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including libraries in Makefile.am

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# 1  
Old 06-13-2011
including libraries in Makefile.am
hi,
I have the following code in my Makefile.am that works fine for simple programs:
Code:
bin_PROGRAMS=test
test_SOURCES=test.cpp

so, when I run 'make test', it runs the following command:
Code:
g++ -o test test.cpp

however, when I tried to run a program that includes the QuantLib library, I have to give the following command:
Code:
g++ -o test test.cpp -L/usr/lib -lQuantLib

so, I modified my Makefile.am to include the following:
Code:
test_LDADD = /usr/lib/libQuantLib.so

but that doesn't work; it gives me the same bunch of errors as it does if I only ran my test program without the -L and -l flags.

Can you please help me fix my Makefile.am

thanks!
Last edited by pludi; 06-13-2011 at 05:29 PM..
# 2  
Old 06-13-2011
-lQuantLib tells the linker to link the file libQuantLib.a, that is a static library, not a dynamic one (shared object) .so, which, being a dynamic
lib, would get loaded at runtime. Just specify the -lQuantLib in the rule:
Code:
LDFLAGS += -L/usr/lib
test_LDADD = -lQuantLib
bin_PROGRAMS:
         ${CXX} ${CXXFLAGS} ${LDFLAGS} -o $@ ${test_SOURCES} ${test_LDADD}

should do the trick, although /usr/lib should be in the default path to check for libs, and shouldn't need to be explicitly defined.
Obviously, file libQuantLib.a needs to be present in /usr/lib.
# 3  
Old 06-13-2011
hi mirni, thx. for your response.
I edited my Makefile with that code, but it still gives me the undefined reference errors.
Makefile.am
Code:
LDFLAGS+ = -L/usr/lib
bin_PROGRAMS = test
test_SOURCES=test.cpp
test_LDADD = -lQuantLib
bin_PROGRAMS:
    ${CXX} ${CXXFLAGS} ${LDFLAGS} -o $@ ${test_SOURCES} ${test_LDADD}

here's a sample of the errors:
Code:
test.o:(.rodata._ZTIN8QuantLib13TermStructureE[typeinfo for QuantLib::TermStructure]+0x0): undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
test.o:(.rodata._ZTIN8QuantLib12ExtrapolatorE[typeinfo for QuantLib::Extrapolator]+0x0): undefined reference to `vtable for __cxxabiv1::__class_type_info'
test.o:(.rodata._ZTIN8QuantLib19StochasticProcess1D14discretizationE[typeinfo for QuantLib::StochasticProcess1D::discretization]+0x0): undefined reference to `vtable for __cxxabiv1::__class_type_info'
test.o:(.rodata._ZTIN8QuantLib17StochasticProcess14discretizationE[typeinfo for QuantLib::StochasticProcess::discretization]+0x0): undefined reference to `vtable for __cxxabiv1::__class_type_info'
test.o:(.rodata._ZTIN8QuantLib5QuoteE[typeinfo for QuantLib::Quote]+0x0): undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
test.o:(.rodata._ZTIN8QuantLib7VisitorINS_6PayoffEEE[typeinfo for QuantLib::Visitor<QuantLib::Payoff>]+0x0): undefined reference to `vtable for __cxxabiv1::__class_type_info'

when at the $ prompt, I give the following command:
g++ -o test test.cpp -L/usr/lib -lQuantLib
it works perfectly fine??
# 4  
Old 06-14-2011
Code:
LDFLAGS += -L/usr/lib

The plus and equal need to be together, it's one operator, just like in C.
To debug Makefile, you should look at the command that's executed when you run 'make'. The command that's being run is echoed on stdout. Look carefully at that command -- it should be exactly what you want:
Code:
g++ -L/usr/lib -o test test.cpp -lQuantLib

Since you are getting the errors, you will see something else:
it'll be missing either the -L/usr/lib or -lQuantLib.

Also, just to be safe, delete the old object file test.o before recompiling.
# 5  
Old 06-14-2011
hi mirni,
thanks for the correction.
I was getting an error message with LD_FLAGS, wherein automake warned me to use AM_LDFLAGS since LD_FLAGS is a user defined variable. then I got warned to use = for AM_LDFLAGS before using +=, so I rewrote Makefile.am as:
Code:
AM_LDFLAGS = -L/usr/lib
bin_PROGRAMS = test
test_SOURCES=test.cpp
test_LDADD = -lQuantLib
bin_PROGRAMS:
    ${CXX} ${CXXFLAGS} ${AM_LDFLAGS} -o $@ ${test_SOURCES} ${test_LDADD}

and when I run make test,
this is what it shows:
Code:
g++ -c -o test.o test.cpp

I deleted the old test.o file, and re-ran 'make test'
Code:
g++ test.cpp -o test

so, obviously it is not reading the -L or -l flags....any thoughts
why and how I can fix it...
# 6  
Old 06-14-2011
Sorry bacpp, I mistakenly thought you were writing a Makefile and using GNU make. My advice was for that case.
Usage of GNU automake and Makefile.am is different, and I don't have experience with writing Makefile.am myself, but from automake it seems that all you need is:
Code:
test_LDADD = /usr/lib/libQuantLib.a

# 7  
Old 06-14-2011
thanks mirni, but it still ain't working Smilie....I think I will go and study the Libtool and try it again Smilie....if it works, I'll post the code here.
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