Re: [Boost-users] linker error when using from_simple_string()

Subject: Re: [Boost-users] linker error when using from_simple_string()
From: Igor R (boost.lists_at_[hidden])
Date: 2013-03-17 16:18:24

>> >> > This line of code:
>> >> > date birthday(from_simple_string(s));
>> >> >
>> >> > causes this error:
>> >> > Undefined symbols for architecture x86_64:
>> >> >   "boost::gregorian::greg_month::get_month_map_ptr()", referenced
>> >> > from:
>> >> >       unsigned short
>> >> >
>> >> >
>> >> > boost::date_time::month_str_to_ushort<boost::gregorian::greg_month>(std::string
>> >> > const&) in boost2-aLwtLt.o
>> >> > ld: symbol(s) not found for architecture x86_64
>> >>
>> >>
>> >> Can you show the linker line? Do you link Boost.DateTime library?
>>
>> > Here is the linker line:
>> >  "/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min
>> > 10.8.0
>> > -o boost2
>> > /var/folders/hj/zc5pjqjd6gxgq2sw77xghkyh0000gn/T/boost2-JeVfpE.o
>> > -lstdc++ -lSystem /usr/bin/../lib/clang/4.1/lib/darwin/libclang_rt.osx.a
>> >
>> > No, I do not explicitly link to to Boost.DateTime.
>> > date_from_iso_string()
>> > works fine without linking, so I do not think it is required.
>>
>>
>> Please, read the manual:
>>
>> http://www.boost.org/doc/libs/1_53_0/doc/html/date_time/details.html#date_time.buildinfo
>
> I read the the page. Unfortunately, I saw nothing that was helpful. I am new
> to boost, so I perhaps missed it.
>
> I did a full install at the time I put boost on my MacBook. Therefore, I
> expect the libs are there. What am I missing?

You should link this library. Add -lboost_date_time to the linker options.