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Rollup merge of rust-lang#100621 - taiki-e:armv4t-atomics-32, r=cuviper
Pass +atomics-32 feature for {arm,thumb}v4t-none-eabi Similar to rust-lang@89582e8, but for ARMv4t. Pre-v6 ARM target does not have atomic CAS, except for Linux and Android where atomic CAS is provided by compiler-builtins. So, there is a similar issue as thumbv6m. I have confirmed that enabling the `atomics-32` target feature fixes the problem in the project affected by this issue. (taiki-e/portable-atomic#28 (comment)) Closes rust-lang#100619 r? `@nikic` cc `@Lokathor`
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