Re: [Boost-build] MATCH regular expression question.

Subject: Re: [Boost-build] MATCH regular expression question.
From: Aparna Kumta (aparna.kumta_at_[hidden])
Date: 2015-11-09 13:45:38

On 11/08/15 13:25, Steven Watanabe wrote:
> AMDG
>
> On 11/06/2015 02:37 PM, Aparna Kumta wrote:
>> On 11/06/15 13:29, Steven Watanabe wrote:
>>> On 11/06/2015 02:22 PM, Aparna Kumta wrote:
>>>> actions link.dll bind LIBRARIES
>>>> {
>>>>      if [ MATCH "(std)" : $(OPTIONS) ]
>>>>      {
>>> You can't use MATCH inside an action block.
>>> The body is literal text passed to the
>>> shell.  The only processing that Boost.Build
>>> does is variable expansion.
>> Can MATCH be used outside the action block as follows?
>>
> This is syntactically correct, but doesn't
> do what you want.  (OPTIONS is not defined
> at file scope.)
Thanks! I did try to echo 'OPTIONS' and saw that as well.
> I would suggest putting
> this logic inside a forwarding rule:
>
> rule link.dll ( targets * : sources * : properties * )
> {
>    if [ MATCH "(std)" : [ on $(targets) return $(OPTIONS) ] ]
>    {
>      link.dll.std $(targets) : $(sources) ;
>    }
> }
>
> actions link.dll.std bind LIBRARIES
> {
>    ...
> }
>
> Actually, looking at your original problem,
> there's no need for separate action blocks:
>
> rule link.dll ( targets * : sources * : properties * )
> {
>    if [ MATCH "(std)" : [ on $(targets) return $(OPTIONS) ]
>    {
>      STDLIBOPT on $(targets) = -library=stdcpp,CrunG3 ;
>    }
> }
>
> actions link.dll bind LIBRARIES
> {
>    ... -G $(STDLIBOPT) "$(>)" ...
> }
>
> STDLIBOPT will then expand to nothing when it
> isn't needed.
Thank you, appreciate the help. I will give it a try and then submit a PR.

Aparna
>
>> if [ MATCH "(std)" : $(OPTIONS) ]
>> {
>>       actions link.dll bind LIBRARIES
>>       {
>>                  "$(CONFIG_COMMAND)" $(OPTIONS) -L"$(LINKPATH)"
>> -R"$(RPATH)" -o
>>          "$(<)" -h$(<[1]:D=) -G  -library=stdcpp,CrunG3 "$(>)"
>> "$(LIBRARIES)"
>>          -Bdynamic -l$(FINDLIBS-SA) -Bstatic -l$(FINDLIBS-ST)
>> -B$(LINK-RUNTIME)
>>       }
>> }
>> else
>> {
>>   
>> actions link.dll bind LIBRARIES
>>       {
>>          ...
>>       }
>> }
>>
> In Christ,
> Steven Watanabe
>
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