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kbuild: rust: add rustc-min-version support function

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Introduce `rustc-min-version` support function that mimics
`{gcc,clang}-min-version` ones, following commit 88b61e3bff93
("Makefile.compiler: replace cc-ifversion with compiler-specific macros").

In addition, use it in the first use case we have in the kernel (which
was done independently to minimize the changes needed for the fix).

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Fiona Behrens <me@Kloenk.dev>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Miguel Ojeda 2025-02-10 17:42:45 +01:00 committed by Masahiro Yamada
parent 144fced685
commit ac954145e1
3 changed files with 19 additions and 1 deletions
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14
Documentation/kbuild/makefiles.rst
View File

@ -667,6 +667,20 @@ cc-cross-prefix
endif
endif
$(RUSTC) support functions
--------------------------
rustc-min-version
rustc-min-version tests if the value of $(CONFIG_RUSTC_VERSION) is greater
than or equal to the provided value and evaluates to y if so.
Example::
rustflags-$(call rustc-min-version, 108500) := -Cfoo
In this example, rustflags-y will be assigned the value -Cfoo if
$(CONFIG_RUSTC_VERSION) is >= 1.85.0.
$(LD) support functions
-----------------------

2
arch/arm64/Makefile
View File

@ -48,7 +48,7 @@ KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU) \
KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
KBUILD_AFLAGS += $(compat_vdso)
ifeq ($(call test-ge, $(CONFIG_RUSTC_VERSION), 108500),y)
ifeq ($(call rustc-min-version, 108500),y)
KBUILD_RUSTFLAGS += --target=aarch64-unknown-none-softfloat
else
KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"

4
scripts/Makefile.compiler
View File

@ -67,6 +67,10 @@ gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1)
# Usage: cflags-$(call clang-min-version, 110000) += -foo
clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1)
# rustc-min-version
# Usage: rustc-$(call rustc-min-version, 108500) += -Cfoo
rustc-min-version = $(call test-ge, $(CONFIG_RUSTC_VERSION), $1)
# ld-option
# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))