Re: [Boost-users] building on OS X with custom gcc version

Subject: Re: [Boost-users] building on OS X with custom gcc version
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2018-06-25 01:02:20

AMDG

On 06/24/2018 01:32 PM, Damien Hocking via Boost-users wrote:
> 
>> On Jun 24, 2018, at 11:22 AM, Steven Watanabe via Boost-users <boost-users_at_[hidden]> wrote:
>>
>> On 06/24/2018 09:16 AM, Damien Hocking via Boost-users wrote:
>>> I’m trying to get 1.65.1 compiled on OSX 10.13.5.  I have gcc 8.1 installed and I’ve added it to user-config.jam in the home directory.  When I run "bootstrap.sh —with-toolset=gcc" it uses the Darwin gcc toolset, if I try —with-toolset=gcc-8.1 I get an unknown toolset error.
>>>
>>> If I use the Darwin-based gcc version of b2 and try and build with gcc 8.1 I get this series of errors: 
>>>
>>> error: No best alternative for libs/context/build/asm_sources.  
>>>
>>
>>  Can you post the rest of the error?
>> It should give a list of which alternatives
>> matched or didn't match.
> 
> Thanks for the fast response.  
> 
> This is the full list:
> 
> <snip>

Okay.  I see what's going on here.  Boost.Context
only supports darwin and clang on OSX.

You can work around the issue by finding this
in libs/context/build/Jamfile.v2:

# X86_64/SYSV/MACH-O
alias asm_sources
   : asm/make_x86_64_sysv_macho_gas.S
     asm/jump_x86_64_sysv_macho_gas.S
     asm/ontop_x86_64_sysv_macho_gas.S
   : <abi>sysv
     <address-model>64
     <architecture>x86
     <binary-format>mach-o
     <toolset>clang
   ;

and making a copy, replacing clang with gcc.

>>
>>> and also linker errors from an unknown option -h on ld.  I’m assuming this is because b2 built with Darwin gcc doesn’t have the right options for gcc 8.  Is there a way to force b2 to be built based on gcc 8 so it gets the assembly and linker options right?  
>>>
>> <snip>
>>
> Any idea what the ld unknown option: -h comes from?
> 

You may need to set <linker-type>darwin in the toolset
initialization.  The relevant code was significantly
rewritten and it should work automatically in 1.67
(1.66 has significant problems on darwin, and I don't
recommend using it.)

In Christ,
Steven Watanabe