Temporary implementation of rename #4
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jackpot51
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Apr 26, 2022
…rochenkov make memcmp return a value of c_int_width instead of i32 This is an attempt to fix rust-lang#32610 and rust-lang#78022, namely, that `memcmp` always returns an `i32` regardless of the platform. I'm running into some issues and was hoping I could get some help. Here's what I've been attempting so far: 1. Build the stage0 compiler with all the changes _expect_ for the changes in `library/core/src/slice/cmp.rs` and `compiler/rustc_codegen_llvm/src/context.rs`; this is because `target_c_int_width` isn't passed through and recognized as a valid config option yet. I'm building with `./x.py build --stage 0 library/core library/proc_macro compiler/rustc` 2. Next I add in the `#[cfg(c_int_width = ...)]` params to `cmp.rs` and `context.rs` and build the stage 1 compiler by running `./x.py build --keep-stage 0 --stage 1 library/core library/proc_macro compiler/rustc`. This step now runs successfully. 3. Lastly, I try to build the test program for AVR mentioned in rust-lang#78022 with `RUSTFLAGS="--emit llvm-ir" cargo build --release`, and look at the resulting llvm IR, which still shows: ``` ... %11 = call addrspace(1) i32 `@memcmp(i8*` nonnull %5, i8* nonnull %10, i16 5) #7, !dbg !1191 %.not = icmp eq i32 %11, 0, !dbg !1191 ... ; Function Attrs: nounwind optsize declare i32 `@memcmp(i8*,` i8*, i16) local_unnamed_addr addrspace(1) #4 ``` Any ideas what I'm missing here? Alternately, if this is totally the wrong approach I'm open to other suggestions. cc `@Rahix`
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