diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index c32262b..ca02a51 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -11,38 +11,43 @@ jobs:
       matrix:
         aarch64:
           TARGET: aarch64-unknown-linux-gnu
-        arm:
-          TARGET: arm-unknown-linux-gnueabi
-        armhf:
-          TARGET: arm-unknown-linux-gnueabihf
-        i586:
-          TARGET: i586-unknown-linux-gnu
-        i686:
-          TARGET: i686-unknown-linux-gnu
-        mips:
-          TARGET: mips-unknown-linux-gnu
-        mips64:
-          TARGET: mips64-unknown-linux-gnuabi64
-        mips64el:
-          TARGET: mips64el-unknown-linux-gnuabi64
-        mipsel:
-          TARGET: mipsel-unknown-linux-gnu
-        powerpc:
-          TARGET: powerpc-unknown-linux-gnu
-        powerpc64:
-          TARGET: powerpc64-unknown-linux-gnu
-        powerpc64le:
-          TARGET: powerpc64le-unknown-linux-gnu
+        # arm:
+        #   TARGET: arm-unknown-linux-gnueabi
+        # armhf:
+        #   TARGET: arm-unknown-linux-gnueabihf
+        # i586:
+        #   TARGET: i586-unknown-linux-gnu
+        # i686:
+        #   TARGET: i686-unknown-linux-gnu
+        # mips:
+        #   TARGET: mips-unknown-linux-gnu
+        # mips64:
+        #   TARGET: mips64-unknown-linux-gnuabi64
+        # mips64el:
+        #   TARGET: mips64el-unknown-linux-gnuabi64
+        # mipsel:
+        #   TARGET: mipsel-unknown-linux-gnu
+        # powerpc:
+        #   TARGET: powerpc-unknown-linux-gnu
+        # powerpc64:
+        #   TARGET: powerpc64-unknown-linux-gnu
+        # powerpc64le:
+        #   TARGET: powerpc64le-unknown-linux-gnu
         thumbv6m:
           TARGET: thumbv6m-linux-eabi
+          XARGO: 1
         thumbv7em:
           TARGET: thumbv7em-linux-eabi
+          XARGO: 1
         thumbv7emhf:
           TARGET: thumbv7em-linux-eabihf
+          XARGO: 1
         thumbv7m:
           TARGET: thumbv7m-linux-eabi
+          XARGO: 1
         wasm32:
           TARGET: wasm32-unknown-unknown
+          ONLY_BUILD: 1
         x86_64:
           TARGET: x86_64-unknown-linux-gnu
 
@@ -55,8 +60,8 @@ jobs:
       matrix:
         x86_64:
           TARGET: x86_64-apple-darwin
-        i686:
-          TARGET: i686-apple-darwin
+        # i686:
+        #   TARGET: i686-apple-darwin
 
   - job: Windows
     pool:
@@ -67,9 +72,9 @@ jobs:
       matrix:
         i686-msvc:
           TARGET: i686-pc-windows-msvc
-        x86_64-msvc:
-          TARGET: x86_64-pc-windows-msvc
-        i686-gnu:
-          TARGET: i686-pc-windows-gnu
+        # x86_64-msvc:
+        #   TARGET: x86_64-pc-windows-msvc
+        # i686-gnu:
+        #   TARGET: i686-pc-windows-gnu
         x86_64-gnu:
           TARGET: x86_64-pc-windows-gnu
diff --git a/ci/azure-steps.yml b/ci/azure-steps.yml
index 19972a7..c8a9540 100644
--- a/ci/azure-steps.yml
+++ b/ci/azure-steps.yml
@@ -4,13 +4,23 @@ steps:
 
   - template: azure-install-rust.yml
 
+  - script: rustup component add rust-src
+    displayName: Install Rust sources
+    condition: eq( variables['XARGO'], '1' )
+
   - bash: rustup target add $TARGET
-    displayName: Install compilation target
+    displayName: Install Rust target
+    condition: ne( variables['XARGO'], '1' )
 
