[package] boost/1.81.0: b2 not found when cross-compiling

[jwillikers]

Description

When cross-compiling Boost on x86_64 to arm64, the b2 executable is not found by the recipe and the build fails.

Package and Environment Details

• Package Name/Version: boost/1.81.0
• Operating System+version: Yocto
• Compiler+version: GCC 11
• Conan version: conan 1.57.0
• Python version: Python 3.11.1

Conan profile

Configuration for profile yocto/debug:

[settings]
os=Linux
arch=armv8
compiler=gcc
compiler.version=11
compiler.libcxx=libstdc++11
compiler.cppstd=20
build_type=Debug
[options]
boost:extra_b2_flags=cxxstd=20 compileflags=-march=armv8-a+crc+crypto compileflags=-mtune=cortex-a35 compileflags=--sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
[conf]
tools.build:cflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a35']
tools.build:compiler_executables={'asm': 'aarch64-mycompany-linux-as', 'c': 'aarch64-mycompany-linux-gcc', 'cpp': 'aarch64-mycompany-linux-g++'}
tools.build:cxxflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a35']
tools.build:exelinkflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a35']
tools.build:sharedlinkflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a35']
tools.build:sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
tools.cmake.cmaketoolchain:system_processor=aarch64
tools.cmake.cmaketoolchain:user_toolchain=['/var/home/jordan/.conan/toolchains/yocto.cmake']
[env]
PATH=["'/usr/local/mycompany-sdk/sysroots/x86_64-mycompany-linux/sysroots/x86_64-mycompany-linux/usr/bin/aarch64-mycompany-linux'"]
CONAN_CMAKE_TOOLCHAIN_FILE=['"/var/home/jordan/.conan/toolchains/yocto.cmake"']
CC=aarch64-mycompany-linux-gcc -march=armv8-a+crc+crypto -mtune=cortex-a35 --sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
CXX=aarch64-mycompany-linux-g++ -march=armv8-a+crc+crypto -mtune=cortex-a35 --sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
CPP=aarch64-mycompany-linux-gcc -E -march=armv8-a+crc+crypto -mtune=cortex-a35 --sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
AS=aarch64-mycompany-linux-as
LD=aarch64-mycompany-linux-ld -march=armv8-a+crc+crypto -mtune=cortex-a35 --sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
GDB=aarch64-mycompany-linux-gdb
STRIP=aarch64-mycompany-linux-strip
RANLIB=aarch64-mycompany-linux-ranlib
OBJCOPY=aarch64-mycompany-linux-objcopy
OBJDUMP=aarch64-mycompany-linux-objdump
AR=aarch64-mycompany-linux-ar
NM=aarch64-mycompany-linux-nm
M4=m4
TARGET_PREFIX=aarch64-mycompany-linux-
ARCH=arm64
CONFIGURE_FLAGS=--target=aarch64-mycompany-linux --host=aarch64-mycompany-linux --build=x86_64-linux --with-libtool-sysroot=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
OE_CMAKE_TOOLCHAIN_FILE=/usr/local/mycompany-sdk/sysroots/x86_64-mycompany-linux/usr/share/cmake/OEToolchainConfig.cmake
OE_CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX=echo lib | sed -e s/lib//
PKG_CONFIG_SYSROOT_MAP=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux
PKG_CONFIG_PATH=/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux/usr/lib/pkgconfig:/usr/local/mycompany-sdk/sysroots/cortexa35-mycompany-linux/usr/share/pkgconfig
CONFIG_SITE=/usr/local/mycompany-sdk/site-config-cortexa35-mycompany-linux
OECORE_TARGET_ARCH=aarch64
OECORE_TARGET_OS=linux

Steps to reproduce

cd recipes/boost/all
conan create . boost/1.81.0@ -pr yocto/debug -u -b outdated -b cascade -o:h 'boost/*:without_stacktrace=True'

