mex: try setting GCC= to get required compiler

Author: scivision

.github/workflows/ci-nojvm.yml

@@ -22,13 +22,6 @@ 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/ci.yml

@@ -32,13 +32,6 @@ 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/publish.yml

@@ -21,11 +21,6 @@ concurrency:
   group: "pages"
   cancel-in-progress: false
 
-# fixes `GLIBCXX_3.4.32' not found on run
-env:
-  CC: gcc-10
-  CXX: g++-10
-
 
 jobs:
 

buildfile.m

@@ -20,8 +20,9 @@
     % 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
+      % https://www.mathworks.com/help/matlab/matlab_external/change-default-gcc-compiler-on-linux-system.html
+
+      compiler_opt = "GCC=g++-10 " + compiler_opt;
     end
   end