MAINT: Fixup hardcoded build folder

meson.build

@@ -510,7 +510,8 @@ _read_config_py = './read_config.py'
 
 run_command(py3,
             _read_config_py,
-            _config_h,
+            '--file1', _config_h,
+            '--build_dir', meson.current_build_dir(),
             check: true)
 
 keyval = import('keyval')

read_config.py

@@ -1,10 +1,12 @@
 #!/usr/bin/env python3
 
 import argparse
+from pathlib import Path
 
-def read_config_file(file_path: str) -> dict:
+
+def read_config_file(file_path: Path) -> dict:
     config_data = {}
-    with open(file_path, "r") as file:
+    with file_path.open("r") as file:
         lines = file.readlines()
         for line in lines:
             line = line.strip()
@@ -22,18 +24,26 @@ def read_config_file(file_path: str) -> dict:
                     config_data[key] = 1
     return config_data
 
+
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description="Read a config.h file.")
-    parser.add_argument("file1", help="Path to the config.h file.")
+    parser = argparse.ArgumentParser(
+        description="Read a config.h file and write to a specified build directory."
+    )
+    parser.add_argument("--file1", type=Path, help="Path to the config.h file.")
+    parser.add_argument("--build_dir", type=Path, help="Path to the build directory.")
 
     args = parser.parse_args()
 
     config_data = read_config_file(args.file1)
     fdat = []
     for key, value in config_data.items():
-        fdat.append(f'{key}={value}')
-    result = '\n'.join(fdat)
+        fdat.append(f"{key}={value}")
+    result = "\n".join(fdat)
 
-    f = open("./build/config.kconf", "a")
-    f.write(result)
-    f.close()
+    # Ensure the build directory exists
+    args.build_dir.mkdir(parents=True, exist_ok=True)
+
+    # Write to the specified file in the build directory
+    output_file_path = args.build_dir / "config.kconf"
+    with output_file_path.open("a") as f:
+        f.write(result)