[v10,4/5] ci: add aarch64 -> aarch32 cross compiling jobs

Add two jobs (static and shared libs), both building on aarch64 and
producing 32-bit arm binaries executable on armv8-a, but not armv7.
Do not run tests in these jobs.

Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
---
 .ci/linux-build.sh |  7 ++++++-
 .travis.yml        | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Juraj Linke?
> Sent: Wednesday, September 16, 2020 4:21 PM
> To: thomas@monjalon.net; bruce.richardson@intel.com;
> aconole@redhat.com; maicolgabriel@hotmail.com
> Cc: juraj.linkes@pantheon.tech; dev@dpdk.org
> Subject: [dpdk-dev] [PATCH v10 4/5] ci: add aarch64 -> aarch32 cross
> compiling jobs
> 
> Add two jobs (static and shared libs), both building on aarch64 and producing
> 32-bit arm binaries executable on armv8-a, but not armv7.
> Do not run tests in these jobs.
> 
> Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
> ---
>  .ci/linux-build.sh |  7 ++++++-
>  .travis.yml        | 19 +++++++++++++++++++
>  2 files changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/.ci/linux-build.sh b/.ci/linux-build.sh index d079801d7..cdb371565
> 100755
> --- a/.ci/linux-build.sh
> +++ b/.ci/linux-build.sh
> @@ -33,6 +33,11 @@ if [ "$AARCH64" = "1" ]; then
>      OPTS="$OPTS --cross-file config/arm/arm64_armv8_linux_gcc"
>  fi
> 
> +if [ "$AARCH32" = "1" ]; then
> +    # convert the arch specifier
> +    OPTS="$OPTS --cross-file config/arm/arm32_armv8a_linux_gcc"
> +fi
> +
>  if [ "$BUILD_DOCS" = "1" ]; then
>      OPTS="$OPTS -Denable_docs=true"
>  fi
> @@ -53,7 +58,7 @@ OPTS="$OPTS --buildtype=debugoptimized"
>  meson build --werror $OPTS
>  ninja -C build
> 
> -if [ "$AARCH64" != "1" ]; then
> +if [ "$AARCH64" != "1" ] && [ "$AARCH32" != "1" ]; then
>      devtools/test-null.sh
>  fi
> 
> diff --git a/.travis.yml b/.travis.yml
> index d6eeab371..850faaac1 100644
> --- a/.travis.yml
> +++ b/.travis.yml
> @@ -18,6 +18,10 @@ _aarch64_packages: &aarch64_packages
>    - *required_packages
>    - [gcc-aarch64-linux-gnu, libc6-dev-arm64-cross, pkg-config-aarch64-linux-
> gnu]
> 
> +_arm_32b_packages: &arm_32b_packages
> +  - *required_packages
> +  - [gcc-arm-linux-gnueabihf, libc6-dev-armhf-cross,
> +pkg-config-arm-linux-gnueabihf]
> +
>  _build_32b_packages: &build_32b_packages
>    - *required_packages
>    - [gcc-multilib]
> @@ -98,6 +102,21 @@ jobs:
>          packages:
>            - *required_packages
>            - *doc_packages
> +  # aarch64 cross-compiling aarch32 jobs
> +  - env: DEF_LIB="shared" AARCH32=1
> +    arch: arm64
> +    compiler: gcc
> +    addons:
> +      apt:
> +        packages:
> +          - *arm_32b_packages
> +  - env: DEF_LIB="static" AARCH32=1
> +    arch: arm64
> +    compiler: gcc
> +    addons:
> +      apt:
> +        packages:
> +          - *arm_32b_packages
>    # aarch64 clang jobs
>    - env: DEF_LIB="static"
>      arch: arm64
> --
> 2.20.1

Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>