sysroot specification

classes/internal-rust-cross.bbclass

@@ -7,14 +7,15 @@ DEPENDS += "virtual/${TARGET_PREFIX}gcc rust-native"
 PROVIDES = "virtual/${TARGET_PREFIX}rust"
 PN = "rust-cross-${TARGET_ARCH}"
 
+# The same value as ${TOOLCHAIN_OPTIONS}. We can't use that variable directly
+# here because cross.bblcass is "helpful" and blanks it out.
+PRE_LINK_ARGS_PREPEND = "--sysroot=${STAGING_DIR_TARGET}"
+
 ## gcc-cross settings
 # INHIBIT_DEFAULT_DEPS = "1"
 # INHIBIT_PACKAGE_STRIP = "1"
 # ARCH_FLAGS_FOR_TARGET += "-isystem${STAGING_DIR_NATIVE}${target_includedir}"
 
-# TODO: use rust-native instead of a snapshot
-EXTRA_OECONF += ""
-
 # cross.bbclass is "helpful" and overrides our do_install. Tell it not to.
 do_install () {
 	rust_do_install

classes/rust.bbclass

@@ -59,7 +59,9 @@ RUST_TARGET_SYS = "${@rust_base_triple(d, 'TARGET')}"
 
 
 # FIXME: the 'rustlib' element of this is to workaround rustc forgetting the libdir it was built with.
-RUST_PATH_NATIVE="${STAGING_LIBDIR_NATIVE}:${STAGING_BASE_LIBDIR_NATIVE}:${STAGING_LIBDIR_NATIVE}/${TARGET_SYS}/rustlib/${TARGET_SYS}/lib"
+RUST_PATH_NATIVE="${STAGING_LIBDIR_NATIVE}:\
+${STAGING_BASE_LIBDIR_NATIVE}:\
+${STAGING_LIBDIR_NATIVE}/${TARGET_SYS}/rustlib/${TARGET_SYS}/lib"
 
 # FIXME: set based on whether we are native vs cross vs buildsdk, etc
 export RUST_PATH ??= "${RUST_PATH_NATIVE}"
@@ -107,7 +109,7 @@ oe_runcargo_build () {
 	# FIXME: if there is already an entry for this target, in an existing
 	# cargo/config, this won't work.
 	which cargo
-	which rust
+	which rustc
 	bbnote ${CARGO} build --target ${TARGET_SYS} "$@"
 	oe_cargo_config
 	"${CARGO}" build -v --target "${TARGET_SYS}" --release "$@"

recipes/rust/rust.inc

@@ -113,6 +113,7 @@ def rust_gen_target(d, thing, wd):
     features = d.getVarFlag('FEATURES', arch, True) or ""
 
     pre_link_args = (d.getVarFlag('PRE_LINK_ARGS', arch, True) or "").split()
+    pre_link_args.extend((d.getVar('PRE_LINK_ARGS_PREPEND', True) or "").split())
 
     o.write('''{{
          "data-layout": "{}",