CMake: Fix argument passing for configure.bat / qt-configure-module.bat

Passing arguments with equal signs was broken for configure.bat and
qt-configure-module.bat. An argument FOO=BAR was split at = and written
as
    FOO
    BAR
to config.opt, breaking every attempt of assigning CMake variables.

We must not iterate over %* in batch files to avoid splitting arguments
at equal signs. Instead, pass %* unmodified to a CMake script that
writes config.opt.

Fixes: QTBUG-88019
Change-Id: I7c743a206961d1ed168f2313f864905f6b345b49
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

bin/qt-configure-module.bat.in

@@ -17,18 +17,9 @@ if not exist "%module_root%\CMakeLists.txt" (
     exit /b 1
 )
 
-echo. > "config.opt"
-set first_iteration=indeed
-for %%a in (%*) do (
-    if defined first_iteration (
-        :: Drop the first argument, which is the module root.
-        set first_iteration=
-    ) else (
-        echo %%a >> "config.opt"
-    )
-)
-
 set cmake_scripts_dir=%script_dir_path%\@__relative_path_to_cmake_scripts_dir@
+call "%script_dir_path%"\qt-cmake.bat -DSKIP_ARGS=1 -DOUT_FILE=config.opt ^
+    -P "%cmake_scripts_dir%\QtWriteArgsFile.cmake" %*
 call "%script_dir_path%"\qt-cmake-private.bat -DOPTFILE=config.opt -DMODULE_ROOT="%module_root%" ^
     -DCMAKE_COMMAND="%script_dir_path%\qt-cmake-private.bat" ^
     -P "%cmake_scripts_dir%\QtProcessConfigureArgs.cmake"

cmake/QtBaseGlobalTargets.cmake

@@ -216,6 +216,7 @@ qt_copy_or_install(FILES
                    cmake/QtToolchainHelpers.cmake
                    cmake/QtToolHelpers.cmake
                    cmake/QtWrapperScriptHelpers.cmake
+                   cmake/QtWriteArgsFile.cmake
     DESTINATION "${__GlobalConfig_install_dir}"
 )
 

cmake/QtWriteArgsFile.cmake

@@ -0,0 +1,31 @@
+# This script writes its arguments to the file determined by OUT_FILE.
+# Each argument appears on a separate line.
+# This is used for writing the config.opt file.
+#
+# This script takes the following arguments:
+# OUT_FILE: The output file.
+# SKIP_ARGS: Number of arguments to skip from the front of the arguments list.
+
+# Look for the -P argument to determine the start of the actual script arguments
+math(EXPR stop "${CMAKE_ARGC} - 1")
+set(start 0)
+foreach(i RANGE 1 ${stop})
+    if(CMAKE_ARGV${i} STREQUAL "-P")
+        math(EXPR start "${i} + 2")
+        break()
+    endif()
+endforeach()
+
+# Skip arguments if requested
+if(DEFINED SKIP_ARGS)
+    math(EXPR start "${start} + ${SKIP_ARGS}")
+endif()
+
+# Write config.opt
+set(content "")
+if(start LESS_EQUAL stop)
+    foreach(i RANGE ${start} ${stop})
+        string(APPEND content "${CMAKE_ARGV${i}}\n")
+    endforeach()
+endif()
+file(WRITE "${OUT_FILE}" "${content}")

configure.bat

@@ -317,8 +317,7 @@ goto :eof
 
 rem Write config.opt if we're not currently -redo'ing
 if "%rargs%" == "" (
-    if exist "%TOPQTDIR%\config.opt" del "%TOPQTDIR%\config.opt"
+    cmake -DOUT_FILE=config.opt -P "%QTSRC%\cmake\QtWriteArgsFile.cmake" %*
-    for %%a in (%ARGS%) do echo %%a >> "%TOPQTDIR%\config.opt"
 )
 
 rem Launch CMake-based configure