Add Linux 32-bit to Azure

README.md

@@ -5,7 +5,7 @@
 ![Stability: experimental](https://img.shields.io/badge/stability-experimental-orange.svg)\
 ![Github Actions CI](https://github.com/mratsim/constantine/workflows/Constantine%20CI/badge.svg)\
 [![Build Status: Travis](https://img.shields.io/travis/com/mratsim/constantine/master?label=Travis%20%28Linux%20x86_64%2FARM64,%20MacOS%20x86_64%29)](https://travis-ci.com/mratsim/constantine)\
-[![Build Status: Azure](https://img.shields.io/azure-devops/build/numforge/07a2a7a5-995a-45d3-acd5-f5456fe7b04d/4?label=Azure%20%28Linux%2064-bit%2C%20Windows%2032%2F64-bit%2C%20MacOS%2064-bit%29)](https://dev.azure.com/numforge/Constantine/_build?definitionId=4&branchName=master)
+[![Build Status: Azure](https://img.shields.io/azure-devops/build/numforge/07a2a7a5-995a-45d3-acd5-f5456fe7b04d/4?label=Azure%20%28Linux%2032%2F64-bit%2C%20Windows%2032%2F64-bit%2C%20MacOS%2064-bit%29)](https://dev.azure.com/numforge/Constantine/_build?definitionId=4&branchName=master)
 
 This library provides constant-time implementation of elliptic curve cryptography.
 

azure-pipelines.yml

@@ -31,11 +31,11 @@ strategy:
       CHANNEL: devel
       WEAVE_TEST_LANG: cpp
 
-    # Linux_devel_32bit:
-    #   VM: 'ubuntu-16.04'
-    #   UCPU: i686
-    #   CHANNEL: devel
-    #   TEST_LANG: c
+    Linux_devel_32bit:
+      VM: 'ubuntu-16.04'
+      UCPU: i686
+      CHANNEL: devel
+      TEST_LANG: c
 
     MacOS_devel_64bit:
       VM: 'macOS-10.15'
@@ -119,6 +119,29 @@ steps:
       echo "##vso[task.setvariable variable=ncpu;]$ncpu"
     displayName: 'Detecting number of cores'
 
+  - bash: |
+      sudo dpkg --add-architecture i386
+
+      sudo apt-fast update -qq
+      # `:i386` (e.g. in `libffi-dev:i386`) is needed otherwise you may get:
+      # `could not load: libffi.so` during dynamic loading.
+      DEBIAN_FRONTEND='noninteractive' \
+        sudo apt-fast install --no-install-recommends --allow-downgrades -yq \
+          g++-multilib gcc-multilib libcurl4-openssl-dev:i386 libgc-dev:i386 \
+          libffi-dev:i386
+      cat << EOF > bin/gcc
+      #!/bin/bash
+      exec $(which gcc) -m32 "\$@"
+      EOF
+      cat << EOF > bin/g++
+      #!/bin/bash
+      exec $(which g++) -m32 "\$@"
+      EOF
+      chmod 755 bin/gcc
+      chmod 755 bin/g++
+    displayName: 'Install dependencies (i386 Linux)'
+    condition: and(eq(variables['Agent.OS'], 'Linux'), eq(variables['CPU'], 'i686'))
+
   - bash: |
       echo "PATH=${PATH}"
       gcc -v
@@ -178,6 +201,12 @@ steps:
   #   displayName: 'Downloading GMP (MacOS)'
   #   condition: eq(variables['Agent.OS'], 'Darwin')
 
+  - bash: |
+      echo "PATH=${PATH}"
+      sudo apt-get install libgmp-dev
+    displayName: 'Downloading GMP (Linux 32-bit)'
+    condition: and(eq(variables['Agent.OS'], 'Linux'), eq(variables['CPU'], 'i686'))
+
   - bash: |
       echo "PATH=${PATH}"
       nimble refresh