#[=======================================================================[.rst:
FindRust
--------
Find Rust
This module finds an installed rustc compiler and the cargo build tool. If Rust
is managed by rustup it determines the available toolchains and returns a
concrete Rust version, not a rustup proxy.
#]=======================================================================]
cmake_minimum_required(VERSION 3.12)
# search for Cargo here and set up a bunch of cool flags and stuff
include(FindPackageHandleStandardArgs)
list(APPEND CMAKE_MESSAGE_CONTEXT "FindRust")
# Print error message and return.
macro(_findrust_failed)
if("${Rust_FIND_REQUIRED}")
message(FATAL_ERROR ${ARGN})
elseif(NOT "${Rust_FIND_QUIETLY}")
message(WARNING ${ARGN})
endif()
# Note: PARENT_SCOPE is the scope of the caller of the caller of this macro.
set(Rust_FOUND "" PARENT_SCOPE)
return()
endmacro()
# Checks if the actual version of a Rust toolchain matches the VERSION requirements specified in find_package.
function(_findrust_version_ok ACTUAL_VERSION OUT_IS_OK)
if(DEFINED Rust_FIND_VERSION_RANGE)
if(Rust_FIND_VERSION_RANGE_MAX STREQUAL "INCLUDE")
set(COMPARSION_OPERATOR "VERSION_LESS_EQUAL")
elseif(Rust_FIND_VERSION_RANGE_MAX STREQUAL "EXCLUDE")
set(COMPARSION_OPERATOR "VERSION_LESS")
else()
message(FATAL_ERROR "Unexpected value in `<PackageName>_FIND_VERSION_RANGE_MAX`: "
"`${Rust_FIND_VERSION_RANGE_MAX}`.")
endif()
if(("${ACTUAL_VERSION}" VERSION_GREATER_EQUAL "${Rust_FIND_VERSION_RANGE_MIN}")
AND
( "${ACTUAL_VERSION}" ${COMPARSION_OPERATOR} "${Rust_FIND_VERSION_RANGE_MAX}" )
)
set("${OUT_IS_OK}" TRUE PARENT_SCOPE)
else()
set("${OUT_IS_OK}" FALSE PARENT_SCOPE)
endif()
elseif(DEFINED Rust_FIND_VERSION)
if(Rust_VERSION_EXACT)
set(COMPARISON_OPERATOR VERSION_EQUAL)
else()
set(COMPARISON_OPERATOR VERSION_GREATER_EQUAL)
endif()
if(_TOOLCHAIN_${_TOOLCHAIN_SELECTED}_VERSION "${COMPARISON_OPERATOR}" Rust_FIND_VERSION)
set("${OUT_IS_OK}" TRUE PARENT_SCOPE)
else()
set("${OUT_IS_OK}" FALSE PARENT_SCOPE)
endif()
else()
# if no VERSION requirement was specified, the version is always okay.
set("${OUT_IS_OK}" TRUE PARENT_SCOPE)
endif()
endfunction()
function(_corrosion_strip_target_triple input_triple_or_path output_triple)
# If the target_triple is a path to a custom target specification file, then strip everything
# except the filename from `target_triple`.
get_filename_component(target_triple_ext "${input_triple_or_path}" EXT)
set(target_triple "${input_triple_or_path}")
if(target_triple_ext)
if(target_triple_ext STREQUAL ".json")
get_filename_component(target_triple "${input_triple_or_path}" NAME_WE)
endif()
endif()
set(${output_triple} "${target_triple}" PARENT_SCOPE)
endfunction()
function(_corrosion_parse_target_triple target_triple out_arch out_vendor out_os out_env)
_corrosion_strip_target_triple(${target_triple} target_triple)
# The vendor part may be left out from the target triple, and since `env` is also optional,
# we determine if vendor is present by matching against a list of known vendors.
set(known_vendors
"apple"
"esp[a-z0-9]*" # espressif, e.g. riscv32imc-esp-espidf or xtensa-esp32s3-none-elf
"fortanix"
"kmc"
"pc"
"nintendo"
"nvidia"
"openwrt"
"alpine"
"chimera"
"unikraft"
"unknown"
"uwp" # aarch64-uwp-windows-msvc
"wrs" # e.g. aarch64-wrs-vxworks
"sony"
"sun"
)
# todo: allow users to add additional vendors to the list via a cmake variable.
list(JOIN known_vendors "|" known_vendors_joined)
# vendor is optional - We detect if vendor is present by matching against a known list of
# vendors. The next field is the OS, which we assume to always be present, while the last field
# is again optional and contains the environment.
string(REGEX MATCH
"^([a-z0-9_\.]+)-((${known_vendors_joined})-)?([a-z0-9_]+)(-([a-z0-9_]+))?$"
whole_match
"${target_triple}"
)
if((NOT whole_match) AND (NOT CORROSION_NO_WARN_PARSE_TARGET_TRIPLE_FAILED))
message(WARNING "Failed to parse target-triple `${target_triple}`."
"Corrosion determines some information about the output artifacts based on OS "
"specified in the Rust target-triple.\n"
"Currently this is relevant for windows and darwin (mac) targets, since file "
"extensions differ.\n"
"Note: If you are targeting a different OS you can suppress this warning by"
" setting the CMake cache variable "
"`CORROSION_NO_WARN_PARSE_TARGET_TRIPLE_FAILED`."
"Please consider opening an issue on github if you you need to add a new vendor to the list."
