Auto merge of #2071 - kaniini:s390x-musl, r=Amanieu

add definitions for s390x musl targets

Add support for s390x musl targets to libc.

I haven't added CI because I am not familiar with the pipelines, but would be glad to do so if somebody outlines what needs to be done.

2 files changed, 24 insertions, 0 deletions

diff --git a/ci/docker/s390x-unknown-linux-musl/Dockerfile b/ci/docker/s390x-unknown-linux-musl/Dockerfile
new file mode 100644
index 0000000000..f83ee8c9c8
--- /dev/null
+++ b/ci/docker/s390x-unknown-linux-musl/Dockerfile
@@ -0,0 +1,17 @@
+FROM ubuntu:20.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        curl ca-certificates \
+        gcc \
+        gcc-s390x-linux-gnu \
+        qemu-user
+
+COPY install-musl.sh /
+RUN sh /install-musl.sh s390x
+
+# FIXME: shouldn't need the `-lgcc` here, shouldn't that be in libstd?
+ENV CARGO_TARGET_S390X_UNKNOWN_LINUX_GNU_LINKER=s390x-linux-gnu-gcc \
+    CARGO_TARGET_S390X_UNKNOWN_LINUX_GNU_RUNNER="qemu-s390x -L /musl-s390x" \
+    CC_s390x_unknown_linux_gnu=musl-gcc \
+    RUSTFLAGS='-Clink-args=-lgcc' \
+    PATH=$PATH:/musl-s390x/bin:/rust/bin
diff --git a/ci/install-musl.sh b/ci/install-musl.sh
index 88cb4f0b11..54fd343f07 100644
--- a/ci/install-musl.sh
+++ b/ci/install-musl.sh
@@ -60,6 +60,13 @@ case ${1} in
           ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
         make install -j4
         ;;
+    s390x)
+        musl_arch=s390x
+        kernel_arch=s390
+        CC=s390x-linux-gnu-gcc \
+          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
+        make install -j4
+        ;;
     *)
         echo "Unknown target arch: \"${1}\""
         exit 1