Remove --host and --target arguments to configure

These arguments are passed to the relevant x.py invocation in all cases
anyway. As such, there is no need to separately configure them. x.py
will ignore the configuration when they are passed on the command line
anyway.

src/ci/docker/arm-android/Dockerfile

@@ -31,9 +31,7 @@ ENV PATH=$PATH:/android/sdk/platform-tools
 
 ENV TARGETS=arm-linux-androideabi
 
-ENV RUST_CONFIGURE_ARGS \
-      --target=$TARGETS \
-      --arm-linux-androideabi-ndk=/android/ndk/arm-14
+ENV RUST_CONFIGURE_ARGS --arm-linux-androideabi-ndk=/android/ndk/arm-14
 
 ENV SCRIPT python2.7 ../x.py test --target $TARGETS
 

src/ci/docker/armhf-gnu/Dockerfile

@@ -76,9 +76,7 @@ RUN curl -O http://ftp.nl.debian.org/debian/dists/jessie/main/installer-armhf/cu
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-ENV RUST_CONFIGURE_ARGS \
-      --target=arm-unknown-linux-gnueabihf \
-      --qemu-armhf-rootfs=/tmp/rootfs
+ENV RUST_CONFIGURE_ARGS --qemu-armhf-rootfs=/tmp/rootfs
 ENV SCRIPT python2.7 ../x.py test --target arm-unknown-linux-gnueabihf
 
 ENV NO_CHANGE_USER=1

src/ci/docker/asmjs/Dockerfile

@@ -29,6 +29,6 @@ ENV EM_CONFIG=/emsdk-portable/.emscripten
 
 ENV TARGETS=asmjs-unknown-emscripten
 
-ENV RUST_CONFIGURE_ARGS --target=$TARGETS --enable-emscripten
+ENV RUST_CONFIGURE_ARGS --enable-emscripten
 
 ENV SCRIPT python2.7 ../x.py test --target $TARGETS

src/ci/docker/disabled/aarch64-gnu/Dockerfile

@@ -74,7 +74,6 @@ COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
 ENV RUST_CONFIGURE_ARGS \
-      --target=aarch64-unknown-linux-gnu \
       --qemu-aarch64-rootfs=/tmp/rootfs
 ENV SCRIPT python2.7 ../x.py test --target aarch64-unknown-linux-gnu
 ENV NO_CHANGE_USER=1

src/ci/docker/disabled/dist-aarch64-android/Dockerfile

@@ -14,8 +14,6 @@ ENV DEP_Z_ROOT=/android/ndk/arm64-21/sysroot/usr/
 ENV HOSTS=aarch64-linux-android
 
 ENV RUST_CONFIGURE_ARGS \
-      --host=$HOSTS \
-      --target=$HOSTS \
       --aarch64-linux-android-ndk=/android/ndk/arm64-21 \
       --disable-rpath \
       --enable-extended \

src/ci/docker/disabled/dist-armv7-android/Dockerfile

@@ -20,8 +20,6 @@ ENV DEP_Z_ROOT=/android/ndk/arm-14/sysroot/usr/
 ENV HOSTS=armv7-linux-androideabi
 
 ENV RUST_CONFIGURE_ARGS \
-      --host=$HOSTS \
-      --target=$HOSTS \
       --armv7-linux-androideabi-ndk=/android/ndk/arm \
       --disable-rpath \
       --enable-extended \

src/ci/docker/disabled/dist-i686-android/Dockerfile

@@ -20,8 +20,6 @@ ENV DEP_Z_ROOT=/android/ndk/x86-14/sysroot/usr/
 ENV HOSTS=i686-linux-android
 
 ENV RUST_CONFIGURE_ARGS \
-      --host=$HOSTS \
-      --target=$HOSTS \
       --i686-linux-android-ndk=/android/ndk/x86 \
       --disable-rpath \
       --enable-extended \

src/ci/docker/disabled/dist-x86_64-android/Dockerfile

@@ -14,8 +14,6 @@ ENV DEP_Z_ROOT=/android/ndk/x86_64-21/sysroot/usr/
 ENV HOSTS=x86_64-linux-android
 
 ENV RUST_CONFIGURE_ARGS \
-      --host=$HOSTS \
-      --target=$HOSTS \
       --x86_64-linux-android-ndk=/android/ndk/x86_64-21 \
       --disable-rpath \
       --enable-extended \

src/ci/docker/disabled/dist-x86_64-dragonfly/Dockerfile

@@ -32,5 +32,5 @@ ENV \
 
 ENV HOSTS=x86_64-unknown-dragonfly
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/disabled/dist-x86_64-haiku/Dockerfile

