From 1c2db890275f3db54242a8866c2ea50a496efb04 Mon Sep 17 00:00:00 2001
From: Tobias Hunger <tobias.hunger@qt.io>
Date: Tue, 24 Sep 2019 11:42:15 +0200
Subject: Write out a module description file

Write out a file with some JSON data to describe a module.

This file contains information on how that module has been built.

Change-Id: I8a604692663cbb7b76b96b97124130e30b822e4b
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
---
 cmake/ModuleDescription.json.in | 11 +++++++++++
 cmake/QtBaseGlobalTargets.cmake |  1 +
 cmake/QtBuild.cmake             | 20 ++++++++++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 cmake/ModuleDescription.json.in

diff --git a/cmake/ModuleDescription.json.in b/cmake/ModuleDescription.json.in
new file mode 100644
index 0000000000..e29f3f176d
--- /dev/null
+++ b/cmake/ModuleDescription.json.in
@@ -0,0 +1,11 @@
+{
+    "module_name": "${target}",
+    "version": "${CMAKE_PROJECT_VERSION}",
+    "built_with": {
+        "compiler_id": "${CMAKE_CXX_COMPILER_ID}",
+        "compiler_target": "${CMAKE_CXX_COMPILER_TARGET}",
+        "compiler_version": "${CMAKE_CXX_COMPILER_VERSION}",
+        "cross_compiled": ${cross_compilation},
+        "target_system": "${CMAKE_SYSTEM_NAME}"
+    }
+}
diff --git a/cmake/QtBaseGlobalTargets.cmake b/cmake/QtBaseGlobalTargets.cmake
index df3ceb88c0..691c56dfdb 100644
--- a/cmake/QtBaseGlobalTargets.cmake
+++ b/cmake/QtBaseGlobalTargets.cmake
@@ -174,6 +174,7 @@ qt_internal_export_modern_cmake_config_targets_file(TARGETS ${__export_targets}
 
 ## Install some QtBase specific CMake files:
 qt_copy_or_install(FILES
+                   cmake/ModuleDescription.json.in
                    cmake/QtBuild.cmake
                    cmake/QtCompilerFlags.cmake
                    cmake/QtCompilerOptimization.cmake
diff --git a/cmake/QtBuild.cmake b/cmake/QtBuild.cmake
index 3b9e912edb..1e00677cbe 100644
--- a/cmake/QtBuild.cmake
+++ b/cmake/QtBuild.cmake
@@ -35,6 +35,7 @@ set(INSTALL_SYSCONFDIR "etc/xdg" CACHE PATH
     "Settings used by Qt programs [PREFIX/etc/xdg]")
 set(INSTALL_EXAMPLESDIR "examples" CACHE PATH "Examples [PREFIX/examples]")
 set(INSTALL_TESTSDIR "tests" CACHE PATH "Tests [PREFIX/tests]")
+set(INSTALL_DESCRIPTIONSDIR "${INSTALL_DATADIR}/modules" CACHE PATH "Module description files directory")
 
 # The variables might have already been set in QtBuildInternalsExtra.cmake if the file is included
 # while building a new module and not QtBase. In that case, stop overriding the value.
@@ -63,6 +64,23 @@ SET(CMAKE_INSTALL_RPATH "${_default_install_rpath}" CACHE PATH "RPATH for instal
 # which point to directories outside the build tree to the install RPATH
 SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 
+# Generate a module description file based on the template in ModuleDescription.json.in
+function(qt_describe_module target)
+    set(path_suffix "${INSTALL_DESCRIPTIONSDIR}")
+    qt_path_join(build_dir ${QT_BUILD_DIR} ${path_suffix})
+    qt_path_join(install_dir ${QT_INSTALL_DIR} ${path_suffix})
+
+    set(descfile_in "${QT_CMAKE_DIR}/ModuleDescription.json.in")
+    set(descfile_out "${build_dir}/${target}.json")
+    set(cross_compilation "false")
+    if(CMAKE_CROSSCOMPILE)
+        set(cross_compilation "true")
+    endif()
+    configure_file("${descfile_in}" "${descfile_out}")
+
+    qt_install(FILES "${descfile_out}" DESTINATION "${install_dir}")
+endfunction()
+
 function(qt_setup_tool_path_command)
     if(NOT WIN32)
         return()
@@ -1632,6 +1650,8 @@ set(QT_CMAKE_EXPORT_NAMESPACE ${QT_CMAKE_EXPORT_NAMESPACE})")
     if(NOT ${arg_NO_PRIVATE_MODULE})
         target_include_directories("${target_private}" INTERFACE ${interface_includes})
     endif()
+
+    qt_describe_module(${target})
 endfunction()
 
 function(qt_export_tools module_name)
-- 
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