Logs

Click to expand log

[HOOK - conan-center.py] pre_export(): [DEPRECATED GLOBAL CPPSTD (KB-H001)] OK
[HOOK - conan-center.py] pre_export(): [REFERENCE LOWERCASE (KB-H002)] OK
[HOOK - conan-center.py] pre_export(): [RECIPE METADATA (KB-H003)] OK
[HOOK - conan-center.py] pre_export(): [HEADER_ONLY, NO COPY SOURCE (KB-H005)] OK
[HOOK - conan-center.py] pre_export(): [FPIC OPTION (KB-H006)] OK
[HOOK - conan-center.py] pre_export(): [VERSION RANGES (KB-H008)] OK
[HOOK - conan-center.py] pre_export(): [RECIPE FOLDER SIZE (KB-H009)] Total recipe size: 250.4345703125 KB
[HOOK - conan-center.py] pre_export(): [RECIPE FOLDER SIZE (KB-H009)] OK
[HOOK - conan-center.py] pre_export(): [EXPORT LICENSE (KB-H023)] exports: None
[HOOK - conan-center.py] pre_export(): [EXPORT LICENSE (KB-H023)] exports: None
[HOOK - conan-center.py] pre_export(): [EXPORT LICENSE (KB-H023)] OK
[HOOK - conan-center.py] pre_export(): [TEST PACKAGE FOLDER (KB-H024)] OK
[HOOK - conan-center.py] pre_export(): [META LINES (KB-H025)] OK
[HOOK - conan-center.py] pre_export(): [CONAN CENTER INDEX URL (KB-H027)] OK
[HOOK - conan-center.py] pre_export(): [CMAKE MINIMUM VERSION (KB-H028)] OK
[HOOK - conan-center.py] pre_export(): [TEST PACKAGE - RUN ENVIRONMENT (KB-H029)] OK
[HOOK - conan-center.py] pre_export(): [SYSTEM REQUIREMENTS (KB-H032)] OK
[HOOK - conan-center.py] pre_export(): [CONANDATA.YML FORMAT (KB-H030)] OK
[HOOK - conan-center.py] pre_export(): [TEST PACKAGE - NO IMPORTS() (KB-H034)] OK
[HOOK - conan-center.py] pre_export(): [NO AUTHOR (KB-H037)] OK
[HOOK - conan-center.py] pre_export(): [NOT ALLOWED ATTRIBUTES (KB-H039)] OK
[HOOK - conan-center.py] pre_export(): [NO TARGET NAME (KB-H040)] OK
[HOOK - conan-center.py] pre_export(): [NO FINAL ENDLINE (KB-H041)] OK
[HOOK - conan-center.py] pre_export(): [NO REQUIRES.ADD() (KB-H044)] OK
[HOOK - conan-center.py] pre_export(): [DELETE OPTIONS (KB-H045)] OK
[HOOK - conan-center.py] pre_export(): [CMAKE VERBOSE MAKEFILE (KB-H046)] OK
[HOOK - conan-center.py] pre_export(): [CMAKE VERSION REQUIRED (KB-H048)] OK
[HOOK - conan-center.py] pre_export(): [CMAKE WINDOWS EXPORT ALL SYMBOLS (KB-H049)] OK
[HOOK - conan-center.py] pre_export(): [DEFAULT OPTIONS AS DICTIONARY (KB-H051)] OK
[HOOK - conan-center.py] pre_export(): [CONFIG.YML HAS NEW VERSION (KB-H052)] OK
[HOOK - conan-center.py] pre_export(): [PRIVATE IMPORTS (KB-H053)] OK
[HOOK - conan-center.py] pre_export(): [SINGLE REQUIRES (KB-H055)] OK
[HOOK - conan-center.py] pre_export(): [TOOLS RENAME (KB-H057)] OK
[HOOK - conan-center.py] pre_export(): [ILLEGAL CHARACTERS (KB-H058)] OK
