Yeah, apparently gcc 4.1 is older than any of the users appear to be currently
using, so when the symbol visibility was added, it probably broke compatibility
with gcc < 4.2.
Do you need it to work with both compilers? I'm sure it would not be very
difficult to modify export.h so that it doesn't include that attribute if the
compiler is too old, though of course you would end up with all symbols visible.
-- lg
On Apr 2, 2013, at 5:01 PM, Sheila Santos wrote:
> I'm using 2. On gcc version 4.1.2 20080704 (Red Hat 4.1.2-44) it fails.
> With gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) it seems OK.
>
> Sheila
>
> From: [email protected]
> [[email protected]] on behalf of Larry Gritz
> [[email protected]]
> Sent: Tuesday, April 02, 2013 4:53 PM
> To: OpenImageIO developers
> Subject: Re: [Oiio-dev] Exporting symbols on linux using __attribute___
> (visibility ("default"))) - enum problems
>
> What C++ compiler are you using?
>
>
> On Apr 2, 2013, at 4:51 PM, Sheila Santos wrote:
>
>> Hi everyone,
>>
>> I'm building openimageio on linux. In src/include/export.h, OIIO_API gets
>> set to to __attribute__ ((visibility ("default"))).
>>
>> It seems to work fine for functions and classes, but I get warnings and
>> errors when this is used with enums. For example:
>>
>> imagebufalgo.h:94: warning: type attributes are honored only at type
>> definition
>> imagebufalgo.h:94: error: use of enum ‘AlignedTransform’ without previous
>> declaration
>> imagebufalgo.h:95: error: expected unqualified-id before ‘{’ token
>>
>> code looks like:
>> enum OIIO_API AlignedTransform
>> {
>> TRANSFORM_NONE = 0,
>> TRANSFORM_FLIP, // Upside-down
>> TRANSFORM_FLOP, // Left/Right Mirrored
>> TRANSFORM_FLIPFLOP, // Upside-down + Mirrored (Same as 180 degree
>> rotation)
>> // TRANSFORM_ROT90, // Rotate 90 degrees clockwise. Image remains in
>> positive quadrant.
>> // TRANSFORM_ROT180, // Rotate 180 degrees clockwise. Image remains in
>> positive quadrant. (Same as FlipFlop)
>> // TRANSFORM_ROT270, // Rotate 270 degrees clockwise. Image remains in
>> positive quadrant.
>> };
>>
>> Is the syntax for ___attribute___ different for enums? Thanks.
>>
>> Sheila
>>
>>
>> _______________________________________________
>> Oiio-dev mailing list
>> [email protected]
>> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
>
> --
> Larry Gritz
> [email protected]
>
>
> _______________________________________________
> Oiio-dev mailing list
> [email protected]
> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
--
Larry Gritz
[email protected]
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