[gn] Include libcxx configuration file

This was omitted in r359806 but is already referenced in the GN build.

llvm-svn: 359815

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/utils/gn/secondary/libcxx/config.gni b/llvm/utils/gn/secondary/libcxx/config.gni
new file mode 100644
index 00000000000..b90263a1f90
--- /dev/null
+++ b/llvm/utils/gn/secondary/libcxx/config.gni
@@ -0,0 +1,10 @@
+declare_args() {
+  # ABI version of libc++. Can be either 1 or 2, where 2 is currently not stable. Defaults to 1.
+  libcxx_abi_version = 1
+
+  # The inline ABI namespace used by libc++. It defaults to __n where `n` is the current ABI version.
+  libcxx_abi_namespace = ""
+
+  # Unstable ABI of libc++.
+  libcxx_abi_unstable = false
+}