[eclipse-wakaamaGH-494] ci: Build and test on multiple architectures

This also fixes the CMake build on big endian architectures and the unit
tests on aarch64, s390x, ppc64le.

This is more complex than it should be because...
- Ubuntu 20.04 does not support many architectures, Debian does (e.g.
  ARMv5, MIPSel)
- CMake versions before 3.19 are affected by
  https://gitlab.kitware.com/cmake/cmake/-/issues/20568

Signed-off-by: Reto Schneider <code@reto-schneider.ch>

.github/workflows/multiarch.yaml

@@ -0,0 +1,46 @@
+name: Foreign architectures
+
+on: [push, pull_request]
+
+jobs:
+  multiarch:
+    runs-on: ubuntu-20.04
+    env:
+       cmake_version: 3.20.0
+    strategy:
+      fail-fast: false
+      matrix:
+        arch: ["armv6", "armv7", "aarch64", "s390x", "ppc64le"]
+    steps:
+    - name: Checkout code including full history and submodules
+      uses: actions/checkout@v2
+      with:
+        submodules: true
+        fetch-depth: 0
+    - name: Build and test
+      uses: uraimo/run-on-arch-action@v2.0.9
+      id: runcmd
+      with:
+        arch: ${{ matrix.arch }}
+        distro: buster
+        githubToken: ${{ github.token }}
+        install: |
+          apt update
+          apt -qy --no-install-recommends install libcunit1-dev ninja-build unzip wget build-essential
+          # Workaround because of https://gitlab.kitware.com/cmake/cmake/-/issues/20568
+          # Please remove once CMake 3.19 or newer is available in the repository
+          apt -qy --no-install-recommends install dirmngr gpg gpg-agent
+          echo deb-src http://archive.raspbian.org/raspbian buster main contrib non-free >> /etc/apt/sources.list
+          apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9165938D90FDDD2E
+          apt update
+          apt -qy --no-install-recommends build-dep cmake
+          wget https://github.com/Kitware/CMake/releases/download/v${{ env.cmake_version }}/cmake-${{ env.cmake_version }}.tar.gz
+          tar xf cmake-${{ env.cmake_version }}.tar.gz
+          cd cmake-${{ env.cmake_version }}
+          ./bootstrap -- -DCMAKE_USE_OPENSSL=OFF -DBUILD_TESTING=OFF
+          make -j $(nproc)
+          make install
+          cd ..
+          rm -r cmake-${{ env.cmake_version }} cmake-${{ env.cmake_version }}.tar.gz
+        run: |
+          tools/ci/run_ci.sh --build --run-tests

core/wakaama.cmake

@@ -41,6 +41,8 @@ endif()
 
 if (LWM2M_LITTLE_ENDIAN)
     add_compile_definitions(LWM2M_LITTLE_ENDIAN)
+else()
+    add_compile_definitions(LWM2M_BIG_ENDIAN)
 endif()
 
 # Set the LWM2M version

tests/convert_numbers_test.c

@@ -102,11 +102,11 @@ static void test_utils_textToFloat(void)
         {
             CU_ASSERT_DOUBLE_EQUAL(res, floats[i], floats[i]/1000000.0);
             if(fabs(res - floats[i]) > fabs(floats[i]/1000000.0))
-                printf("%zu \"%s\" -> fail (%f)\n", i, floats_text[i], res);
+                printf("Entry #%zu, \"%s\" -> fail (%f)\n", i, floats_text[i], res);
         }
         else
         {
-            printf("%zu \"%s\" -> fail\n", i, floats_text[i]);
+            printf("Entry #%zu, \"%s\" could not be converted to \"%f\"-> fail\n", i, floats_text[i], floats[i]);
         }
     }
 }