add arch flag to scons build command - #106
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scons arch=native lib # local scons arch=x86-64-v3 lib # portable AVX2 deploy scons lib # default: no -march (unchanged behaviour) or via $ export OBJCRYST_ARCH=x86-64-v3
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(same as diffpy/libobjcryst#33)
This allows specifying which
archto use for compilation.nativemight be optimal for a local build,x86-64-v3should be portable for non-ancient machines. Default is not to specify anything.It's either a scons command
scons arch=...or it's read fromOBJCRYST_ARCHenv variable, which has been handy for me if I build libobjcryst right before (which has the same PR).