[HOOK - conan-center.py] pre_export(): [CLASS NAME (KB-H059)] OK
[HOOK - conan-center.py] pre_export(): [NO CRLF (KB-H060)] OK
[HOOK - conan-center.py] pre_export(): [NO BUILD SYSTEM FUNCTIONS (KB-H061)] OK
[HOOK - conan-center.py] pre_export(): [TOOLS CROSS BUILDING (KB-H062)] OK
[HOOK - conan-center.py] pre_export(): [INVALID TOPICS (KB-H064)] OK
[HOOK - conan-center.py] pre_export(): [NO REQUIRED_CONAN_VERSION (KB-H065)] OK
[HOOK - conan-center.py] pre_export(): [TEST_TYPE MANAGEMENT (KB-H068)] OK
[HOOK - conan-center.py] pre_export(): [TEST PACKAGE - NO DEFAULT OPTIONS (KB-H069)] OK
[HOOK - conan-center.py] pre_export(): [MANDATORY SETTINGS (KB-H070)] OK
[HOOK - conan-center.py] pre_export(): [PYLINT EXECUTION (KB-H072)] OK
[HOOK - conan-center.py] pre_export(): [TEST V1 PACKAGE FOLDER (KB-H073)] OK
[HOOK - conan-center.py] pre_export(): [REQUIREMENT OVERRIDE PARAMETER (KB-H075)] OK
Exporting package recipe
boost/1.81.0 exports: File 'conandata.yml' found. Exporting it...
boost/1.81.0 exports: Copied 1 '.yml' file: conandata.yml
boost/1.81.0: Calling export()
boost/1.81.0: Copied 1 '.yml' file: dependencies-1.81.0.yml
boost/1.81.0: Calling export_sources()
[HOOK - conan-center.py] post_export(): [CONANDATA.YML REDUCE (KB-H031)] Saving conandata.yml: {'sources': {'1.81.0': {'url': ['https://boostorg.jfrog.io/artifactory/main/release/1.81.0/source/boost_1_81_0.tar.bz2', 'https://sourceforge.net/projects/boost/files/boost/1.81.0/boost_1_81_0.tar.bz2'], 'sha256': '71feeed900fbccca04a3b4f2f84a7c217186f28a940ed8b7ed4725986baf99fa'}}, 'patches': {'1.81.0': [{'patch_file': 'patches/boost_1_77_mpi_check.patch', 'patch_description': 'Fails the build when mpi is not configured', 'patch_type': 'conan'}, {'patch_file': 'patches/1.81.0-locale-fail-on-missing-backend.patch', 'patch_description': 'Fails the build when there is no iconv backend', 'patch_type': 'conan'}]}}
[HOOK - conan-center.py] post_export(): [CONANDATA.YML REDUCE (KB-H031)] New conandata.yml contents: patches:
  1.81.0:
  - patch_description: Fails the build when mpi is not configured
    patch_file: patches/boost_1_77_mpi_check.patch
    patch_type: conan
  - patch_description: Fails the build when there is no iconv backend
    patch_file: patches/1.81.0-locale-fail-on-missing-backend.patch
    patch_type: conan
sources:
  1.81.0:
    sha256: 71feeed900fbccca04a3b4f2f84a7c217186f28a940ed8b7ed4725986baf99fa
    url:
    - https://boostorg.jfrog.io/artifactory/main/release/1.81.0/source/boost_1_81_0.tar.bz2
    - https://sourceforge.net/projects/boost/files/boost/1.81.0/boost_1_81_0.tar.bz2

