Change gcc-multilib to use i686 gcc compiler.

Author: Alexhuszagh

docker/Dockerfile.i586-unknown-linux-gnu

@@ -11,12 +11,24 @@ COPY xargo.sh /
 RUN /xargo.sh
 
 RUN apt-get update && apt-get install --assume-yes --no-install-recommends \
-    g++-multilib
+    g++-i686-linux-gnu \
+    libc6-dev-i386-cross
+
+COPY deny-debian-packages.sh /
+RUN TARGET_ARCH=i386 /deny-debian-packages.sh \
+    binutils \
+    binutils-i686-linux-gnu
 
 COPY qemu.sh /
 RUN /qemu.sh i386
 
 COPY qemu-runner /
 
-ENV CARGO_TARGET_I586_UNKNOWN_LINUX_GNU_RUNNER="/qemu-runner i586" \
+ENV CARGO_TARGET_I586_UNKNOWN_LINUX_GNU_LINKER=i686-linux-gnu-gcc \
+    CARGO_TARGET_I586_UNKNOWN_LINUX_GNU_RUNNER="/qemu-runner i586" \
+    CC_i586_unknown_linux_gnu=i686-linux-gnu-gcc \
+    CXX_i586_unknown_linux_gnu=i686-linux-gnu-g++ \
+    BINDGEN_EXTRA_CLANG_ARGS_i586_unknown_linux_gnu="--sysroot=/usr/i686-linux-gnu" \
+    QEMU_LD_PREFIX=/usr/i686-linux-gnu \
+    RUST_TEST_THREADS=1 \
     PKG_CONFIG_PATH="/usr/lib/i386-linux-gnu/pkgconfig/:${PKG_CONFIG_PATH}"

docker/Dockerfile.i686-unknown-linux-gnu

@@ -11,7 +11,13 @@ COPY xargo.sh /
 RUN /xargo.sh
 
 RUN apt-get update && apt-get install --assume-yes --no-install-recommends \
-    g++-multilib
+    g++-i686-linux-gnu \
+    libc6-dev-i386-cross
+
+COPY deny-debian-packages.sh /
+RUN TARGET_ARCH=i386 /deny-debian-packages.sh \
+    binutils \
+    binutils-i686-linux-gnu
 
 COPY qemu.sh /
 RUN /qemu.sh i386 softmmu
@@ -24,5 +30,11 @@ RUN /linux-image.sh i686
 
 COPY linux-runner /
 
-ENV CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_RUNNER="/linux-runner i686" \
+ENV CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER=i686-linux-gnu-gcc \
+    CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_RUNNER="/linux-runner i686" \
+    CC_i686_unknown_linux_gnu=i686-linux-gnu-gcc \
+    CXX_i686_unknown_linux_gnu=i686-linux-gnu-g++ \
+    BINDGEN_EXTRA_CLANG_ARGS_i686_unknown_linux_gnu="--sysroot=/usr/i686-linux-gnu" \
+    QEMU_LD_PREFIX=/usr/i686-linux-gnu \
+    RUST_TEST_THREADS=1 \
     PKG_CONFIG_PATH="/usr/lib/i386-linux-gnu/pkgconfig/:${PKG_CONFIG_PATH}"

src/docker/remote.rs

@@ -865,6 +865,10 @@ pub(crate) fn run(
 
     let mount_prefix = MOUNT_PREFIX;
 
+    if options.in_docker() {
+        msg_info.warn("remote and docker-in-docker are unlikely to work together when using cross. remote cross uses data volumes, so docker-in-docker should not be required.")?;
+    }
+
     // the logic is broken into the following steps
     // 1. get our unique identifiers and cleanup from a previous run.
     // 2. if not using persistent volumes, create a data volume