That's error coming from boost.context library build for assembly code.  Don't think there's arm64 support there for gcc -- seems like it's looking for clang.  Obviously if you're not using boost.context you can ignore.  Not seeing an issue for this, but maybe worthy of filing a report: https://github.com/boostorg/context/issues

libs/context/build/Jamfile.v2

# ARM64
# ARM64/AAPCS/ELF
alias asm_sources
   : asm/make_arm64_aapcs_elf_gas.S
     asm/jump_arm64_aapcs_elf_gas.S
     asm/ontop_arm64_aapcs_elf_gas.S
   : <abi>aapcs
     <address-model>64
     <architecture>arm
     <binary-format>elf
     <toolset>clang
   ;

alias asm_sources
   : asm/make_arm64_aapcs_elf_gas.S
     asm/jump_arm64_aapcs_elf_gas.S
     asm/ontop_arm64_aapcs_elf_gas.S
   : <abi>aapcs
     <address-model>64
     <architecture>arm
     <binary-format>elf
     <toolset>gcc
   ;

# ARM64/AAPCS/MACH-O
alias asm_sources
   : asm/make_arm64_aapcs_macho_gas.S
     asm/jump_arm64_aapcs_macho_gas.S
     asm/ontop_arm64_aapcs_macho_gas.S
   : <abi>aapcs
     <address-model>64
     <architecture>arm
     <binary-format>mach-o
     <toolset>clang
   ;

On Mon, Apr 20, 2020 at 6:44 AM Rahul Sreeram via Boost-users <boost-users@lists.boost.org> wrote:

Hi,

I am trying to build boost 1.72 with arm 64 bit compiler. I am seeing the error: No best alternative for libs/context/build/asm_sources

Although, after getting this error, compilation looks to succeed, but I am not sure if it did properly or not.

I have this line in the project-config.jam:

using gcc : arm : aarch64-fsl-linux-g++ --sysroot=/sysroots/aarch64-fsl-linux ;

After running b2, I get the following output:

./b2 toolset=gcc-arm
Performing configuration checks

    - default address-model    : 64-bit
    - default architecture     : arm

Building the Boost C++ Libraries.


error: No best alternative for libs/context/build/asm_sources
    next alternative: required properties: <abi>aapcs <address-model>32 <architecture>arm <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>aapcs <address-model>32 <architecture>arm <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>aapcs <address-model>32 <architecture>arm <binary-format>elf <threading>multi <toolset>qcc
        not matched
    next alternative: required properties: <abi>aapcs <address-model>32 <architecture>arm <binary-format>mach-o <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>aapcs <address-model>32 <architecture>arm <binary-format>mach-o <threading>multi <toolset>darwin
        not matched
    next alternative: required properties: <abi>aapcs <address-model>32 <architecture>arm <binary-format>pe <threading>multi <toolset>msvc
        not matched
    next alternative: required properties: <abi>aapcs <address-model>64 <architecture>arm <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>aapcs <address-model>64 <architecture>arm <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>aapcs <address-model>64 <architecture>arm <binary-format>mach-o <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>aapcs <address-model>64 <architecture>arm <binary-format>mach-o <threading>multi <toolset>darwin
        not matched

    next alternative: required properties: <abi>o32 <address-model>32 <architecture>mips1 <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>o32 <address-model>32 <architecture>mips1 <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>n64 <address-model>64 <architecture>mips1 <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>n64 <address-model>64 <architecture>mips1 <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>power <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>power <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>power <binary-format>mach-o <threading>multi <toolset>darwin
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>power <binary-format>xcoff <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>power <binary-format>xcoff <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>power <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>power <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>power <binary-format>mach-o <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>power <binary-format>mach-o <threading>multi <toolset>darwin
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>power <binary-format>xcoff <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>power <binary-format>xcoff <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>32_64 <architecture>power <binary-format>mach-o <threading>multi
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>riscv <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>s390x <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>x86 <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>x86 <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>x86 <binary-format>elf <threading>multi <toolset>intel
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>x86 <binary-format>mach-o <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>32 <architecture>x86 <binary-format>mach-o <threading>multi <toolset>darwin
        not matched
    next alternative: required properties: <abi>ms <address-model>32 <architecture>x86 <binary-format>pe <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>ms <address-model>32 <architecture>x86 <binary-format>pe <threading>multi <toolset>clang-win
        not matched
    next alternative: required properties: <abi>ms <address-model>32 <architecture>x86 <binary-format>pe <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>ms <address-model>32 <architecture>x86 <binary-format>pe <threading>multi <toolset>intel
        not matched
    next alternative: required properties: <abi>ms <address-model>32 <architecture>x86 <binary-format>pe <threading>multi <toolset>msvc
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>x86 <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>x86 <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>x86 <binary-format>elf <threading>multi <toolset>intel
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>x86 <binary-format>mach-o <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>x86 <binary-format>mach-o <threading>multi <toolset>darwin
        not matched
    next alternative: required properties: <abi>sysv <address-model>64 <architecture>x86 <binary-format>mach-o <threading>multi <toolset>intel
        not matched
    next alternative: required properties: <abi>ms <address-model>64 <architecture>x86 <binary-format>pe <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>ms <address-model>64 <architecture>x86 <binary-format>pe <threading>multi <toolset>clang-win
        not matched
    next alternative: required properties: <abi>ms <address-model>64 <architecture>x86 <binary-format>pe <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>ms <address-model>64 <architecture>x86 <binary-format>pe <threading>multi <toolset>intel
        not matched
    next alternative: required properties: <abi>ms <address-model>64 <architecture>x86 <binary-format>pe <threading>multi <toolset>msvc
        not matched
    next alternative: required properties: <abi>x32 <address-model>64 <architecture>x86 <binary-format>elf <threading>multi <toolset>clang
        not matched
    next alternative: required properties: <abi>x32 <address-model>64 <architecture>x86 <binary-format>elf <threading>multi <toolset>gcc
        not matched
    next alternative: required properties: <abi>x32 <address-model>64 <architecture>x86 <binary-format>elf <threading>multi <toolset>intel
        not matched
    next alternative: required properties: <abi>sysv <address-model>32_64 <architecture>x86 <binary-format>mach-o <threading>multi
        not matched
    next alternative: required properties: <abi>sysv <architecture>combined <binary-format>mach-o <threading>multi
        not matched
    - C++11 mutex              : yes
    - lockfree boost::atomic_flag : yes
    - Boost.Config Feature Check: cxx11_auto_declarations : yes
    - Boost.Config Feature Check: cxx11_constexpr : yes
    - Boost.Config Feature Check: cxx11_defaulted_functions : yes
    - Boost.Config Feature Check: cxx11_final : yes
    - Boost.Config Feature Check: cxx11_hdr_mutex : yes
    - Boost.Config Feature Check: cxx11_hdr_tuple : yes
    - Boost.Config Feature Check: cxx11_lambdas : yes
    - Boost.Config Feature Check: cxx11_noexcept : yes

......

Regards,
Rahul

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