[HOOK - conan-center.py] post_export(): [CONANDATA.YML REDUCE (KB-H031)] OK
[HOOK - conan-center.py] post_export(): [DEFAULT SHARED OPTION VALUE (KB-H050)] OK
[HOOK - conan-center.py] post_export(): [LICENSE PUBLIC DOMAIN (KB-H056)] OK
boost/1.81.0: The stored package has not changed
boost/1.81.0: Using the exported files summary hash as the recipe revision: 0aca3d1f3a8d8b2f46886c7c26da599d 
boost/1.81.0: Exported revision: 0aca3d1f3a8d8b2f46886c7c26da599d
Configuration (profile_host):
[settings]
arch=armv8
arch.extensions=crc+crypto
arch.processor=cortex-a72.cortex-a53
build_type=Debug
compiler=gcc
compiler.cppstd=20
compiler.libcxx=libstdc++11
compiler.version=11
os=Linux
[options]
boost:extra_b2_flags=cxxstd=20 compileflags=-march=armv8-a+crc+crypto compileflags=-mtune=cortex-a72.cortex-a53 compileflags=--sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
boost:without_stacktrace=True
[build_requires]
[env]
AR=aarch64-mycompany-linux-ar
ARCH=arm64
AS=aarch64-mycompany-linux-as
CC=aarch64-mycompany-linux-gcc -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
CONAN_CMAKE_TOOLCHAIN_FILE=["/var/home/jordan/.conan/toolchains/yocto.cmake"]
CONFIGURE_FLAGS=--target=aarch64-mycompany-linux --host=aarch64-mycompany-linux --build=x86_64-linux --with-libtool-sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
CONFIG_SITE=/usr/local/mycompany-raptor-sdk/site-config-cortexa72-cortexa53-crypto-mycompany-linux
CPP=aarch64-mycompany-linux-gcc -E -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
CXX=aarch64-mycompany-linux-g++ -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
GDB=aarch64-mycompany-linux-gdb
LD=aarch64-mycompany-linux-ld -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
M4=m4
NM=aarch64-mycompany-linux-nm
OBJCOPY=aarch64-mycompany-linux-objcopy
OBJDUMP=aarch64-mycompany-linux-objdump
OECORE_TARGET_ARCH=aarch64
OECORE_TARGET_OS=linux
OE_CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX=`echo lib | sed -e s/lib//`
OE_CMAKE_TOOLCHAIN_FILE=/usr/local/mycompany-raptor-sdk/sysroots/x86_64-mycompany-linux/usr/share/cmake/OEToolchainConfig.cmake
PATH=['/usr/local/mycompany-raptor-sdk/sysroots/x86_64-mycompany-linux/sysroots/x86_64-mycompany-linux/usr/bin/aarch64-mycompany-linux']
PKG_CONFIG_PATH=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux/usr/lib/pkgconfig:/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux/usr/share/pkgconfig
PKG_CONFIG_SYSROOT_MAP=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
RANLIB=aarch64-mycompany-linux-ranlib
STRIP=aarch64-mycompany-linux-strip
TARGET_PREFIX=aarch64-mycompany-linux-
[conf]
tools.env.virtualenv:auto_use=True
tools.cmake.cmake_layout:build_folder_vars=['settings.arch', 'settings.compiler', 'options.platform', 'options.shared']
tools.cmake.cmaketoolchain:find_package_prefer_config=True
tools.cmake.cmaketoolchain:generator=Ninja
tools.system.package_manager:mode=install
tools.system.package_manager:sudo=True
tools.build:compiler_executables={'asm': 'aarch64-mycompany-linux-as', 'c': 'aarch64-mycompany-linux-gcc', 'cpp': 'aarch64-mycompany-linux-g++'}
tools.build:cflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a72.cortex-a53']
tools.build:cxxflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a72.cortex-a53']
tools.build:exelinkflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a72.cortex-a53']
tools.build:sharedlinkflags=['-march=armv8-a+crc+crypto', '-mtune=cortex-a72.cortex-a53']
tools.build:sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
tools.cmake.cmaketoolchain:system_processor=aarch64
tools.cmake.cmaketoolchain:user_toolchain=['/var/home/jordan/.conan/toolchains/yocto.cmake']
[buildenv]
PATH=['/usr/local/mycompany-raptor-sdk/sysroots/x86_64-mycompany-linux/sysroots/x86_64-mycompany-linux/usr/bin/aarch64-mycompany-linux']
CONAN_CMAKE_TOOLCHAIN_FILE=["/var/home/jordan/.conan/toolchains/yocto.cmake"]
CC=aarch64-mycompany-linux-gcc -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
CXX=aarch64-mycompany-linux-g++ -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
CPP=aarch64-mycompany-linux-gcc -E -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
AS=aarch64-mycompany-linux-as
LD=aarch64-mycompany-linux-ld -march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53 --sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
GDB=aarch64-mycompany-linux-gdb
STRIP=aarch64-mycompany-linux-strip
RANLIB=aarch64-mycompany-linux-ranlib
OBJCOPY=aarch64-mycompany-linux-objcopy
OBJDUMP=aarch64-mycompany-linux-objdump
AR=aarch64-mycompany-linux-ar
NM=aarch64-mycompany-linux-nm
M4=m4
TARGET_PREFIX=aarch64-mycompany-linux-
ARCH=arm64
CONFIGURE_FLAGS=--target=aarch64-mycompany-linux --host=aarch64-mycompany-linux --build=x86_64-linux --with-libtool-sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
OE_CMAKE_TOOLCHAIN_FILE=/usr/local/mycompany-raptor-sdk/sysroots/x86_64-mycompany-linux/usr/share/cmake/OEToolchainConfig.cmake
OE_CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX="`echo lib | sed -e s/lib//`"
PKG_CONFIG_SYSROOT_MAP=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux
PKG_CONFIG_PATH=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux/usr/lib/pkgconfig:/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux/usr/share/pkgconfig
CONFIG_SITE=/usr/local/mycompany-raptor-sdk/site-config-cortexa72-cortexa53-crypto-mycompany-linux
OECORE_TARGET_ARCH="aarch64"
OECORE_TARGET_OS="linux"

