[BUG] MINIMUM_GCC_VERSION is incorrect

[mwestphal]

Environment

Operating System: Linux Version / Commit SHA: 11.0 Other: gcc

Describe the bug

MINIMUM_GCC_VERSION is currently too high, with value 9.3.1. As the comment above in cmake/config/OpenVDBVersions.cmake states:

  # @Note  Compiler versions are not really a hard and fast rule, you just need
  # a compiler with complete support for our MINIMUM_CXX_STANDARD (currently 17).
  # What's usually important is that the version of libstdc++ and glibc in use
  # matches. Compilers other than GCC should provide options to ensure this
  # targetting e.g. --gcc-toolchain and -fgnuc-version with Clang.

I've been modifying the value to 8.4.0 and it works fine.

[Idclip]

Hi @mwestphal,

We're working off the following comment in the C++ 17 status page from the GCC manual https://gcc.gnu.org/projects/cxx-status.html:

Some C++17 features are available since GCC 5, but support was experimental and the ABI of C++17 features was not stable until GCC 9.

The minor/patch version numbers were chosen to match the VFX platform, but strictly speaking this version could indeed by 9.0.0. From the comment quoted above, I don't think we want to drop it further. You're welcome to use earlier versions and can define the -D DISABLE_DEPENDENCY_VERSION_CHECKS=OFF to suppress these requirements, but these are the minimum versions we guarantee support for

[mwestphal]

-D DISABLE_DEPENDENCY_VERSION_CHECKS=OFF I missed this, indeed, an acceptable fix.