Fix unused variable treatment #139
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This is a bit difficult to detect, so for now we conservatively say that macOS always uses clang, and clang-based compilers always are called "clang".
vegorov-rbx
approved these changes
Nov 5, 2021
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Right now our CMake infra specifies -Wno-unused only for GCC builds, but Makefile specifies it for all builds.
The intent has been to use it just for GCC, so we now do that by detecting the compiler version - this should
equalize the behavior across different types of builds.
Separately, latest version of clang appears to expose an unused variable that clang-10 was okay with, so fix that.
Fixes #136