travis: add 32bit linux testing

.travis.yml

@@ -8,13 +8,55 @@ matrix:
 
   include:
     - os: linux
-      env: NIM_COMPILE_TO_CPP=false
+      env:
+        - NIM_COMPILE_TO_CPP=false
+        - CPU=amd64
+
+    - os: linux
+      env:
+        - NIM_COMPILE_TO_CPP=false
+        - CPU=i386
+        - DOCKER_BASE_IMAGE=i386/ubuntu:xenial
+        - DOCKER_IMAGE=nim-ci
+
+      language: minimal
+      services: docker
+
+      addons:
+      install:
+        # heredoc can't be used here due to how travis launches commands
+        - |
+          docker build -t "$DOCKER_IMAGE" - <<< "
+          FROM $DOCKER_BASE_IMAGE
+          RUN apt-get update -qq
+          RUN apt-get install -yq --no-install-suggests --no-install-recommends \
+          gcc g++ libc6-dev make nodejs libcurl4-openssl-dev libsdl1.2-dev \
+          libgc-dev libsfml-dev locales
+          RUN locale-gen en_US.UTF-8
+          ENV LANG=en_US.UTF-8
+          ENV PATH=\"/nim/bin\${PATH:+:\${PATH}}\"
+          "
+        - export CC=gcc
+        # seccomp has to be disabled for coroutines & boehm tests due to
+        # usage of getcontext() on 32bit linux. See moby/moby#28162
+        - >
+          containerId=$(docker run --security-opt seccomp=unconfined -e TRAVIS
+          -e NIM_COMPILE_TO_CPP -e CC -v "$PWD":/nim -w /nim
+          -itd "$DOCKER_IMAGE")
+        - |
+          run() {
+            docker exec -it "$containerId" bash -c "$*"
+          }
 
     - os: osx
-      env: NIM_COMPILE_TO_CPP=false
+      env:
+        - NIM_COMPILE_TO_CPP=false
+        - CPU=amd64
 
     - os: osx
-      env: NIM_COMPILE_TO_CPP=true
+      env:
+        - NIM_COMPILE_TO_CPP=true
+        - CPU=amd64
 
 # To allow failures for a failing configuration, use something like:
 #  allow_failures:
@@ -34,16 +76,22 @@ addons:
     - make
     - sfml
 
+install:
+  - |
+    run() {
+      "$@"
+    }
+
 before_script:
   - git clone --depth 1 https://github.com/nim-lang/csources.git
-  - make -C csources -j 2 LD=$CC
+  - run make -C csources -j 2 LD=$CC ucpu=$CPU
   - export PATH=$(pwd)/bin${PATH:+:$PATH}
 
 script:
   - echo "travis_fold:start:nim_c_koch"
-  - nim c koch
+  - run nim c koch
   - echo "travis_fold:end:nim_c_koch"
-  - ./koch runCI
+  - run ./koch runCI
 
 before_deploy:
   # Make https://nim-lang.github.io/Nim work the same as https://nim-lang.github.io/Nim/overview.html
@@ -59,4 +107,4 @@ deploy:                         # https://nim-lang.github.io/Nim
     branch: devel
 
 # Extract failed tests
-after_failure: nim c -r tools/ci_testresults.nim
+after_failure: run nim c -r tools/ci_testresults.nim