Configuration (profile_build):
[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=20
compiler.libcxx=libstdc++11
compiler.version=12
os=Linux
[options]
[build_requires]
[env]
[conf]
tools.env.virtualenv:auto_use=True
tools.cmake.cmake_layout:build_folder_vars=['settings.arch', 'settings.compiler', 'options.platform', 'options.shared']
tools.cmake.cmaketoolchain:find_package_prefer_config=True
tools.cmake.cmaketoolchain:generator=Ninja
tools.system.package_manager:mode=install
tools.system.package_manager:sudo=True

bzip2/1.0.8: WARN: Can't update, no package in remote
bzip2/1.0.8: Package is up to date
zlib/1.2.13: Package is up to date
b2/4.9.3: Package is up to date
boost/1.81.0 (test package): Installing package
Requirements
    boost/1.81.0 from 'conancenter' - Cache
    bzip2/1.0.8 from 'conancenter' - Cache
    zlib/1.2.13 from 'conancenter' - Cache
Packages
    boost/1.81.0:85cad237076e3f94b582831a58d4b5bef1773758 - Build
    bzip2/1.0.8:031c7e2b156578299e5c115231e8a9b01c67dd2a - Cache
    zlib/1.2.13:7d573acb8003126c25d1f362d807e5549ec62799 - Cache
Build requirements
    b2/4.9.3 from 'conancenter' - Cache
Build requirements packages
    b2/4.9.3:4db1be536558d833e52e862fd84d64d75c2b3656 - Cache

