feedback on Mex compiler and detect

Author: scivision

.github/workflows/ci-nojvm.yml

@@ -15,13 +15,20 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04,macos-latest,windows-latest]
+        os: [ubuntu-22.04, macos-latest, windows-latest]
         release: [latest]
         startup-options: ["-nojvm"]
 
     steps:
     - uses: actions/checkout@v4
 
+    # fixes `GLIBCXX_3.4.32' not found on run
+    - name: g++-10 for Linux
+      if: runner.os == 'Linux'
+      run: |
+        echo "CXX=g++-10" >> $GITHUB_ENV
+        echo "CC=gcc-10" >> $GITHUB_ENV
+
     - uses: ./.github/workflows/composite-install-matlab
 
     - uses: ./.github/workflows/composite-buildtool

.github/workflows/ci.yml

@@ -51,6 +51,13 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    # fixes `GLIBCXX_3.4.32' not found on run
+    - name: g++-10 for Linux
+      if: runner.os == 'Linux'
+      run: |
+        echo "CXX=g++-10" >> $GITHUB_ENV
+        echo "CC=gcc-10" >> $GITHUB_ENV
+
     - uses: ./.github/workflows/composite-install-matlab
 
     - uses: ./.github/workflows/composite-buildtool

.github/workflows/composite-buildtool/action.yml

@@ -13,14 +13,6 @@ runs:
       startup-options: ${{ matrix.startup-options }}
       tasks: check
 
-# fixes `GLIBCXX_3.4.32' not found on run
-  - name: g++-10 CXX for linux
-    if: runner.os == 'Linux'
-    shell: bash
-    run: |
-      echo "CXX=g++-10" >> $GITHUB_ENV
-      echo "CC=gcc-10" >> $GITHUB_ENV
-
   - name: Test task
     if: ${{ matrix.release >= 'R2022b' || startsWith(matrix.release, 'latest') }}
     uses: matlab-actions/run-build@v2

buildfile.m

@@ -5,15 +5,24 @@
 
 if ~isMATLABReleaseOlderThan("R2024b")
 
-  if ispc
-    compiler_opt = "COMPFLAGS=/EHsc /std:c++17";
+  cxx = mex.getCompilerConfigurations('c++');
+
+  disp("Mex using: " + cxx.Name + " " + cxx.Version)
+
+  compiler_opt = "CXXFLAGS=$CXXFLAGS -std=c++17";
+  % FIXME: Windows oneAPI
+  if startsWith(cxx.ShortName, "MSVCPP")
+    compiler_opt = "COMPFLAGS=$COMPFLAGS /std:c++17";
   elseif ismac
-    compiler_opt = "CXXFLAGS=-std=c++17";
-  elseif isunix
-    compiler_opt = "CXXFLAGS=-fPIC -std=c++17";
-  else
-    warning("Unsupported platform")
-    return
+    compiler_opt = "CXXFLAGS=$CXXFLAGS -std=c++17";
+  elseif isunix && cxx.ShortName == "g++"
+    compiler_opt = compiler_opt + " -fPIC";
+    % FIXME: update when desired GCC != 10 for newer Matlab
+    if isMATLABReleaseOlderThan("R2025b") && ~startsWith(cxx.Version, "10")
+      % https://www.mathworks.com/help/matlab/matlab_external/choose-c-or-c-compilers.html
+      warning("ensure the GCC version matches Matlab's expected version: GCC " + cxx_version + " detected")
+      return
+    end
   end
 
   root = plan.RootFolder;