1 files changed, 11 insertions, 0 deletions
diff --git a/src/common.h b/src/common.h
index b8791279..0c1b77d4 100644
--- a/src/common.h
+++ b/src/common.h
@@ -21,6 +21,13 @@
 #include "fallback.h"  // IWYU pragma: keep
 #include "signal.h"    // IWYU pragma: keep
 
+// Define a symbol we can use elsewhere in our code to determine if we're being built on MS Windows
+// under Cygwin.
+#if defined(_WIN32) || defined(_WIN64) || defined(WIN32) || defined(__CYGWIN__) || \
+    defined(__WIN32__)
+#define OS_IS_CYGWIN
+#endif
+
 /// Avoid writing the type name twice in a common "static_cast-initialization". Caveat: This doesn't
 /// work with type names containing commas!
 #define CAST_INIT(type, dst, src) type dst = static_cast<type>(src)
@@ -188,6 +195,10 @@ extern const wchar_t *program_name;
 void read_ignore(int fd, void *buff, size_t count);
 void write_ignore(int fd, const void *buff, size_t count);
 
+/// Set to false at run-time if it's been determined we can't trust the last modified timestamp on
+/// the tty.
+extern bool has_working_tty_timestamps;
+
 /// This macro is used to check that an input argument is not null. It is a bit lika a non-fatal
 /// form of assert. Instead of exit-ing on failure, the current function is ended at once. The
 /// second parameter is the return value of the current function on failure.