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-rw-r--r--runtime/GCCLibraries/README.txt7
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+This directory contains libraries which are used when building the GCC
+front-end. For the most part, these are just stub libraries, but some
+of them contain actual code.
+
+In particular, the crtend library contains the runtime code to handle
+static constructors and destructors for C and C++ programs.
+