[vlc-devel] Re: Compiling with visual studio 2005

Rémi Denis-Courmont rem at videolan.org
Thu Dec 21 12:58:04 CET 2006


Le jeudi 21 décembre 2006 11:56, Mortisandraco a écrit :
> For example, in libvlc there are a couple of times you used something
> like: void foo(int i)
> {
>  char array[i];
> ...
> I need to look it up but I don't think that's possible in the c
> standard.

It looks like a perfectly standard variable-length array.

From ISO/IEC 9899:TC2 § Array declarators, constraints:
"1 (...) the [ and ] may delimit an expression (...). If they delimit an 
expression, the expression shall have an integer type. If the 
expression is a constant expression, it shall have a value greater than 
zero. (...)
 4 (...) If the size is an integer constant expresssion and the element 
type has a known constant size, the array type is not a variable-length 
array type; otherwise the array type is a variable-length array type.

> Currently I'm at the download limit of my provider so I 
> can't download cygwin to check with gcc (--pedantic IIRC).

I don't know if -pedantic will work. I know from experience that 
switching from -std=gnu99 to -std=c99 removes all the non-ISO APIs, 
which understandably does not work with VLC. It's a pity considering we 
do not necessarily want to include non-standard GNU constructs. On the 
other hand, I think we use some non-standard "__attribute__" when 
compiling under GCC, and I don't know what happens if using -pedantic 
or -std=c** either.

> I changed the code to char* array = malloc(i * sizeof(char));

By the way, note that sizeof(char) == 1 per definition.

Best regards,

Rémi Denis-Courmont
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