Deltares · BillSenior · May 27, 2026 · May 27, 2026 · Jun 4, 2026 · Jun 4, 2026
diff --git a/.github/workflows/build-and-test-workflow.yml b/.github/workflows/build-and-test-workflow.yml
@@ -47,7 +47,25 @@ jobs:
 
       - name: Install system-provided dependencies
         run: |
-          brew install boost doxygen libaec libomp
+          brew install boost doxygen gcc libaec libomp
+
+      - name: Set Fortran compiler (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          GFORTRAN_BIN="$(command -v gfortran || true)"
+          if [ -z "$GFORTRAN_BIN" ]; then
+            HOMEBREW_PREFIX="$(brew --prefix)"
+            GFORTRAN_BIN="$(find "$HOMEBREW_PREFIX/bin" -maxdepth 1 \( -type f -o -type l \) -name 'gfortran-*' | sort -V | tail -n 1)"
+          fi
+
+          if [ -z "$GFORTRAN_BIN" ]; then
+            echo "Unable to locate Homebrew gfortran" >&2
+            exit 1
+          fi
+
+          echo "Using Fortran compiler: $GFORTRAN_BIN"
+          echo "FC=$GFORTRAN_BIN" >> "$GITHUB_ENV"
+          echo "F77=$GFORTRAN_BIN" >> "$GITHUB_ENV"
 
       # Step: Set OpenMP environment variables (architecture-aware)
       - name: Set OpenMP environment variables
@@ -58,7 +76,7 @@ jobs:
           else
             HOMEBREW_PREFIX="/usr/local"
           fi
-          
+
           echo "HOMEBREW_PREFIX=$HOMEBREW_PREFIX" >> $GITHUB_ENV
           echo "LDFLAGS=-L$HOMEBREW_PREFIX/opt/libomp/lib" >> $GITHUB_ENV
           echo "CPPFLAGS=-I$HOMEBREW_PREFIX/opt/libomp/include" >> $GITHUB_ENV
@@ -114,13 +132,14 @@ jobs:
             # Suppress unused parameter warnings on macOS 15 Intel runner (known platform-specific issue)
             SUPPRESS_PARAM_FLAG="-DSUPPRESS_UNUSED_PARAMETER_WARNING=ON"
           fi
-          
+
           cmake \
             -S ${{ github.workspace }} \
             -B ${{ steps.paths.outputs.build_dir }} \
             -DCMAKE_BUILD_TYPE=${{ inputs.build_type }} \
             -DCMAKE_PREFIX_PATH=${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c \
             -DCMAKE_INSTALL_PREFIX=${{ steps.paths.outputs.install_dir }} \
+            -DCMAKE_Fortran_COMPILER="$FC" \
             $SUPPRESS_PARAM_FLAG \
             -DOpenMP_C_FLAGS="-Xpreprocessor -fopenmp -I$HOMEBREW_PREFIX/opt/libomp/include" \
             -DOpenMP_CXX_FLAGS="-Xpreprocessor -fopenmp -I$HOMEBREW_PREFIX/opt/libomp/include" \
@@ -144,7 +163,7 @@ jobs:
           if [ -f "${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c/bin/libz.dylib" ]; then
             ln -sf libz.dylib ${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c/bin/libz.1.dylib
           fi
-          
+
           export DYLD_LIBRARY_PATH="${{ steps.paths.outputs.ext_deps_dir }}/netcdf-c/install/netcdf-c/bin:$DYLD_LIBRARY_PATH"
           ctest --test-dir ${{ steps.paths.outputs.build_dir }} \
                 -C ${{ inputs.build_type }} \

diff --git a/cmake/compiler_config.cmake b/cmake/compiler_config.cmake
@@ -15,6 +15,13 @@ if(APPLE)
     message(STATUS "Configuring build for macOS with ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER_VERSION}).")
     # Common warning and visibility flags
     add_compile_options("-fvisibility=hidden;-Wall;-Wextra;-pedantic;-Werror;-Wno-unused-function")
+
+    cmake_host_system_information(RESULT os_release QUERY OS_RELEASE)
+
+    if(os_release VERSION_GREATER_EQUAL "26.0")
+      add_compile_options("-Wno-character-conversion")
+    endif()
+
     # Conditionally suppress unused parameter warnings (used for platform-specific compiler issues)
     if(SUPPRESS_UNUSED_PARAMETER_WARNING)
       add_compile_options("-Wno-unused-parameter")
@@ -25,6 +32,8 @@ if(APPLE)
     # Optimization / debug flags
     add_compile_options("$<$<CONFIG:RELEASE>:-O2>")
     add_compile_options("$<$<CONFIG:DEBUG>:-g>")
+    # Disable warnings about implicit conversions between character types
+    # This is required because of a compatibility issue between clang++ and googletest
   else()
     message(FATAL_ERROR "Unsupported compiler on macOS. Supported: AppleClang/Clang. Found ${CMAKE_CXX_COMPILER_ID}.")
   endif()

diff --git a/data/test/data/northbank_001b.pol b/data/test/data/northbank_001b.pol
@@ -0,0 +1,235 @@
+*
+* Deltares, RGFGRID Version 7.03.00.77422 (Win64), Nov 30 2022, 15:52:41
+* File creation date: 2025-12-01, 21:04:21
+*
+* Coordinate System = Cartesian
+*
+L000001
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diff --git a/extern/CMakeLists.txt b/extern/CMakeLists.txt
@@ -1 +1,2 @@
 add_subdirectory(triangle)
+add_subdirectory(sepran)
diff --git a/extern/sepran/CMakeLists.txt b/extern/sepran/CMakeLists.txt
@@ -0,0 +1,34 @@
+# C++20 translation of the SEPRAN mesh-generation library.
+# Replaces the original Fortran sources.
+
+set(target_name Sepran)
+
+add_library(${target_name} STATIC)
+
+set(
+  TARGET_SRC_LIST
+  SepranSort.cpp
+  SepranGeometry.cpp
+  SepranCurveIntersection.cpp
+  SepranBoundary.cpp
+  SepranTransform.cpp
+  SepranTopology.cpp
+  SepranFront.cpp
+  SepranQuadratic.cpp
+  Msho2d.cpp
+  Mshoce.cpp
+)
+
+target_sources(${target_name} PRIVATE ${TARGET_SRC_LIST})
+
+target_include_directories(${target_name} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_compile_features(${target_name} PUBLIC cxx_std_20)
+
+set_target_properties(
+  ${target_name}
+  PROPERTIES
+    POSITION_INDEPENDENT_CODE ON
+)
+
+source_group("Source Files" FILES ${TARGET_SRC_LIST})
Original file line number	Diff line number	Diff line change
		@@ -1 +1,2 @@
		add_subdirectory(triangle)
		add_subdirectory(sepran)