set QEMU_LD_PREFIX in the runners in order to be able to use env -i

.changes/1420.json

@@ -0,0 +1,4 @@
+{
+  "description": "set the required environment variables in the runner",
+  "type": "fixed"
+}

ci/test.sh

@@ -243,6 +243,38 @@ main() {
     popd
 
     rm -rf "${td}"
+
+    # test running binaries with cleared environment
+    # Command is not implemented for wasm32-unknown-emscripten
+    if (( ${RUN:-0} )) && [[ "${TARGET}" != "wasm32-unknown-emscripten" ]]; then
+        td="$(mkcargotemp -d)"
+        pushd "${td}"
+        cargo init --bin --name foo .
+        mkdir src/bin
+        upper_target=$(echo "${TARGET}" | tr '[:lower:]' '[:upper:]' | tr '-' '_')
+        cat <<EOF > src/bin/launch.rs
+fn main() {
+    let runner = std::env::var("CARGO_TARGET_${upper_target}_RUNNER");
+    let mut command = if let Ok(runner) = runner {
+        runner.split(' ').map(str::to_string).collect()
+    } else {
+        vec![]
+    };
+    let executable = format!("/target/${TARGET}/debug/foo{}", std::env::consts::EXE_SUFFIX);
+    command.push(executable.to_string());
+    let status = dbg!(std::process::Command::new(&command[0])
+        .args(&command[1..])
+        .env_clear()) // drop all environment variables
+    .status()
+    .unwrap();
+    std::process::exit(status.code().unwrap());
+}
+EOF
+        cross_build --target "${TARGET}"
+        cross_run --target "${TARGET}" --bin launch
+        popd
+        rm -rf "${td}"
+    fi
 }
 
 cross_build() {

docker/Dockerfile.aarch64-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=aarch64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.aarch64-unknown-linux-gnu.centos

@@ -46,3 +46,5 @@ ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=aarch64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.aarch64-unknown-linux-musl

@@ -42,3 +42,5 @@ ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc.
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC" \
     CROSS_BUILTINS_PATCHED_MINOR_VERSION=48
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.arm-unknown-linux-gnueabi

@@ -45,3 +45,5 @@ ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABI_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv6 -marm -mfloat-abi=soft"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.arm-unknown-linux-gnueabihf

@@ -46,3 +46,5 @@ ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv6 -marm -mfpu=vfp"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.arm-unknown-linux-musleabi

@@ -44,3 +44,5 @@ ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_MUSLEABI_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv6 -marm -mfloat-abi=soft"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.arm-unknown-linux-musleabihf

@@ -45,3 +45,5 @@ ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_MUSLEABIHF_LINKER="$CROSS_TOOLCHAIN_PREFIX"gc
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv6 -marm -mfpu=vfp"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.armv5te-unknown-linux-gnueabi

@@ -46,3 +46,5 @@ ENV CARGO_TARGET_ARMV5TE_UNKNOWN_LINUX_GNUEABI_LINKER="$CROSS_TOOLCHAIN_PREFIX"g
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv5te -marm -mfloat-abi=soft"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.armv5te-unknown-linux-musleabi

@@ -46,3 +46,5 @@ ENV CARGO_TARGET_ARMV5TE_UNKNOWN_LINUX_MUSLEABI_LINKER="$CROSS_TOOLCHAIN_PREFIX"
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv5te -marm -mfloat-abi=soft" \
     CROSS_BUILTINS_PATCHED_MINOR_VERSION=65
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.armv7-unknown-linux-gnueabi

@@ -40,3 +40,5 @@ ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABI_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv7-a"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.armv7-unknown-linux-gnueabihf

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER="$CROSS_TOOLCHAIN_PREFIX"g
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv7-a -mfpu=vfpv3-d16"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.armv7-unknown-linux-musleabi

@@ -45,3 +45,5 @@ ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_MUSLEABI_LINKER="$CROSS_TOOLCHAIN_PREFIX"gc
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv7-a"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.armv7-unknown-linux-musleabihf

@@ -45,3 +45,5 @@ ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_MUSLEABIHF_LINKER="$CROSS_TOOLCHAIN_PREFIX"
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv7-a -mfpu=vfpv3-d16"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.i586-unknown-linux-gnu

@@ -45,3 +45,5 @@ ENV CARGO_TARGET_I586_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=x86 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m32 -march=pentium"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.i586-unknown-linux-musl

@@ -39,3 +39,5 @@ ENV CARGO_TARGET_I586_UNKNOWN_LINUX_MUSL_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=x86 \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m32 -march=pentium -Wl,-melf_i386"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.i686-pc-windows-gnu

