Regarding Problem Running Example

[Unknown]

Hello Juan,

First off, thanks for an amazing product. Things looked really great and I feel like I will be able to do some quite interesting stuff with your product. I just have a quick question tho.

I am trying to run the sample code for fuzzylite 3.1 from the google code repo’s wiki and I get the following error.

/tmp/cchDy11d.o: In function `main’:
sample.cpp:(.text+0x4e): undefined reference to `fl::Engine::Engine(std::string const&)’
sample.cpp:(.text+0x244): undefined reference to `fl::InputVariable::InputVariable(std::string const&, double, double)’
sample.cpp:(.text+0x347): undefined reference to `fl::Triangle::Triangle(std::string const&, double, double, double)’
sample.cpp:(.text+0x3db): undefined reference to `fl::Triangle::Triangle(std::string const&, double, double, double)’
sample.cpp:(.text+0x46b): undefined reference to `fl::Triangle::Triangle(std::string const&, double, double, double)’
sample.cpp:(.text+0x512): undefined reference to `fl::OutputVariable::OutputVariable(std::string const&, double, double, bool)’
sample.cpp:(.text+0x629): undefined reference to `fl::Centroid::Centroid(int)’
sample.cpp:(.text+0x6dd): undefined reference to `fl::Triangle::Triangle(std::string const&, double, double, double)’
sample.cpp:(.text+0x771): undefined reference to `fl::Triangle::Triangle(std::string const&, double, double, double)’
sample.cpp:(.text+0x801): undefined reference to `fl::Triangle::Triangle(std::string const&, double, double, double)’
sample.cpp:(.text+0x888): undefined reference to `fl::RuleBlock::RuleBlock(std::string const&)’
sample.cpp:(.text+0x9d1): undefined reference to `fl::FuzzyRule::parse(std::string const&, fl::Engine const*)’
sample.cpp:(.text+0xa3d): undefined reference to `fl::FuzzyRule::parse(std::string const&, fl::Engine const*)’
sample.cpp:(.text+0xaa9): undefined reference to `fl::FuzzyRule::parse(std::string const&, fl::Engine const*)’
/tmp/cchDy11d.o: In function `fl::Any::Any()’:
sample.cpp:(.text._ZN2fl3AnyC2Ev[_ZN2fl3AnyC5Ev]+0x16): undefined reference to `vtable for fl::Any’
/tmp/cchDy11d.o: In function `fl::Extremely::Extremely()’:
sample.cpp:(.text._ZN2fl9ExtremelyC2Ev[_ZN2fl9ExtremelyC5Ev]+0x16): undefined reference to `vtable for fl::Extremely’
/tmp/cchDy11d.o: In function `fl::Not::Not()’:
sample.cpp:(.text._ZN2fl3NotC2Ev[_ZN2fl3NotC5Ev]+0x16): undefined reference to `vtable for fl::Not’
/tmp/cchDy11d.o: In function `fl::Seldom::Seldom()’:
sample.cpp:(.text._ZN2fl6SeldomC2Ev[_ZN2fl6SeldomC5Ev]+0x16): undefined reference to `vtable for fl::Seldom’
/tmp/cchDy11d.o: In function `fl::Somewhat::Somewhat()’:
sample.cpp:(.text._ZN2fl8SomewhatC2Ev[_ZN2fl8SomewhatC5Ev]+0x16): undefined reference to `vtable for fl::Somewhat’
/tmp/cchDy11d.o: In function `fl::Very::Very()’:
sample.cpp:(.text._ZN2fl4VeryC2Ev[_ZN2fl4VeryC5Ev]+0x16): undefined reference to `vtable for fl::Very’
/tmp/cchDy11d.o: In function `fl::Maximum::Maximum()’:
sample.cpp:(.text._ZN2fl7MaximumC2Ev[_ZN2fl7MaximumC5Ev]+0x16): undefined reference to `vtable for fl::Maximum’
/tmp/cchDy11d.o: In function `fl::Minimum::Minimum()’:
sample.cpp:(.text._ZN2fl7MinimumC2Ev[_ZN2fl7MinimumC5Ev]+0x16): undefined reference to `vtable for fl::Minimum’
collect2: error: ld returned 1 exit status
[Finished in 0.6s with exit code 1]

I’ve been trying to fix it, but am shallow in my understanding of programming fix it on the fly and have struggled for quite a bit of time now. I was wondering if you experienced this before or have any suggestions on how to possibly fix this.

Thanks!

[Juan Rada-Vilela (admin)]

Hi,

thank you for your post.

It seems that you may have built (and maybe installed) fuzzylite using floats instead of doubles, that is, with compiler option -DFL_USE_FLOAT.

You have to make sure that the library you are linking against is built without -DFL_USE_FLOAT. Moreover, please check if you have installed fuzzylite in your system (e.g. /usr/local/[include|lib]/), that is, if at some point you did sudo make install fuzzylite.

If you are going to be using floats instead of doubles, then you have to pass the compiler option -DFL_USE_FLOAT to your project too because you #include <fl/Headers.h>.

Let me know if this helps.

Cheers.

[Unknown]

Hello Ruan, I have the same issue using fuzzylite 4.0… how can I set the option -DFL_USE_FLOAT during installation?

[Unknown]

[UPDATE] So, i managed to install v5.0 and now I’m using it… but the same problem still remains.
In my case I am using float in my c++ program but when I tried to modify the CMakeFile line 15 to:
option(FL_USE_FLOAT “Use fl::scalar as float” ON)
it keeps building the library with -FL_USE_FLOAT=OFF

any solution?

[Juan Rada-Vilela (admin)]

Hi,

Modifying the CMakeLists.txt will not change the flag. You need to pass -DFL_USE_FLOAT=ON to CMake on command line.

For example,

cmake .. -G"Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DFL_BACKTRACE=ON -DFL_USE_FLOAT=ON -DFL_CPP11=ON

Or if you are using build.sh|bat, please modify such lines accordingly.

Let me know if you make it work.

For more information, please visit: http://fuzzylite.com/cpp/#Advanced_building_options

Cheers.

[Author]

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