Hi Jeff, Thanks for the suggestion. I actually was trying to use the static library. I put both the static and dynamic library in a directory, and included the directory in my make file. But obviously, g++ can not find it somehow, are you aware of anything else that could be the problem? Thanks George

...

Hi everyone,

I just downloaded boost, built it on windows using cygwin. However, when I tried to run an example program. I got a the following link error

[Linker error] undefined reference to `boost::gregorian::greg_month::as_short_string() const'

I have added the corresponding lib and include directories to my make file.

Is there anything I am missing? Any help will be greatly appreciated.

Sounds like you are using the dynamic lib version of the date-time library.

You might try 1) using the static library instead 2) making sure the libboost_date_time.dll is in your search path

With number 2 the easiest way is to copy the dll into the same directory as your executable. But really, I think the static lib is the easiest way to go...

HTH,

Jeff

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Jeff, Below is part of my make file CPP = g++.exe CC = gcc.exe WINDRES = windres.exe RES = OBJ = main.o $(RES) LINKOBJ = main.o $(RES) LIBS = -L"D:/Dev-Cpp499/lib" -L"D:/boost/lib" -L"D:/boost/lib/libboost_date_time-gcc-1_31.a" INCS = -I"D:/Dev-Cpp499/include" CXXINCS = -I"D:/Dev-Cpp499/include/c++/3.3.1" -I"D:/Dev-Cpp499/include/c++/3.3.1/mingw32" -I"D:/Dev-Cpp499/include/c++/3.3.1/backward" -I"D:/Dev-Cpp499/lib/gcc-lib/mingw32/3.3.1/include" -I"D:/Dev-Cpp499/include" -I"D:/boost/include/boost-1_31" BIN = newtest.exe CXXFLAGS = $(CXXINCS) CFLAGS = $(INCS) all: all-before newtest.exe all-after clean: clean-custom rm -f $(OBJ) $(BIN) $(BIN): $(OBJ) $(CPP) $(LINKOBJ) -o "newtest.exe" $(LIBS) main.o: main.cpp $(CPP) -c main.cpp -o main.o $(CXXFLAGS) I did include the libboost_date_time-gcc-1_31 but it did not work. Can you spot something I am not doing correctly? Thanks for the help. George --- Jeff Garland wrote:

On Mon, 20 Sep 2004 10:12:02 -0700 (PDT), Zhoujie Mao wrote

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Hi Jeff,

Thanks for the suggestion. I actually was trying to use the static library. I put both the static and dynamic library in a directory, and included the directory in my make file.

I'm not sure what this means, but it needs to be in the link parameters of the command -- see below.

...

But obviously, g++ can not find it somehow, are you aware of anything else that could be the problem? Thanks

Ok, well if you are using gcc I assume you have something like libboost_date_time-gcc-d-1_31.a as the static lib. You should have a -L switch which points to the directory that file is in and a -lboost_date_time-gcc-d-1_31

So you compile command should look something like:

g++ -I${BOOST_ROOT} -L{BOOST_LIB_ROOT} -l boost_date_time-gcc-d-1_31 YOURFILE.cpp -o whatever.exe

Jeff

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On Mon, 20 Sep 2004 20:33:51 -0700 (PDT), Zhoujie Mao wrote I'm going to presume the built library file libboost_date_time-gcc-1_31.a is in D:/boost/lib. Please double check that.

Below is part of my make file CPP = g++.exe CC = gcc.exe WINDRES = windres.exe RES = OBJ = main.o $(RES) LINKOBJ = main.o $(RES) LIBS = -L"D:/Dev-Cpp499/lib" -L"D:/boost/lib" -L"D:/boost/lib/libboost_date_time-gcc-1_31.a" ^^^^^^^^^^^^ this looks wrong ^^^^^^^^^^^ change it to the following:

-lboost_date_time-gcc-1_31 so your LIBS line looks like: LIBS = -L"D:/Dev-Cpp499/lib" -L"D:/boost/lib" -lboost_date_time-gcc-1_31

I did include the libboost_date_time-gcc-1_31 but it did not work.

Well, not actually because the -L controls the search path and you can't point it directly to the library.... HTH, Jeff

Zhoujie Mao wrote:

Thanks Jeff and Vladimir. The problem is gone. But a new one came up.

[Linker error] undefined reference to `pthread_mutex_lock'

I guessed I should include libboost-thread-gcc-1_31 as well. But I only found libboost-thread-gcc-1_31.dll, is there anyway I can get around this? or I am out of luck with windows?

Try adding -mthread to the linker command line (I'm not sure about the spelling, for check the docs). Or add -DBOOST_DISABLE_THREADS to the compiler options and rebuild. This assumes you're using gcc 3.3. BTW, it's always a good idea to specify the version of compiler you're using, for gcc it can be obtained with "gcc -v". HTH, Volodya