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cmake: Persist macOS SDK name, to work around CMake 4.x 

CMake 4 stopped passing explicit toolchain and SDK paths, which
results in lots of sharp corners.

For example, with xcode-select pointing to /Applications/Xcode.app
but with Xcode command line tools installed, CMake will build with
/usr/bin/c++, which xcrun resolves to the Xcode toolchain, but
as CMake doesn't pass a sysroot, it ends up using the command line
tools SDK. This is bad and surprising when the selected Xcode
version's SDKs doesn't match the command line tools.

CMake 4.0.2 was supposed to fix this, but it seemingly doesn't
work. As a workaround, set CMAKE_OSX_SYSROOT for macOS as well,
which triggers CMake or xcrun to pass a sysroot, giving us what
we want.

Pick-to: 6.10 6.9 6.8 6.5
Change-Id: Ia6d051477a48c4c8e5e90feae67cc8d2734d8e1b
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
This commit is contained in:
Tor Arne Vestbø 2025-07-31 16:47:47 +02:00
parent 1e367f2f8c
commit e462567183
2 changed files with 6 additions and 1 deletions
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5
cmake/QtAutoDetectHelpers.cmake
View File

@ -248,6 +248,11 @@ function(qt_auto_detect_apple)
if(QT_APPLE_SDK)
set(CMAKE_OSX_SYSROOT "${QT_APPLE_SDK}" CACHE STRING "")
elseif(NOT CMAKE_SYSTEM_NAME)
# Persist SDK name for macOS builds, since CMake 4.x will pick arbitrary
# SDK paths, ignoring xcode-select, if not given an explicit SDK.
_qt_internal_get_apple_sdk_name(sdk_name)
set(CMAKE_OSX_SYSROOT "${sdk_name}" CACHE STRING "")
endif()
if(CMAKE_SYSTEM_NAME STREQUAL iOS OR CMAKE_SYSTEM_NAME STREQUAL visionOS)

2
cmake/QtToolchainHelpers.cmake
View File

@ -168,7 +168,7 @@ endif()")
set(cmake_sysroot_name "$CACHE{CMAKE_OSX_SYSROOT}")
list(LENGTH CMAKE_OSX_ARCHITECTURES _qt_osx_architectures_count)
if(cmake_sysroot_name AND NOT _qt_osx_architectures_count GREATER 1 AND UIKIT)
if(cmake_sysroot_name AND (MACOS OR (UIKIT AND NOT _qt_osx_architectures_count GREATER 1)))
list(APPEND init_platform "
if(NOT DEFINED CMAKE_OSX_SYSROOT)
set(CMAKE_OSX_SYSROOT \"${cmake_sysroot_name}\" CACHE STRING \"\")