@@ -43,7 +43,7 @@ COPY toolchain.cmake /opt/toolchain.cmake
 ENV CROSS_TOOLCHAIN_PREFIX=i686-w64-mingw32-
 ENV CROSS_TOOLCHAIN_SUFFIX=-posix
 ENV CROSS_SYSROOT=/usr/i686-w64-mingw32
-ENV CROSS_TARGET_RUNNER="wine"
+ENV CROSS_TARGET_RUNNER="env -u CARGO_TARGET_I686_PC_WINDOWS_GNU_RUNNER wine"
 ENV CARGO_TARGET_I686_PC_WINDOWS_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc"$CROSS_TOOLCHAIN_SUFFIX" \
     CARGO_TARGET_I686_PC_WINDOWS_GNU_RUNNER="$CROSS_TARGET_RUNNER" \
     AR_i686_pc_windows_gnu="$CROSS_TOOLCHAIN_PREFIX"ar \

docker/Dockerfile.i686-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_I686_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=x86 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m32 -march=i686"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.i686-unknown-linux-musl

@@ -39,3 +39,5 @@ ENV CARGO_TARGET_I686_UNKNOWN_LINUX_MUSL_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=x86 \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m32 -march=i686 -Wl,-melf_i386"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.mips-unknown-linux-gnu

@@ -40,3 +40,5 @@ ENV CARGO_TARGET_MIPS_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=mips \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.mips-unknown-linux-musl

@@ -44,3 +44,5 @@ ENV CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=mips \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.mips64-unknown-linux-gnuabi64

@@ -45,3 +45,5 @@ ENV CARGO_TARGET_MIPS64_UNKNOWN_LINUX_GNUABI64_LINKER="$CROSS_TOOLCHAIN_PREFIX"g
     CROSS_CMAKE_SYSTEM_PROCESSOR=mips64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.mips64-unknown-linux-muslabi64

@@ -50,3 +50,5 @@ ENV CARGO_TARGET_MIPS64_UNKNOWN_LINUX_MUSLABI64_LINKER="$CROSS_TOOLCHAIN_PREFIX"
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC" \
     CROSS_BUILTINS_PATCHED_MINOR_VERSION=65
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.mips64el-unknown-linux-gnuabi64

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_MIPS64EL_UNKNOWN_LINUX_GNUABI64_LINKER="$CROSS_TOOLCHAIN_PREFIX
     CROSS_CMAKE_SYSTEM_PROCESSOR=mips64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.mips64el-unknown-linux-muslabi64

@@ -50,3 +50,5 @@ ENV CARGO_TARGET_MIPS64EL_UNKNOWN_LINUX_MUSLABI64_LINKER="$CROSS_TOOLCHAIN_PREFI
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC" \
     CROSS_BUILTINS_PATCHED_MINOR_VERSION=65
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.mipsel-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=mips \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.mipsel-unknown-linux-musl

@@ -44,3 +44,5 @@ ENV CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_MUSL_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=mips \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/Dockerfile.native

@@ -33,3 +33,6 @@ ENV CROSS_TARGETVARIANT=$TARGETVARIANT
 ENV CROSS_TOOLCHAIN_PREFIX=
 ENV CROSS_SYSROOT=/
 ENV CARGO_TARGET_${CROSS_TARGET_TRIPLE}_RUNNER="/native-linux-runner"
+
+RUN sed -e "s#@DEFAULT_CROSS_TARGETARCH@#$CROSS_TARGETARCH#g" -i /native-linux-runner
+RUN sed -e "s#@DEFAULT_CROSS_TARGETVARIANT@#$CROSS_TARGETVARIANT#g" -i /native-linux-runner

docker/Dockerfile.native.centos

@@ -40,3 +40,6 @@ ENV CROSS_TARGETVARIANT=$TARGETVARIANT
 ENV CROSS_TOOLCHAIN_PREFIX=
 ENV CROSS_SYSROOT=/
 ENV CARGO_TARGET_${CROSS_TARGET_TRIPLE}_RUNNER="/native-linux-runner"
+
+RUN sed -e "s#@DEFAULT_CROSS_TARGETARCH@#$CROSS_TARGETARCH#g" -i /native-linux-runner
+RUN sed -e "s#@DEFAULT_CROSS_TARGETVARIANT@#$CROSS_TARGETVARIANT#g" -i /native-linux-runner

docker/Dockerfile.powerpc-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_POWERPC_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=ppc \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.powerpc64-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_POWERPC64_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc
     CROSS_CMAKE_SYSTEM_PROCESSOR=ppc64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m64"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.powerpc64le-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_POWERPC64LE_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"g
     CROSS_CMAKE_SYSTEM_PROCESSOR=ppc64le \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m64"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.riscv64gc-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc
     CROSS_CMAKE_SYSTEM_PROCESSOR=riscv64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=rv64gc -mabi=lp64d -mcmodel=medany"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.s390x-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_S390X_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=s390x \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.sparc64-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_SPARC64_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=sparc64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.thumbv7neon-unknown-linux-gnueabihf

