including libraries

[bacpp]

hi,

I have the following code in my Makefile.am that works fine for simple programs:

bin_PROGRAMS=test
test_SOURCES=test.cpp

so, when I run 'make test', it runs the following command:
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:
g++ -o test test.cpp -L/usr/lib -lQuantLib

so, I modified my Makefile.am to include the following:
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 code

thanks!

[Estee]

Could you please post the entire content of your makefile along with the compile errors you get?

[bacpp]

hi Estee,

please find below the code for the makefile, and the linking errors....thanks!

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....I believe it is a linking error

[Estee]

Hi bacpp

I'm not at all an expert on makefiles, but I think maybe the problem is the order in which you pass arguments to g++. I'm not sure though. but try this: (be careful with copy-paste as the indention is off)

SOURCE = test.cpp
LIBS   = -L/usr/lib -lQuantLib
test:
    ${CXX} ${CXXFLAGS} -o $@ ${SOURCE} ${LIBS}

This makefile produces the following:

 	
g++ -o test test.cpp -L/usr/lib -lQuantLib

The makefile you posted produced:

g++ -L/usr/lib -o bin_PROGRAMS test.cpp -lQuantLib

Remember that here:

bin_PROGRAMS:
    ${CXX} ${CXXFLAGS} ${LDFLAGS} -o $@ ${test_SOURCES} ${test_LDADD}

bin_PROGRAMS does not refer to ${bin_PROGRAMS}, so your output will be an executable named bin_PROGRAM. You are actually not using the ${bin_PROGRAMS} variable. When you refer to $@ you refer to the target:

bin_PROGRAMS: <-Target
    ${CXX} ${CXXFLAGS} ${LDFLAGS} -o $@ ${test_SOURCES} ${test_LDAD}

I have the lib path and name in the same variable, and this is a matter of taste and therefore completely optional.

Hope it worked.

[bacpp]

hi Estee,
thanks for the correction...

so I did the following:

SOURCE = test.cpp
LIBS   = -L/usr/lib -lQuantLib
test:
	 ${CXX} ${CXXFLAGS} -o $@ ${SOURCE} ${LIBS}

when i run make test, it returns:

g++ test.cpp -o test

why would it not be reading ${LIBS}.....

[Estee]

Ahh, it seems I did not read your first post thoroughly enough. :-)

What you need to do is:
Rename MakeFile.am to MakeFile and try it again.

When you run

make test

the Make utility looks for a file named MakeFile. It does not look for a MakeFile.am. MakeFile.am is a file generated by automake. So in your case, it does not find a Makefile and it just do a standard compilation of test.cpp
An easy way to test this is to issue

make

instead of

make [target]

The latter command is only used if you have more than one MakeFile in your working directory.

Hope this did the trick ;-)

[bacpp]

aha, it worked like a charm....thanks Estee...I used the following code and renamed the file...and then issued make

AM_LDFLAGS = -L/usr/lib
bin_PROGRAMS = test
_SOURCES = test.cpp
_LDADD = -lQuantLib
${bin_PROGRAMS}:
	${CXX} ${CXXFLAGS} -o $@ ${_SOURCES} ${AM_LDFLAGS} ${_LDADD}

thx very much!

[Estee]

No problem :-)