build_packages: Don't transitively upgrade dev-lang/rust
Rust is getting upgraded in some builders because of transitive BDEPEND dependencies
causing build breakage. Exempt rust from building as a critical toolchain package
if a prebuilt is not available.
BUG=chromium:1050752, chromium:1126288
TEST=`build_packages`
Change-Id: I399651e7b4bb4febabad64878348d39a670c63f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2399768
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Wei-Cheng Xiao <garryxiao@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/build_packages b/build_packages
index 6a9f5f9..dfda48d 100755
--- a/build_packages
+++ b/build_packages
@@ -441,6 +441,7 @@
# to `emerge` below once we figure out how to exclude toolchain packages from
# being upgraded transitively via BDEPEND relations.
CRITICAL_SDK_PACKAGES=(
+ "dev-lang/rust"
"sys-libs/glibc"
"sys-devel/gcc"
)