)
endif()
message(DEBUG "Parsed Target triple: arch: ${CMAKE_MATCH_1}, vendor: ${CMAKE_MATCH_3}, "
"OS: ${CMAKE_MATCH_4}, env: ${CMAKE_MATCH_6}")
set("${out_arch}" "${CMAKE_MATCH_1}" PARENT_SCOPE)
set("${out_vendor}" "${CMAKE_MATCH_3}" PARENT_SCOPE)
set("${out_os}" "${CMAKE_MATCH_4}" PARENT_SCOPE)
set("${out_env}" "${CMAKE_MATCH_6}" PARENT_SCOPE)
endfunction()
function(_corrosion_determine_libs_new target_triple out_libs out_flags)
set(package_dir "${CMAKE_BINARY_DIR}/corrosion/required_libs")
# Cleanup on reconfigure to get a cleans state (in case we change something in the future)
file(REMOVE_RECURSE "${package_dir}")
file(MAKE_DIRECTORY "${package_dir}")
set(manifest "[package]\nname = \"required_libs\"\nedition = \"2018\"\nversion = \"0.1.0\"\n")
string(APPEND manifest "\n[lib]\ncrate-type=[\"staticlib\"]\npath = \"lib.rs\"\n")
string(APPEND manifest "\n[workspace]\n")
file(WRITE "${package_dir}/Cargo.toml" "${manifest}")
file(WRITE "${package_dir}/lib.rs" "pub fn add(left: usize, right: usize) -> usize {left + right}\n")
execute_process(
COMMAND ${CMAKE_COMMAND} -E env
"CARGO_BUILD_RUSTC=${Rust_COMPILER_CACHED}"
${Rust_CARGO_CACHED} rustc --verbose --color never --target=${target_triple} -- --print=native-static-libs
WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/corrosion/required_libs"
RESULT_VARIABLE cargo_build_result
ERROR_VARIABLE cargo_build_error_message
)
if(cargo_build_result)
message(DEBUG "Determining required native libraries - failed: ${cargo_build_result}.")
message(TRACE "The cargo build error was: ${cargo_build_error_message}")
message(DEBUG "Note: This is expected for Rust targets without std support")
return()
else()
# The pattern starts with `native-static-libs:` and goes to the end of the line.
if(cargo_build_error_message MATCHES "native-static-libs: ([^\r\n]+)\r?\n")
string(REPLACE " " ";" "libs_list" "${CMAKE_MATCH_1}")
set(stripped_lib_list "")
set(flag_list "")
set(was_last_framework OFF)
foreach(lib ${libs_list})
# merge -framework;lib -> "-framework lib" as CMake does de-duplication of link libraries, and -framework prefix is required
if (lib STREQUAL "-framework")
set(was_last_framework ON)
continue()
endif()
if (was_last_framework)
list(APPEND stripped_lib_list "-framework ${lib}")
set(was_last_framework OFF)
continue()
endif()
# Flags start with / for MSVC
if (lib MATCHES "^/" AND ${target_triple} MATCHES "msvc$")
list(APPEND flag_list "${lib}")
else()
# Strip leading `-l` (unix) and potential .lib suffix (windows)
string(REGEX REPLACE "^-l" "" "stripped_lib" "${lib}")
string(REGEX REPLACE "\.lib$" "" "stripped_lib" "${stripped_lib}")
list(APPEND stripped_lib_list "${stripped_lib}")
endif()
endforeach()
set(libs_list "${stripped_lib_list}")
# Special case `msvcrt` to link with the debug version in Debug mode.
list(TRANSFORM libs_list REPLACE "^msvcrt$" "\$<\$<CONFIG:Debug>:msvcrtd>")
else()
message(DEBUG "Determining required native libraries - failed: Regex match failure.")
message(DEBUG "`native-static-libs` not found in: `${cargo_build_error_message}`")
return()
endif()
endif()
set("${out_libs}" "${libs_list}" PARENT_SCOPE)
set("${out_flags}" "${flag_list}" PARENT_SCOPE)
endfunction()
if (NOT "${Rust_TOOLCHAIN}" STREQUAL "$CACHE{Rust_TOOLCHAIN}")
# Promote Rust_TOOLCHAIN to a cache variable if it is not already a cache variable
set(Rust_TOOLCHAIN ${Rust_TOOLCHAIN} CACHE STRING "Requested rustup toolchain" FORCE)
endif()
set(_RESOLVE_RUSTUP_TOOLCHAINS_DESC "Indicates whether to descend into the toolchain pointed to by rustup")
set(Rust_RESOLVE_RUSTUP_TOOLCHAINS ON CACHE BOOL ${_RESOLVE_RUSTUP_TOOLCHAINS_DESC})
# This block checks to see if we're prioritizing a rustup-managed toolchain.
if (DEFINED Rust_TOOLCHAIN)
# If the user specifies `Rust_TOOLCHAIN`, then look for `rustup` first, rather than `rustc`.
find_program(Rust_RUSTUP rustup PATHS "$ENV{HOME}/.cargo/bin")
if(NOT Rust_RUSTUP)
if(NOT "${Rust_FIND_QUIETLY}")
message(
WARNING "CMake variable `Rust_TOOLCHAIN` specified, but `rustup` was not found. "
"Ignoring toolchain and looking for a Rust toolchain not managed by rustup.")
endif()
endif()
else()
# If we aren't definitely using a rustup toolchain, look for rustc first - the user may have
# a toolchain installed via a method other than rustup higher in the PATH, which should be
# preferred. However, if the first-found rustc is a rustup proxy, then we'll revert to
# finding the preferred toolchain via rustup.
# Uses `Rust_COMPILER` to let user-specified `rustc` win. But we will still "override" the
# user's setting if it is pointing to `rustup`. Default rustup install path is provided as a
# backup if a toolchain cannot be found in the user's PATH.
if (DEFINED Rust_COMPILER)
set(_Rust_COMPILER_TEST "${Rust_COMPILER}")
set(_USER_SPECIFIED_RUSTC ON)
if(NOT (EXISTS "${_Rust_COMPILER_TEST}" AND NOT IS_DIRECTORY "${_Rust_COMPILER_TEST}"))
set(_ERROR_MESSAGE "Rust_COMPILER was set to `${Rust_COMPILER}`, but this file does "
"not exist."
