Allow cross-compiling outside of build.rs
#242
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Do not expect CARGO_CFG_TARGET_OS/CARGO_CFG_TARGET_ARCH to always be available, and instead try to determine this information based on the rustc target tuple.
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Reliance on
CARGO_CFG_TARGET_OS/CARGO_CFG_TARGET_ARCHwas introduced in #158, but these are not available when outsidebuild.rsscripts. Instead, we should try to determineCMAKE_SYSTEM_NAMEandCMAKE_SYSTEM_PROCESSORbased on the target triple.In
cc-rs, we do this by parsing the target triple, though I suspect that to be overkill forcmake-rs' purposes, so I've tried to keep it simpler.It's doable for
CMAKE_SYSTEM_NAMEbut kinda difficult forCMAKE_SYSTEM_PROCESSOR, because the values expected that aren't really documented, so it's hard to know if we emit it correctly? In any case, I've written it in a way that the user can overrideCMAKE_SYSTEM_PROCESSORif necessary.Fixes #228.
bootstrapcurrently has to work around this in rust-lang/rust#138784.