@@ -42,8 +42,8 @@ RUN sh /scripts/sccache.sh
 ENV HOST=x86_64-unknown-haiku
 ENV TARGET=target.$HOST
 
-ENV RUST_CONFIGURE_ARGS --host=$HOST --target=$HOST --disable-jemalloc \
+ENV RUST_CONFIGURE_ARGS --disable-jemalloc \
   --set=$TARGET.cc=x86_64-unknown-haiku-gcc \
   --set=$TARGET.cxx=x86_64-unknown-haiku-g++ \
   --set=$TARGET.llvm-config=/bin/llvm-config-haiku
-ENV SCRIPT python2.7 ../x.py dist
+ENV SCRIPT python2.7 ../x.py dist --host=$HOST --target=$HOST

src/ci/docker/disabled/dist-x86_64-redox/Dockerfile

@@ -18,5 +18,5 @@ ENV \
     CC_x86_64_unknown_redox=x86_64-unknown-redox-gcc \
     CXX_x86_64_unknown_redox=x86_64-unknown-redox-g++
 
-ENV RUST_CONFIGURE_ARGS --target=x86_64-unknown-redox --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --target x86_64-unknown-redox

src/ci/docker/disabled/wasm32-exp/Dockerfile

@@ -30,6 +30,6 @@ ENV EM_CONFIG=/root/.emscripten
 
 ENV TARGETS=wasm32-experimental-emscripten
 
-ENV RUST_CONFIGURE_ARGS --target=$TARGETS --experimental-targets=WebAssembly
+ENV RUST_CONFIGURE_ARGS --experimental-targets=WebAssembly
 
 ENV SCRIPT python2.7 ../x.py test --target $TARGETS

src/ci/docker/disabled/wasm32/Dockerfile

@@ -29,7 +29,4 @@ ENV BINARYEN_ROOT=/emsdk-portable/clang/e1.37.13_64bit/binaryen/
 ENV EM_CONFIG=/emsdk-portable/.emscripten
 
 ENV TARGETS=wasm32-unknown-emscripten
-
-ENV RUST_CONFIGURE_ARGS --target=$TARGETS
-
 ENV SCRIPT python2.7 ../x.py test --target $TARGETS

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

@@ -32,5 +32,5 @@ ENV CC_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnueabi-gcc \
 
 ENV HOSTS=aarch64-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-android/Dockerfile

@@ -21,7 +21,6 @@ ENV TARGETS=$TARGETS,aarch64-linux-android
 ENV TARGETS=$TARGETS,x86_64-linux-android
 
 ENV RUST_CONFIGURE_ARGS \
-      --target=$TARGETS \
       --enable-extended \
       --arm-linux-androideabi-ndk=/android/ndk/arm-14 \
       --armv7-linux-androideabi-ndk=/android/ndk/arm-14 \

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

@@ -32,5 +32,5 @@ ENV CC_arm_unknown_linux_gnueabi=arm-unknown-linux-gnueabi-gcc \
 
 ENV HOSTS=arm-unknown-linux-gnueabi
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

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

@@ -32,5 +32,5 @@ ENV CC_arm_unknown_linux_gnueabihf=arm-unknown-linux-gnueabihf-gcc \
 
 ENV HOSTS=arm-unknown-linux-gnueabihf
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-armv7-linux/Dockerfile

@@ -32,5 +32,5 @@ ENV CC_armv7_unknown_linux_gnueabihf=armv7-unknown-linux-gnueabihf-gcc \
 
 ENV HOSTS=armv7-unknown-linux-gnueabihf
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-i586-gnu-i586-i686-musl/Dockerfile

@@ -30,7 +30,6 @@ COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
 ENV RUST_CONFIGURE_ARGS \
-      --target=i686-unknown-linux-musl,i586-unknown-linux-gnu \
       --musl-root-i586=/musl-i586 \
       --musl-root-i686=/musl-i686 \
       --enable-extended
@@ -46,8 +45,7 @@ ENV CFLAGS_i586_unknown_linux_gnu=-Wa,-mrelax-relocations=no
 #       https://github.com/alexcrichton/cc-rs/pull/281
 ENV CFLAGS_i586_unknown_linux_musl="-Wa,-mrelax-relocations=no -Wl,-melf_i386"
 
-ENV TARGETS=i586-unknown-linux-gnu
-ENV TARGETS=$TARGETS,i686-unknown-linux-musl
+ENV TARGETS=i586-unknown-linux-gnu,i686-unknown-linux-musl
 
