Speed up compiling of AUR packages in arch linux

aur_speed_up.md

Edit /etc/makepkg.conf

replace in CFLAGS and CXXFLAGS to use the native one

-march=x86-64 -mtune=generic to -march=native

speed up build by set multiple threads

MAKEFLAGS="-j$(nproc)"

### speedup package compression for XZ 1. use less aggressive compression. -0 is the faster, I prefer -2 (default is -6) 2. use all available thread -T0 (or -T8 for 8 threads)

COMPRESSXZ=(xz -c -z -) to COMPRESSXZ=(xz -c -z -2 -T0 -)

As the default package extension became zst PKGEXT='.pkg.tar.zst', the compression isn't hurt badly anymore, but it can be speed up by add the desired level to COMPRESSZST, like add -1:

COMPRESSZST=(zstd -1 -c -z -q -)

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