Build in a container on Linux to preserve compatibility with older Li…

.github/workflows/create_release.yml

@@ -5,16 +5,27 @@ on:
         - '[0-9]+.[0-9]+.[0-9]+'
 jobs:
     build-ubuntu:
-        runs-on: ubuntu-22.04
+        runs-on: ubuntu-latest
+        container:
+          image: ubuntu:20.04
         env:
-            OPENTELEMETRY_MATLAB_INSTALL: "${{ github.workspace }}/otel_matlab_install"
+            OPENTELEMETRY_MATLAB_INSTALL_FOLDER: "otel_matlab_install"   # not including the context github.workspace since it doesn't work inside a container due to a bug
         steps:
             - name: Download OpenTelemetry-Matlab source
               uses: actions/checkout@v3
               with: 
                 path: opentelemetry-matlab
-            - name: Install ninja-build
-              run: sudo apt-get install ninja-build
+            - name: Install compiler and other tools
+              env:
+                DEBIAN_FRONTEND: "noninteractive"
+              run: apt update && apt install -y build-essential git curl pkg-config zip python3 ninja-build
+            - name: Install CMake
+              env:
+                MY_CMAKE_VERSION: 4.1.2
+              run: |
+                curl -LO https://github.com/Kitware/CMake/releases/download/v$MY_CMAKE_VERSION/cmake-$MY_CMAKE_VERSION-linux-x86_64.tar.gz
+                tar -xvzf cmake-$MY_CMAKE_VERSION-linux-x86_64.tar.gz
+                echo "$GITHUB_WORKSPACE/cmake-$MY_CMAKE_VERSION-linux-x86_64/bin" >> "$GITHUB_PATH"
             - name: Install MATLAB
               uses: matlab-actions/setup-matlab@v2
               with:
@@ -23,16 +34,15 @@ jobs:
             - name: Build OpenTelemetry-Matlab
               working-directory: opentelemetry-matlab
               run: |
-                  cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DWITH_OTLP_GRPC=ON -DWITH_OTLP_FILE=ON -DOTEL_MATLAB_VERSION=${{ github.ref_name }} -DCMAKE_INSTALL_PREFIX=${{ env.OPENTELEMETRY_MATLAB_INSTALL }}
+                  cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DWITH_OTLP_GRPC=ON -DWITH_OTLP_FILE=ON -DOTEL_MATLAB_VERSION=${{ github.ref_name }} -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/$OPENTELEMETRY_MATLAB_INSTALL_FOLDER
                   cmake --build build --config Release --target install
             - name: Compress into single artifact
-              working-directory: ${{ github.workspace }}
               run: tar -czf otel-matlab-ubuntu.tar.gz otel_matlab_install
             - name: Upload artifacts
               uses: actions/upload-artifact@v4
               with: 
                 name: otel-matlab-ubuntu.tar.gz
-                path: ${{ github.workspace }}/otel-matlab-ubuntu.tar.gz
+                path: ./otel-matlab-ubuntu.tar.gz
     build-windows:
         runs-on: windows-latest
         env:
@@ -99,16 +109,27 @@ jobs:
                 name: otel-matlab-${{ matrix.os }}.tar.gz
                 path: ${{ github.workspace }}/otel-matlab-${{ matrix.os }}.tar.gz
     nogrpc-ubuntu:     # without gRPC exporter
-        runs-on: ubuntu-22.04
+        runs-on: ubuntu-latest
+        container:
+          image: ubuntu:20.04
         env:
-            OPENTELEMETRY_MATLAB_INSTALL: "${{ github.workspace }}/otel_matlab_install"
+            OPENTELEMETRY_MATLAB_INSTALL_FOLDER: "otel_matlab_install"   # not including the context github.workspace since it doesn't work inside a container due to a bug
         steps:
             - name: Download OpenTelemetry-Matlab source
               uses: actions/checkout@v3
               with: 
                 path: opentelemetry-matlab
-            - name: Install ninja-build
-              run: sudo apt-get install ninja-build
+            - name: Install compiler and other tools
+              env:
+                DEBIAN_FRONTEND: "noninteractive"
+              run: apt update && apt install -y build-essential git curl pkg-config zip python3 ninja-build
+            - name: Install CMake
+              env:
+                MY_CMAKE_VERSION: 4.1.2
+              run: |
+                curl -LO https://github.com/Kitware/CMake/releases/download/v$MY_CMAKE_VERSION/cmake-$MY_CMAKE_VERSION-linux-x86_64.tar.gz
+                tar -xvzf cmake-$MY_CMAKE_VERSION-linux-x86_64.tar.gz
+                echo "$GITHUB_WORKSPACE/cmake-$MY_CMAKE_VERSION-linux-x86_64/bin" >> "$GITHUB_PATH"
             - name: Install MATLAB
               uses: matlab-actions/setup-matlab@v2
               with:
@@ -117,16 +138,15 @@ jobs:
             - name: Build OpenTelemetry-Matlab
               working-directory: opentelemetry-matlab
               run: |
-                  cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DWITH_OTLP_GRPC=OFF -DWITH_OTLP_FILE=ON -DOTEL_MATLAB_VERSION=${{ github.ref_name }} -DCMAKE_INSTALL_PREFIX=${{ env.OPENTELEMETRY_MATLAB_INSTALL }}
+                  cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DWITH_OTLP_GRPC=OFF -DWITH_OTLP_FILE=ON -DOTEL_MATLAB_VERSION=${{ github.ref_name }} -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/$OPENTELEMETRY_MATLAB_INSTALL_FOLDER
                   cmake --build build --config Release --target install
             - name: Compress into single artifact
-              working-directory: ${{ github.workspace }}
               run: tar -czf otel-matlab-nogrpc-ubuntu.tar.gz otel_matlab_install
             - name: Upload artifacts
               uses: actions/upload-artifact@v4
               with: 
                 name: otel-matlab-nogrpc-ubuntu.tar.gz
-                path: ${{ github.workspace }}/otel-matlab-nogrpc-ubuntu.tar.gz
+                path: ./otel-matlab-nogrpc-ubuntu.tar.gz
     nogrpc-windows:   # without gRPC exporter
         runs-on: windows-latest
         env:

