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The metadata is exposed as an explicit Kbuild target instead of relying on an untracked side effect of the object build. This lets dependent modules ask for the metadata directly, including single-target builds where `nova-core`'s object may already be up to date. This is a workaround until the build system supports Rust cross-crate dependencies natively. Signed-off-by: Alexandre Courbot --- drivers/gpu/nova-core/Makefile | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/gpu/nova-core/Makefile b/drivers/gpu/nova-core/Makefile index 59ac25488896..b8ccea78b2d2 100644 --- a/drivers/gpu/nova-core/Makefile +++ b/drivers/gpu/nova-core/Makefile @@ -24,3 +24,27 @@ $(obj)/exports_nova_core_generated.h: $(obj)/nova_core.o FORCE targets += exports_nova_core_generated.h $(obj)/nova_core_exports.o: $(obj)/exports_nova_core_generated.h + +# Dependent Rust drivers need `nova-core`'s crate metadata. +# Expose it as an explicit target so they can request it directly. +nova_core_rmeta := libnova_core.rmeta +nova_core_rmeta_private := .nova_core_rmeta/$(nova_core_rmeta) +targets += $(nova_core_rmeta) $(nova_core_rmeta_private) + +# Build in a private directory to avoid racing with `nova_core.o` on rustc's +# intermediate object names during parallel builds. +quiet_cmd_rustc_rmeta_rs = RUSTC RMETA $@ + cmd_rustc_rmeta_rs = mkdir -p $(dir $@); \ + $(rust_common_cmd) --emit=metadata=$@ \ + --emit=obj=$(basename $@).o $<; \ + rm -f $(basename $@).o + +$(obj)/$(nova_core_rmeta_private): private __modname := nova-core +$(obj)/$(nova_core_rmeta_private): private part-of-builtin := $(if $(filter y,$(CONFIG_NOVA_CORE)),y) +$(obj)/$(nova_core_rmeta_private): private part-of-module := $(if $(filter m,$(CONFIG_NOVA_CORE)),y) +$(obj)/$(nova_core_rmeta_private): $(obj)/nova_core.rs FORCE + +$(call if_changed_dep,rustc_rmeta_rs) + +# Keep the metadata available at a stable path for consumers. +$(obj)/$(nova_core_rmeta): $(obj)/$(nova_core_rmeta_private) FORCE + $(call if_changed,copy) -- 2.54.0