Rollup merge of rust-lang#63107 - adrian-budau:master, r=alexcrichton

Added support for armv7-unknown-linux-gnueabi/musleabi

Fixes rust-lang#63101

Some things that are not done and I hope someone can help me with:

* During the ci build of `armv7-unknown-linux-gnueabi` `openssl` must be built (to build cargo) but `openssl` does not yet support this target. This feels slightly like a chicken-and-egg problem, any feedback is welcome.
* Should I add any tests for any of these targets?

src/bootstrap/configure.py

@@ -125,7 +125,9 @@ def v(*args):
   "arm-unknown-linux-musleabihf install directory")
 v("musl-root-armv5te", "target.armv5te-unknown-linux-musleabi.musl-root",
   "armv5te-unknown-linux-musleabi install directory")
-v("musl-root-armv7", "target.armv7-unknown-linux-musleabihf.musl-root",
+v("musl-root-armv7", "target.armv7-unknown-linux-musleabi.musl-root",
+  "armv7-unknown-linux-musleabi install directory")
+v("musl-root-armv7hf", "target.armv7-unknown-linux-musleabihf.musl-root",
   "armv7-unknown-linux-musleabihf install directory")
 v("musl-root-aarch64", "target.aarch64-unknown-linux-musl.musl-root",
   "aarch64-unknown-linux-musl install directory")

src/ci/docker/dist-various-1/Dockerfile

@@ -64,7 +64,7 @@ RUN env \
     env \
     CC=arm-linux-gnueabihf-gcc CFLAGS="-march=armv7-a" \
     CXX=arm-linux-gnueabihf-g++ CXXFLAGS="-march=armv7-a" \
-    bash musl.sh armv7 && \
+    bash musl.sh armv7hf && \
     env \
     CC=aarch64-linux-gnu-gcc \
     CXX=aarch64-linux-gnu-g++ \
@@ -137,7 +137,7 @@ ENV RUST_CONFIGURE_ARGS \
       --musl-root-armv5te=/musl-armv5te \
       --musl-root-arm=/musl-arm \
       --musl-root-armhf=/musl-armhf \
-      --musl-root-armv7=/musl-armv7 \
+      --musl-root-armv7hf=/musl-armv7hf \
       --musl-root-aarch64=/musl-aarch64 \
       --musl-root-mips=/musl-mips \
       --musl-root-mipsel=/musl-mipsel \

src/ci/docker/dist-various-2/Dockerfile

@@ -8,7 +8,8 @@ RUN sed -i 's/^# deb-src/deb-src/' /etc/apt/sources.list
 
 RUN apt-get update && apt-get build-dep -y clang llvm && apt-get install -y --no-install-recommends \
   build-essential \
-  gcc-multilib \
+# gcc-multilib can not be installed together with gcc-arm-linux-gnueabi
+  gcc-7-multilib \
   libedit-dev \
   libgmp-dev \
   libisl-dev \
@@ -21,11 +22,20 @@ RUN apt-get update && apt-get build-dep -y clang llvm && apt-get install -y --no
   unzip \
   # Needed for apt-key to work:
   dirmngr \
-  gpg-agent
+  gpg-agent \
+  g++-7-arm-linux-gnueabi
 
 RUN apt-key adv --batch --yes --keyserver keyserver.ubuntu.com --recv-keys 74DA7924C5513486
 RUN add-apt-repository -y 'deb http://apt.dilos.org/dilos dilos2 main'
 
+WORKDIR /build
+COPY scripts/musl.sh /build
+RUN env \
+    CC=arm-linux-gnueabi-gcc-7 CFLAGS="-march=armv7-a" \
+    CXX=arm-linux-gnueabi-g++-7 CXXFLAGS="-march=armv7-a" \
+    bash musl.sh armv7 && \
+    rm -rf /build/*
+
 WORKDIR /tmp
 COPY dist-various-2/shared.sh /tmp/
 COPY dist-various-2/build-cloudabi-toolchain.sh /tmp/
@@ -58,7 +68,11 @@ ENV \
     CXX_sparcv9_sun_solaris=sparcv9-sun-solaris2.10-g++ \
     AR_x86_64_sun_solaris=x86_64-sun-solaris2.10-ar \
     CC_x86_64_sun_solaris=x86_64-sun-solaris2.10-gcc \
-    CXX_x86_64_sun_solaris=x86_64-sun-solaris2.10-g++
+    CXX_x86_64_sun_solaris=x86_64-sun-solaris2.10-g++ \
+    CC_armv7_unknown_linux_gnueabi=arm-linux-gnueabi-gcc-7 \
+    CXX_armv7_unknown_linux_gnueabi=arm-linux-gnueabi-g++-7 \
+    CC=gcc-7 \
+    CXX=g++-7
 
