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tools build: Fix rust cross compilation

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Currently no target is specified to compile rust code when needed, which
breaks cross compilation. E.g. for arm64:

      LD      /tmp/build/tests/workloads/perf-test-in.o
    aarch64-linux-gnu-ld: /tmp/build/tests/workloads/code_with_type.a(code_with_type.code_with_type.d12f4324cb53c560-cgu.0.rcgu.o): Relocations in generic ELF (EM: 62)
    aarch64-linux-gnu-ld: /tmp/build/tests/workloads/code_with_type.a(code_with_type.code_with_type.d12f4324cb53c560-cgu.0.rcgu.o): Relocations in generic ELF (EM: 62)
    [...repeated...]
    aarch64-linux-gnu-ld: /tmp/build/tests/workloads/code_with_type.a(code_with_type.code_with_type.d12f4324cb53c560-cgu.0.rcgu.o): Relocations in generic ELF (EM: 62)
    aarch64-linux-gnu-ld: /tmp/build/tests/workloads/code_with_type.a(code_with_type.code_with_type.d12f4324cb53c560-cgu.0.rcgu.o): Relocations in generic ELF (EM: 62)
    aarch64-linux-gnu-ld: /tmp/build/tests/workloads/code_with_type.a: error adding symbols: file in wrong format
    make[5]: *** [/perf/tools/build/Makefile.build:162: /tmp/build/tests/workloads/perf-test-in.o] Error 1
    make[4]: *** [/perf/tools/build/Makefile.build:156: workloads] Error 2
    make[3]: *** [/perf/tools/build/Makefile.build:156: tests] Error 2
    make[2]: *** [Makefile.perf:785: /tmp/build/perf-test-in.o] Error 2
    make[2]: *** Waiting for unfinished jobs....
    make[1]: *** [Makefile.perf:289: sub-make] Error 2
    make: *** [Makefile:76: all] Error 2

Detect required target and pass it via rust_flags to the compiler.

Note that CROSS_COMPILE might be different from what rust compiler
expects, since it may omit the target vendor value, e.g.
"aarch64-linux-gnu" instead of "aarch64-unknown-linux-gnu".

Thus explicitly map supported CROSS_COMPILE values to corresponding Rust
versions, as suggested by Miguel Ojeda.

Tested using arm64 cross-compilation example from [1].

Fixes: 2e05bb52a1 ("perf test workload: Add code_with_type test workload")
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Levi Zim <i@kxxt.dev>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nsc@kernel.org>
Link: https://perfwiki.github.io/main/arm64-cross-compilation-dockerfile/ [1]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Dmitrii Dolgov
2026-02-26 17:59:59 +01:00
committed by Arnaldo Carvalho de Melo
parent b6712d91f8
commit 30f998c992
3 changed files with 28 additions and 1 deletions
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9
tools/build/Build.include
View File

@@ -98,6 +98,15 @@ c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1))
c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2))
cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj))
###
# Rust flags to be used on rule definition, includes:
# - global $(RUST_FLAGS)
# - per target Rust flags
# - per object Rust flags
rust_flags_1 = $(RUST_FLAGS) $(RUST_FLAGS_$(basetarget).o) $(RUST_FLAGS_$(obj))
rust_flags_2 = $(filter-out $(RUST_FLAGS_REMOVE_$(basetarget).o), $(rust_flags_1))
rust_flags = $(filter-out $(RUST_FLAGS_REMOVE_$(obj)), $(rust_flags_2))
###
## HOSTCC C flags

18
tools/perf/Makefile.config
View File

@@ -1163,6 +1163,24 @@ ifndef NO_RUST
CFLAGS += -DHAVE_RUST_SUPPORT
$(call detected,CONFIG_RUST_SUPPORT)
endif
ifneq ($(CROSS_COMPILE),)
RUST_TARGET_FLAGS_arm := arm-unknown-linux-gnueabi
RUST_TARGET_FLAGS_arm64 := aarch64-unknown-linux-gnu
RUST_TARGET_FLAGS_m68k := m68k-unknown-linux-gnu
RUST_TARGET_FLAGS_mips := mipsel-unknown-linux-gnu
RUST_TARGET_FLAGS_powerpc := powerpc64le-unknown-linux-gnu
RUST_TARGET_FLAGS_riscv := riscv64gc-unknown-linux-gnu
RUST_TARGET_FLAGS_s390 := s390x-unknown-linux-gnu
RUST_TARGET_FLAGS_x86 := x86_64-unknown-linux-gnu
RUST_TARGET_FLAGS_x86_64 := x86_64-unknown-linux-gnu
ifeq ($(RUST_TARGET_FLAGS_$(ARCH)),)
$(error Unknown rust cross compilation architecture $(ARCH))
endif
RUST_FLAGS += --target=$(RUST_TARGET_FLAGS_$(ARCH))
endif
endif
# Among the variables below, these:

2
tools/perf/Makefile.perf
View File

@@ -274,7 +274,7 @@ ifeq ($(PYLINT),1)
PYLINT := $(shell which pylint 2> /dev/null)
endif
export srctree OUTPUT RM CC CXX RUSTC LD AR CFLAGS CXXFLAGS V BISON FLEX AWK
export srctree OUTPUT RM CC CXX RUSTC LD AR CFLAGS CXXFLAGS RUST_FLAGS V BISON FLEX AWK
export HOSTCC HOSTLD HOSTAR HOSTCFLAGS SHELLCHECK MYPY PYLINT
include $(srctree)/tools/build/Makefile.include