Code Yarns ‍👨‍💻
Tech BlogPersonal Blog

OpenCV IlmImf linker error

📅 2017-Dec-23 ⬩ ✍️ Ashwin Nanjappa ⬩ 🏷️ error, ilmimf, opencv, openexr ⬩ 📚 Archive

Problem

I had compiled OpenCV and when I linked my application with OpenCV libraries, I got this error:

undefined reference to `Imf_2_2::globalThreadCount()'

Solution

The Imf in the symbol above seems to be from the IlmImf library that is used to read and write OpenEXR images. Since I had no need for OpenEXR, I recompiled OpenCV with the setting WITH_OPENEXR=OFF. Linking with the resulting OpenCV libraries worked fine.