CMake: Fix configure -redo for top-level builds

When re-doing in a top-level build, we did not read the config.opt file
from the top-level directory.

Also, the config.opt file should not contain the -top-level argument.
This is an internal option, and on Windows, it was already missing. The
information whether we're doing a top-level build is now passed in the
CMake variable TOP_LEVEL.

Change-Id: Iaecd7306a4b6d9ad494684c201cf12f8e74d684b
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

cmake/QtProcessConfigureArgs.cmake

@@ -6,6 +6,7 @@
 #          with one option per line.
 # MODULE_ROOT: The source directory of the module to be built.
 #              If empty, qtbase/top-level is assumed.
+# TOP_LEVEL: TRUE, if this is a top-level build.
 
 include(${CMAKE_CURRENT_LIST_DIR}/QtFeatureCommon.cmake)
 
@@ -31,7 +32,15 @@ else()
 endif()
 set(configure_filename "configure.cmake")
 set(commandline_filename "qt_cmdline.cmake")
-set(commandline_files "${MODULE_ROOT}/${commandline_filename}")
+if(TOP_LEVEL)
+    get_filename_component(MODULE_ROOT "../.." ABSOLUTE BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
+    file(GLOB commandline_files "${MODULE_ROOT}/*/${commandline_filename}")
+    if(EXISTS "${MODULE_ROOT}/${commandline_filename}")
+        list(PREPEND commandline_files "${MODULE_ROOT}/${commandline_filename}")
+    endif()
+else()
+    set(commandline_files "${MODULE_ROOT}/${commandline_filename}")
+endif()
 file(STRINGS "${OPTFILE}" configure_args)
 list(FILTER configure_args EXCLUDE REGEX "^[ \t]*$")
 list(TRANSFORM configure_args STRIP)
@@ -47,12 +56,6 @@ while(configure_args)
         list(POP_FRONT configure_args generator)
     elseif(arg STREQUAL "-cmake-use-default-generator")
         set(auto_detect_generator FALSE)
-    elseif(arg STREQUAL "-top-level")
-        get_filename_component(MODULE_ROOT "../.." ABSOLUTE BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
-        file(GLOB commandline_files "${MODULE_ROOT}/*/${commandline_filename}")
-        if(EXISTS "${MODULE_ROOT}/${commandline_filename}")
-            list(PREPEND commandline_files "${MODULE_ROOT}/${commandline_filename}")
-        endif()
     elseif(arg STREQUAL "-skip")
         list(POP_FRONT configure_args qtrepo)
         push("-DBUILD_${qtrepo}=OFF")

configure

@@ -559,8 +559,8 @@ while [ "$#" -gt 0 ]; do
         BUILD_WITH_CMAKE=yes
         ;;
     redo)
-        if [ -f config.opt ]; then
+        if [ -f ${outpathPrefix}config.opt ]; then
-            if grep -e ^-cmake <config.opt; then
+            if grep -e ^-cmake <${outpathPrefix}config.opt >/dev/null 2>&1; then
                 BUILD_WITH_CMAKE=yes
             fi
         fi
@@ -917,31 +917,35 @@ else
 fi
 }
 
+checkTopLevelBuild "$@"
 parseCommandline "$@"
 handleHelp
 if [ "$BUILD_WITH_CMAKE" = "yes" ]; then
-    checkTopLevelBuild "$@"
     getOptAndQMakeCmdLines "$@"
     optfilename=config.opt
     if [ -z "$optfile" ]; then   # only write optfile if not currently redoing
         optfilepath=${outpathPrefix}${optfilename}
         if [ -f "$optfilepath" ]; then rm "$optfilepath"; fi
         for arg in "$@"; do
+            if [ "$arg" = "-top-level" ]; then
+               continue
+            fi
             echo $arg >> "$optfilepath"
         done
     fi
 
+    top_level_arg=
     if [ -n "$CFG_TOPLEVEL" ]; then
+        top_level_arg=-DTOP_LEVEL=TRUE
         cd ..
     fi
 
-    cmake "-DOPTFILE=$optfilename" -P "$relpath/cmake/QtProcessConfigureArgs.cmake"
+    cmake "-DOPTFILE=$optfilename" $top_level_arg -P "$relpath/cmake/QtProcessConfigureArgs.cmake"
 else
     findPerl
     findAwk
     findMake
     checkQMakeEnv
-    checkTopLevelBuild "$@"
     getOptAndQMakeCmdLines "$@"
     detectOperatingSystem
     maybeVerifyXcode

configure.bat

@@ -316,4 +316,6 @@ if "%rargs%" == "" (
 
 rem Launch CMake-based configure
 cd "%TOPQTDIR%"
-cmake -DOPTFILE=config.opt -P "%QTSRC%\cmake\QtProcessConfigureArgs.cmake"
+set TOP_LEVEL_ARG=
+if %TOPLEVEL% == true set TOP_LEVEL_ARG=-DTOP_LEVEL=TRUE
+cmake -DOPTFILE=config.opt %TOP_LEVEL_ARG% -P "%QTSRC%\cmake\QtProcessConfigureArgs.cmake"