fix: Always explicitly set encoding for text files (fixes #8263)

3 files changed, 11 insertions, 9 deletions

diff --git a/mesonbuild/backend/backends.py b/mesonbuild/backend/backends.py
index c489dce..21a6c83 100644
--- a/mesonbuild/backend/backends.py
+++ b/mesonbuild/backend/backends.py
@@ -374,7 +374,7 @@ class Backend:
             if not os.path.exists(outfileabs_tmp_dir):
                 os.makedirs(outfileabs_tmp_dir)
             result.append(unity_src)
-            return open(outfileabs_tmp, 'w')
+            return open(outfileabs_tmp, 'w', encoding='utf-8')
 
         # For each language, generate unity source files and return the list
         for comp, srcs in compsrcs.items():
@@ -765,7 +765,7 @@ class Backend:
 
         content = f'#include "{os.path.basename(pch_header)}"'
         pch_file_tmp = pch_file + '.tmp'
-        with open(pch_file_tmp, 'w') as f:
+        with open(pch_file_tmp, 'w', encoding='utf-8') as f:
             f.write(content)
         mesonlib.replace_if_different(pch_file, pch_file_tmp)
         return pch_rel_to_build
@@ -1019,7 +1019,7 @@ class Backend:
         ifilename = os.path.join(self.environment.get_build_dir(), 'depmf.json')
         ofilename = os.path.join(self.environment.get_prefix(), self.build.dep_manifest_name)
         mfobj = {'type': 'dependency manifest', 'version': '1.0', 'projects': self.build.dep_manifest}
-        with open(ifilename, 'w') as f:
+        with open(ifilename, 'w', encoding='utf-8') as f:
             f.write(json.dumps(mfobj))
         # Copy file from, to, and with mode unchanged
         d.data.append(InstallDataBase(ifilename, ofilename, None, ''))
diff --git a/mesonbuild/backend/ninjabackend.py b/mesonbuild/backend/ninjabackend.py
index 192cef3..597789b 100644
--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -20,6 +20,7 @@ import subprocess
 from collections import OrderedDict
 from enum import Enum, unique
 import itertools
+from textwrap import dedent
 from pathlib import PurePath, Path
 from functools import lru_cache
 
@@ -462,10 +463,11 @@ class NinjaBackend(backends.Backend):
             return open(tempfilename, 'a', encoding='utf-8')
         filename = os.path.join(self.environment.get_scratch_dir(),
                                 'incdetect.c')
-        with open(filename, 'w') as f:
-            f.write('''#include<stdio.h>
-int dummy;
-''')
+        with open(filename, 'w', encoding='utf-8') as f:
+            f.write(dedent('''\
+                #include<stdio.h>
+                int dummy;
+            '''))
 
         # The output of cl dependency information is language
         # and locale dependent. Any attempt at converting it to
@@ -1215,7 +1217,7 @@ int dummy;
         manifest_path = os.path.join(self.get_target_private_dir(target), 'META-INF', 'MANIFEST.MF')
         manifest_fullpath = os.path.join(self.environment.get_build_dir(), manifest_path)
         os.makedirs(os.path.dirname(manifest_fullpath), exist_ok=True)
-        with open(manifest_fullpath, 'w') as manifest:
+        with open(manifest_fullpath, 'w', encoding='utf-8') as manifest:
             if any(target.link_targets):
                 manifest.write('Class-Path: ')
                 cp_paths = [os.path.join(self.get_target_dir(l), l.get_filename()) for l in target.link_targets]
diff --git a/mesonbuild/backend/vs2010backend.py b/mesonbuild/backend/vs2010backend.py
index 5595fd0..7fcc324 100644
--- a/mesonbuild/backend/vs2010backend.py
+++ b/mesonbuild/backend/vs2010backend.py
@@ -206,7 +206,7 @@ class Vs2010Backend(backends.Backend):
 
     @staticmethod
     def touch_regen_timestamp(build_dir: str) -> None:
-        with open(Vs2010Backend.get_regen_stampfile(build_dir), 'w'):
+        with open(Vs2010Backend.get_regen_stampfile(build_dir), 'w', encoding='utf-8'):
             pass
 
     def get_vcvars_command(self):