# Cmake 3.30.2 bootstrap failure on MacOS with gcc and old Xcode SDK
**URL:** https://discourse.cmake.org/t/cmake-3-30-2-bootstrap-failure-on-macos-with-gcc-and-old-xcode-sdk/11579
**Category:** Development
**Created:** [September 3, 2024, 2:22pm UTC](https://discourse.cmake.org/t/cmake-3-30-2-bootstrap-failure-on-macos-with-gcc-and-old-xcode-sdk/11579 "2024-09-03T14:22:36Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@rhtownsend](https://discourse.cmake.org/u/rhtownsend)
#### Post date: [September 3, 2024, 2:22pm UTC](https://discourse.cmake.org/t/cmake-3-30-2-bootstrap-failure-on-macos-with-gcc-and-old-xcode-sdk/11579/1 "2024-09-03T14:22:36Z")
I’m trying to bootstrap Cmake 3.30.2 on a MacOS (14.6.1) Apple silicon system using gcc (13.3.0), but with a wrinkle: the gcc compiler was built against an old Xcode SDK (11.1) so that I can use it on older MacOS systems.
This seems to cause problems with the bootstrap, involving header files from the Xcode SDK. Here’s a snippet of output:
```auto
g++ -DCMAKE_BOOTSTRAP -DCMake_HAVE_CXX_MAKE_UNIQUE=1 -DCMake_HAVE_CXX_FILESYSTEM=1 -I/opt/sdk2-tmp/build/cmake-3.30.2/build/Bootstrap.cmk -I/opt/sdk2-tmp/build/cmake-3.30.2/Source -I/opt/sdk2-tmp/build/cmake-3.30.2/Source/LexerParser -I/opt/sdk2-tmp/build/cmake-3.30.2/Utilities/std -I/opt/sdk2-tmp/build/cmake-3.30.2/Utilities -c /opt/sdk2-tmp/build/cmake-3.30.2/Source/cmFindProgramCommand.cxx -o cmFindProgramCommand.o
In file included from /Applications/mesasdk/bin/../sysroot/usr/include/dispatch/dispatch.h:63,
from /Applications/mesasdk/bin/../sysroot/System/Library/Frameworks/CoreFoundation.framework/Headers/CFStream.h:20,
from /Applications/mesasdk/bin/../sysroot/System/Library/Frameworks/CoreFoundation.framework/Headers/CFPropertyList.h:18,
from /Applications/mesasdk/bin/../sysroot/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:76,
from /opt/sdk2-tmp/build/cmake-3.30.2/Source/cmFindProgramCommand.cxx:21:
/Applications/mesasdk/bin/../sysroot/usr/include/os/object.h:278:1: error: 'OS_ASSUME_PTR_ABI_SINGLE_BEGIN' does not name a type; did you mean 'DISPATCH_ASSUME_ABI_SINGLE_BEGIN'?
278 | OS_OBJECT_ASSUME_ABI_SINGLE_BEGIN
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/mesasdk/bin/../sysroot/usr/include/os/object.h:327:1: error: 'OS_ASSUME_PTR_ABI_SINGLE_END' does not name a type; did you mean 'OS_OBJECT_ASSUME_ABI_SINGLE_END'?
327 | OS_OBJECT_ASSUME_ABI_SINGLE_END
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /Applications/mesasdk/bin/../sysroot/usr/include/os/workgroup.h:29,
from /Applications/mesasdk/bin/../sysroot/usr/include/dispatch/dispatch.h:64:
/Applications/mesasdk/bin/../sysroot/usr/include/os/workgroup_base.h:65:1: error: 'OS_ASSUME_PTR_ABI_SINGLE_BEGIN' does not name a type; did you mean 'DISPATCH_ASSUME_ABI_SINGLE_BEGIN'?
65 | OS_WORKGROUP_ASSUME_ABI_SINGLE_BEGIN
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/mesasdk/bin/../sysroot/usr/include/os/workgroup_base.h:83:1: error: 'OS_ASSUME_PTR_ABI_SINGLE_END' does not name a type; did you mean 'OS_OBJECT_ASSUME_ABI_SINGLE_END'?
83 | OS_WORKGROUP_ASSUME_ABI_SINGLE_END
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/mesasdk/bin/../sysroot/usr/include/os/workgroup_interval.h:32:1: error: 'OS_ASSUME_PTR_ABI_SINGLE_BEGIN' does not name a type; did you mean 'DISPATCH_ASSUME_ABI_SINGLE_BEGIN'?
32 | OS_WORKGROUP_ASSUME_ABI_SINGLE_BEGIN
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/mesasdk/bin/../sysroot/usr/include/os/workgroup_interval.h:42:1: error: 'os_workgroup_t' does not name a type
42 | OS_WORKGROUP_SUBCLASS_DECL(os_workgroup_interval, os_workgroup, WorkGroupInterval);
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
```
(there are many more errors)
Would appreciate some guidance here!
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [July 19, 2025, 2:24pm UTC](https://discourse.cmake.org/t/cmake-3-30-2-bootstrap-failure-on-macos-with-gcc-and-old-xcode-sdk/11579/2 "2025-07-19T14:24:40Z")
You may need a newer gcc to use a newer SDK. I’d recommend using an old SDK (extracted from an appropriately aged Xcode) to target older platforms more reliably.