)
_findrust_failed(${_ERROR_MESSAGE})
return()
endif()
else()
find_program(_Rust_COMPILER_TEST rustc PATHS "$ENV{HOME}/.cargo/bin")
if(NOT EXISTS "${_Rust_COMPILER_TEST}")
set(_ERROR_MESSAGE "`rustc` not found in PATH or `$ENV{HOME}/.cargo/bin`.\n"
"Hint: Check if `rustc` is in PATH or manually specify the location "
"by setting `Rust_COMPILER` to the path to `rustc`.")
_findrust_failed(${_ERROR_MESSAGE})
endif()
endif()
# Check if the discovered rustc is actually a "rustup" proxy.
execute_process(
COMMAND
${CMAKE_COMMAND} -E env
RUSTUP_FORCE_ARG0=rustup
"${_Rust_COMPILER_TEST}" --version
OUTPUT_VARIABLE _RUSTC_VERSION_RAW
ERROR_VARIABLE _RUSTC_VERSION_STDERR
RESULT_VARIABLE _RUSTC_VERSION_RESULT
)
if(NOT (_RUSTC_VERSION_RESULT EQUAL "0"))
_findrust_failed("`${_Rust_COMPILER_TEST} --version` failed with ${_RUSTC_VERSION_RESULT}\n"
"rustc stderr:\n${_RUSTC_VERSION_STDERR}"
)
endif()
if (_RUSTC_VERSION_RAW MATCHES "rustup [0-9\\.]+")
if (_USER_SPECIFIED_RUSTC)
message(
WARNING "User-specified Rust_COMPILER pointed to rustup's rustc proxy. Corrosion's "
"FindRust will always try to evaluate to an actual Rust toolchain, and so the "
"user-specified Rust_COMPILER will be discarded in favor of the default "
"rustup-managed toolchain."
)
unset(Rust_COMPILER)
unset(Rust_COMPILER CACHE)
endif()
# Get `rustup` next to the `rustc` proxy
get_filename_component(_RUST_PROXIES_PATH "${_Rust_COMPILER_TEST}" DIRECTORY)
find_program(Rust_RUSTUP rustup HINTS "${_RUST_PROXIES_PATH}" NO_DEFAULT_PATH)
endif()
unset(_Rust_COMPILER_TEST CACHE)
endif()
# At this point, the only thing we should have evaluated is a path to `rustup` _if that's what the
# best source for a Rust toolchain was determined to be_.
if (NOT Rust_RUSTUP)
set(Rust_RESOLVE_RUSTUP_TOOLCHAINS OFF CACHE BOOL ${_RESOLVE_RUSTUP_TOOLCHAINS_DESC} FORCE)
endif()
# List of user variables that will override any toolchain-provided setting
set(_Rust_USER_VARS Rust_COMPILER Rust_CARGO Rust_CARGO_TARGET Rust_CARGO_HOST_TARGET)
foreach(_VAR ${_Rust_USER_VARS})
if (DEFINED "${_VAR}")
set(${_VAR}_CACHED "${${_VAR}}" CACHE INTERNAL "Internal cache of ${_VAR}")
else()
unset(${_VAR}_CACHED CACHE)
endif()
endforeach()
# Discover what toolchains are installed by rustup, if the discovered `rustc` is a proxy from
# `rustup` and the user hasn't explicitly requested to override this behavior, then select either
# the default toolchain, or the requested toolchain Rust_TOOLCHAIN
if (Rust_RESOLVE_RUSTUP_TOOLCHAINS)
execute_process(
COMMAND
"${Rust_RUSTUP}" toolchain list --verbose
OUTPUT_VARIABLE _TOOLCHAINS_RAW
)
string(REPLACE "\n" ";" _TOOLCHAINS_RAW "${_TOOLCHAINS_RAW}")
set(_DISCOVERED_TOOLCHAINS "")
set(_DISCOVERED_TOOLCHAINS_RUSTC_PATH "")
set(_DISCOVERED_TOOLCHAINS_CARGO_PATH "")
set(_DISCOVERED_TOOLCHAINS_VERSION "")
foreach(_TOOLCHAIN_RAW ${_TOOLCHAINS_RAW})
if (_TOOLCHAIN_RAW MATCHES "([a-zA-Z0-9\\._\\-]+)[ \t\r\n]?(\\(default\\) \\(override\\)|\\(default\\)|\\(override\\))?[ \t\r\n]+(.+)")
set(_TOOLCHAIN "${CMAKE_MATCH_1}")
set(_TOOLCHAIN_TYPE "${CMAKE_MATCH_2}")
set(_TOOLCHAIN_PATH "${CMAKE_MATCH_3}")
set(_TOOLCHAIN_${_TOOLCHAIN}_PATH "${CMAKE_MATCH_3}")
if (_TOOLCHAIN_TYPE MATCHES ".*\\(default\\).*")
set(_TOOLCHAIN_DEFAULT "${_TOOLCHAIN}")
endif()
if (_TOOLCHAIN_TYPE MATCHES ".*\\(override\\).*")
set(_TOOLCHAIN_OVERRIDE "${_TOOLCHAIN}")
endif()
execute_process(
COMMAND
"${_TOOLCHAIN_PATH}/bin/rustc" --version
OUTPUT_VARIABLE _TOOLCHAIN_RAW_VERSION
)
if (_TOOLCHAIN_RAW_VERSION MATCHES "rustc ([0-9]+)\\.([0-9]+)\\.([0-9]+)(-nightly)?")
