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Brad King authored
When `<LANG>_STANDARD` is not set we will not add any language standard flags. If `<LANG>_EXTENSIONS` is not OFF then our default is supposed to be ON. In order to support compilers that do not enable their extensions by default, check a `CMAKE_<LANG>_EXTENSION_COMPILE_OPTION` variable for an extensions flag to use without any language standard. Suggested-by: Norbert Lange <nolange79@gmail.com>
a2112257