Auto merge of #73550 - RalfJung:rollup-5huj1k1, r=RalfJung

Rollup of 9 pull requests

Successful merges:

 - #72600 (Properly encode AnonConst into crate metadata)
 - #73055 (remove leftover mentions of `skol` and `int` from the compiler)
 - #73058 (Support sanitizers on aarch64-unknown-linux-gnu)
 - #73171 (RISC-V Emulated Testing)
 - #73404 (Update CFGuard syntax)
 - #73444 (ci: disable alt build during try builds)
 - #73471 (Prevent attacker from manipulating FPU tag word used in SGX enclave)
 - #73539 (Deprecate `Vec::remove_item`)
 - #73543 (Clean up E0695 explanation)

Failed merges:

r? @ghost

Author: bors

.github/workflows/ci.yml

@@ -152,10 +152,6 @@ jobs:
           - name: dist-x86_64-linux
             os: ubuntu-latest-xl
             env: {}
-          - name: dist-x86_64-linux-alt
-            env:
-              IMAGE: dist-x86_64-linux
-            os: ubuntu-latest-xl
     timeout-minutes: 600
     runs-on: "${{ matrix.os }}"
     steps:

src/bootstrap/builder.rs

@@ -1206,7 +1206,7 @@ impl<'a> Builder<'a> {
             );
         }
 
-        // If Control Flow Guard is enabled, pass the `control_flow_guard=checks` flag to rustc
+        // If Control Flow Guard is enabled, pass the `control-flow-guard` flag to rustc
         // when compiling the standard library, since this might be linked into the final outputs
         // produced by rustc. Since this mitigation is only available on Windows, only enable it
         // for the standard library in case the compiler is run on a non-Windows platform.
@@ -1217,7 +1217,7 @@ impl<'a> Builder<'a> {
             && self.config.control_flow_guard
             && compiler.stage >= 1
         {
-            rustflags.arg("-Zcontrol_flow_guard=checks");
+            rustflags.arg("-Zcontrol-flow-guard");
         }
 
         // For `cargo doc` invocations, make rustdoc print the Rust version into the docs

src/bootstrap/configure.py

@@ -141,6 +141,8 @@ def v(*args):
   "rootfs in qemu testing, you probably don't want to use this")
 v("qemu-aarch64-rootfs", "target.aarch64-unknown-linux-gnu.qemu-rootfs",
   "rootfs in qemu testing, you probably don't want to use this")
+v("qemu-riscv64-rootfs", "target.riscv64gc-unknown-linux-gnu.qemu-rootfs",
+  "rootfs in qemu testing, you probably don't want to use this")
 v("experimental-targets", "llvm.experimental-targets",
   "experimental LLVM targets to build")
 v("release-channel", "rust.channel", "the name of the release channel to build")

src/bootstrap/native.rs

@@ -689,48 +689,41 @@ fn supported_sanitizers(
     target: Interned<String>,
     channel: &str,
 ) -> Vec<SanitizerRuntime> {
-    let mut result = Vec::new();
+    let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
+        components
+            .into_iter()
+            .map(move |c| SanitizerRuntime {
+                cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
+                path: out_dir
+                    .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
+                name: format!("librustc-{}_rt.{}.dylib", channel, c),
+            })
+            .collect()
+    };
+
+    let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
+        components
+            .into_iter()
+            .map(move |c| SanitizerRuntime {
+                cmake_target: format!("clang_rt.{}-{}", c, arch),
+                path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
+                name: format!("librustc-{}_rt.{}.a", channel, c),
+            })
+            .collect()
+    };
+
     match &*target {
-        "x86_64-apple-darwin" => {
-            for s in &["asan", "lsan", "tsan"] {
-                result.push(SanitizerRuntime {
-                    cmake_target: format!("clang_rt.{}_osx_dynamic", s),
-                    path: out_dir
-                        .join(&format!("build/lib/darwin/libclang_rt.{}_osx_dynamic.dylib", s)),
-                    name: format!("librustc-{}_rt.{}.dylib", channel, s),
-                });
-            }
+        "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
+        "aarch64-unknown-linux-gnu" => {
+            common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan"])
         }
+        "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
+        "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
         "x86_64-unknown-linux-gnu" => {
-            for s in &["asan", "lsan", "msan", "tsan"] {
-                result.push(SanitizerRuntime {
-                    cmake_target: format!("clang_rt.{}-x86_64", s),
-                    path: out_dir.join(&format!("build/lib/linux/libclang_rt.{}-x86_64.a", s)),
-                    name: format!("librustc-{}_rt.{}.a", channel, s),
-                });
-            }
-        }
-        "x86_64-fuchsia" => {
-            for s in &["asan"] {
-                result.push(SanitizerRuntime {
-                    cmake_target: format!("clang_rt.{}-x86_64", s),
-                    path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-x86_64.a", s)),
-                    name: format!("librustc-{}_rt.{}.a", channel, s),
-                });
-            }
-        }
-        "aarch64-fuchsia" => {
-            for s in &["asan"] {
-                result.push(SanitizerRuntime {
-                    cmake_target: format!("clang_rt.{}-aarch64", s),
-                    path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-aarch64.a", s)),
-                    name: format!("librustc-{}_rt.{}.a", channel, s),
-                });
-            }
+            common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
         }
-        _ => {}
+        _ => Vec::new(),
     }
-    result
 }
 