list(APPEND _DISCOVERED_TOOLCHAINS "${_TOOLCHAIN}")
list(APPEND _DISCOVERED_TOOLCHAINS_RUSTC_PATH "${_TOOLCHAIN_PATH}/bin/rustc")
list(APPEND _DISCOVERED_TOOLCHAINS_VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}")
# We need this variable to determine the default toolchain, since `foreach(... IN ZIP_LISTS ...)`
# requires CMake 3.17. As a workaround we define this variable to lookup the version when iterating
# through the `_DISCOVERED_TOOLCHAINS` lists.
set(_TOOLCHAIN_${_TOOLCHAIN}_VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}")
if(CMAKE_MATCH_4)
set(_TOOLCHAIN_${_TOOLCHAIN}_IS_NIGHTLY "TRUE")
else()
set(_TOOLCHAIN_${_TOOLCHAIN}_IS_NIGHTLY "FALSE")
endif()
if(EXISTS "${_TOOLCHAIN_PATH}/bin/cargo")
list(APPEND _DISCOVERED_TOOLCHAINS_CARGO_PATH "${_TOOLCHAIN_PATH}/bin/cargo")
else()
list(APPEND _DISCOVERED_TOOLCHAINS_CARGO_PATH "NOTFOUND")
endif()
else()
message(AUTHOR_WARNING "Unexpected output from `rustc --version` for Toolchain `${_TOOLCHAIN}`: "
"`${_TOOLCHAIN_RAW_VERSION}`.\n"
"Ignoring this toolchain."
)
endif()
else()
message(AUTHOR_WARNING "Didn't recognize toolchain: ${_TOOLCHAIN_RAW}. Ignoring this toolchain.\n"
"Rustup toolchain list output( `${Rust_RUSTUP} toolchain list --verbose`):\n"
"${_TOOLCHAINS_RAW}"
)
endif()
endforeach()
# Expose a list of available rustup toolchains.
list(LENGTH _DISCOVERED_TOOLCHAINS _toolchain_len)
list(LENGTH _DISCOVERED_TOOLCHAINS_RUSTC_PATH _toolchain_rustc_len)
list(LENGTH _DISCOVERED_TOOLCHAINS_CARGO_PATH _toolchain_cargo_len)
list(LENGTH _DISCOVERED_TOOLCHAINS_VERSION _toolchain_version_len)
if(NOT
(_toolchain_len EQUAL _toolchain_rustc_len
AND _toolchain_cargo_len EQUAL _toolchain_version_len
AND _toolchain_len EQUAL _toolchain_cargo_len)
)
message(FATAL_ERROR "Internal error - list length mismatch."
"List lengths: ${_toolchain_len} toolchains, ${_toolchain_rustc_len} rustc, ${_toolchain_cargo_len} cargo,"
" ${_toolchain_version_len} version. The lengths should be the same."
)
endif()
set(Rust_RUSTUP_TOOLCHAINS CACHE INTERNAL "List of available Rustup toolchains" "${_DISCOVERED_TOOLCHAINS}")
set(Rust_RUSTUP_TOOLCHAINS_RUSTC_PATH
CACHE INTERNAL
"List of the rustc paths corresponding to the toolchain at the same index in `Rust_RUSTUP_TOOLCHAINS`."
"${_DISCOVERED_TOOLCHAINS_RUSTC_PATH}"
)
set(Rust_RUSTUP_TOOLCHAINS_CARGO_PATH
CACHE INTERNAL
"List of the cargo paths corresponding to the toolchain at the same index in `Rust_RUSTUP_TOOLCHAINS`. \
May also be `NOTFOUND` if the toolchain does not have a cargo executable."
"${_DISCOVERED_TOOLCHAINS_CARGO_PATH}"
)
set(Rust_RUSTUP_TOOLCHAINS_VERSION
CACHE INTERNAL
"List of the rust toolchain version corresponding to the toolchain at the same index in \
`Rust_RUSTUP_TOOLCHAINS`."
"${_DISCOVERED_TOOLCHAINS_VERSION}"
)
# Rust_TOOLCHAIN is preferred over a requested version if it is set.
if (NOT DEFINED Rust_TOOLCHAIN)
if (NOT DEFINED _TOOLCHAIN_OVERRIDE)
set(_TOOLCHAIN_SELECTED "${_TOOLCHAIN_DEFAULT}")
else()
set(_TOOLCHAIN_SELECTED "${_TOOLCHAIN_OVERRIDE}")
endif()
# Check default toolchain first.
_findrust_version_ok("_TOOLCHAIN_${_TOOLCHAIN_SELECTED}_VERSION" _VERSION_OK)
if(NOT "${_VERSION_OK}")
foreach(_TOOLCHAIN "${_DISCOVERED_TOOLCHAINS}")
_findrust_version_ok("_TOOLCHAIN_${_TOOLCHAIN}_VERSION" _VERSION_OK)
if("${_VERSION_OK}")
set(_TOOLCHAIN_SELECTED "${_TOOLCHAIN}")
break()
endif()
endforeach()
