I used the metallib.exe as follows:
C:\Program Files\Metal Developer Tools\metal\ios\bin>metallib.exe --version
AIR-LLD 32023.35 (metalfe-32023.35-windows) (compatible with legacy metallib linker)
C:\Program Files\Metal Developer Tools\metal\ios\bin>metallib.exe -o a.metallib a.air
C:\Program Files\Metal Developer Tools\metal\ios\bin>metallib.exe -o a.metallib a.air
0x00007FF73172DFD3 (0x00007FF731AFB230 0x000001CCAD1D09A0 0x0000000000000080 0x00007FF731664950)...
atyuwen
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Also notice that the indirect buffer B is created from a MTLHeap, so the automatic resource tracking is disabled, I have to sync manually using MTLFences.