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

[Javier Jimenez Shaw]

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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