[mythtv] android compile problems

Peter Bennett pb.mythtv at gmail.com
Mon Jun 8 17:20:50 UTC 2020

On 6/8/20 12:42 PM, David Hampton wrote:
> On Mon, 2020-06-08 at 12:07 -0400, Peter Bennett wrote:
>> Hi David
>> Compiling fixes/31 for android 64 bit I am getting the following
>> errors
>> imagemetadata.cpp:281:19: error: no type named 'AutoPtr' in
>> 'Exiv2::Image'
>>       Exiv2::Image::AutoPtr m_image;
>>       ~~~~~~~~~~~~~~^
>> I see you added the following comment:
>> // Clang8 warns that 'AutoPtr' is deprecated. It was apparently
>> // deprecated in glibc-2.27, and the exiv2 library hasn't been
>> // updated yet.
>> Exiv2::Image::AutoPtr m_image;
>> Perhaps the exiv2 library has now been updated? Do you know more
>> about what is going on here?
> Hi Peter,
> The MythTV master branch was updated to use an embedded copy of exiv2
> git on March 15th (commit 2807de0a74) so that using a c++17 compiler
> would work.  C++17 dropped the AutoPtr type.   Android was also updated
> on Mar 23 (commit f3c1cd0408) to build exiv2 from git so that it could
> build using c++17 and master.
> What you're running into appears to be trying to compile fixes/31,
> which expects the old pre-c++17 exiv2-0.25 library, using the newer
> c++17 clean exiv2-git library.
>> The other error is
>> imagemetadata.cpp:704:10: error: cannot initialize return object of
>> type
>> 'ImageMetaData *' with an rvalue of type 'PictureMetaData *'
>> { return new PictureMetaData(filePath); }
>>            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Perhaps this needs to be changed to some sort of <cast> syntax. Old
>> style cast no longer working? Don't know why this errors for android
>> but not for linux.
> This is probably a side effect of the first problem.  The
> PictureMetaData object contains an Exiv2::Image::AutoPtr, which doesn't
> exist when compiling against the git version of exiv2.
> David
Thanks for the info.

Probably this happened because my makelibs was run under master but the 
mythbuild was run with fixes/31. So I maybe need to run makelibs again 
with v31 of the packaging repository, or at least the exiv2 part of 


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