[gn build] (manually) port c6eaa14e11

diff --git a/llvm/utils/gn/secondary/libcxx/src/BUILD.gn b/llvm/utils/gn/secondary/libcxx/src/BUILD.gn
index 150ab64..7403ebf 100644 (file)
--- a/llvm/utils/gn/secondary/libcxx/src/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/src/BUILD.gn
@@ -130,6 +130,7 @@ cxx_sources = [
   "include/config_elast.h",
   "include/refstring.h",
   "ios.cpp",
+  "ios.instantiations.cpp",
   "iostream.cpp",
   "locale.cpp",
   "memory.cpp",