 ENV SCRIPT \
       python2.7 ../x.py test --target $TARGETS && \

src/ci/docker/dist-i686-freebsd/Dockerfile

@@ -29,5 +29,5 @@ ENV \
 
 ENV HOSTS=i686-unknown-freebsd
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-i686-linux/Dockerfile

@@ -82,13 +82,11 @@ RUN sh /scripts/sccache.sh
 ENV HOSTS=i686-unknown-linux-gnu
 
 ENV RUST_CONFIGURE_ARGS \
-      --host=$HOSTS \
       --enable-extended \
       --enable-sanitizers \
       --enable-profiler \
-      --enable-emscripten \
-      --build=i686-unknown-linux-gnu
-ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS
+      --enable-emscripten
+ENV SCRIPT python2.7 ../x.py dist --build $HOSTS --host $HOSTS --target $HOSTS
 
 # This is the only builder which will create source tarballs
 ENV DIST_SRC 1

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

@@ -22,5 +22,5 @@ RUN sh /scripts/sccache.sh
 
 ENV HOSTS=mips-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-mips64-linux/Dockerfile

@@ -21,5 +21,5 @@ RUN sh /scripts/sccache.sh
 
 ENV HOSTS=mips64-unknown-linux-gnuabi64
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-mips64el-linux/Dockerfile

@@ -22,5 +22,5 @@ RUN sh /scripts/sccache.sh
 
 ENV HOSTS=mips64el-unknown-linux-gnuabi64
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

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

@@ -21,5 +21,5 @@ RUN sh /scripts/sccache.sh
 
 ENV HOSTS=mipsel-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

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

@@ -34,7 +34,7 @@ ENV \
 
 ENV HOSTS=powerpc-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS
 
 # FIXME(#36150) this will fail the bootstrap. Probably means something bad is

src/ci/docker/dist-powerpc64-linux/Dockerfile

@@ -35,5 +35,5 @@ ENV \
 
 ENV HOSTS=powerpc64-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-powerpc64le-linux/Dockerfile

@@ -32,5 +32,5 @@ ENV \
 
 ENV HOSTS=powerpc64le-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-s390x-linux/Dockerfile

@@ -34,5 +34,5 @@ ENV \
 
 ENV HOSTS=s390x-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

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

@@ -89,7 +89,6 @@ ENV CC_mipsel_unknown_linux_musl=mipsel-openwrt-linux-gcc \
     CFLAGS_armv5te_unknown_linux_gnueabi="-march=armv5te -marm -mfloat-abi=soft"
 
 ENV RUST_CONFIGURE_ARGS \
-      --target=$TARGETS \
       --musl-root-arm=/musl-arm \
       --musl-root-armhf=/musl-armhf \
       --musl-root-armv7=/musl-armv7 \

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

@@ -55,5 +55,5 @@ ENV TARGETS=$TARGETS,x86_64-sun-solaris
 ENV TARGETS=$TARGETS,x86_64-unknown-linux-gnux32
 ENV TARGETS=$TARGETS,x86_64-unknown-cloudabi
 
-ENV RUST_CONFIGURE_ARGS --target=$TARGETS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --target $TARGETS

src/ci/docker/dist-x86_64-freebsd/Dockerfile

@@ -29,5 +29,5 @@ ENV \
 
 ENV HOSTS=x86_64-unknown-freebsd
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-x86_64-linux/Dockerfile

@@ -82,7 +82,6 @@ RUN sh /scripts/sccache.sh
 ENV HOSTS=x86_64-unknown-linux-gnu
 
 ENV RUST_CONFIGURE_ARGS \
-      --host=$HOSTS \
       --enable-extended \
       --enable-sanitizers \
       --enable-profiler \

src/ci/docker/dist-x86_64-musl/Dockerfile

@@ -30,7 +30,6 @@ COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
 ENV RUST_CONFIGURE_ARGS \
-      --target=x86_64-unknown-linux-musl \
       --musl-root-x86_64=/musl-x86_64 \
       --enable-extended
 

src/ci/docker/dist-x86_64-netbsd/Dockerfile

@@ -33,5 +33,5 @@ ENV \
 
 ENV HOSTS=x86_64-unknown-netbsd
 
-ENV RUST_CONFIGURE_ARGS --host=$HOSTS --enable-extended
+ENV RUST_CONFIGURE_ARGS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/wasm32-unknown/Dockerfile

@@ -22,7 +22,6 @@ RUN sh /scripts/sccache.sh
 ENV TARGETS=wasm32-unknown-unknown
 
 ENV RUST_CONFIGURE_ARGS \
-  --target=$TARGETS \
   --set build.nodejs=/node-v9.2.0-linux-x64/bin/node
 
 ENV SCRIPT python2.7 /checkout/x.py test --target $TARGETS \