README.md

@@ -6,11 +6,7 @@ MATLAB® interface to [OpenTelemetry™](https://opentelemetry.io/), base
 ### Status
 1. Tracing, metrics, and logs are all fully supported and tested on Windows®, Linux®, and macOS.
 2. On Linux, when running MATLAB R2025a or newer releases, the gRPC library used in the gRPC exporter in this package may conflict with the same library in MATLAB, causing MATLAB to crash. To avoid this issue, install otel-matlab-nogrpc.mltbx in [version 1.10.2](https://github.com/mathworks/OpenTelemetry-MATLAB/releases/tag/1.10.2), which excludes the gRPC exporter.
-3. If you are using [version 1.10.2](https://github.com/mathworks/OpenTelemetry-MATLAB/releases/tag/1.10.2) on Linux with MATLAB R2024a or older, you may run into an "Invalid MEX file" error due to an incompatible libstdc++ library. Define the environment variable LD_PRELOAD to point to the system libstdc++.so. For example, use the following command in a Bash shell on Ubuntu or Debian Linux.
-```
-export LD_PRELOAD="/lib/x86_64-linux-gnu/libstdc++.so.6"
-```
-4. OpenTelemetry currently does not support non-ASCII characters. Defining names or attributes with non-ASCII characters will cause the telemetry data to become invalid and fail to export.
+3. OpenTelemetry currently does not support non-ASCII characters. Defining names or attributes with non-ASCII characters will cause the telemetry data to become invalid and fail to export.
 
 ### MathWorks Products (https://www.mathworks.com)