Cross-build from 'Linux:x86_64' to 'Linux:armv8'
Installing (downloading, building) binaries...
b2/4.9.3: Already installed!
bzip2/1.0.8: Already installed!
zlib/1.2.13: Already installed!
boost/1.81.0: Applying build-requirement: b2/4.9.3
boost/1.81.0: Building your package in /var/home/jordan/.conan/data/boost/1.81.0/_/_/build/85cad237076e3f94b582831a58d4b5bef1773758
boost/1.81.0: Generator txt created conanbuildinfo.txt
boost/1.81.0: Calling generate()
boost/1.81.0: Aggregating env generators
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK. 'fPIC' option found and apparently well managed
[HOOK - conan-center.py] pre_build(): [FPIC MANAGEMENT (KB-H007)] OK
boost/1.81.0: Calling build()
boost/1.81.0: WARN: replace_in_file didn't find pattern '$(>) > $(<)' in '/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/libs/stacktrace/build/Jamfile.v2' file.
boost/1.81.0: WARN: replace_in_file didn't find pattern '/* thread_local */' in '/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/boost/stacktrace/detail/libbacktrace_impls.hpp' file.
boost/1.81.0: WARN: replace_in_file didn't find pattern '/* static __thread */' in '/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/boost/stacktrace/detail/libbacktrace_impls.hpp' file.
boost/1.81.0: WARN: replace_in_file didn't find pattern 'local generic-os = [ set.difference $(all-os) : aix darwin vxworks solaris osf hpux ] ;' in '/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/tools/build/src/tools/gcc.jam' file.
boost/1.81.0: WARN: replace_in_file didn't find pattern 'local no-threading = android beos haiku sgi darwin vxworks ;' in '/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/tools/build/src/tools/gcc.jam' file.
boost/1.81.0: WARN: replace_in_file didn't /notificationsfind pattern '    <conditional>@numa' in '/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/libs/fiber/build/Jamfile.v2' file.
boost/1.81.0: WARN: Patching user-config.jam
boost/1.81.0: WARN: 
using zlib : 1.2.13 : <include>"/var/home/jordan/.conan/data/zlib/1.2.13/_/_/package/7d573acb8003126c25d1f362d807e5549ec62799/include" <search>"/var/home/jordan/.conan/data/zlib/1.2.13/_/_/package/7d573acb8003126c25d1f362d807e5549ec62799/lib" <name>z ;
using bzip2 : 1.0.8 : <include>"/var/home/jordan/.conan/data/bzip2/1.0.8/_/_/package/031c7e2b156578299e5c115231e8a9b01c67dd2a/include" <search>"/var/home/jordan/.conan/data/bzip2/1.0.8/_/_/package/031c7e2b156578299e5c115231e8a9b01c67dd2a/lib" <name>bz2 ;
using "gcc" :  :  "aarch64-mycompany-linux-g++" : 
<archiver>"aarch64-mycompany-linux-ar" <ranlib>"aarch64-mycompany-linux-ranlib" <cxxflags>"-march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53" <cflags>"-march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53" <linkflags>"-march=armv8-a+crc+crypto -mtune=cortex-a72.cortex-a53"  ;
boost/1.81.0: Cross building, detecting compiler...
boost/1.81.0: Cross building flags: []
boost/1.81.0: WARN: b2 -q numa=on target-os=linux architecture=arm address-model=64 binary-format=elf abi=aapcs --layout=system --user-config=/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/tools/build/user-config.jam -sNO_ZLIB=0 -sNO_BZIP2=0 -sNO_LZMA=1 -sNO_ZSTD=1 boost.locale.icu=off --disable-icu boost.locale.iconv=on boost.locale.iconv.lib=libc threading=multi visibility=hidden link=static variant=debug --with-atomic --with-chrono --with-container --with-context --with-contract --with-coroutine --with-date_time --with-exception --with-fiber --with-filesystem --with-graph --with-iostreams --with-json --with-locale --with-log --with-math --with-nowide --with-program_options --with-random --with-regex --with-serialization --with-system --with-test --with-thread --with-timer --with-type_erasure --with-url --with-wave toolset=gcc cxxflags=-std=c++2a define=_GLIBCXX_USE_CXX11_ABI=1 pch=on linkflags="" cxxflags="-fPIC" cxxstd=20 compileflags=-march=armv8-a+crc+crypto compileflags=-mtune=cortex-a72.cortex-a53 compileflags=--sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux install --prefix=/var/home/jordan/.conan/data/boost/1.81.0/_/_/package/85cad237076e3f94b582831a58d4b5bef1773758 -j12 --abbreviate-paths -d0 --debug-configuration --build-dir="/var/home/jordan/.conan/data/boost/1.81.0/_/_/build/85cad237076e3f94b582831a58d4b5bef1773758/build-debug"
/bin/sh: line 1: b2: command not found
boost/1.81.0: 
boost/1.81.0: ERROR: Package '85cad237076e3f94b582831a58d4b5bef1773758' build failed
boost/1.81.0: WARN: Build folder /var/home/jordan/.conan/data/boost/1.81.0/_/_/build/85cad237076e3f94b582831a58d4b5bef1773758/build-debug
ERROR: boost/1.81.0: Error in build() method, line 872
	self.run(full_command)
	ConanException: Error 127 while executing b2 -q numa=on target-os=linux architecture=arm address-model=64 binary-format=elf abi=aapcs --layout=system --user-config=/var/home/jordan/.conan/data/boost/1.81.0/_/_/source/src/tools/build/user-config.jam -sNO_ZLIB=0 -sNO_BZIP2=0 -sNO_LZMA=1 -sNO_ZSTD=1 boost.locale.icu=off --disable-icu boost.locale.iconv=on boost.locale.iconv.lib=libc threading=multi visibility=hidden link=static variant=debug --with-atomic --with-chrono --with-container --with-context --with-contract --with-coroutine --with-date_time --with-exception --with-fiber --with-filesystem --with-graph --with-iostreams --with-json --with-locale --with-log --with-math --with-nowide --with-program_options --with-random --with-regex --with-serialization --with-system --with-test --with-thread --with-timer --with-type_erasure --with-url --with-wave toolset=gcc cxxflags=-std=c++2a define=_GLIBCXX_USE_CXX11_ABI=1 pch=on linkflags="" cxxflags="-fPIC" cxxstd=20 compileflags=-march=armv8-a+crc+crypto compileflags=-mtune=cortex-a72.cortex-a53 compileflags=--sysroot=/usr/local/mycompany-raptor-sdk/sysroots/cortexa72-cortexa53-crypto-mycompany-linux install --prefix=/var/home/jordan/.conan/data/boost/1.81.0/_/_/package/85cad237076e3f94b582831a58d4b5bef1773758 -j12 --abbreviate-paths -d0 --debug-configuration --build-dir="/var/home/jordan/.conan/data/boost/1.81.0/_/_/build/85cad237076e3f94b582831a58d4b5bef1773758/build-debug"

