OptiX headers (optix.h and friends) not found.

[bipul-mohanto]

Hello,

I am using the following configuration:

• Ubuntu 20.04.4 LTS
• cmake version 3.16.3
• Cuda compilation tools, release 11.6, V11.6.124
• Build cuda_11.6.r11.6/compiler.31057947_0
• gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
• gdb 9.2
• NVIDIA-SMI 510.47.03 Driver Version: 510.47.03 CUDA Version: 11.6

During installing OptiX 7.4, I have defined the OptiX_DIR with the command: export OptiX_INSTALL_DIR=/home/computer-name/Downloads/NVIDIA-OptiX-SDK-7.4.0-linux64-x86_64

Problem:

• Although I have predefined OptiX_INSTALL_DIR, if I BUILD optix7course from CMakeGUI, I need to define manually again the OptiX_INSTALL_DIR. If I set it to NVIDIA-OptiX-SDK-7.4.0-linux64-x86_64 directory, both configure and generate works fine. However, when I am opening the repository with CLion IDE, it is returning the errors:

  CMake Error at common/gdt/cmake/FindOptiX.cmake:103 (message):
  OptiX headers (optix.h and friends) not found.  Please locate before
  proceeding.
  Call Stack (most recent call first):
  common/gdt/cmake/FindOptiX.cmake:115 (OptiX_report_error)
  common/gdt/cmake/configure_optix.cmake:24 (find_package)
  CMakeLists.txt:37 (include)

• If I try to build to repository using cmake .. from the terminal, the exact same error is showed up.

• The CmakeError.log shows something like this:

  CheckFunctionExists.c.o -o cmTC_412b3  -lpthreads 
  /usr/bin/ld: cannot find -lpthreads
  collect2: error: ld returned 1 exit status
  make[1]: *** [CMakeFiles/cmTC_412b3.dir/build.make:99: cmTC_412b3] Error 1
  make[1]: Leaving directory '/home/computer-name/Desktop/optix7course/BUILD/CMakeFiles/CMakeTmp'
  make: *** [Makefile:127: cmTC_412b3/fast] Error 2

[bipul-mohanto]

CMake Error at common/gdt/cmake/FindOptiX.cmake:103 (message):
  OptiX headers (optix.h and friends) not found.  Please locate before
  proceeding.
Call Stack (most recent call first):
  common/gdt/cmake/FindOptiX.cmake:115 (OptiX_report_error)
  common/gdt/cmake/configure_optix.cmake:24 (find_package)
  CMakeLists.txt:37 (include)

[bipul-mohanto]

Okay, I found the solution.

1. Update the FindOptiX.cmake with set(OptiX_INSTALL_DIR "/home/name-computer/Downloads/NVIDIA-OptiX-SDK-7.4.0-linux64-x86_64"). This solved the first problem, but lead to another BIN2CC not found, although I have defined bin2cc in cmake build.
2. This previous issue helped me, I have manually modified the CMakeCache.txt and configure_optix.cmake with set(BIN2C /usr/local/cuda-11.6/bin/bin2c). This solved the BIN2CC problem, but lead me to another compile time error.
3. So finally I deleted all the CMakeCache.txt files, but kept the configure_optix.cmake with set(BIN2C /usr/local/cuda-11.6/bin/bin2c) and made a fresh cmake build.
4. And finally it is working.