Build scripts: Fix path format for cmake calls

Make sure to pass posix style paths to CMAKE_PREFIX_PATH,
CMAKE_MODULE_PATH and CMAKE_INSTALL_PREFIX. Otherwise this can lead to
funny "Unknown control sequence \U" kind of errors.

Follow-up of fceaff1a6f

Change-Id: I1c8445f9c298a17115bca6b42f099a99e33d6de2
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

scripts/build.py

@@ -112,6 +112,7 @@ def build_qtcreator(args, paths):
         prefix_paths += [paths.llvm]
     if paths.elfutils:
         prefix_paths += [paths.elfutils]
+    prefix_paths = [common.to_posix_path(fp) for fp in prefix_paths]
     build_type = 'Debug' if args.debug else 'Release'
     with_docs_str = 'OFF' if args.no_docs else 'ON'
     build_date_option = 'OFF' if args.no_build_date else 'ON'
@@ -123,7 +124,7 @@ def build_qtcreator(args, paths):
                   '-DWITH_DOCS=' + with_docs_str,
                   '-DBUILD_DEVELOPER_DOCS=' + with_docs_str,
                   '-DBUILD_EXECUTABLE_SDKTOOL=OFF',
-                  '-DCMAKE_INSTALL_PREFIX=' + paths.install,
+                  '-DCMAKE_INSTALL_PREFIX=' + common.to_posix_path(paths.install),
                   '-DWITH_TESTS=' + test_option,
                   '-G', 'Ninja']
 
@@ -131,7 +132,7 @@ def build_qtcreator(args, paths):
         cmake_args += ['-DPYTHON_EXECUTABLE=' + args.python3]
 
     if args.module_paths:
-        module_paths = [os.path.abspath(fp).replace('\\', '/') for fp in args.module_paths]
+        module_paths = [common.to_posix_path(os.path.abspath(fp)) for fp in args.module_paths]
         cmake_args += ['-DCMAKE_MODULE_PATH=' + ';'.join(module_paths)]
 
     # force MSVC on Windows, because it looks for GCC in the PATH first,

scripts/build_plugin.py

@@ -66,11 +66,12 @@ def build(args, paths):
     if not os.path.exists(paths.result):
         os.makedirs(paths.result)
     prefix_paths = [os.path.abspath(fp) for fp in args.prefix_paths] + [paths.qt_creator, paths.qt]
+    prefix_paths = [common.to_posix_path(fp) for fp in prefix_paths]
     build_type = 'Debug' if args.debug else 'Release'
     cmake_args = ['cmake',
                   '-DCMAKE_PREFIX_PATH=' + ';'.join(prefix_paths),
                   '-DCMAKE_BUILD_TYPE=' + build_type,
-                  '-DCMAKE_INSTALL_PREFIX=' + paths.install,
+                  '-DCMAKE_INSTALL_PREFIX=' + common.to_posix_path(paths.install),
                   '-G', 'Ninja']
 
     # force MSVC on Windows, because it looks for GCC in the PATH first,

scripts/common.py

@@ -40,6 +40,12 @@ def is_linux_platform():
 def is_mac_platform():
     return sys.platform.startswith('darwin')
 
+def to_posix_path(path):
+    if is_windows_platform():
+        # should switch to pathlib from python3
+        return path.replace('\\', '/')
+    return path
+
 def check_print_call(command, workdir, env=None):
     print('------------------------------------------')
     print('COMMAND:')