Fix framework path for *_header_check targets

When building a Qt module against an installer-provided Qt on macOS, the
module pulls in the headersclean feature that creates the *_header_check
targets. Those targets try to compile the public headers of the module,
and the compilation command contains the -iframework argument. That
-iframework argument is supposed to point to the directory where the Qt
libs are installed. However, it pointed to the original
CMAKE_INSTALL_PREFIX of the machine where Qt was packaged.

Use the QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX variable instead
that contains the real installation location, even for an
installer-provided Qt.

Fixes: QTBUG-90402
Change-Id: I27de8b3cc816488c2716042383b334d5c421452d
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit bd8d74e0e265297d61fe3b42f71a282bf381c379)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/cmake/QtHeadersClean.cmake b/cmake/QtHeadersClean.cmake
index e9cd956d2e..9cb11dddd1 100644
--- a/cmake/QtHeadersClean.cmake
+++ b/cmake/QtHeadersClean.cmake
@@ -157,7 +157,7 @@ function(qt_internal_add_headers_clean_target
             # For some reason CMake doesn't generate -iframework flags from the INCLUDE_DIRECTORIES
             # generator expression we provide, so pass it explicitly and hope for the best.
             list(APPEND framework_includes
-                 "-iframework" "${CMAKE_INSTALL_PREFIX}/${INSTALL_LIBDIR}")
+                 "-iframework" "${QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX}/${INSTALL_LIBDIR}")
         endif()
 
         foreach(header ${hclean_headers})