# Check if we found a suitable version in the for loop.
if(NOT "${_VERSION_OK}")
string(REPLACE ";" "\n" _DISCOVERED_TOOLCHAINS "${_DISCOVERED_TOOLCHAINS}")
_findrust_failed("Failed to find a Rust toolchain matching the version requirements of "
"${Rust_FIND_VERSION}. Available toolchains: ${_DISCOVERED_TOOLCHAINS}")
endif()
endif()
endif()
set(Rust_TOOLCHAIN "${_TOOLCHAIN_SELECTED}" CACHE STRING "The rustup toolchain to use")
set_property(CACHE Rust_TOOLCHAIN PROPERTY STRINGS "${_DISCOVERED_TOOLCHAINS}")
if(NOT Rust_FIND_QUIETLY)
message(STATUS "Rust Toolchain: ${Rust_TOOLCHAIN}")
endif()
if (NOT Rust_TOOLCHAIN IN_LIST _DISCOVERED_TOOLCHAINS)
# If the precise toolchain wasn't found, try appending the default host
execute_process(
COMMAND
"${Rust_RUSTUP}" show
RESULT_VARIABLE _SHOW_RESULT
OUTPUT_VARIABLE _SHOW_RAW
)
if(NOT "${_SHOW_RESULT}" EQUAL "0")
_findrust_failed("Command `${Rust_RUSTUP} show` failed")
endif()
if (_SHOW_RAW MATCHES "Default host: ([a-zA-Z0-9_\\-]*)\n")
set(_DEFAULT_HOST "${CMAKE_MATCH_1}")
else()
_findrust_failed("Failed to parse \"Default host\" from `${Rust_RUSTUP} show`. Got: ${_SHOW_RAW}")
endif()
if (NOT "${Rust_TOOLCHAIN}-${_DEFAULT_HOST}" IN_LIST _DISCOVERED_TOOLCHAINS)
set(_NOT_FOUND_MESSAGE "Could not find toolchain '${Rust_TOOLCHAIN}'\n"
"Available toolchains:\n"
)
foreach(_TOOLCHAIN ${_DISCOVERED_TOOLCHAINS})
list(APPEND _NOT_FOUND_MESSAGE " `${_TOOLCHAIN}`\n")
endforeach()
_findrust_failed(${_NOT_FOUND_MESSAGE})
endif()
set(_RUSTUP_TOOLCHAIN_FULL "${Rust_TOOLCHAIN}-${_DEFAULT_HOST}")
else()
set(_RUSTUP_TOOLCHAIN_FULL "${Rust_TOOLCHAIN}")
endif()
set(_RUST_TOOLCHAIN_PATH "${_TOOLCHAIN_${_RUSTUP_TOOLCHAIN_FULL}_PATH}")
if(NOT "${Rust_FIND_QUIETLY}")
message(VERBOSE "Rust toolchain ${_RUSTUP_TOOLCHAIN_FULL}")
message(VERBOSE "Rust toolchain path ${_RUST_TOOLCHAIN_PATH}")
endif()
# Is overridden if the user specifies `Rust_COMPILER` explicitly.
find_program(
Rust_COMPILER_CACHED
rustc
HINTS "${_RUST_TOOLCHAIN_PATH}/bin"
NO_DEFAULT_PATH)
elseif (Rust_RUSTUP)
get_filename_component(_RUST_TOOLCHAIN_PATH "${Rust_RUSTUP}" DIRECTORY)
get_filename_component(_RUST_TOOLCHAIN_PATH "${_RUST_TOOLCHAIN_PATH}" DIRECTORY)
find_program(
Rust_COMPILER_CACHED
rustc
HINTS "${_RUST_TOOLCHAIN_PATH}/bin"
NO_DEFAULT_PATH)
else()
find_program(Rust_COMPILER_CACHED rustc)
if (EXISTS "${Rust_COMPILER_CACHED}")
# rustc is expected to be at `<toolchain_path>/bin/rustc`.
get_filename_component(_RUST_TOOLCHAIN_PATH "${Rust_COMPILER_CACHED}" DIRECTORY)
get_filename_component(_RUST_TOOLCHAIN_PATH "${_RUST_TOOLCHAIN_PATH}" DIRECTORY)
endif()
endif()
if (NOT EXISTS "${Rust_COMPILER_CACHED}")
set(_NOT_FOUND_MESSAGE "The rustc executable was not found. "
"Rust not installed or ~/.cargo/bin not added to path?\n"
"Hint: Consider setting `Rust_COMPILER` to the absolute path of `rustc`."
)
_findrust_failed(${_NOT_FOUND_MESSAGE})
endif()
if (Rust_RESOLVE_RUSTUP_TOOLCHAINS)
set(_NOT_FOUND_MESSAGE "Rust was detected to be managed by rustup, but failed to find `cargo` "
"next to `rustc` in `${_RUST_TOOLCHAIN_PATH}/bin`. This can happen for custom toolchains, "
"if cargo was not built. "
"Please manually specify the path to a compatible `cargo` by setting `Rust_CARGO`."
)
find_program(
Rust_CARGO_CACHED
cargo
HINTS "${_RUST_TOOLCHAIN_PATH}/bin"
NO_DEFAULT_PATH
)
# note: maybe can use find_package_handle_standard_args here, if we remove the _CACHED postfix.
# not sure why that is here...
if(NOT EXISTS "${Rust_CARGO_CACHED}")
_findrust_failed(${_NOT_FOUND_MESSAGE})
endif()
set(Rust_TOOLCHAIN_IS_RUSTUP_MANAGED TRUE CACHE INTERNAL "" FORCE)
else()
set(_NOT_FOUND_MESSAGE "Failed to find `cargo` in PATH and `${_RUST_TOOLCHAIN_PATH}/bin`.\n"
"Please ensure cargo is in PATH or manually specify the path to a compatible `cargo` by "
"setting `Rust_CARGO`."
