From d0dc2e7c5f6770d8ed4a480f4614a4bcc0fc922c Mon Sep 17 00:00:00 2001
From: Juho Kahala <57393910+quaternic@users.noreply.github.com>
Date: Tue, 3 Feb 2026 07:03:21 +0200
Subject: [PATCH] add -Zjson-target-spec to custom target workflows (#1071)

With the json target specification format destabilized in
https://github.com/rust-lang/rust/pull/150151, `-Zjson-target-spec` is
needed for custom targets. This should resolve the CI failures seen in
rust-lang/compiler-builtins#1070
---
 library/compiler-builtins/.github/workflows/main.yaml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/library/compiler-builtins/.github/workflows/main.yaml b/library/compiler-builtins/.github/workflows/main.yaml
index 6a4c72c5bc47..1572a8ec6cd1 100644
--- a/library/compiler-builtins/.github/workflows/main.yaml
+++ b/library/compiler-builtins/.github/workflows/main.yaml
@@ -230,7 +230,8 @@ jobs:
         # poorly with build scripts)
         cargo build -p compiler_builtins -p libm \
           --target etc/thumbv7em-none-eabi-renamed.json \
-          -Zbuild-std=core
+          -Zbuild-std=core \
+          -Zjson-target-spec
 
   # FIXME: move this target to test job once https://github.com/rust-lang/rust/pull/150138 merged.
   build-thumbv6k:
@@ -248,7 +249,8 @@ jobs:
     - run: |
         cargo build -p compiler_builtins -p libm \
           --target etc/thumbv6-none-eabi.json \
-          -Zbuild-std=core
+          -Zbuild-std=core \
+          -Zjson-target-spec
 
   benchmarks:
     name: Benchmarks