Re: [Boost-build] b2 - what does this message mean? "error: No best alternative for"

Subject: Re: [Boost-build] b2 - what does this message mean? "error: No best alternative for"
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2019-04-03 16:51:34

AMDG

On 4/3/19 10:43 AM, Paul A. Bristow wrote:
> 
> 
>> -----Original Message-----
>> From: Steven Watanabe [mailto:watanabesj_at_[hidden]]
>> Sent: 02 April 2019 15:12
>> <snip>
>>
>> run hello_boost_chrono_library.cpp
>>   : name hello_boost_chrono_library_prebuilt

This should say `target-name` instead of `name`

>>   ;
> 
> 
> 
> I'm sure this is the cause, but despite some fumbling experiments, I could not find an incantation that works.
> 
> 4.5 testing
> 
> test rule. The run rule has the following signature:
> 
> rule run ( sources + : args * : input-files * : requirements * : target-name ?     : default-build * )
> 
> which is different from the 'common rule format' used by other examples
> 
>  lib filesystem : : <name>libfilesystem
> 
> So I expected it to be this
> 
> # To build both ways in same jamfile here, must name explicitly different 
> # or target name would be ambiguous with default implicit name of source file.
> 
> run 
>   hello_boost_chrono_library.cpp  # Source(s)
> : # Args *
> : # Input files *
> : # Requirements *
> : # Target name
>   <name>hello_boost_chrono_library_pre-built      # Explicit run target name. 

Leave off the <name> and it should work.

> ; # Use pre-built library.
> 
> But I'm obviously still too stupid to understand bjam ☹
> 
> Suggestions welcome.
> 

In Christ,
Steven Watanabe