)
# On some systems (e.g. NixOS) cargo is not managed by rustup and also not next to rustc.
find_program(
Rust_CARGO_CACHED
cargo
HINTS "${_RUST_TOOLCHAIN_PATH}/bin"
)
# note: maybe can use find_package_handle_standard_args here, if we remove the _CACHED postfix.
# not sure why that is here...
if(NOT EXISTS "${Rust_CARGO_CACHED}")
_findrust_failed(${_NOT_FOUND_MESSAGE})
endif()
endif()
execute_process(
COMMAND "${Rust_CARGO_CACHED}" --version --verbose
OUTPUT_VARIABLE _CARGO_VERSION_RAW
RESULT_VARIABLE _CARGO_VERSION_RESULT
)
# todo: check if cargo is a required component!
if(NOT ( "${_CARGO_VERSION_RESULT}" EQUAL "0" ))
_findrust_failed("Failed to get cargo version.\n"
"`${Rust_CARGO_CACHED} --version` failed with error: `${_CARGO_VERSION_RESULT}"
)
endif()
# todo: don't set cache variables here, but let find_package_handle_standard_args do the promotion
# later.
if (_CARGO_VERSION_RAW MATCHES "cargo ([0-9]+)\\.([0-9]+)\\.([0-9]+)")
set(Rust_CARGO_VERSION_MAJOR "${CMAKE_MATCH_1}" CACHE INTERNAL "" FORCE)
set(Rust_CARGO_VERSION_MINOR "${CMAKE_MATCH_2}" CACHE INTERNAL "" FORCE)
set(Rust_CARGO_VERSION_PATCH "${CMAKE_MATCH_3}" CACHE INTERNAL "" FORCE)
set(Rust_CARGO_VERSION "${Rust_CARGO_VERSION_MAJOR}.${Rust_CARGO_VERSION_MINOR}.${Rust_CARGO_VERSION_PATCH}" CACHE INTERNAL "" FORCE)
# Workaround for the version strings where the `cargo ` prefix is missing.
elseif(_CARGO_VERSION_RAW MATCHES "([0-9]+)\\.([0-9]+)\\.([0-9]+)")
set(Rust_CARGO_VERSION_MAJOR "${CMAKE_MATCH_1}" CACHE INTERNAL "" FORCE)
set(Rust_CARGO_VERSION_MINOR "${CMAKE_MATCH_2}" CACHE INTERNAL "" FORCE)
set(Rust_CARGO_VERSION_PATCH "${CMAKE_MATCH_3}" CACHE INTERNAL "" FORCE)
set(Rust_CARGO_VERSION "${Rust_CARGO_VERSION_MAJOR}.${Rust_CARGO_VERSION_MINOR}.${Rust_CARGO_VERSION_PATCH}" CACHE INTERNAL "" FORCE)
else()
_findrust_failed(
"Failed to parse cargo version. `cargo --version` evaluated to (${_CARGO_VERSION_RAW}). "
"Expected a <Major>.<Minor>.<Patch> version triple."
)
endif()
execute_process(
COMMAND "${Rust_COMPILER_CACHED}" --version --verbose
OUTPUT_VARIABLE _RUSTC_VERSION_RAW
RESULT_VARIABLE _RUSTC_VERSION_RESULT
)
if(NOT ( "${_RUSTC_VERSION_RESULT}" EQUAL "0" ))
_findrust_failed("Failed to get rustc version.\n"
"${Rust_COMPILER_CACHED} --version failed with error: `${_RUSTC_VERSION_RESULT}`")
endif()
if (_RUSTC_VERSION_RAW MATCHES "rustc ([0-9]+)\\.([0-9]+)\\.([0-9]+)(-nightly)?")
set(Rust_VERSION_MAJOR "${CMAKE_MATCH_1}" CACHE INTERNAL "" FORCE)
set(Rust_VERSION_MINOR "${CMAKE_MATCH_2}" CACHE INTERNAL "" FORCE)
set(Rust_VERSION_PATCH "${CMAKE_MATCH_3}" CACHE INTERNAL "" FORCE)
set(Rust_VERSION "${Rust_VERSION_MAJOR}.${Rust_VERSION_MINOR}.${Rust_VERSION_PATCH}" CACHE INTERNAL "" FORCE)
if(CMAKE_MATCH_4)
set(Rust_IS_NIGHTLY 1 CACHE INTERNAL "" FORCE)
else()
set(Rust_IS_NIGHTLY 0 CACHE INTERNAL "" FORCE)
endif()
else()
_findrust_failed("Failed to parse rustc version. `${Rust_COMPILER_CACHED} --version --verbose` "
"evaluated to:\n`${_RUSTC_VERSION_RAW}`"
)
endif()
if (_RUSTC_VERSION_RAW MATCHES "host: ([a-zA-Z0-9_\\-]*)\n")
set(Rust_DEFAULT_HOST_TARGET "${CMAKE_MATCH_1}")
set(Rust_CARGO_HOST_TARGET_CACHED "${Rust_DEFAULT_HOST_TARGET}" CACHE STRING "Host triple")
else()
_findrust_failed(
"Failed to parse rustc host target. `rustc --version --verbose` evaluated to:\n${_RUSTC_VERSION_RAW}"
)
endif()
if (_RUSTC_VERSION_RAW MATCHES "LLVM version: ([0-9]+)\\.([0-9]+)(\\.([0-9]+))?")
set(Rust_LLVM_VERSION_MAJOR "${CMAKE_MATCH_1}" CACHE INTERNAL "" FORCE)
set(Rust_LLVM_VERSION_MINOR "${CMAKE_MATCH_2}" CACHE INTERNAL "" FORCE)
