[gdal-dev] Problems compiling GDAL in ARM + NEON + libpng

[Even Rouault]

Was fixed in 
https://github.com/OSGeo/gdal/commit/1c719a864232daf58b799fbb2da785f3f9b2d579

Le 10/12/2021 à 12:29, Javier Jimenez Shaw a écrit :
> Hi
>
> I am trying to compile GDAL 3.3.2 for ARM (apple M1), and I have 
> problems with the included libpng. There is a missing "arm" folder in 
> libpng. Is that intentional? How can I build it?
>
> NEON support is detected, so libpng try to use NEON optimized 
> functions, but the implementation of those is missing, so I get
>
> Undefined symbols for architecture arm64:
>   "_png_do_expand_palette_rgb8_neon", referenced from:
>       _png_do_read_transformations in pngrtran.o
>   "_png_do_expand_palette_rgba8_neon", referenced from:
>       _png_do_read_transformations in pngrtran.o
>   "_png_init_filter_functions_neon", referenced from:
>       _png_read_filter_row in pngrutil.o
>   "_png_riffle_palette_neon", referenced from:
>       _png_do_read_transformations in pngrtran.o
>
> Thanks
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