rust.inc: Fix cross build llvm-config handling

We need llvm-config for the target but the cross compiled target binary is
no good. We can copy the native one into the target location where it will
then return the target values though.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 14 insertions, 4 deletions

diff --git a/meta/recipes-devtools/rust/rust.inc b/meta/recipes-devtools/rust/rust.inc
index 30f2b71fe8..47b76e725d 100644
--- a/meta/recipes-devtools/rust/rust.inc
+++ b/meta/recipes-devtools/rust/rust.inc
@@ -18,7 +18,8 @@ export RUST_TARGET_PATH="${WORKDIR}/targets/"
 export FORCE_CRATE_HASH="${BB_TASKHASH}"
 
 RUST_ALTERNATE_EXE_PATH ?= "${STAGING_LIBDIR}/llvm-rust/bin/llvm-config"
-export YOCTO_ALTERNATE_EXE_PATH = "${RUST_ALTERNATE_EXE_PATH}"
+RUST_ALTERNATE_EXE_PATH_NATIVE = "${STAGING_LIBDIR_NATIVE}/llvm-rust/bin/llvm-config"
+
 export YOCTO_ALTERNATE_MULTILIB_NAME = "/${BASELIB}"
 
 # We don't want to use bitbakes vendoring because the rust sources do their
@@ -82,8 +83,9 @@ python do_configure() {
     host_section = "target.{}".format(d.getVar('RUST_TARGET_SYS', True))
     config.add_section(host_section)
 
-    llvm_config = d.expand("${YOCTO_ALTERNATE_EXE_PATH}")
-    config.set(host_section, "llvm-config", e(llvm_config))
+    llvm_config_target = d.expand("${RUST_ALTERNATE_EXE_PATH}")
+    llvm_config_build = d.expand("${RUST_ALTERNATE_EXE_PATH_NATIVE}")
+    config.set(host_section, "llvm-config", e(llvm_config_target))
 
     config.set(host_section, "cxx", e(d.expand("${RUST_TARGET_CXX}")))
     config.set(host_section, "cc", e(d.expand("${RUST_TARGET_CC}")))
@@ -93,7 +95,7 @@ python do_configure() {
     build_section = "target.{}".format(d.getVar('SNAPSHOT_BUILD_SYS', True))
     config.add_section(build_section)
 
-    config.set(build_section, "llvm-config", e(llvm_config))
+    config.set(build_section, "llvm-config", e(llvm_config_build))
 
     config.set(build_section, "cxx", e(d.expand("${RUST_BUILD_CXX}")))
     config.set(build_section, "cc", e(d.expand("${RUST_BUILD_CC}")))
@@ -169,6 +171,14 @@ rust_runx () {
     unset CXXFLAGS
     unset CPPFLAGS
 
+    # Copy the natively built llvm-config into the target so we can run it. Horrible,
+    # but works!
+    if [ ${RUST_ALTERNATE_EXE_PATH_NATIVE} != ${RUST_ALTERNATE_EXE_PATH} ]; then
+        mkdir -p `dirname ${RUST_ALTERNATE_EXE_PATH}`
+        cp ${RUST_ALTERNATE_EXE_PATH_NATIVE} ${RUST_ALTERNATE_EXE_PATH}
+        chrpath -d ${RUST_ALTERNATE_EXE_PATH}
+    fi
+
     oe_cargo_fix_env
 
     python3 src/bootstrap/bootstrap.py ${@oe.utils.parallel_make_argument(d, '-j %d')} "$@" --verbose