   - bash: ./ci/run.sh $TARGET
     condition: ne( variables['Agent.OS'], 'Linux' )
     displayName: Run test script
 
-  - bash: cargo generate-lockfile && ./ci/run-docker.sh $TARGET
+  - bash: |
+      if [ "$ONLY_BUILD" = "1" ]; then
+        cargo build --target $TARGET
+      else
+        cargo generate-lockfile && ./ci/run-docker.sh $TARGET
+      fi
     condition: eq( variables['Agent.OS'], 'Linux' )
     displayName: Run docker test script
diff --git a/ci/run-docker.sh b/ci/run-docker.sh
index 6b3066e..5c2e065 100755
--- a/ci/run-docker.sh
+++ b/ci/run-docker.sh
@@ -18,6 +18,7 @@ run() {
            --user $(id -u):$(id -g) \
            -e CARGO_HOME=/cargo \
            -e CARGO_TARGET_DIR=/target \
+           -e XARGO \
            -v $HOME/.cargo:/cargo \
            -v `pwd`/target:/target \
            -v `pwd`:/checkout:ro \
diff --git a/ci/run.sh b/ci/run.sh
index b777522..589553a 100755
--- a/ci/run.sh
+++ b/ci/run.sh
@@ -3,14 +3,10 @@ set -ex
 # FIXME(japarix/xargo#186) this shouldn't be necessary
 export RUST_TARGET_PATH=`pwd`
 
-case $1 in
-    thumb*)
-        cargo=xargo
-        ;;
-    *)
-        cargo=cargo
-        ;;
-esac
+cargo=cargo
+if [ "$XARGO" = "1" ]; then
+  cargo=xargo
+fi
 
 INTRINSICS_FEATURES="c"
 
@@ -22,34 +18,31 @@ if [ -z "$INTRINSICS_FAILS_WITH_MEM_FEATURE" ]; then
 fi
 
 # Test our implementation
-case $1 in
-    thumb*)
-        run="xargo test --manifest-path testcrate/Cargo.toml --target $1"
-        for t in $(ls testcrate/tests); do
-            t=${t%.rs}
+if [ "$XARGO" = "1" ]; then
+    run="xargo test --manifest-path testcrate/Cargo.toml --target $1"
+    for t in $(ls testcrate/tests); do
+        t=${t%.rs}
 
-            RUSTFLAGS="-C debug-assertions=no -C lto" \
-            CARGO_INCREMENTAL=0 \
-              $run --test $t --no-default-features --features 'mem c' --no-run
-            qemu-arm-static target/${1}/debug/$t-*
-	done
+        RUSTFLAGS="-C debug-assertions=no -C lto" \
+        CARGO_INCREMENTAL=0 \
+          $run --test $t --no-default-features --features 'mem c' --no-run
+        qemu-arm-static target/${1}/debug/$t-*
+    done
 
-	for t in $(ls testcrate/tests); do
-            t=${t%.rs}
-            RUSTFLAGS="-C lto" \
-            CARGO_INCREMENTAL=0 \
-              $run --test $t --no-default-features --features 'mem c' --no-run --release
-            qemu-arm-static target/${1}/release/$t-*
-        done
-        ;;
-    *)
-        run="cargo test --manifest-path testcrate/Cargo.toml --target $1"
-        $run
-        $run --release
-        $run --features c
-        $run --features c --release
-        ;;
-esac
+    for t in $(ls testcrate/tests); do
+        t=${t%.rs}
+        RUSTFLAGS="-C lto" \
+        CARGO_INCREMENTAL=0 \
+          $run --test $t --no-default-features --features 'mem c' --no-run --release
+        qemu-arm-static target/${1}/release/$t-*
+    done
+else
+    run="cargo test --manifest-path testcrate/Cargo.toml --target $1"
+    $run
+    $run --release
+    $run --features c
+    $run --features c --release
+fi
 
 PREFIX=$(echo $1 | sed -e 's/unknown-//')-
 case $1 in