Use tempfile for cflags to shorten command line

Author: tannewt

ports/zephyr-cp/cptools/cpbuild.py

@@ -1,15 +1,13 @@
 import asyncio
-import inspect
+import atexit
+import hashlib
+import json
 import logging
 import os
 import pathlib
-import shlex
-import time
-import hashlib
-import atexit
-import json
 import re
-import sys
+import tempfile
+import time
 
 logger = logging.getLogger(__name__)
 
@@ -327,6 +325,11 @@ def __init__(self, srcdir: pathlib.Path, builddir: pathlib.Path, cmake_args):
         self.ar = cmake_args["AR"]
         self.cflags = cmake_args.get("CFLAGS", "")
 
+        self._cflags_tempfile = tempfile.NamedTemporaryFile()
+        self._cflags_tempfile.write(self.cflags.encode())
+        self._cflags_tempfile.flush()
+        self.cflags_file = "@" + self._cflags_tempfile.name
+
         self.srcdir = srcdir
         self.builddir = builddir
 
@@ -346,7 +349,7 @@ async def preprocess(
                 depfile,
                 "-c",
                 source_file,
-                self.cflags,
+                self.cflags_file,
                 *flags,
                 "-o",
                 output_file,
@@ -376,7 +379,16 @@ async def compile(
                 else:
                     extradeps.append(self.srcdir / dep)
         await run_command(
-            [self.c_compiler, self.cflags, "-MMD", "-c", source_file, *flags, "-o", output_file],
+            [
+                self.c_compiler,
+                self.cflags_file,
+                "-MMD",
+                "-c",
+                source_file,
+                *flags,
+                "-o",
+                output_file,
+            ],
             description=f"Compile {source_file.relative_to(self.srcdir)} -> {output_file.relative_to(self.builddir)}",
             working_directory=self.srcdir,
             extradeps=extradeps,