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-rw-r--r--dmyext.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/dmyext.c b/dmyext.c
index 4d273f7faf..66be95ab4e 100644
--- a/dmyext.c
+++ b/dmyext.c
@@ -1,3 +1,17 @@
+// This file is used by dynamically-linked ruby, which has no
+// statically-linked extension libraries.
+//
+// - miniruby does not use this Init_ext. Instead, "miniinit.c"
+// provides Init_enc, which does nothing too. It does not support
+// require'ing extension libraries.
+//
+// - Dynamically-linked ruby uses this Init_ext, which does
+// nothing. It loads extension libraries by dlopen, etc.
+//
+// - Statically-linked ruby does not use this Init_ext. Instead,
+// "ext/extinit.c" (which is a generated file) defines Init_ext,
+// which activates the (statically-linked) extension libraries.
+
void
Init_ext(void)
{