 struct HashStamp {

src/ci/azure-pipelines/try.yml

@@ -26,8 +26,6 @@ jobs:
   strategy:
     matrix:
       dist-x86_64-linux: {}
-      dist-x86_64-linux-alt:
-        IMAGE: dist-x86_64-linux
 
 # The macOS and Windows builds here are currently disabled due to them not being
 # overly necessary on `try` builds. We also don't actually have anything that

src/ci/docker/disabled/riscv64gc-linux/0001-Remove-stime-function-calls.patch

@@ -0,0 +1,96 @@
+From c820da85c65c7f3aa9e9cb3ed71ada69bf9b783e Mon Sep 17 00:00:00 2001
+From: Alistair Francis <[email protected]>
+Date: Tue, 19 Nov 2019 13:06:40 +0100
+Subject: [PATCH] Remove stime() function calls
+
+stime() has been deprecated in glibc 2.31 and replaced with
+clock_settime(). Let's replace the stime() function calls with
+clock_settime() in preperation.
+
+function                                             old     new   delta
+rdate_main                                           197     224     +27
+clock_settime                                          -      27     +27
+date_main                                            926     941     +15
+stime                                                 37       -     -37
+------------------------------------------------------------------------------
+(add/remove: 2/2 grow/shrink: 2/0 up/down: 69/-37)             Total: 32 bytes
+
+Signed-off-by: Alistair Francis <[email protected]>
+Signed-off-by: Denys Vlasenko <[email protected]>
+
+[Tom Eccles: adjust patch context to apply on top of 1.31.1-stable]
+Signed-off-by: Tom Eccles <[email protected]>
+---
+ coreutils/date.c         | 6 +++++-
+ libbb/missing_syscalls.c | 8 --------
+ util-linux/rdate.c       | 8 ++++++--
+ 3 files changed, 11 insertions(+), 11 deletions(-)
+
+diff --git a/coreutils/date.c b/coreutils/date.c
+index 3414d38ae..4ade6abb4 100644
+--- a/coreutils/date.c
++++ b/coreutils/date.c
+@@ -279,6 +279,9 @@ int date_main(int argc UNUSED_PARAM, char **argv)
+ 		time(&ts.tv_sec);
+ #endif
+ 	}
++#if !ENABLE_FEATURE_DATE_NANO
++	ts.tv_nsec = 0;
++#endif
+ 	localtime_r(&ts.tv_sec, &tm_time);
+ 
+ 	/* If date string is given, update tm_time, and maybe set date */
+@@ -301,9 +304,10 @@ int date_main(int argc UNUSED_PARAM, char **argv)
+ 		if (date_str[0] != '@')
+ 			tm_time.tm_isdst = -1;
+ 		ts.tv_sec = validate_tm_time(date_str, &tm_time);
++		ts.tv_nsec = 0;
+ 
+ 		/* if setting time, set it */
+-		if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
++		if ((opt & OPT_SET) && clock_settime(CLOCK_REALTIME, &ts) < 0) {
+ 			bb_perror_msg("can't set date");
+ 		}
+ 	}
+diff --git a/libbb/missing_syscalls.c b/libbb/missing_syscalls.c
+index 87cf59b3d..dc40d9155 100644
+--- a/libbb/missing_syscalls.c
++++ b/libbb/missing_syscalls.c
+@@ -15,14 +15,6 @@ pid_t getsid(pid_t pid)
+ 	return syscall(__NR_getsid, pid);
+ }
+ 
+-int stime(const time_t *t)
+-{
+-	struct timeval tv;
+-	tv.tv_sec = *t;
+-	tv.tv_usec = 0;
+-	return settimeofday(&tv, NULL);
+-}
+-
+ int sethostname(const char *name, size_t len)
+ {
+ 	return syscall(__NR_sethostname, name, len);
+diff --git a/util-linux/rdate.c b/util-linux/rdate.c
+index 70f829e7f..878375d78 100644
+--- a/util-linux/rdate.c
++++ b/util-linux/rdate.c
+@@ -95,9 +95,13 @@ int rdate_main(int argc UNUSED_PARAM, char **argv)
+ 	if (!(flags & 2)) { /* no -p (-s may be present) */
+ 		if (time(NULL) == remote_time)
+ 			bb_error_msg("current time matches remote time");
+-		else
+-			if (stime(&remote_time) < 0)
++		else {
++			struct timespec ts;
++			ts.tv_sec = remote_time;
++			ts.tv_nsec = 0;
++			if (clock_settime(CLOCK_REALTIME, &ts) < 0)
+ 				bb_perror_msg_and_die("can't set time of day");
++		}
+ 	}
+ 
+ 	if (flags != 1) /* not lone -s */
+-- 
+2.25.1
+

