linux-gcc_7.3
linux-gcc_8.2
linux-clang_5.0
linux-clang_6.0
linux-clang_6.0_libc++
linux-clang_7.0
linux-clang_7.0_libc++
macos_10.13-clang_9.1
macos_10.13-clang_10.0
macos_10.13-homebrew_gcc_8.1
freebsd_11-clang_3.8
windows_10-msvc_15u8
windows_10-msvc_14u3
windows_10-mingw_w64_gcc_7.3