env/corellium: mention cgo and clangwrapper must be used
Change-Id: Id40da315377b4f201ed9b9ac256e965e3bfa913d
Reviewed-on: https://go-review.googlesource.com/c/build/+/367114
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
diff --git a/env/corellium/ios/install.sh b/env/corellium/ios/install.sh
index ec1501c..81b5330 100755
--- a/env/corellium/ios/install.sh
+++ b/env/corellium/ios/install.sh
@@ -6,9 +6,13 @@
#
# Put a builder key in `buildkey`.
#
-# Use `bootstrap.bash` from the Go standard distribution to build a
-# ios/arm64 bootstrap toolchain and put it in
-# `go-ios-arm64-bootstrap.tbz`.
+# Use `bootstrap.bash` from the Go standard distribution and build a
+# ios/arm64 bootstrap toolchain with cgo enabled and the compiler set
+# to the clang wrapper from $GOROOT/misc/ios:
+#
+# GOOS=ios GOARCH=arm64 CGO_ENABLED=1 CC_FOR_TARGET=$(pwd)/../misc/ios/clangwrap.sh ./bootstrap.bash
+#
+# Put it in `go-ios-arm64-bootstrap.tbz`.
#
# Finally, install.sh assumes an iPhone SDK in `iPhoneOS.sdk`.
