34 lines
1.5 KiB
Diff
34 lines
1.5 KiB
Diff
From 1c95f5a34c14f08d65cdd198827e3a2fcb63cf39 Mon Sep 17 00:00:00 2001
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From: Tom Tromey <tom@tromey.com>
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Date: Tue, 22 Jan 2019 11:13:53 -0700
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Subject: [PATCH] Fix issue 57762
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Issue 57762 points out a compiler crash when the compiler was built
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using a stock LLVM 7. LLVM 7 was released without a necessary fix for
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a bug in the DWARF discriminant code.
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This patch changes rustc to use the fallback mode on (non-Rust) LLVM 7.
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Closes #57762
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---
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src/librustc_codegen_llvm/debuginfo/metadata.rs | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/src/librustc_codegen_llvm/debuginfo/metadata.rs b/src/librustc_codegen_llvm/debuginfo/metadata.rs
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index 6deedd0b5ea3..a354eef6887a 100644
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--- a/src/librustc_codegen_llvm/debuginfo/metadata.rs
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+++ b/src/librustc_codegen_llvm/debuginfo/metadata.rs
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@@ -1164,7 +1164,11 @@ fn use_enum_fallback(cx: &CodegenCx) -> bool {
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// On MSVC we have to use the fallback mode, because LLVM doesn't
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// lower variant parts to PDB.
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return cx.sess().target.target.options.is_like_msvc
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- || llvm_util::get_major_version() < 7;
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+ || llvm_util::get_major_version() < 7
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+ // LLVM version 7 did not release with an important bug fix;
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+ // but the required patch is in the equivalent Rust LLVM.
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+ // See https://github.com/rust-lang/rust/issues/57762.
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+ || (llvm_util::get_major_version() == 7 && unsafe { !llvm::LLVMRustIsRustLLVM() });
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}
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// Describes the members of an enum value: An enum is described as a union of
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