rust: Force all dependencies to be linked, used or not
`rustc` added an unstable feature that makes `--extern` do what we
originally wanted - it links the provided library, *even* if the source
code does not reference it.
The primary use case for this is that it makes it possible for us to
build dylibs out of `#![no_std]` crates without modifying the source,
because we can pass in `--extern force:path/to/libstd.dylib.so`.
Bug: 168927099
Test: m, TH
Change-Id: Ibc3b75012d54b73e40ae609784cdc74e02e8f008
diff --git a/rust/config/global.go b/rust/config/global.go
index 66ffc0b..0a4b314 100644
--- a/rust/config/global.go
+++ b/rust/config/global.go
@@ -42,6 +42,8 @@
}
GlobalRustFlags = []string{
+ // Allow `--extern force:foo` for dylib support
+ "-Z unstable-options",
"-Z stack-protector=strong",
"-Z remap-cwd-prefix=.",
"-C debuginfo=2",