# With the Rust toolchain 1.44.1 the reported LLVM version is 9.0, i.e. without a patch version.
# Since cmake regex does not support non-capturing groups, just ignore Match 3.
set(Rust_LLVM_VERSION_PATCH "${CMAKE_MATCH_4}" CACHE INTERNAL "" FORCE)
set(Rust_LLVM_VERSION "${Rust_LLVM_VERSION_MAJOR}.${Rust_LLVM_VERSION_MINOR}.${Rust_LLVM_VERSION_PATCH}" CACHE INTERNAL "" FORCE)
elseif(NOT Rust_FIND_QUIETLY)
message(
WARNING
"Failed to parse rustc LLVM version. `rustc --version --verbose` evaluated to:\n${_RUSTC_VERSION_RAW}"
)
endif()
if (NOT Rust_CARGO_TARGET_CACHED)
unset(_CARGO_ARCH)
unset(_CARGO_ABI)
if (WIN32)
if (CMAKE_VS_PLATFORM_NAME)
string(TOLOWER "${CMAKE_VS_PLATFORM_NAME}" LOWER_VS_PLATFORM_NAME)
if ("${LOWER_VS_PLATFORM_NAME}" STREQUAL "win32")
set(_CARGO_ARCH i686)
elseif("${LOWER_VS_PLATFORM_NAME}" STREQUAL "x64")
set(_CARGO_ARCH x86_64)
elseif("${LOWER_VS_PLATFORM_NAME}" STREQUAL "arm64")
set(_CARGO_ARCH aarch64)
else()
message(WARNING "VS Platform '${CMAKE_VS_PLATFORM_NAME}' not recognized")
endif()
endif()
# Fallback path
if(NOT DEFINED _CARGO_ARCH)
# Possible values for windows when not cross-compiling taken from here:
# https://learn.microsoft.com/en-us/windows/win32/winprog64/wow64-implementation-details
# When cross-compiling the user is expected to supply the value, so we match more variants.
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(AMD64|amd64|x86_64)$")
set(_CARGO_ARCH x86_64)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(ARM64|arm64|aarch64)$")
set(_CARGO_ARCH aarch64)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(X86|x86|i686)$")
set(_CARGO_ARCH i686)
elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "i586")
set(_CARGO_ARCH i586)
elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "IA64")
message(FATAL_ERROR "No rust target for Intel Itanium.")
elseif(NOT "${CMAKE_SYSTEM_PROCESSOR}")
message(WARNING "Failed to detect target architecture. Please set `CMAKE_SYSTEM_PROCESSOR`"
" to your target architecture or set `Rust_CARGO_TARGET` to your cargo target triple."
)
else()
message(WARNING "Failed to detect target architecture. Please set "
"`Rust_CARGO_TARGET` to your cargo target triple."
)
endif()
endif()
set(_CARGO_VENDOR "pc-windows")
# The MSVC Generators will always target the msvc ABI.
# For other generators we check the compiler ID and compiler target (if present)
# If no compiler is set and we are not cross-compiling then we just choose the
# default rust host target.
if(DEFINED MSVC
OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC"
OR "${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC"
OR "${CMAKE_CXX_COMPILER_TARGET}" MATCHES "-msvc$"
OR "${CMAKE_C_COMPILER_TARGET}" MATCHES "-msvc$"
)
set(_CARGO_ABI msvc)
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU"
OR "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU"
OR "${CMAKE_CXX_COMPILER_TARGET}" MATCHES "-gnu$"
OR "${CMAKE_C_COMPILER_TARGET}" MATCHES "-gnu$"
OR (NOT CMAKE_CROSSCOMPILING AND "${Rust_DEFAULT_HOST_TARGET}" MATCHES "-gnu$")
)
set(_CARGO_ABI gnu)
elseif(NOT "${CMAKE_CROSSCOMPILING}" AND "${Rust_DEFAULT_HOST_TARGET}" MATCHES "-msvc$")
# We first check if the gnu branch matches to ensure this fallback is only used
# if no compiler is enabled.
set(_CARGO_ABI msvc)
else()
message(WARNING "Could not determine the target ABI. Please specify `Rust_CARGO_TARGET` manually.")
endif()
if(DEFINED _CARGO_ARCH AND DEFINED _CARGO_VENDOR AND DEFINED _CARGO_ABI)
set(Rust_CARGO_TARGET_CACHED "${_CARGO_ARCH}-${_CARGO_VENDOR}-${_CARGO_ABI}"
CACHE STRING "Target triple")
endif()
elseif (ANDROID)
if (CMAKE_ANDROID_ARCH_ABI STREQUAL armeabi-v7a)
if (CMAKE_ANDROID_ARM_MODE)
set(_Rust_ANDROID_TARGET armv7-linux-androideabi)
else ()
set(_Rust_ANDROID_TARGET thumbv7neon-linux-androideabi)
endif()
elseif (CMAKE_ANDROID_ARCH_ABI STREQUAL arm64-v8a)
set(_Rust_ANDROID_TARGET aarch64-linux-android)
elseif (CMAKE_ANDROID_ARCH_ABI STREQUAL x86)
set(_Rust_ANDROID_TARGET i686-linux-android)
elseif (CMAKE_ANDROID_ARCH_ABI STREQUAL x86_64)
set(_Rust_ANDROID_TARGET x86_64-linux-android)
endif()
if (_Rust_ANDROID_TARGET)
set(Rust_CARGO_TARGET_CACHED "${_Rust_ANDROID_TARGET}" CACHE STRING "Target triple")
endif()
elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "OHOS")
if(CMAKE_OHOS_ARCH_ABI STREQUAL arm64-v8a)
set(_RUST_OHOS_TARGET aarch64-unknown-linux-ohos)
elseif(CMAKE_OHOS_ARCH_ABI STREQUAL armeabi-v7a)
set(_RUST_OHOS_TARGET armv7-unknown-linux-ohos)
elseif(CMAKE_OHOS_ARCH_ABI STREQUAL x86_64)
set(_RUST_OHOS_TARGET x86_64-unknown-linux-ohos)
else()
message(WARNING "unrecognized OHOS architecture: ${OHOS_ARCH}")
endif()
if(_RUST_OHOS_TARGET)
set(Rust_CARGO_TARGET_CACHED "${_RUST_OHOS_TARGET}" CACHE STRING "Target triple")
endif()
endif()
# Fallback to the default host target
if(NOT Rust_CARGO_TARGET_CACHED)
if(CMAKE_CROSSCOMPILING)
message(WARNING "CMake is in cross-compiling mode, but the cargo target-triple could not be inferred."
