Re: [Boost-users] problems linking boost_date_time

From: raulh39_at_[hidden]
Date: 2008-01-16 15:05:30

On Tue, 15 Jan 2008 21:47:39 +0100
jerome.wacongne_at_[hidden] wrote:

> Hi, 
> 
> Here is what I get when I try to link my unit tests agains 
> boost_date_time. 
> 
> g++ -LC:\dev\workspace\fxoverlayFundation\Debug 
> -LC:\dev\workspace\fxoverlayBusiness\Debug -LC:\dev\boost_1_34_1\stage\lib 
> -ofxoverlayBusinessTests.exe emptyTests.o allTests.o InterestRateTests.o 
> InterestCurveTests.o -lboost_date_time-mgw34-d-1_34_1 
> -lboost_unit_test_framework-mgw34-d-1_34_1 -lfxoverlayBusiness 
> -lfxoverlayFundation 
> C:\dev\workspace\fxoverlayBusiness\Debug/libfxoverlayBusiness.a(InterestCurve.o): 
> In function 
> `ZSt10_ConstructISt4pairIKSsN3com9fxoverlay8business1
> 2InterestRateEES6_EvPT_RKT0_': ... undefined
> reference to `boost::gregorian::greg_month::as_long_string() const' 
> 

Libraries should be listed (with the -l option) in "ascending order of use", that is, if library A uses library B, then library B should be listed after A.

The error message says that libfxoverlayBusiness.a uses boost::gregorian, that is, libboost_date_time-mgw34-d-1_34_1.a, so libboost_date_time-mgw34-d-1_34_1.a should be listed after libfxoverlayBusiness.a, but you have listed it before.

So: try to change the order of the "*.o" and "*.a" to make the linker happy. ;)

HTH,
Raul.