Downgrade CI support for MIPS

Author: JohnTitor

.github/workflows/bors.yml

@@ -136,13 +136,6 @@ jobs:
           asmjs-unknown-emscripten,
           i686-linux-android,
           i686-unknown-linux-musl,
-          mips-unknown-linux-gnu,
-          mips-unknown-linux-musl,
-          # FIXME: Somehow failed on CI
-          # https://github.com/rust-lang/libc/runs/1659882216
-          # mips64-unknown-linux-gnuabi64,
-          # mips64el-unknown-linux-gnuabi64,
-          mipsel-unknown-linux-musl,
           powerpc-unknown-linux-gnu,
           powerpc64-unknown-linux-gnu,
           powerpc64le-unknown-linux-gnu,

ci/build.sh

@@ -112,14 +112,6 @@ x86_64-unknown-linux-musl \
 x86_64-unknown-netbsd \
 "
 
-# FIXME: builds of MIPS targets are currently broken on nightly.
-# mips-unknown-linux-gnu \
-# mips-unknown-linux-musl \
-# mips64-unknown-linux-gnuabi64 \
-# mips64el-unknown-linux-gnuabi64 \
-# mipsel-unknown-linux-gnu \
-# mipsel-unknown-linux-musl \
-
 RUST_GT_1_13_LINUX_TARGETS="\
 arm-unknown-linux-musleabi \
 arm-unknown-linux-musleabihf \
@@ -238,9 +230,15 @@ i686-unknown-haiku \
 i686-unknown-netbsd \
 i686-unknown-openbsd \
 i686-wrs-vxworks \
-mipsel-sony-psp \
+mips-unknown-linux-gnu \
+mips-unknown-linux-musl \
+mips64-unknown-linux-gnuabi64 \
 mips64-unknown-linux-muslabi64 \
+mips64el-unknown-linux-gnuabi64 \
 mips64el-unknown-linux-muslabi64 \
+mipsel-unknown-linux-gnu \
+mipsel-unknown-linux-musl \
+mipsel-sony-psp \
 nvptx64-nvidia-cuda \
 powerpc-unknown-linux-gnuspe \
 powerpc-unknown-netbsd \

ci/docker/mips-unknown-linux-gnu/Dockerfile

@@ -46,20 +46,6 @@ case ${1} in
         ./configure --prefix="/musl-${musl_arch}"
         make install -j4
         ;;
-    mips64)
-        musl_arch=mips64
-        kernel_arch=mips
-        CC=mips64-linux-gnuabi64-gcc CFLAGS="-march=mips64r2 -mabi=64" \
-          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
-        make install -j4
-        ;;
-    mips64el)
-        musl_arch=mips64el
-        kernel_arch=mips
-        CC=mips64el-linux-gnuabi64-gcc CFLAGS="-march=mips64r2 -mabi=64" \
-          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
-        make install -j4
-        ;;
     s390x)
         musl_arch=s390x
         kernel_arch=s390

ci/docker/mips-unknown-linux-musl/Dockerfile

@@ -12,9 +12,6 @@ else
   # https://github.com/rust-lang/rust/issues/103673 contains related information.
   case "$TARGET" in
     *android*) toolchain=nightly-2022-10-09;;
-    # FIXME: Unpin once mips' components are available on nightly.
-    # https://rust-lang.github.io/rustup-components-history/mips-unknown-linux-gnu.html
-    *mips*) toolchain=nightly-2023-07-04;;
     *) toolchain=nightly;;
   esac
 fi

ci/docker/mips64-unknown-linux-gnuabi64/Dockerfile

@@ -3222,9 +3222,6 @@ fn test_linux(target: &str) {
 
     let arm = target.contains("arm");
     let i686 = target.contains("i686");
-    let mips = target.contains("mips");
-    let mips32 = mips && !target.contains("64");
-    let mips64 = mips && target.contains("64");
     let ppc = target.contains("powerpc");
     let ppc64 = target.contains("powerpc64");
     let s390x = target.contains("s390x");
@@ -3707,16 +3704,11 @@ fn test_linux(target: &str) {
             | "IPPROTO_ETHERNET"
             | "IPPROTO_MPTCP" => true,
 
-            // FIXME: Not currently available in headers
-            "P_PIDFD" if mips => true,
-            "SYS_pidfd_open" if mips => true,
+            // FIXME: Not yet implemented on sparc64
+            "SYS_clone3" if sparc64 => true,
 
-            // FIXME: Not currently available in headers on MIPS
-            // Not yet implemented on sparc64
-            "SYS_clone3" if mips | sparc64 => true,
-
-            // FIXME: Not defined on ARM, gnueabihf, MIPS, musl, PowerPC, riscv64, s390x, and sparc64.
-            "SYS_memfd_secret" if arm | gnueabihf | mips | musl | ppc | riscv64 | s390x | sparc64 => true,
+            // FIXME: Not defined on ARM, gnueabihf, musl, PowerPC, riscv64, s390x, and sparc64.
+            "SYS_memfd_secret" if arm | gnueabihf | musl | ppc | riscv64 | s390x | sparc64 => true,
 
             // FIXME: Added in Linux 5.16
             // https://github.com/torvalds/linux/commit/039c0ec9bb77446d7ada7f55f90af9299b28ca49
@@ -3734,10 +3726,10 @@ fn test_linux(target: &str) {
             | "UINPUT_VERSION"
             | "SW_MAX"
             | "SW_CNT"
-                if mips || ppc64 || riscv64 => true,
+                if ppc64 || riscv64 => true,
 
             // FIXME: Not currently available in headers on ARM, MIPS and musl.
-            "NETLINK_GET_STRICT_CHK" if arm || mips || musl => true,
+            "NETLINK_GET_STRICT_CHK" if arm || musl => true,
 
             // kernel constants not available in uclibc 1.0.34
             | "EXTPROC"
@@ -4104,15 +4096,11 @@ fn test_linux(target: &str) {
     });
 
     cfg.skip_roundtrip(move |s| match s {
-        // FIXME:
-        "utsname" if mips32 || mips64 => true,
         // FIXME:
         "mcontext_t" if s390x => true,
         // FIXME: This is actually a union.
         "fpreg_t" if s390x => true,
 
-        "sockaddr_un" | "sembuf" | "ff_constant_effect" if mips32 && (gnu || musl) => true,
-
         // The test doesn't work on some env:
         "ipv6_mreq"
         | "ip_mreq_source"
@@ -4132,7 +4120,7 @@ fn test_linux(target: &str) {
         | "sockaddr_nl"
         | "termios"
         | "nlmsgerr"
-            if (mips64 || sparc64) && gnu =>
+            if sparc64 && gnu =>
         {
             true
         }
@@ -4145,7 +4133,7 @@ fn test_linux(target: &str) {
         "cmsghdr" => true,
 
         // FIXME: the call ABI of max_align_t is incorrect on these platforms:
-        "max_align_t" if i686 || mips64 || ppc64 => true,
+        "max_align_t" if i686 || ppc64 => true,
 
         _ => false,
     });