src/ci/docker/disabled/riscv64gc-linux/Dockerfile

@@ -0,0 +1,102 @@
+# based on armhf-gnu/Dockerfile
+FROM ubuntu:20.04
+
+RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
+RUN apt-get update -y && apt-get install -y --no-install-recommends \
+    bc \
+    bison \
+    ca-certificates \
+    cmake \
+    cpio \
+    curl \
+    debian-ports-archive-keyring \
+    debootstrap \
+    flex \
+    gcc \
+    gcc-riscv64-linux-gnu \
+    git \
+    g++-riscv64-linux-gnu \
+    g++ \
+    libc6-dev \
+    libc6-dev-riscv64-cross \
+    make \
+    patch \
+    python3 \
+    qemu-system-misc \
+    xz-utils
+
+ENV ARCH=riscv
+ENV CROSS_COMPILE=riscv64-linux-gnu-
+
+WORKDIR /build
+
+# From https://github.com/michaeljclark/busybear-linux/blob/master/conf/linux.config
+COPY riscv64gc-linux/linux.config /build
+
+# Compile the kernel that we're going to be emulating with. This is
+# basically just done to be compatible with the QEMU target that we're going
+# to be using when running tests.
+RUN curl https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.16.tar.xz | tar xJf - && \
+    cp linux.config linux-5.6.16/.config && \
+    cd /build/linux-5.6.16 && \
+    make olddefconfig && \
+    make -j$(nproc) vmlinux
+RUN cp linux-5.6.16/vmlinux /tmp
+RUN rm -rf linux-5.6.16
+
+# Compile an instance of busybox as this provides a lightweight system and init
+# binary which we will boot into. Only trick here is configuring busybox to
+# build static binaries.
+RUN curl https://busybox.net/downloads/busybox-1.31.1.tar.bz2 | tar xjf -
+COPY riscv64gc-linux/0001-Remove-stime-function-calls.patch /build/busybox-1.31.1/
+RUN cd /build/busybox-1.31.1 && \
+    patch -p1 -i 0001-Remove-stime-function-calls.patch && \
+    make defconfig && \
+    sed -i 's/.*CONFIG_STATIC.*/CONFIG_STATIC=y/' .config && \
+    make -j$(nproc) && \
+    make install && \
+    mv _install /tmp/rootfs && \
+    cd /build && \
+    rm -rf busybox-1.31.1
+
+# Download the ubuntu rootfs, which we'll use as a chroot for all our tests
+# This is only needed to provide /lib/* and /usr/lib/*
+WORKDIR /tmp
+RUN debootstrap --variant=minbase --arch=riscv64 --foreign focal /tmp/rootfs/ubuntu
+RUN cd rootfs && mkdir proc sys dev etc etc/init.d
+# rootfs/ubuntu/proc is in a weird state (access fails with ELOOP) until
+# rootfs/ubuntu/debootstrap/debootstrap --second-stage is run (under emulation),
+# but this takes ages. Instead hack it into a good enough state.
+# /proc is used by std::env::current_exe() (which is roughly
+# `readlink /proc/self/exe`)
+RUN cd rootfs/ubuntu && rm -rf proc && mkdir proc
+
+# Copy over our init script, which starts up our test server and also a few other
+# misc tasks
+COPY scripts/qemu-bare-bones-rcS rootfs/etc/init.d/rcS
+RUN chmod +x rootfs/etc/init.d/rcS
+
+# Helper to quickly fill the entropy pool in the kernel
+COPY scripts/qemu-bare-bones-addentropy.c /tmp/addentropy.c
+RUN riscv64-linux-gnu-gcc addentropy.c -o rootfs/addentropy -static
+
+# download and build the riscv bootloader
+RUN git clone https://github.com/riscv/riscv-pk
+WORKDIR /tmp/riscv-pk
+# nothing special about this revision: it is just master at the time of writing
+# v1.0.0 doesn't build
+RUN git checkout 5d9ed238e1cabfbca3c47f50d32894ce94bfc304
+RUN mkdir build && cd build && \
+    ../configure --with-payload=/tmp/vmlinux --host=riscv64-linux-gnu && \
+    make -j$(nproc) && \
+    cp bbl /tmp
+WORKDIR /tmp
+RUN rm -rf /tmp/riscv-pk
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV RUST_CONFIGURE_ARGS --qemu-riscv64-rootfs=/tmp/rootfs
+ENV SCRIPT python3 ../x.py test --target riscv64gc-unknown-linux-gnu
+
+ENV NO_CHANGE_USER=1

