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iOS: Set LD_ENTRY_POINT for generated Xcode project

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We normally override the entrypoint to _qt_main_wrapper via the -e flag
to the linker, but if a Swift file is added to the Xcode project, Xcode
does some magic, building the app as a shared library, and wrapping it
with the Swift code into a custom executable. The -e flag will then be
a noop when linking our shared library.

To work around this we set the custom LD_ENTRY_POINT Xcode build setting,
which triggers Xcode to pass -e when linking the wrapper-executable.

This works in practice, but produces a warning on the console that the
entrypoint is not found, which has been reported as FB16519113.

Fixes: QTBUG-133577
Pick-to: 6.8
Change-Id: I9d8310b39ac5a4900693df55c2e5bfa346c0300a
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
(cherry picked from commit 430ba7c0f826ee6f91fbfdc861525cb62b8e725c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Tor Arne Vestbø 2025-02-18 17:20:06 +01:00 committed by Qt Cherry-pick Bot
parent 4488dfcbf6
commit 9fbb8e0090
2 changed files with 27 additions and 0 deletions
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21
cmake/QtPublicAppleHelpers.cmake
View File

@ -754,6 +754,25 @@ function(_qt_internal_set_ios_simulator_arch target)
"x86_64")
endfunction()
function(_qt_internal_set_xcode_entrypoint_attribute target entrypoint)
if(CMAKE_XCODE_ATTRIBUTE_LD_ENTRY_POINT
OR QT_NO_SET_XCODE_LD_ENTRY_POINT)
return()
endif()
get_target_property(existing_entrypoint
"${target}" XCODE_ATTRIBUTE_LD_ENTRY_POINT)
if(NOT existing_entrypoint MATCHES "-NOTFOUND")
return()
endif()
set_target_properties("${target}"
PROPERTIES
"XCODE_ATTRIBUTE_LD_ENTRY_POINT"
"${entrypoint}")
endfunction()
# Export Apple platform sdk and xcode version requirements to Qt6ConfigExtras.cmake.
# Always exported, even on non-Apple platforms, so that we can use them when building
# documentation.
@ -1022,6 +1041,8 @@ function(_qt_internal_finalize_ios_app target)
_qt_internal_set_xcode_targeted_device_family("${target}")
_qt_internal_set_xcode_bitcode_enablement("${target}")
_qt_internal_set_ios_simulator_arch("${target}")
_qt_internal_set_xcode_entrypoint_attribute("${target}" "_qt_main_wrapper")
endfunction()
function(_qt_internal_finalize_macos_app target)

6
mkspecs/features/uikit/default_post.prf
View File

@ -48,6 +48,12 @@ macx-xcode {
QMAKE_MAC_XCODE_SETTINGS += supported_platforms
}
# Override the entry point explicitly, in case a Swift file is
# added to the Xcode project
ld_entry_point.name = LD_ENTRY_POINT
ld_entry_point.value = _qt_main_wrapper
QMAKE_MAC_XCODE_SETTINGS += ld_entry_point
# In a simulator specific build the device config will set the SDK
# to the simulator SDK, but for Xcode we always want the SDKROOT
# to be the device SDK.