Update pkg setup

nix/bisheng-wrapper-setup-hook.sh

@@ -0,0 +1,16 @@
+# Setup hook for bisheng-wrapper (source when package is in buildInputs).
+# Use alone when ASCEND_TOOLKIT_HOME already points at a CANN install (Nix or not).
+addToSearchPath PATH "@WRAPPER_OUT@/bin"
+
+if [ -n "${ASCEND_TOOLKIT_HOME:-}" ]; then
+  _ascend_arch_linux="$(uname -m)-linux"
+  export BISHENG_REAL="${ASCEND_TOOLKIT_HOME}/${_ascend_arch_linux}/ccec_compiler/bin/bisheng"
+fi
+
+export CMAKE_C_COMPILER="@WRAPPER_OUT@/bin/bisheng"
+export CMAKE_CXX_COMPILER="@WRAPPER_OUT@/bin/bisheng"
+
+if [ -f "@WRAPPER_OUT@/nix-support/bisheng-nix-cflags" ]; then
+  export NIX_CFLAGS_COMPILE_bisheng="$(cat "@WRAPPER_OUT@/nix-support/bisheng-nix-cflags")"
+  export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE_bisheng"
+fi