"Falling back to the default host target. Please consider manually setting `Rust_CARGO_TARGET`."
)
endif()
set(Rust_CARGO_TARGET_CACHED "${Rust_DEFAULT_HOST_TARGET}" CACHE STRING "Target triple")
endif()
message(STATUS "Rust Target: ${Rust_CARGO_TARGET_CACHED}")
endif()
if(Rust_CARGO_TARGET_CACHED STREQUAL Rust_DEFAULT_HOST_TARGET)
set(Rust_CROSSCOMPILING FALSE CACHE INTERNAL "Rust is configured for cross-compiling")
else()
set(Rust_CROSSCOMPILING TRUE CACHE INTERNAL "Rust is configured for cross-compiling")
endif()
_corrosion_parse_target_triple("${Rust_CARGO_TARGET_CACHED}" rust_arch rust_vendor rust_os rust_env)
_corrosion_parse_target_triple("${Rust_CARGO_HOST_TARGET_CACHED}" rust_host_arch rust_host_vendor rust_host_os rust_host_env)
set(Rust_CARGO_TARGET_ARCH "${rust_arch}" CACHE INTERNAL "Target architecture")
set(Rust_CARGO_TARGET_VENDOR "${rust_vendor}" CACHE INTERNAL "Target vendor")
set(Rust_CARGO_TARGET_OS "${rust_os}" CACHE INTERNAL "Target Operating System")
set(Rust_CARGO_TARGET_ENV "${rust_env}" CACHE INTERNAL "Target environment")
set(Rust_CARGO_HOST_ARCH "${rust_host_arch}" CACHE INTERNAL "Host architecture")
set(Rust_CARGO_HOST_VENDOR "${rust_host_vendor}" CACHE INTERNAL "Host vendor")
set(Rust_CARGO_HOST_OS "${rust_host_os}" CACHE INTERNAL "Host Operating System")
set(Rust_CARGO_HOST_ENV "${rust_host_env}" CACHE INTERNAL "Host environment")
if(NOT DEFINED CACHE{Rust_CARGO_TARGET_LINK_NATIVE_LIBS})
message(STATUS "Determining required link libraries for target ${Rust_CARGO_TARGET_CACHED}")
unset(required_native_libs)
_corrosion_determine_libs_new("${Rust_CARGO_TARGET_CACHED}" required_native_libs required_link_flags)
if(DEFINED required_native_libs)
message(STATUS "Required static libs for target ${Rust_CARGO_TARGET_CACHED}: ${required_native_libs}" )
endif()
if(DEFINED required_link_flags)
message(STATUS "Required link flags for target ${Rust_CARGO_TARGET_CACHED}: ${required_link_flags}" )
endif()
# In very recent corrosion versions it is possible to override the rust compiler version
# per target, so to be totally correct we would need to determine the libraries for
# every installed Rust version, that the user could choose from.
# In practice there aren't likely going to be any major differences, so we just do it once
# for the target and once for the host target (if cross-compiling).
set(Rust_CARGO_TARGET_LINK_NATIVE_LIBS "${required_native_libs}" CACHE INTERNAL
"Required native libraries when linking Rust static libraries")
set(Rust_CARGO_TARGET_LINK_OPTIONS "${required_link_flags}" CACHE INTERNAL
"Required link flags when linking Rust static libraries")
endif()
if(Rust_CROSSCOMPILING AND NOT DEFINED CACHE{Rust_CARGO_HOST_TARGET_LINK_NATIVE_LIBS})
message(STATUS "Determining required link libraries for target ${Rust_CARGO_HOST_TARGET_CACHED}")
unset(host_libs)
_corrosion_determine_libs_new("${Rust_CARGO_HOST_TARGET_CACHED}" host_libs host_flags)
if(DEFINED host_libs)
message(STATUS "Required static libs for host target ${Rust_CARGO_HOST_TARGET_CACHED}: ${host_libs}" )
endif()
set(Rust_CARGO_HOST_TARGET_LINK_NATIVE_LIBS "${host_libs}" CACHE INTERNAL
"Required native libraries when linking Rust static libraries for the host target")
set(Rust_CARGO_HOST_TARGET_LINK_OPTIONS "${host_flags}" CACHE INTERNAL
"Required linker flags when linking Rust static libraries for the host target")
endif()
# Set the input variables as non-cache variables so that the variables are available after
# `find_package`, even if the values were evaluated to defaults.
foreach(_VAR ${_Rust_USER_VARS})
set(${_VAR} "${${_VAR}_CACHED}")
# Ensure cached variables have type INTERNAL
set(${_VAR}_CACHED "${${_VAR}_CACHED}" CACHE INTERNAL "Internal cache of ${_VAR}")
endforeach()
find_package_handle_standard_args(
Rust
REQUIRED_VARS Rust_COMPILER Rust_VERSION Rust_CARGO Rust_CARGO_VERSION Rust_CARGO_TARGET Rust_CARGO_HOST_TARGET
VERSION_VAR Rust_VERSION
)
if(NOT TARGET Rust::Rustc)
add_executable(Rust::Rustc IMPORTED GLOBAL)
set_property(
TARGET Rust::Rustc
PROPERTY IMPORTED_LOCATION "${Rust_COMPILER_CACHED}"
)
add_executable(Rust::Cargo IMPORTED GLOBAL)
set_property(
TARGET Rust::Cargo
PROPERTY IMPORTED_LOCATION "${Rust_CARGO_CACHED}"
)
set(Rust_FOUND true)
endif()
list(POP_BACK CMAKE_MESSAGE_CONTEXT)