CMakeLists.txt

@@ -220,9 +220,7 @@ if (MSVC)
     # /bigobj (Increase Number of Sections in .Obj file)
     # error C3859: virtual memory range for PCH exceeded; please recompile with a command line option of '-Zm90' or greater
     # Generate symbols at every build target, even for the release.
-	# -Zm520 fixes error C3859 but forces the compiler to pre-allocate that memory for every translation unit regardless
-	# combining /Zi with /FS frees up a significant amount of memory pressure across all parallel compile jobs and makes /MP faster overall.
-    add_compile_options(-bigobj /Zi /FS)
+    add_compile_options(-bigobj -Zm520 /Zi)
     # Disable STL4007: Many result_type typedefs and all argument_type, first_argument_type, and second_argument_type typedefs are deprecated in C++17.
     #FIXME Remove this line after eigen library adapts to the new C++17 adaptor rules.
     add_compile_options(-D_SILENCE_CXX17_ADAPTOR_TYPEDEFS_DEPRECATION_WARNING)
@@ -233,11 +231,6 @@ if (MSVC)
     # Disable warnings on comparison of unsigned and signed
     # C4018: signed/unsigned mismatch
     add_compile_options(/wd4018)
-    # Prevent linker restart when TBB (or other deps) built with /GL are linked
-	# Make your full (clean) build slower because it enables link-time code generation across all translation units.
-	# helps incremental builds by preventing the double-link restart from TBB
-    set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS} /LTCG")
-    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /LTCG")
 endif ()
 
 if (${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang" AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER 15)
@@ -371,6 +364,28 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
 if (APPLE)
     message("OS X SDK Path: ${CMAKE_OSX_SYSROOT}")
+    # On the Xcode 26 SDK (newer libc++), several Find modules for system libraries
+    # (ZLIB, EXPAT, BZip2, Iconv) resolve their *_INCLUDE_DIR to "<sdk>/usr/include".
+    # When that C-header directory is passed as an explicit -isystem path it shadows
+    # libc++'s own <math.h>/<stddef.h> wrappers, so the C signbit()/isnan() macros leak
+    # into <cmath> and break __math/traits.h ("expected unqualified-id"). Register the
+    # SDK's usr/include as an implicit include dir so CMake never emits it explicitly;
+    # the compiler still searches it via -isysroot, so nothing is lost.
+    set(_orca_sdk_path "${CMAKE_OSX_SYSROOT}")
+    if (NOT IS_ABSOLUTE "${_orca_sdk_path}")
+        if (_orca_sdk_path STREQUAL "")
+            set(_orca_sdk_path "macosx")
+        endif ()
+        execute_process(COMMAND xcrun --sdk "${_orca_sdk_path}" --show-sdk-path
+                        OUTPUT_VARIABLE _orca_sdk_path
+                        OUTPUT_STRIP_TRAILING_WHITESPACE
+                        ERROR_QUIET)
+    endif ()
+    if (_orca_sdk_path AND EXISTS "${_orca_sdk_path}/usr/include")
+        list(APPEND CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES   "${_orca_sdk_path}/usr/include")
+        list(APPEND CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES "${_orca_sdk_path}/usr/include")
+        message(STATUS "Marked ${_orca_sdk_path}/usr/include as implicit include dir (libc++ header-order fix)")
+    endif ()
     if (CMAKE_OSX_DEPLOYMENT_TARGET)
         message("OS X Deployment Target: ${CMAKE_OSX_DEPLOYMENT_TARGET}")
     else ()
@@ -434,7 +449,15 @@ if (NOT MSVC AND ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMP
 
     if((${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang") AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER 15)
         include(CheckCXXCompilerFlag)
+        # Probe with -Werror so an "unknown warning option" diagnostic fails the check.
+        # Xcode 26+ clang dropped the enum-constexpr-conversion warning name; without
+        # -Werror the probe only warns and yields a false positive, and the leftover
+        # -Wno-error=enum-constexpr-conversion then becomes fatal in sub-projects built
+        # with -Werror (e.g. bundled Clipper2).
+        set(_orca_saved_required_flags "${CMAKE_REQUIRED_FLAGS}")
+        string(APPEND CMAKE_REQUIRED_FLAGS " -Werror")
         check_cxx_compiler_flag(-Wno-error=enum-constexpr-conversion HAS_WNO_ERROR_ENUM_CONSTEXPR_CONV)
+        set(CMAKE_REQUIRED_FLAGS "${_orca_saved_required_flags}")
         if(HAS_WNO_ERROR_ENUM_CONSTEXPR_CONV)
             add_compile_options(-Wno-error=enum-constexpr-conversion)
         endif()
@@ -941,6 +964,9 @@ set (CPACK_PACKAGE_ICON "${CMAKE_SOURCE_DIR}/resources/images\\\\OrcaSlicer.ico"
 set (CPACK_NSIS_MUI_ICON "${CPACK_PACKAGE_ICON}")
 set (CPACK_NSIS_MUI_UNIICON "${CPACK_PACKAGE_ICON}")
 set (CPACK_NSIS_INSTALLED_ICON_NAME  "$INSTDIR\\\\orca-slicer.exe")
+set(CPACK_NSIS_EXTRA_INSTALL_COMMANDS "
+    CreateShortCut \\\"$DESKTOP\\\\OrcaSlicer.lnk\\\" \\\"$INSTDIR\\\\orca-slicer.exe\\\"
+")
 set (CPACK_PACKAGE_CHECKSUM SHA256)
 set (CPACK_PACKAGE_INSTALL_REGISTRY_KEY "OrcaSlicer")
 set (CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL ON)

README.md

@@ -20,6 +20,7 @@ Pre-built [OrcaSlicer](https://github.com/SoftFever/OrcaSlicer) binaries that bu
 - **[PR #13529](https://github.com/SoftFever/OrcaSlicer/pull/13529)** — Anycubic Kobra X printer profiles
 - **[PR #13677](https://github.com/SoftFever/OrcaSlicer/pull/13677)** — Kobra X G-code fix
 - **[PR #13719](https://github.com/SoftFever/OrcaSlicer/pull/13719)** — Vendor + name matching for Moonraker filament sync
+- **[PR #13996](https://github.com/OrcaSlicer/OrcaSlicer/pull/13996)** - Fix: build under MacOS 26 SDK
 - KX-specific filament-hint patches (unique `filament_id` for user presets, 3-pass matching, sub-brands)
 
 ---