 ENV CARGO_TARGET_X86_64_FUCHSIA_AR /usr/local/bin/llvm-ar
 ENV CARGO_TARGET_X86_64_FUCHSIA_RUSTFLAGS \
@@ -81,9 +95,19 @@ ENV TARGETS=$TARGETS,x86_64-unknown-linux-gnux32
 ENV TARGETS=$TARGETS,x86_64-unknown-cloudabi
 ENV TARGETS=$TARGETS,x86_64-fortanix-unknown-sgx
 ENV TARGETS=$TARGETS,nvptx64-nvidia-cuda
+ENV TARGETS=$TARGETS,armv7-unknown-linux-gnueabi
+ENV TARGETS=$TARGETS,armv7-unknown-linux-musleabi
 
 ENV X86_FORTANIX_SGX_LIBS="/x86_64-fortanix-unknown-sgx/lib/"
 
+# As per https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1300211
+# we need asm in the search path for gcc-7 (for gnux32) but not in the search path of the
+# cross compilers.
+# Luckily one of the folders is /usr/local/include so symlink /usr/include/asm-generic there
+RUN ln -s /usr/include/asm-generic /usr/local/include/asm
+
 ENV RUST_CONFIGURE_ARGS --enable-extended --enable-lld --disable-docs \
-  --set target.wasm32-wasi.wasi-root=/wasm32-wasi
+  --set target.wasm32-wasi.wasi-root=/wasm32-wasi \
+  --musl-root-armv7=/musl-armv7
+
 ENV SCRIPT python2.7 ../x.py dist --target $TARGETS

src/librustc_target/spec/armv7_unknown_linux_gnueabi.rs

@@ -0,0 +1,29 @@
+use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
+
+// This target is for glibc Linux on ARMv7 without thumb-mode, NEON or
+// hardfloat.
+
+pub fn target() -> TargetResult {
+    let base = super::linux_base::opts();
+    Ok(Target {
+        llvm_target: "armv7-unknown-linux-gnueabi".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
+        arch: "arm".to_string(),
+        target_os: "linux".to_string(),
+        target_env: "gnu".to_string(),
+        target_vendor: "unknown".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+
+        options: TargetOptions {
+            features: "+v7,+thumb2,+soft-float,-neon".to_string(),
+            cpu: "generic".to_string(),
+            max_atomic_width: Some(64),
+            abi_blacklist: super::arm_base::abi_blacklist(),
+            target_mcount: "\u{1}__gnu_mcount_nc".to_string(),
+            .. base
+        }
+    })
+}

src/librustc_target/spec/armv7_unknown_linux_musleabi.rs

@@ -0,0 +1,34 @@
+use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
+
+// This target is for musl Linux on ARMv7 without thumb-mode, NEON or
+// hardfloat.
+
+pub fn target() -> TargetResult {
+    let base = super::linux_musl_base::opts();
+    // Most of these settings are copied from the armv7_unknown_linux_gnueabi
+    // target.
+    Ok(Target {
+        // It's important we use "gnueabi" and not "musleabi" here. LLVM uses it
+        // to determine the calling convention and float ABI, and it doesn't
+        // support the "musleabi" value.
+        llvm_target: "armv7-unknown-linux-gnueabi".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
+        arch: "arm".to_string(),
+        target_os: "linux".to_string(),
+        target_env: "musl".to_string(),
+        target_vendor: "unknown".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+
+        options: TargetOptions {
+            features: "+v7,+thumb2,+soft-float,-neon".to_string(),
+            cpu: "generic".to_string(),
+            max_atomic_width: Some(64),
+            abi_blacklist: super::arm_base::abi_blacklist(),
+            target_mcount: "\u{1}mcount".to_string(),
+            .. base
+        }
+    })
+}

src/librustc_target/spec/mod.rs

@@ -359,8 +359,10 @@ supported_targets! {
     ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
     ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
     ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
+    ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
     ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
     ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
+    ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
     ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
     ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
     ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),

src/tools/build-manifest/src/main.rs

@@ -56,8 +56,10 @@ static TARGETS: &[&str] = &[
     "armv7-apple-ios",
     "armv7-linux-androideabi",
     "thumbv7neon-linux-androideabi",
+    "armv7-unknown-linux-gnueabi",
     "armv7-unknown-linux-gnueabihf",
     "thumbv7neon-unknown-linux-gnueabihf",
+    "armv7-unknown-linux-musleabi",
     "armv7-unknown-linux-musleabihf",
     "armebv7r-none-eabi",
     "armebv7r-none-eabihf",