pylibfdt: Fix "invalid escape sequence '\w'" in setup.py

Once u-boot's build system invokes

python3 scripts/dtc/pylibfdt/setup.py --quiet build_ext --inplace

it may fail with

scripts/dtc/pylibfdt/setup.py:40: SyntaxWarning: invalid escape sequence '\w'
  RE_KEY_VALUE = re.compile('(?P<key>\w+) *(?P<plus>[+])?= *(?P<value>.*)$')

depending on the used Python version.

Explicitly mark the regex string as raw string to avoid the warning.

Signed-off-by: Florian Schmaus <flo@geekplace.eu>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
[sw0312.kim: cherry-pick upstream commit d4c84d7062ec to resolve script warning]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I5b53521afea61a07fa36725cb9ceedb4545ee188

diff --git a/scripts/dtc/pylibfdt/setup.py b/scripts/dtc/pylibfdt/setup.py
index 8baae08770cad8972afc0e36c81729dc83809484..c6fe5a6a446f32bbbeb8af8f838f525ee90db3d6 100755 (executable)
--- a/scripts/dtc/pylibfdt/setup.py
+++ b/scripts/dtc/pylibfdt/setup.py
@@ -37,7 +37,7 @@ with open(os.path.join(srcdir, "../README"), "r") as fh:
     long_description = fh.read()
 
 # Decodes a Makefile assignment line into key and value (and plus for +=)
-RE_KEY_VALUE = re.compile('(?P<key>\w+) *(?P<plus>[+])?= *(?P<value>.*)$')
+RE_KEY_VALUE = re.compile(r'(?P<key>\w+) *(?P<plus>[+])?= *(?P<value>.*)$')
 
 def get_top_builddir():
     if '--top-builddir' in sys.argv: