CODEWITHSUNDEEP
c++linkerblas
Armin Meisterhirn
Armin Meisterhirn

Reputation: 801

Linker GCC Undefined reference to symbol

I'm trying the following command:

gcc -o test test.o -lblas

which gives the error:

/usr/bin/ld: test.o: undefined reference to symbol 'sqrtf@@GLIBC_2.2.5'
/usr/bin/ld: note: 'sqrtf@@GLIBC_2.2.5' is defined in DSO /lib64/libm.so.6 so try adding     it to the linker command line

/lib64/libm.so.6: could not read symbols: Invalid operation collect2: error: ld returned 1 exit status

However, when I add -lm at the end of the command, there is a whole bunch of error messages:

test.o: In function `main':
test.cpp:(.text+0xe9): undefined reference to `std::cout'
test.cpp:(.text+0xee): undefined reference to `std::basic_ostream<char, 
std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char,   
std::char_traits<char> >&, char const*)'
[...]
collect2: error: ld returned 1 exit status

Upvotes: 2

Views: 4607

Answers (1)

Wattskemov
Wattskemov

Reputation: 766

I have the same problem with you when I tried to link other libraries.

Here is my solutions:

  1. install libtool;

  2. add the library path to LD_LIBRARY_PATH;

  3. I use root to make.

I don't know the exactly reason why it works on my Ubuntu. But I think you can try these steps.

Upvotes: 2

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