@ianlancetaylor requested issue #42655 to be considered for backport to the next 1.15 minor release.
@gopherbot Please open backport issues
Although this was filed against x/mobile, the fix is to runtime/cgo in the standard library. This is caused by a change in the default behavior of the C compiler. Anybody using an older release of Go with a new C compiler will run into this problem. Since the fix is small and safe, we should backport it.