chore: simplify rust activation (#2828)

pixi.toml

@@ -108,15 +108,18 @@ git = ">=2.46.0,<3"
 openssl = "3.*"
 pkg-config = "0.29.*"
 rust = "~=1.81.0"
+
 [feature.build.target.linux-64.dependencies]
 clang = ">=18.1.8,<19.0"
 compilers = ">=1.6.0"
 make = ">=4.3,<5"
 mold = ">=2.33.0,<3.0"
+
+[feature.build.activation]
+env.CARGO_TARGET_DIR = "target/pixi"
+
 [feature.build.target.unix.activation]
 scripts = ["scripts/activate.sh"]
-[feature.build.target.win-64.activation]
-scripts = ["scripts/activate.bat"]
 
 [feature.docs.dependencies]
 cairosvg = "2.7.1.*"

scripts/activate.sh

@@ -1,10 +1,13 @@
 #!/bin/bash
 set -Eeuo pipefail
-export CARGO_TARGET_DIR="target/pixi"
 
+# Setup the mold linker when targeting x86_64-unknown-linux-gnu
 export CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER="clang"
 export CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUSTFLAGS="-C link-arg=-fuse-ld=$CONDA_PREFIX/bin/mold"
 
-# on macOS we need to set these rust flags
+# On macOS we need to set these rust flags to avoid the following error:
+# dyld[98511]: Library not loaded: @rpath/liblzma.5.dylib
+#   Referenced from: <E86679E3-7383-3039-9E4A-031C60A071A5> ..
+#   Reason: no LC_RPATH's found
 export CARGO_TARGET_X86_64_APPLE_DARWIN_RUSTFLAGS="-C link-arg=-Wl,-rpath,$CONDA_PREFIX/lib"
 export CARGO_TARGET_AARCH64_APPLE_DARWIN_RUSTFLAGS="-C link-arg=-Wl,-rpath,$CONDA_PREFIX/lib"