Re: [boost] Support for Android

Subject: Re: [boost] Support for Android
From: Antony Polukhin (antoshkka_at_[hidden])
Date: 2014-01-22 02:04:16

2014/1/22 Vladimir Prus <ghost_at_[hidden]>

> On 22.01.2014 10:15, Antony Polukhin wrote:
>
>> >Would your scripts take care of -lrt?
>>> >What about -lpthread?
>>>
>>
>> No. No. This must be fixed by bjam or Google (preferable).
>>
>
> Would the below patch, along with using target-os=android when building,
> do the trick?
>

Looks like it will do the trick! Thanks a lot!

However this arise a question:
Who is in charge of specifying platform specific thread libraries? Bjam or
each library developer?

For example Boost.Chrono has the following:
./chrono/build/Jamfile.v2:        <target-os>freebsd:<linkflags>"-lrt"
./chrono/build/Jamfile.v2:        <target-os>linux:<linkflags>"-lrt
-lpthread"
./chrono/perf/Jamfile.v2:        <target-os>freebsd:<linkflags>"-lrt"
./chrono/perf/Jamfile.v2:        <target-os>linux:<linkflags>"-lrt"
./chrono/test/Jamfile.v2:        <target-os>freebsd:<linkflags>"-lrt"
./chrono/test/Jamfile.v2:        <target-os>linux:<linkflags>"-lrt
-lpthread"

While bjam has exactly the same rules:
        switch $(target)
        {
            case windows : option = -mthreads ;
            case cygwin  : option = -mthreads ;
            case solaris : option = -pthreads ; libs = rt ;
            case beos    : # No threading options.
            case *bsd    : option = -pthread ;  # There is no -lrt on BSD.
            case sgi     : # gcc on IRIX does not support multi-threading.
            case darwin  : # No threading options.
            case *       : option = -pthread ; libs = rt ;
        }

And why do these rules do not work:
If I remove handwritten rules from one of the jamfiles, I'll get

../../../bin.v2/libs/variant/perf/move_perf.test/gcc-4.6/release/link-static/move_perf.o:
In function `scope::~scope()':
move_perf.cpp:(.text._ZN5scopeD2Ev[_ZN5scopeD5Ev]+0x1b): undefined
reference to `clock_gettime'

-- 
Best regards,
Antony Polukhin