Make MSVC detection ludicrously robust #31158
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Should fix a few more edge cases Signed-off-by: Peter Atashian <retep998@gmail.com>
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| "arm" => Some("x86_arm"), | ||
| _ => None, | ||
| fn bin_subdir(arch: &str) -> Vec<(&'static str, &'static str)> { | ||
| if let Some(host) = host_arch() { |
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Could you add some comments why this is necessary? It's not clear to me at least what the benefit is of not using cfg(target_arch)
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For example, if we're a 32-bit rustc on a 64-bit computer, we can take advantage of the amd64_x86 linker which has increased address space and performance so it can link very large projects with ease.
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Ah ok that sounds reasonable to me, yeah. Can you add some documentation to that effect?
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Closing due to inactivity, but feel free to resubmit with comments addressed! |
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VS 15 preview has come out so I intend to update this PR to support it. |
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Make MSVC detection ludicrously robust Resurrection of #31158 r? @alexcrichton
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Should fix a few more edge cases.
By using
Optionall the way down the rabbit hole this code can now fallback to older versions of MSVC if a newer version doesn't contain the necessary things.Also prefers the linker whose host matches the system's architecture instead of target_arch, but can also fallback from amd64 to x86 as the host.
cc #31151
r? @alexcrichton