New comment by Sturmflut on void-packages repository

https://github.com/void-linux/void-packages/issues/21105#issuecomment-755413178

Comment:
I just ran into the same problem when building for Fujitsu A64FX with GCC 9.2.1 on CentOS 8.2. This is the full compiler all:

`/opt/rh/gcc-toolset-9/root/usr/bin/cc -DDT_HAVE_SIGNAL_TRACE -DGDK_DISABLE_DEPRECATED -DGDK_VERSION_MIN_REQUIRED=GDK_VERSION_3_22 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_MIN_REQUIRED -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40 -DGTK_DISABLE_DEPRECATED -DGTK_DISABLE_SINGLE_INCLUDES -DHAVE_CONFIG_H -DHAVE_GAME -DHAVE_ICU -DHAVE_KWALLET -DHAVE_LENSFUN -DHAVE_OPENCL -DHAVE_SQLITE_324_OR_NEWER -DSQLITE_CORE -DSQLITE_ENABLE_ICU -D_XOPEN_SOURCE=700 -D__GDK_KEYSYMS_COMPAT_H__ -Dlib_darktable_EXPORTS -I/home/scc/mr2515/darktable/build/bin -I/home/scc/mr2515/darktable/src -isystem /home/scc/mr2515/darktable/src/external -isystem /home/scc/mr2515/darktable/src/external/OpenCL -I/home/scc/mr2515/darktable/build/lib64/darktable/rawspeed/src -isystem /home/scc/mr2515/darktable/src/external/rawspeed/src/external -I/home/scc/mr2515/darktable/src/external/rawspeed/src/librawspeed -I/home/scc/mr2515/darktable/src/external/whereami/src -isystem /usr/include/glib-2.0 -isystem /usr/lib64/glib-2.0/include -isystem /usr/include/gtk-3.0 -isystem /usr/include/pango-1.0 -isystem /usr/include/fribidi -isystem /usr/include/cairo -isystem /usr/include/pixman-1 -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/uuid -isystem /usr/include/harfbuzz -isystem /usr/include/gdk-pixbuf-2.0 -isystem /usr/include/gio-unix-2.0 -isystem /usr/include/atk-1.0 -isystem /usr/include/at-spi2-atk/2.0 -isystem /usr/include/at-spi-2.0 -isystem /usr/include/dbus-1.0 -isystem /usr/lib64/dbus-1.0/include -isystem /usr/include/libxml2 -isystem /home/scc/mr2515/local/include -isystem /usr/include/librsvg-2.0 -isystem /usr/include/json-glib-1.0  -Wall -Wformat -Wformat-security -Wshadow -Wtype-limits -Wvla -Wold-style-declaration -Wno-unknown-pragmas -Wno-error=varargs -Wno-format-truncation -Wno-error=address-of-packed-member -std=c99 -fopenmp -march=native  -g -O2 -g -DNDEBUG -O2 -fPIC   -Werror -Wfatal-errors -o CMakeFiles/lib_darktable.dir/common/bilateral.c.o   -c /home/scc/mr2515/darktable/src/common/bilateral.c`

Looks like an actual compiler limitation on ARMv8A. The other compilers on the system are Cray 10 and Clang 10, but both don't pass the "supported platform" test in the CMakeFile.

I'll try to build GCC 10.