Set llvm in rust for redox dynamically linked

recipes/archives/zstd/recipe.toml

@@ -8,6 +8,9 @@ template = "custom"
 script = """
 DYNAMIC_STATIC_INIT
 rsync -av --delete "${COOKBOOK_SOURCE}/" ./
+# TODO: fPIC is the default on linux but not on redox and
+#       required by llvm21 as zstd statically linked there
+export CPPFLAGS="$CPPFLAGS -fPIC"
 ${COOKBOOK_MAKE}
 ${COOKBOOK_MAKE} install DESTDIR="${COOKBOOK_STAGE}" prefix="/usr"
 """

recipes/dev/llvm21/recipe.toml

@@ -40,6 +40,7 @@ COOKBOOK_CMAKE_FLAGS+=(
     -DLLVM_TOOL_LLVM_PROFDATA_BUILD=On
     -DLLVM_TARGETS_TO_BUILD="$LLVM_TARGETS_TO_BUILD"
     -DLLVM_ENABLE_ZLIB=Off
+    -DLLVM_USE_STATIC_ZSTD=On
 
 # the rest of options that shared to clang
     -DCROSS_TOOLCHAIN_FLAGS_NATIVE="-DCMAKE_TOOLCHAIN_FILE=$(realpath "${COOKBOOK_RECIPE}/native.cmake")"
@@ -64,7 +65,6 @@ if [ "${COOKBOOK_HOST_SYSROOT}" = "/usr" ]; then
 # avoid linking as much as possible during bootstrapping
     COOKBOOK_CMAKE_FLAGS+=(
         -DLLVM_ENABLE_LIBXML2=Off
-        -DLLVM_USE_STATIC_ZSTD=On
     )
 fi
 

recipes/dev/rust/config-bootstrap.toml

@@ -1,7 +1,6 @@
 [llvm]
 download-ci-llvm = false
 static-libstdcpp = false
-# shared with lld
 link-shared = true
 
 [build]

recipes/dev/rust/config.toml

@@ -3,6 +3,7 @@ download-ci-llvm = false
 static-libstdcpp = false
 targets = "X86"
 experimental-targets = ""
+link-shared = true
 
 [build]
 host = ["x86_64-unknown-redox"]

recipes/dev/rust/recipe.toml

@@ -35,6 +35,8 @@ export CARGO_TARGET_X86_64_UNKNOWN_REDOX_RUSTFLAGS="\
 -Clink-args=-lz -Clink-args=-lzstd"
 # Hack for Rust errorneusly running `llvm-config --version` on cross compiled llvm-config
 cat "${COOKBOOK_ROOT}/bin/x86_64-unknown-redox-llvm-config" > "${COOKBOOK_SYSROOT}/bin/llvm-config"
+# Hack for Rust stage1 being dynamically linked with LLVM in prefix toolchain
+export LD_LIBRARY_PATH="${COOKBOOK_HOST_SYSROOT}/lib:${LD_LIBRARY_PATH}"
 # Linker flags for stage1 compiler (host -> host)
 export RUSTFLAGS_BOOTSTRAP="\
 -Clink-args=-L${COOKBOOK_HOST_SYSROOT}/lib \