tests/docker: handle host-arch selection for all-test-cross

When building on non-x86 we get a bunch but not all of the compilers.
Handle this in the Dockerfile by probing the arch and expanding the
list available.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250725154517.3523095-14-alex.bennee@linaro.org>

tests/docker/dockerfiles/debian-all-test-cross.docker

@@ -23,7 +23,9 @@ RUN DEBIAN_FRONTEND=noninteractive eatmydata \
         bison \
         ccache \
         clang  \
+        dpkg-dev \
         flex \
+        gcc \
         git \
         libclang-rt-dev \
         ninja-build \
@@ -33,16 +35,11 @@ RUN DEBIAN_FRONTEND=noninteractive eatmydata \
         python3-venv \
         python3-wheel
 
-RUN DEBIAN_FRONTEND=noninteractive eatmydata \
-        apt install -y --no-install-recommends \
-        gcc-aarch64-linux-gnu \
+# All the generally available compilers
+ENV AVAILABLE_COMPILERS gcc-aarch64-linux-gnu \
         libc6-dev-arm64-cross \
         gcc-arm-linux-gnueabihf \
         libc6-dev-armhf-cross \
-        gcc-hppa-linux-gnu \
-        libc6-dev-hppa-cross \
-        gcc-m68k-linux-gnu \
-        libc6-dev-m68k-cross \
         gcc-mips-linux-gnu \
         libc6-dev-mips-cross \
         gcc-mips64-linux-gnuabi64 \
@@ -51,18 +48,25 @@ RUN DEBIAN_FRONTEND=noninteractive eatmydata \
         libc6-dev-mips64el-cross \
         gcc-mipsel-linux-gnu \
         libc6-dev-mipsel-cross \
-        gcc-powerpc-linux-gnu \
-        libc6-dev-powerpc-cross \
-        gcc-powerpc64-linux-gnu \
-        libc6-dev-ppc64-cross \
         gcc-powerpc64le-linux-gnu \
         libc6-dev-ppc64el-cross \
         gcc-riscv64-linux-gnu \
         libc6-dev-riscv64-cross \
         gcc-s390x-linux-gnu \
-        libc6-dev-s390x-cross \
-        gcc-sparc64-linux-gnu \
-        libc6-dev-sparc64-cross && \
+        libc6-dev-s390x-cross
+
+RUN if dpkg-architecture -e amd64; then \
+  export AVAILABLE_COMPILERS="${AVAILABLE_COMPILERS} gcc-hppa-linux-gnu libc6-dev-hppa-cross"; \
+  export AVAILABLE_COMPILERS="${AVAILABLE_COMPILERS} gcc-m68k-linux-gnu libc6-dev-m68k-cross"; \
+  export AVAILABLE_COMPILERS="${AVAILABLE_COMPILERS} gcc-powerpc-linux-gnu libc6-dev-powerpc-cross"; \
+  export AVAILABLE_COMPILERS="${AVAILABLE_COMPILERS} gcc-powerpc64-linux-gnu libc6-dev-ppc64-cross"; \
+  export AVAILABLE_COMPILERS="${AVAILABLE_COMPILERS} gcc-sparc64-linux-gnu libc6-dev-sparc64-cross"; \
+  fi && \
+  echo "compilers: ${AVAILABLE_COMPILERS}"
+
+RUN DEBIAN_FRONTEND=noninteractive eatmydata \
+        apt install -y --no-install-recommends \
+        ${AVAILABLE_COMPILERS} && \
         dpkg-query --showformat '${Package}_${Version}_${Architecture}\n' --show > /packages.txt