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Use isatty() when using GNU libc
While isatty() is a POSIX interface and theoretically could be used more broadly than on Linux and macOS, use a conservative approach and use it on any platform that uses GNU libc.
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@ -161,7 +161,7 @@ namespace {
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#endif // Windows/ ANSI/ None
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#if defined( CATCH_PLATFORM_LINUX ) || defined( CATCH_PLATFORM_MAC )
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#if defined( CATCH_PLATFORM_LINUX ) || defined( CATCH_PLATFORM_MAC ) || defined( __GLIBC__ )
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# define CATCH_INTERNAL_HAS_ISATTY
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# include <unistd.h>
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#endif
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