src/ci/docker/disabled/riscv64gc-linux/linux.config

@@ -0,0 +1,51 @@
+CONFIG_DEFAULT_HOSTNAME="busybear"
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_CGROUPS=y
+CONFIG_CGROUP_SCHED=y
+CONFIG_CFS_BANDWIDTH=y
+CONFIG_CGROUP_BPF=y
+CONFIG_NAMESPACES=y
+CONFIG_USER_NS=y
+CONFIG_CHECKPOINT_RESTORE=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_EXPERT=y
+CONFIG_BPF_SYSCALL=y
+CONFIG_SMP=y
+CONFIG_MODULES=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_PACKET_DIAG=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_NETLINK_DIAG=y
+# CONFIG_WIRELESS is not set
+CONFIG_PCI=y
+CONFIG_DEVTMPFS=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
+# CONFIG_ETHERNET is not set
+# CONFIG_WLAN is not set
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_HVC_RISCV_SBI=y
+# CONFIG_HW_RANDOM is not set
+# CONFIG_USB_SUPPORT is not set
+CONFIG_VIRTIO_MMIO=y
+CONFIG_SIFIVE_PLIC=y
+CONFIG_RAS=y
+CONFIG_EXT2_FS=y
+CONFIG_EXT3_FS=y
+CONFIG_EXT4_FS_POSIX_ACL=y
+CONFIG_AUTOFS4_FS=y
+CONFIG_MSDOS_FS=y
+CONFIG_VFAT_FS=y
+CONFIG_TMPFS=y
+# CONFIG_CRYPTO_ECHAINIV is not set
+# CONFIG_CRYPTO_HW is not set
+CONFIG_PRINTK_TIME=y

src/ci/docker/dist-aarch64-linux/Dockerfile

@@ -35,5 +35,6 @@ ENV HOSTS=aarch64-unknown-linux-gnu
 ENV RUST_CONFIGURE_ARGS \
       --enable-full-tools \
       --enable-profiler \
+      --enable-sanitizers \
       --disable-docs
 ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/github-actions/ci.yml

@@ -281,11 +281,6 @@ jobs:
           - name: dist-x86_64-linux
             <<: *job-linux-xl
 
-          - name: dist-x86_64-linux-alt
-            env:
-              IMAGE: dist-x86_64-linux
-            <<: *job-linux-xl
-
   auto:
     <<: *base-ci-job
     name: auto