is undefined.
> When executing the testcase(in the attachment), tinyc does not report an 
> error and modify the value of the variable NISLParameter0 successfully

Well, "undefined behavior" allows tinycc to do this.

> The attachment includes the relevant testcase.

IMHO the only thing tinycc should do is to warn that a const char * has
been implicitly cast to char * in the initialization of NISLParameter0.
Putting string literals into read-only sections is a nice to have.

>     char *NISLParameter0 = "abcdefghij";

Best regards,


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