Croaring error when run in linux

[Aniket Agarwalla]

Please help me rectify this,

aniket@aniket-VirtualBox:~/Desktop/bitmap$ g++ main.cpp
/usr/bin/ld: /tmp/cc0q6VnI.o: in function `roaring_bitmap_init_cleared':
main.cpp:(.text.roaring_bitmap_init_cleared[_ZN7roaring7RoaringC5Ev]+0x19): undefined reference to `roaring_bitmap_init_with_capacity'
/usr/bin/ld: /tmp/cc0q6VnI.o: in function `roaring::Roaring::Roaring(roaring::Roaring const&)':
main.cpp:(.text._ZN7roaring7RoaringC2ERKS0_[_ZN7roaring7RoaringC5ERKS0_]+0x32): undefined reference to `roaring_bitmap_overwrite'
/usr/bin/ld: /tmp/cc0q6VnI.o: in function `roaring::Roaring::add(unsigned int)':
main.cpp:(.text._ZN7roaring7Roaring3addEj[_ZN7roaring7Roaring3addEj]+0x20): undefined reference to `roaring_bitmap_add'
/usr/bin/ld: /tmp/cc0q6VnI.o: in function `roaring::Roaring::~Roaring()':
main.cpp:(.text._ZN7roaring7RoaringD2Ev[_ZN7roaring7RoaringD5Ev]+0x18): undefined reference to `roaring_bitmap_clear'
/usr/bin/ld: /tmp/cc0q6VnI.o: in function `roaring::Roaring::cardinality() const':
main.cpp:(.text._ZNK7roaring7Roaring11cardinalityEv[_ZNK7roaring7Roaring11cardinalityEv]+0x18): undefined reference to `roaring_bitmap_get_cardinality'
collect2: error: ld returned 1 exit status

[Daniel Lemire]

You do not tell us what is in 'main.cpp', and it is not clear how you are compiling or linking against CRoaring, but the error is telling you that you are missing function definitions.

[Aniket Agarwalla]

Hi, I have used example2.cpp given in tests, and tried to compile it using g++ main.cpp after doing the CMake build and make install. when I run the ctests it worked completely fine. I wanted to know what command I should use to compile the files or do we have a makefile for that.

[Daniel Lemire]

There are many ways to use a C library. Here is an example using CMake:

https://github.com/RoaringBitmap/croaring_cmake_demo_from_single_header

[Aniket Agarwalla]

Thanks a lot sir for the information.

 It helped me.

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