Force -ld_classic when necessary?

Author: prj-

.github/workflows/full-mpich.yml

@@ -88,6 +88,12 @@ jobs:
 
       - name: Symlink GCC & Fortran
         run: ./etc/actions/macos/link_fortran.sh "$(uname -p)"
+
+      - name: Set ld_classic based on macOS version
+        run: |
+          if [ "${{ matrix.version }}" -ne "15" ]; then
+            echo "CXX=g++ -Wl,-ld_classic" >> $GITHUB_ENV
+          fi
           
       - name: Configure
         run: |

.github/workflows/full-openmpi.yml

@@ -80,6 +80,7 @@ jobs:
     runs-on: macos-${{ matrix.version }}
 
     env:
+      CXX: "g++ -Wl,-ld_classic"
       MPIRUN: mpirun
       MPICC: mpicc
       MPICXX: mpicxx

3rdparty/ff-petsc/Makefile

@@ -80,6 +80,19 @@ PETSC_DOWNLOAD += --download-superlu_dist
 PETSC_DOWNLOAD_C += --with-superlu_dist-dir=$(DIR_INSTALL_REAL)
 endif
 
+ifeq ($(DARWIN),Darwin)
+PETSC_DOWNLOAD += --download-mpich-device=ch4:ofi
+LD_CLASSIC = $(shell echo $(CXX) | grep -o "\-Wl,\-ld_classic")
+USE_DYLIBS = $(shell echo $(CXX) | grep -o "\-Wl,\-commons,use_dylibs")
+ifneq ($(LD_CLASSIC)$(USE_DYLIBS),)
+COMMON_FLAGS += LDFLAGS='$(LD_CLASSIC) $(USE_DYLIBS)'
+ifeq ($(MPICC)$(MPICXX),)
+CC := $(shell echo $(CC) | sed 's/-Wl,-ld_classic[ ]*//' | sed 's/-Wl,-commons,use_dylibs[ ]*//' | sed 's/[ ]*$$//')
+CXX := $(shell echo $(CXX) | sed 's/-Wl,-ld_classic[ ]*//' | sed 's/-Wl,-commons,use_dylibs[ ]*//' | sed 's/[ ]*$$//')
+endif
+endif
+endif
+
 ifeq ($(MPICC)$(MPICXX),)
 ifeq ($(WIN32DLLTARGET),)
 PETSC_DOWNLOAD += --with-cc='$(CC)' --with-cxx='$(CXX)' --download-mpich=https://www.mpich.org/static/downloads/4.3.0/mpich-4.3.0.tar.gz