Deltares · BillSenior · Aug 6, 2026 · May 27, 2026 · May 27, 2026 · Jun 4, 2026
diff --git a/.github/workflows/build-and-test-workflow.yml b/.github/workflows/build-and-test-workflow.yml
@@ -47,7 +47,7 @@ jobs:
 
       - name: Install system-provided dependencies
         run: |
-          brew install boost doxygen libaec libomp
+          brew install boost doxygen gcc libaec libomp
 
       # Step: Set OpenMP environment variables (architecture-aware)
       - name: Set OpenMP environment variables
@@ -58,7 +58,7 @@ 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
@@ -114,7 +114,7 @@ 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 ${{ steps.paths.outputs.build_dir }} \
@@ -144,7 +144,7 @@ jobs:
           if [ -f "${{ 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 +15,15 @@ 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")
+
+    include(CheckCXXCompilerFlag)
+    check_cxx_compiler_flag("-Wno-character-conversion" SUPPORTS_WNO_CHARACTER_CONVERSION)
+
+    if(SUPPORTS_WNO_CHARACTER_CONVERSION)
+      # Disable warnings about implicit conversions between character types
+      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")

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
+         227           2
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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 +1,79 @@
+# C++20 translation of the SEPRAN mesh-generation library.
+# Replaces the original Fortran sources.
+
+set(target_name Sepran)
+
+
+# source directories
+set(SRC_DIR src)
+set(INC_DIR include)
+
+set(
+  TARGET_SRC_LIST
+  ${SRC_DIR}/SepranSort.cpp
+  ${SRC_DIR}/SepranGeometry.cpp
+  ${SRC_DIR}/SepranCurveIntersection.cpp
+  ${SRC_DIR}/SepranBoundary.cpp
+  ${SRC_DIR}/SepranTransform.cpp
+  ${SRC_DIR}/SepranTopology.cpp
+  ${SRC_DIR}/SepranFront.cpp
+  ${SRC_DIR}/SepranQuadratic.cpp
+  ${SRC_DIR}/Msho2d.cpp
+  ${SRC_DIR}/Mshoce.cpp
+)
+
+set(
+  TARGET_HEADER_LIST
+  ${INC_DIR}/Msho2d.hpp
+  ${INC_DIR}/Mshoce.hpp
+  ${INC_DIR}/SepranBoundary.hpp
+  ${INC_DIR}/SepranContext.hpp
+  ${INC_DIR}/SepranCurveIntersection.hpp
+  ${INC_DIR}/SepranFront.hpp
+  ${INC_DIR}/SepranGeometry.hpp
+  ${INC_DIR}/SepranQuadratic.hpp
+  ${INC_DIR}/SepranSort.hpp
+  ${INC_DIR}/SepranTopology.hpp
+  ${INC_DIR}/SepranTransform.hpp
+)
+
+add_library(${target_name} STATIC ${TARGET_SRC_LIST} ${TARGET_HEADER_LIST})
+
+# IMPROVEMENT: Explicitly include the include directory for cleaner downstream usage
+target_include_directories(${target_name}
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${INC_DIR}>
+    $<INSTALL_INTERFACE:include>
+)
+
+target_include_directories(${target_name} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_compile_features(${target_name} PUBLIC cxx_std_20)
+
+# Add precompiled headers to speed up compilation
+target_precompile_headers(${target_name}
+  PRIVATE
+    <algorithm>
+    <array>
+    <cassert>
+    <cmath>
+    <iostream>
+    <limits>
+    <map>
+    <memory>
+    <numeric>
+    <span>
+    <stdexcept>
+    <string>
+    <string_view>
+    <utility>
+    <vector>
+)
+
+set_target_properties(
+  ${target_name}
+  PROPERTIES
+    POSITION_INDEPENDENT_CODE ON
+)
+
+source_group("Source Files" FILES ${TARGET_HEADER_LIST}  ${TARGET_SRC_LIST})
diff --git a/extern/sepran/README.md b/extern/sepran/README.md
@@ -0,0 +1,10 @@
+# Sepran library
+## Information
+A Two-Dimensional mesh triangular generator for an area which is defined by a closed polygon.
+
+Library: https://repos.deltares.nl/repos/ds/trunk/guis/plugins_qt/packages/sepran/
+
+## Modifications
+1. All original Fortran source code was completely translated to standard C++.
+2. Although arrays on the C++ side can be indexed with a 0-based indexing, any index values assigned
+   must follow Fortran's 1-based indexing
Original file line number	Diff line number	Diff line change
		@@ -1 +1,2 @@
		add_subdirectory(triangle)
		add_subdirectory(sepran)