From 4f0e4639128a281cebbe8ad76df00fb9d4fc0c20 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Fri, 14 Feb 2025 14:11:25 +0100
Subject: [PATCH] fix compilation on non fully c++2- compliant

---
 .../test/Triangulation_3/CMakeLists.txt        | 18 +++++++++++-------
 .../test/Triangulation_3/cdt_3_from_off.cpp    |  4 ++++
 ...t_insert_constrained_edge_from_EDG_file.cpp |  2 ++
 ...t_insert_constrained_edge_from_OFF_file.cpp |  2 ++
 4 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/Triangulation_3/test/Triangulation_3/CMakeLists.txt b/Triangulation_3/test/Triangulation_3/CMakeLists.txt
index 62241137758..d1e0a365a38 100644
--- a/Triangulation_3/test/Triangulation_3/CMakeLists.txt
+++ b/Triangulation_3/test/Triangulation_3/CMakeLists.txt
@@ -51,10 +51,12 @@ target_link_libraries(cdt_3_from_off PRIVATE CDT_3_dependencies)
 create_single_source_cgal_program( "cdt_3_from_off_with_Epeck.cpp")
 target_link_libraries(cdt_3_from_off_with_Epeck PRIVATE CDT_3_dependencies)
 
-add_executable(cdt_3_from_off_CGAL_DEBUG_CDT_3 cdt_3_from_off)
-target_compile_definitions(cdt_3_from_off_CGAL_DEBUG_CDT_3 PRIVATE CGAL_DEBUG_CDT_3=255)
-target_link_libraries(cdt_3_from_off_CGAL_DEBUG_CDT_3 PRIVATE CDT_3_dependencies)
-cgal_add_test(cdt_3_from_off_CGAL_DEBUG_CDT_3)
+if(cxx_std_20 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+  add_executable(cdt_3_from_off_CGAL_DEBUG_CDT_3 cdt_3_from_off)
+  target_compile_definitions(cdt_3_from_off_CGAL_DEBUG_CDT_3 PRIVATE CGAL_DEBUG_CDT_3=255)
+  target_link_libraries(cdt_3_from_off_CGAL_DEBUG_CDT_3 PRIVATE CDT_3_dependencies)
+  cgal_add_test(cdt_3_from_off_CGAL_DEBUG_CDT_3)
+endif()
 
 add_executable(test_CDT_3_insert_constrained_edge_from_EDG_file cdt_test_insert_constrained_edge_from_EDG_file.cpp)
 target_link_libraries(test_CDT_3_insert_constrained_edge_from_EDG_file PRIVATE CDT_3_dependencies)
@@ -151,9 +153,11 @@ CGAL_add_cdt3_from_local_off_test(error_mesh-p_not_equal_0-min2)
 
 include(./Thingi10k-CDT.cmake)
 
-add_test(NAME "execution   of  cdt_3_from_off_CGAL_DEBUG_CDT_3 3torus" COMMAND cdt_3_from_off_CGAL_DEBUG_CDT_3 ${CGAL_DATA_DIR}/meshes/3torus.off)
-cgal_add_compilation_test(cdt_3_from_off_CGAL_DEBUG_CDT_3)
-cgal_setup_test_properties("execution   of  cdt_3_from_off_CGAL_DEBUG_CDT_3 3torus" cdt_3_from_off_CGAL_DEBUG_CDT_3)
+if(cxx_std_20 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+  add_test(NAME "execution   of  cdt_3_from_off_CGAL_DEBUG_CDT_3 3torus" COMMAND cdt_3_from_off_CGAL_DEBUG_CDT_3 ${CGAL_DATA_DIR}/meshes/3torus.off)
+  cgal_add_compilation_test(cdt_3_from_off_CGAL_DEBUG_CDT_3)
+  cgal_setup_test_properties("execution   of  cdt_3_from_off_CGAL_DEBUG_CDT_3 3torus" cdt_3_from_off_CGAL_DEBUG_CDT_3)
+endif()
 
 get_directory_property(all_tests TESTS)
 foreach(test ${all_tests})
diff --git a/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp b/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
index 48940f3b25e..1a92679db60 100644
--- a/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
+++ b/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
@@ -1,3 +1,7 @@
+#if defined(CGAL_DEBUG_CDT_3) && !__has_include(<format>)
+#undef CGAL_DEBUG_CDT_3
+#endif
+
 // #define CGAL_CDT_2_DEBUG_INTERSECTIONS 1
 #define NO_TRY_CATCH 1
 // #define CGAL_DEBUG_CDT_3 1
diff --git a/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_EDG_file.cpp b/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_EDG_file.cpp
index 3d8bfc87888..b7ce41f9ec6 100644
--- a/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_EDG_file.cpp
+++ b/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_EDG_file.cpp
@@ -1,4 +1,6 @@
+#if __has_include(<format>)
 #define CGAL_DEBUG_CDT_3 1
+#endif
 #define CGAL_TRIANGULATION_CHECK_EXPENSIVE 1
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Delaunay_triangulation_3.h>
diff --git a/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_OFF_file.cpp b/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_OFF_file.cpp
index c79599e7141..7a58a1f5667 100644
--- a/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_OFF_file.cpp
+++ b/Triangulation_3/test/Triangulation_3/cdt_test_insert_constrained_edge_from_OFF_file.cpp
@@ -1,4 +1,6 @@
+#if __has_include(<format>)
 #define CGAL_DEBUG_CDT_3 1
+#endif
 #define CGAL_TRIANGULATION_CHECK_EXPENSIVE 1
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Delaunay_triangulation_3.h>