[coofercat]

FWIW, I have the same with boost/1.79, and haven't found a solution. #14767 talks about duplicating the [env] to [buildenv] which didn't work in my case. I can't be 100% certain, but I think the b2 problem started around the time of the recipe changes that #14767 talks about - certainly, we had to fix our builds around that time because of those recipe changes, and have had to do direct-compile our aarch64 conan packages to solve the 'b2' problem since then.

If it matters, my profile settings are a lot simpler than above:

target_host=aarch64-none-linux-gnu # also tried aarch64-linux-gnu
standalone_toolchain=/toolchain/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu
# also tried toolchain=/usr/aarch64-linux/gnu using standard Ubuntu apt packages
cc_compiler=gcc
cxx_compiler=g++

[env]
CONAN_CMAKE_FIND_ROOT_PATH=$standalone_toolchain
PATH=[$standalone_toolchain/bin]
CHOST=$target_host
AR=$target_host-ar
AS=$target_host-as
RANLIB=$target_host-ranlib
LD=$target_host-ld
STRIP=$target_host-strip
CC=$target_host-$cc_compiler
CXX=$target_host-$cxx_compiler

[buildenv]
CONAN_CMAKE_FIND_ROOT_PATH=$standalone_toolchain
PATH=[$standalone_toolchain/bin]
CHOST=$target_host
AR=$target_host-ar
AS=$target_host-as
RANLIB=$target_host-ranlib
LD=$target_host-ld
STRIP=$target_host-strip
CC=$target_host-$cc_compiler
CXX=$target_host-$cxx_compiler

[settings]
os=Linux
arch=armv8
compiler=gcc
compiler.version=9
compiler.libcxx=libstdc++11
build_type=Debug

I would really appreciate any help figuring out a way to solve this problem - right now we're direct-compiling our conan packages on Arm and then passing a tarball around to use on laptops/CI to cross-compile our application.

[jwillikers]

I figured out at least the first part where b2 isn't found. My PATH variable was getting put together all wrong because it wasn't using the correct syntax. I had to use the following to configure PATH in the buildenv section.

[buildenv]
PATH=+(path)/path/to/cross-compiler/bin

You can use =+ to prepend or += to append.

Of course, Boost still doesn't cross-compile for me, but that must be due to something else.