@@ -57,3 +57,5 @@ ENV CARGO_TARGET_THUMBV7NEON_UNKNOWN_LINUX_GNUEABIHF_LINKER="$CROSS_TOOLCHAIN_PR
     CROSS_CMAKE_SYSTEM_PROCESSOR=arm \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -march=armv7-a -mfpu=vfpv3-d16 -mfpu=neon-vfpv4 -mthumb -mfloat-abi=hard"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.x86_64-pc-windows-gnu

@@ -41,7 +41,7 @@ COPY toolchain.cmake /opt/toolchain.cmake
 ENV CROSS_TOOLCHAIN_PREFIX=x86_64-w64-mingw32-
 ENV CROSS_TOOLCHAIN_SUFFIX=-posix
 ENV CROSS_SYSROOT=/usr/x86_64-w64-mingw32
-ENV CROSS_TARGET_RUNNER="wine"
+ENV CROSS_TARGET_RUNNER="env -u CARGO_TARGET_X86_64_PC_WINDOWS_GNU_RUNNER wine"
 ENV CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc"$CROSS_TOOLCHAIN_SUFFIX" \
     CARGO_TARGET_X86_64_PC_WINDOWS_GNU_RUNNER="$CROSS_TARGET_RUNNER" \
     AR_x86_64_pc_windows_gnu="$CROSS_TOOLCHAIN_PREFIX"ar \

docker/Dockerfile.x86_64-unknown-linux-gnu

@@ -51,3 +51,5 @@ ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=x86_64 \
     CROSS_CMAKE_CRT=gnu \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m64"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /linux-runner

docker/Dockerfile.x86_64-unknown-linux-musl

@@ -39,3 +39,5 @@ ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_LINKER="$CROSS_TOOLCHAIN_PREFIX"gcc \
     CROSS_CMAKE_SYSTEM_PROCESSOR=x86_64 \
     CROSS_CMAKE_CRT=musl \
     CROSS_CMAKE_OBJECT_FLAGS="-ffunction-sections -fdata-sections -fPIC -m64"
+
+RUN sed -e "s#@DEFAULT_QEMU_LD_PREFIX@#$QEMU_LD_PREFIX#g" -i /qemu-runner

docker/linux-runner

@@ -24,6 +24,10 @@ if [[ -z "${CROSS_RUNNER}" ]]; then
     fi
 fi
 
+# Ensure that the correct prefix is set even if the user has cleared the env.
+# `@DEFAULT_QEMU_LD_PREFIX@` is replaced during image build.
+export QEMU_LD_PREFIX=${QEMU_LD_PREFIX:-@DEFAULT_QEMU_LD_PREFIX@}
+
 qarch=$(qemu_arch "${arch}")
 case "${CROSS_RUNNER}" in
     native)

docker/native-linux-runner

@@ -7,7 +7,7 @@ set -eo pipefail
 
 main() {
     local arch
-    arch=$(docker_to_linux_arch "${CROSS_TARGETARCH}" "${CROSS_TARGETVARIANT}")
+    arch=$(docker_to_linux_arch "${CROSS_TARGETARCH:-@DEFAULT_CROSS_TARGETARCH@}" "${CROSS_TARGETVARIANT:-@DEFAULT_CROSS_TARGETVARIANT@}")
 
     if [[ -z "${CROSS_RUNNER}" ]]; then
         export CROSS_RUNNER=native

docker/qemu-runner

@@ -24,6 +24,10 @@ if [[ -z "${CROSS_RUNNER}" ]]; then
     fi
 fi
 
+# Ensure that the correct prefix is set even if the user has cleared the env.
+# `@DEFAULT_QEMU_LD_PREFIX@` is replaced during image build.
+export QEMU_LD_PREFIX=${QEMU_LD_PREFIX:-@DEFAULT_QEMU_LD_PREFIX@}
+
 qarch=$(qemu_arch "${arch}")
 case "${CROSS_RUNNER}" in
     native)