From 3747df71fa280557f85d847dcb460c0cbe0d16ce Mon Sep 17 00:00:00 2001 From: Mark Rousskov Date: Thu, 12 Nov 2020 09:49:45 -0500 Subject: [PATCH] Avoid installing external LLVM dylibs If the LLVM was externally provided, then we don't currently copy artifacts into the sysroot. This is not necessarily the right choice (in particular, it will require the LLVM dylib to be in the linker's load path at runtime), but the common use case for external LLVMs is distribution provided LLVMs, and in that case they're usually in the standard search path (e.g., /usr/lib) and copying them here is going to cause problems as we may end up with the wrong files and isn't what distributions want. This behavior may be revisited in the future though. --- src/bootstrap/dist.rs | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs index bdab12db43502..9506a8294082d 100644 --- a/src/bootstrap/dist.rs +++ b/src/bootstrap/dist.rs @@ -2335,6 +2335,22 @@ fn maybe_install_llvm(builder: &Builder<'_>, target: TargetSelection, dst_libdir return; } + if let Some(config) = builder.config.target_config.get(&target) { + if config.llvm_config.is_some() { + // If the LLVM was externally provided, then we don't currently copy + // artifacts into the sysroot. This is not necessarily the right + // choice (in particular, it will require the LLVM dylib to be in + // the linker's load path at runtime), but the common use case for + // external LLVMs is distribution provided LLVMs, and in that case + // they're usually in the standard search path (e.g., /usr/lib) and + // copying them here is going to cause problems as we may end up + // with the wrong files and isn't what distributions want. + // + // This behavior may be revisited in the future though. + return; + } + } + // On macOS, rustc (and LLVM tools) link to an unversioned libLLVM.dylib // instead of libLLVM-11-rust-....dylib, as on linux. It's not entirely // clear why this is the case, though. llvm-config will emit the versioned