Test compilation on 32 bit target

Author: serge-sans-paille

.azure-pipelines/azure-pipelines-linux-gcc.yml

@@ -29,6 +29,9 @@ jobs:
           enable_xtl_complex: 1
         gcc_9:
           gcc_version: '9'
+        gcc_9_m32:
+          gcc_version: '9'
+          i686: 1
     pool:
       vmImage: ubuntu-16.04
     variables:
@@ -49,6 +52,12 @@ jobs:
               sudo apt-get --no-install-suggests --no-install-recommends install qemu qemu-system-aarch64
             fi
           fi
+          if [[ $(i686) ]]; then
+            sudo dpkg --add-architecture i386
+            sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+            sudo apt-get update
+            sudo apt-get --no-install-suggests --no-install-recommends install gcc-$(gcc_version)-multilib g++-$(gcc_version)-multilib linux-libc-dev:i386
+          fi
         displayName: Install build toolchain
 
       - bash: echo "##vso[task.prependpath]$CONDA/bin"

.azure-pipelines/unix-build.yml

@@ -39,6 +39,9 @@ steps:
       if [[ $(force_no_instr_set) == 1 ]]; then
         CMAKE_EXTRA_ARGS="$CMAKE_EXTRA_ARGS -DXSIMD_FORCE_X86_INSTR_SET=0 -DXSIMD_FORCE_X86_AMD_INSTR_SET=0";
       fi
+      if [[ $(i686) == 1 ]] ; then
+        CMAKE_EXTRA_ARGS="$CMAKE_EXTRA_ARGS -DCMAKE_CXX_FLAGS='-m32'"
+      fi
 
       cmake -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX $CMAKE_EXTRA_ARGS -DDOWNLOAD_GTEST=ON -DXSIMD_ENABLE_WERROR=1 $(Build.SourcesDirectory)
     displayName: Configure xsimd