[Bug middle-end/88059] Spurious stringop-overflow warning with strlen, malloc and strncpy

[molli.bender at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88059

Moritz Bender <molli.bender at gmail dot com> changed:

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                 CC|                            |molli.bender at gmail dot com

--- Comment #2 from Moritz Bender <molli.bender at gmail dot com> ---
I don't know whether this comment will ever be read, but I'd like to add that I
have the same problem with strncpy incorrectly getting the "warning: 'strncpy'
specified bound depends on the length of the source argument". I do believe
that this warning is wrong in the case that the destination buffer is also
dependant on the strlen of the source string.

Assume the following code:


    char my_string[strlen(argv[1] - 1)];
    strncpy(my_string, argv[1], strlen(argv[1]) - 5);
    memcpy(&my_string[strlen(argv[1]) - 5], ".7z", 4);
    printf("my string: %s\n", my_string);

This code will generate the mentioned warning, although I don't think it
should. I HAVE to use strlen to achieve what I want to; this is a relatively
common use case. I know I can use memcpy instead of the strncpy, but regarding
that her I'm just dealing with strings I'd rather use strncpy.