rust: kbuild: support per-target environment variables

Certain vendored crates, like the upcoming `zerocopy`, use extra
environment variables (e.g. via `env!`).

Thus add support to easily specify those.

Acked-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/20260608141439.182634-7-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

diff --git a/rust/Makefile b/rust/Makefile
index df90fabefb703faf73f386894f4406d6732b0a4d..9b5a3f9dd934ec0d96acaee29382feac3619a794 100644 (file)
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -144,6 +144,7 @@ doctests_modifiers_workaround := $(rustdoc_modifiers_workaround)$(if $(call rust
 
 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
       cmd_rustdoc = \
+       $(rustc_target_envs) \
        OBJTREE=$(abspath $(objtree)) \
        $(RUSTDOC) $(filter-out $(skip_flags) --remap-path-scope=%,$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \
                $(rustc_target_flags) -L$(objtree)/$(obj) \
@@ -250,6 +251,7 @@ rustdoc-clean: FORCE
 
 quiet_cmd_rustc_test_library = $(RUSTC_OR_CLIPPY_QUIET) TL $<
       cmd_rustc_test_library = \
+       $(rustc_target_envs) \
        OBJTREE=$(abspath $(objtree)) \
        $(RUSTC_OR_CLIPPY) $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \
                @$(objtree)/include/generated/rustc_cfg \
@@ -314,6 +316,7 @@ rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi rusttestlib-pin_init FORCE
 
 quiet_cmd_rustdoc_test = RUSTDOC T $<
       cmd_rustdoc_test = \
+       $(rustc_target_envs) \
        RUST_MODFILE=test.rs \
        OBJTREE=$(abspath $(objtree)) \
        $(RUSTDOC) --test $(rust_common_flags) \
@@ -328,6 +331,7 @@ quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
       cmd_rustdoc_test_kernel = \
        rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
        mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
+       $(rustc_target_envs) \
        OBJTREE=$(abspath $(objtree)) \
        $(RUSTDOC) --test $(filter-out --remap-path-scope=%,$(rust_flags)) \
                -L$(objtree)/$(obj) --extern ffi --extern pin_init \
@@ -350,6 +354,7 @@ quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
 # so for the moment we skip `-Cpanic=abort`.
 quiet_cmd_rustc_test = $(RUSTC_OR_CLIPPY_QUIET) T  $<
       cmd_rustc_test = \
+       $(rustc_target_envs) \
        OBJTREE=$(abspath $(objtree)) \
        $(RUSTC_OR_CLIPPY) --test $(rust_common_flags) \
                @$(objtree)/include/generated/rustc_cfg \
@@ -519,6 +524,7 @@ $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
 
 quiet_cmd_rustc_procmacrolibrary = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) PL $@
       cmd_rustc_procmacrolibrary = \
+       $(rustc_target_envs) \
        $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
                $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \
                --emit=dep-info=$(depfile) --emit=link=$@ --crate-type rlib -O \
@@ -543,6 +549,7 @@ $(obj)/libsyn.rlib: $(src)/syn/lib.rs $(obj)/libquote.rlib FORCE
 
 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
       cmd_rustc_procmacro = \
+       $(rustc_target_envs) \
        $(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \
                -Clinker-flavor=gcc -Clinker=$(HOSTCC) \
                -Clink-args='$(call escsq,$(KBUILD_PROCMACROLDFLAGS))' \
@@ -567,6 +574,7 @@ $(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs \
 # since Rust 1.95.0 (https://github.com/rust-lang/rust/pull/151534).
 quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
       cmd_rustc_library = \
+       $(rustc_target_envs) \
        OBJTREE=$(abspath $(objtree)) \
        $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
                $(filter-out $(skip_flags),$(rust_flags)) $(rustc_target_flags) \