Use the CMake path format when passing the CMAKE_PREFIX_PATH to ctest

The generated 'CTestTestfile.cmake' file contains unescaped '\' symbols
in --build-options argument that causes an issue if the Windows path
format is used in CMAKE_PREFIX_PATH.

Change-Id: Ic03934fcb7bc6230cef72584fef81b01026d5f3b
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

src/corelib/Qt6CTestMacros.cmake

@@ -17,7 +17,11 @@ foreach(_mod ${CMAKE_MODULES_UNDER_TEST})
     message("CMAKE_${_mod}_MODULE_PATCH_VERSION: ${CMAKE_${_mod}_MODULE_PATCH_VERSION}")
 endforeach()
 
+# The function collects configuring options for the test projects generated by Qt cmake tests.
+# Arguments:
+#   OUT_PREFIX_PATH <variable name>: stores the CMAKE_PREFIX_PATH value in the output variable.
 function(_qt_internal_get_cmake_test_configure_options out_var)
+    cmake_parse_arguments(arg "" "OUT_PREFIX_PATH" "" ${ARGN})
     set(option_list)
 
     if (CMAKE_C_COMPILER AND NOT CMAKE_CROSSCOMPILING)
@@ -78,6 +82,18 @@ function(_qt_internal_get_cmake_test_configure_options out_var)
         )
     endforeach()
 
+    set(prefixes "")
+    foreach(prefix_path IN LISTS CMAKE_PREFIX_PATH)
+      file(TO_CMAKE_PATH "${prefix_path}" prefix_path)
+      list(APPEND prefixes "${prefix_path}")
+    endforeach()
+    if(arg_OUT_PREFIX_PATH)
+      set(${arg_OUT_PREFIX_PATH} "${prefixes}" PARENT_SCOPE)
+    endif()
+
+    string(REPLACE ";" "\;" prefixes "${prefixes}")
+    list(APPEND option_list "-DCMAKE_PREFIX_PATH=${prefixes}")
+
     set(${out_var} "${option_list}" PARENT_SCOPE)
 endfunction()
 
@@ -294,9 +310,6 @@ macro(_qt_internal_test_expect_pass _dir)
         endif()
     endif()
 
-    set(__expect_pass_prefixes "${CMAKE_PREFIX_PATH}")
-    string(REPLACE ";" "\;" __expect_pass_prefixes "${__expect_pass_prefixes}")
-
     set(__expect_pass_build_dir "${CMAKE_CURRENT_BINARY_DIR}/${_dir}")
     if(_ARGS_BUILD_DIR)
         set(__expect_pass_build_dir "${CMAKE_CURRENT_BINARY_DIR}/${_ARGS_BUILD_DIR}")
@@ -341,7 +354,7 @@ macro(_qt_internal_test_expect_pass _dir)
         --build-generator "${generator}"
         --build-makeprogram "${make_program}"
         ${build_project}
-        --build-options "-DCMAKE_PREFIX_PATH=${__expect_pass_prefixes}" ${option_list}
+        --build-options "${option_list}"
                         ${_ARGS_BUILD_OPTIONS} ${additional_configure_args}
         ${test_command}
     )
@@ -357,7 +370,6 @@ macro(_qt_internal_test_expect_pass _dir)
 
     unset(__expect_pass_source_dir)
     unset(__expect_pass_build_dir)
-    unset(__expect_pass_prefixes)
 endmacro()
 
 # Checks if the build of the test project fails.
@@ -378,9 +390,12 @@ macro(_qt_internal_test_expect_build_fail _dir)
   file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/failbuild/${_dir}")
   file(COPY "${CMAKE_CURRENT_SOURCE_DIR}/${_dir}" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}/failbuild/${_dir}")
 
+  set(__expect_fail_prefixes "")
+  _qt_internal_get_cmake_test_configure_options(option_list OUT_PREFIX_PATH __expect_fail_prefixes)
+
   file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/failbuild/${_dir}/${_dir}/FindPackageHints.cmake"
-      "set(Qt6Tests_PREFIX_PATH \"${CMAKE_PREFIX_PATH}\")
-list(APPEND CMAKE_PREFIX_PATH \"${CMAKE_PREFIX_PATH}\")
+      "set(Qt6Tests_PREFIX_PATH \"${__expect_fail_prefixes}\")
+list(APPEND CMAKE_PREFIX_PATH \"${__expect_fail_prefixes}\")
 ")
 
   file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/failbuild/${_dir}/CMakeLists.txt"
@@ -400,7 +415,6 @@ list(APPEND CMAKE_PREFIX_PATH \"${CMAKE_PREFIX_PATH}\")
       "
   )
 
-  _qt_internal_get_cmake_test_configure_options(option_list)
   add_test(${testname} ${CMAKE_CTEST_COMMAND}
     --build-and-test
     "${CMAKE_CURRENT_BINARY_DIR}/failbuild/${_dir}"
@@ -409,8 +423,9 @@ list(APPEND CMAKE_PREFIX_PATH \"${CMAKE_PREFIX_PATH}\")
     --build-generator "${CMAKE_GENERATOR}"
     --build-makeprogram "${CMAKE_MAKE_PROGRAM}"
     --build-project "${_dir}"
-    --build-options "-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}" ${option_list}
+    --build-options ${option_list}
   )
+  unset(__expect_fail_prefixes)
 endmacro()
 
 function(_qt_internal_test_module_includes)
@@ -512,6 +527,6 @@ function(_qt_internal_test_module_includes)
     --build-generator "${CMAKE_GENERATOR}"
     --build-makeprogram "${CMAKE_MAKE_PROGRAM}"
     --build-project module_includes
-    --build-options "-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}" ${option_list}
+    --build-options ${option_list}
   )
 endfunction()