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Merged
anakryiko merged 3 commits into from
Dec 4, 2025
Merged

examples/c: Add support for cross compilation. #356

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9e7a687
examples/c: Add support for cross compiling.
Nov 27, 2025
cb2b844
examples/c: Unify the way to get the path of libblazesym.
Dec 3, 2025
1b65adf
Change the dependency from blazesym-build to blazesym to avoid some p…
Dec 3, 2025
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60 changes: 50 additions & 10 deletions examples/c/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ ExternalProject_Add(libbpf
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../libbpf/src
CONFIGURE_COMMAND ""
BUILD_COMMAND make
CC=${CMAKE_C_COMPILER}
BUILD_STATIC_ONLY=1
OBJDIR=${CMAKE_CURRENT_BINARY_DIR}/libbpf/libbpf
DESTDIR=${CMAKE_CURRENT_BINARY_DIR}/libbpf
Expand All @@ -38,15 +39,53 @@ ExternalProject_Add(bpftool

find_program(CARGO_EXISTS cargo)
if(CARGO_EXISTS)
ExternalProject_Add(blazesym
PREFIX blazesym
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym
CONFIGURE_COMMAND ""
BUILD_COMMAND cargo build --package=blazesym-c --release
BUILD_IN_SOURCE TRUE
INSTALL_COMMAND ""
STEP_TARGETS build
)
if(CMAKE_CROSSCOMPILING)
# Determine target triple
if(CMAKE_SYSTEM_NAME MATCHES "Linux")
if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
set(CARGO_TARGET "x86_64-unknown-linux-gnu")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
set(CARGO_TARGET "aarch64-unknown-linux-gnu")
else()
message(FATAL_ERROR "Unsupported processor for Linux: ${CMAKE_SYSTEM_PROCESSOR}")
endif()

if(CMAKE_CXX_COMPILER)
set(RUST_LINKER ${CMAKE_CXX_COMPILER})
else()
set(RUST_LINKER ${CMAKE_C_COMPILER})
endif()
else()
message((FATAL_ERROR "Unsupported platform: ${CMAKE_SYSTEM_NAME}"))
endif()

set(LIBBLAZESYM_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym/target/${CARGO_TARGET}/release/libblazesym_c.a)

ExternalProject_Add(blazesym
PREFIX blazesym
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym
CONFIGURE_COMMAND ""
BUILD_COMMAND ${CMAKE_COMMAND} -E env
RUSTFLAGS=-C\ linker=${RUST_LINKER}
cargo build --package=blazesym-c --release --target=${CARGO_TARGET}
BUILD_IN_SOURCE TRUE
INSTALL_COMMAND ""
STEP_TARGETS build
)
else() # Host
set(LIBBLAZESYM_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym/target/release/libblazesym_c.a)

ExternalProject_Add(blazesym
PREFIX blazesym
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym
CONFIGURE_COMMAND ""
BUILD_COMMAND
cargo build --package=blazesym-c --release
BUILD_IN_SOURCE TRUE
INSTALL_COMMAND ""
STEP_TARGETS build
)
endif()
endif()

# Set BpfObject input parameters -- note this is usually not necessary unless
Expand Down Expand Up @@ -91,6 +130,7 @@ foreach(app ${apps})
target_include_directories(${app_stem} PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym/capi/include)
target_link_libraries(${app_stem}
${CMAKE_CURRENT_SOURCE_DIR}/../../blazesym/target/release/libblazesym_c.a -lpthread -lrt -ldl)
${LIBBLAZESYM_PATH} -lpthread -lrt -ldl)
add_dependencies(${app_stem} blazesym-build)
endif()
endforeach()
22 changes: 12 additions & 10 deletions tools/cmake/FindBpfObject.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -139,18 +139,20 @@ else()
endif()

# Get target arch
execute_process(COMMAND uname -m
COMMAND sed -e "s/x86_64/x86/" -e "s/aarch64/arm64/" -e "s/ppc64le/powerpc/" -e "s/mips.*/mips/" -e "s/riscv64/riscv/"
OUTPUT_VARIABLE ARCH_output
ERROR_VARIABLE ARCH_error
RESULT_VARIABLE ARCH_result
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(${ARCH_result} EQUAL 0)
set(ARCH ${ARCH_output})
message(STATUS "BPF target arch: ${ARCH}")
if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
set(ARCH x86)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
set(ARCH arm64)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le")
set(ARCH powerpc)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "mips")
set(ARCH mips)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64")
set(ARCH riscv)
else()
message(FATAL_ERROR "Failed to determine target architecture: ${ARCH_error}")
set(ARCH ${CMAKE_SYSTEM_PROCESSOR})
endif()
message(STATUS "BPF target arch: ${ARCH}")

# Public macro
macro(bpf_object name input)
Expand Down