CMake: Fix build with custom INSTALL_INCLUDEDIR

The include directory in Qt's build directory is always named
"include", no matter what the value of INSTALL_INCLUDEDIR is. The main
reason is that the name "include" is hard-coded in syncqt.

The INSTALL_INCLUDEDIR variable must only affect the installation
location of headers.

Fixes: QTBUG-85893
Change-Id: I5367bc589cba129eb41817e2b58d470f730bb5ac
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

3 files changed, 13 insertions, 14 deletions

diff --git a/cmake/QtBaseGlobalTargets.cmake b/cmake/QtBaseGlobalTargets.cmake
index 1e5de239d6..d845de8892 100644
--- a/cmake/QtBaseGlobalTargets.cmake
+++ b/cmake/QtBaseGlobalTargets.cmake
@@ -4,7 +4,7 @@ add_library(Qt::Platform ALIAS Platform)
 target_include_directories(Platform
     INTERFACE
     $<BUILD_INTERFACE:${QT_PLATFORM_DEFINITION_DIR_ABSOLUTE}>
-    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/${INSTALL_INCLUDEDIR}>
+    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
     $<INSTALL_INTERFACE:${QT_PLATFORM_DEFINITION_DIR}>
     $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}>
     )
@@ -276,8 +276,8 @@ qt_install(PROGRAMS "${QT_BUILD_DIR}/${INSTALL_BINDIR}/${__qt_cmake_install_scri
 ## files always lived in Qt::Core, so we keep it that way
 add_library(GlobalConfig INTERFACE)
 target_include_directories(GlobalConfig INTERFACE
-    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/${INSTALL_INCLUDEDIR}>
-    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/${INSTALL_INCLUDEDIR}/QtCore>
+    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
+    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include/QtCore>
     $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}>
     $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}/QtCore>
 )
@@ -308,8 +308,8 @@ add_library(Qt::GlobalConfig ALIAS GlobalConfig)
 add_library(GlobalConfigPrivate INTERFACE)
 target_link_libraries(GlobalConfigPrivate INTERFACE GlobalConfig)
 target_include_directories(GlobalConfigPrivate INTERFACE
-    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/${INSTALL_INCLUDEDIR}/QtCore/${PROJECT_VERSION}>
-    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/${INSTALL_INCLUDEDIR}/QtCore/${PROJECT_VERSION}/QtCore>
+    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include/QtCore/${PROJECT_VERSION}>
+    $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include/QtCore/${PROJECT_VERSION}/QtCore>
     $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}/QtCore/${PROJECT_VERSION}>
     $<INSTALL_INTERFACE:${INSTALL_INCLUDEDIR}/QtCore/${PROJECT_VERSION}/QtCore>
 )
diff --git a/cmake/QtBuild.cmake b/cmake/QtBuild.cmake
index d44d3c9028..a20531e3cc 100644
--- a/cmake/QtBuild.cmake
+++ b/cmake/QtBuild.cmake
@@ -1843,8 +1843,8 @@ function(qt_internal_module_info result target)
     string(REPLACE "." "_" define "${define}")
     set("${result}_upper" "${upper}" PARENT_SCOPE)
     set("${result}_lower" "${lower}" PARENT_SCOPE)
-    set("${result}_repo_include_dir" "${QT_BUILD_DIR}/${INSTALL_INCLUDEDIR}" PARENT_SCOPE)
-    set("${result}_include_dir" "${QT_BUILD_DIR}/${INSTALL_INCLUDEDIR}/${module}" PARENT_SCOPE)
+    set("${result}_repo_include_dir" "${QT_BUILD_DIR}/include" PARENT_SCOPE)
+    set("${result}_include_dir" "${QT_BUILD_DIR}/include/${module}" PARENT_SCOPE)
     set("${result}_define" "${define}" PARENT_SCOPE)
 endfunction()
 
@@ -2184,7 +2184,7 @@ function(qt_install_injections target build_dir install_dir)
         # ${qtbase_build_dir}.
         #
         # In the code below, ${some_prefix} == ${build_dir}.
-        set(lower_case_forwarding_header_path "${build_dir}/${INSTALL_INCLUDEDIR}/${module}")
+        set(lower_case_forwarding_header_path "${build_dir}/include/${module}")
         if(destinationdir)
             string(APPEND lower_case_forwarding_header_path "/${destinationdir}")
         endif()
@@ -2219,7 +2219,7 @@ function(qt_install_injections target build_dir install_dir)
 
         # Generate UpperCaseNamed forwarding headers (part 3).
         foreach(fwd_hdr ${fwd_hdrs})
-            set(upper_case_forwarding_header_path "${INSTALL_INCLUDEDIR}/${module}")
+            set(upper_case_forwarding_header_path "include/${module}")
             if(destinationdir)
                 string(APPEND upper_case_forwarding_header_path "/${destinationdir}")
             endif()
@@ -2234,8 +2234,7 @@ function(qt_install_injections target build_dir install_dir)
                     "${build_dir}/${upper_case_forwarding_header_path}/${fwd_hdr}")
             else()
                 # Install the forwarding header.
-                qt_path_join(install_destination
-                            ${install_dir} ${upper_case_forwarding_header_path})
+                qt_path_join(install_destination "${install_dir}" "${INSTALL_INCLUDEDIR}" ${module})
                 qt_install(FILES "${build_dir}/${upper_case_forwarding_header_path}/${fwd_hdr}"
                         DESTINATION ${install_destination} OPTIONAL)
             endif()
@@ -2782,7 +2781,7 @@ function(qt_add_module target)
         set_target_properties("${target}" PROPERTIES INTERFACE_MODULE_HAS_HEADERS ON)
 
         ### FIXME: Can we replace headers.pri?
-        set(module_include_dir "${QT_BUILD_DIR}/${INSTALL_INCLUDEDIR}/${module_include_name}")
+        set(module_include_dir "${QT_BUILD_DIR}/include/${module_include_name}")
         qt_read_headers_pri("${module_include_dir}" "module_headers")
         set(module_depends_header "${module_include_dir}/${module}Depends")
         if(is_framework)
@@ -4279,7 +4278,7 @@ function(qt_add_test name)
         set(private_includes
             "${CMAKE_CURRENT_SOURCE_DIR}"
             "${CMAKE_CURRENT_BINARY_DIR}"
-            "$<BUILD_INTERFACE:${QT_BUILD_DIR}/${INSTALL_INCLUDEDIR}>"
+            "$<BUILD_INTERFACE:${QT_BUILD_DIR}/include>"
              ${arg_INCLUDE_DIRECTORIES}
         )
 
diff --git a/cmake/QtPostProcess.cmake b/cmake/QtPostProcess.cmake
index f31e429233..2ad06a5a7b 100644
--- a/cmake/QtPostProcess.cmake
+++ b/cmake/QtPostProcess.cmake
@@ -1,5 +1,5 @@
 function(qt_internal_write_depends_file module)
-    set(outfile "${QT_BUILD_DIR}/${INSTALL_INCLUDEDIR}/${module}/${module}Depends")
+    set(outfile "${QT_BUILD_DIR}/include/${module}/${module}Depends")
     set(contents "/* This file was generated by cmake with the info from ${module} target. */\n")
     string(APPEND contents "#ifdef __cplusplus /* create empty PCH in C mode */\n")
     foreach (m ${ARGN})