Zig cc defaults to the equivalent of -march=native, but setting platform options like -maxv2 disables features that haven't been explicitly selected. The result is that you have to test for and enable both -maxv2 and -mpopcnt to get the avx2 code in htscodecs to build (and similarly for the other SIMD variants that it supports). Some minor quoting adjustments are also needed to make everything work correctly.
Also fixes up an incorrect comment describing usage in m4/hts_check_compile_flags_needed.m4
Zig cc defaults to the equivalent of -march=native, but setting platform options like -maxv2 disables features that haven't been explicitly selected. The result is that you have to test for and enable both -maxv2 and -mpopcnt to get the avx2 code in htscodecs to build (and similarly for the other SIMD variants that it supports). Some minor quoting adjustments are also needed to make everything work correctly.
Also fixes up an incorrect comment describing usage in m4/hts_check_compile_flags_needed.m4