gh-112301: Add argument aliases and tee compiler output for check warnings (GH-122465)

Also remove superfluous shebang from the warning check script

Author: nohlson

.github/workflows/reusable-ubuntu.yml

@@ -75,7 +75,7 @@ jobs:
         ${{ fromJSON(inputs.free-threading) && '--disable-gil' || '' }}
     - name: Build CPython out-of-tree
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
-      run: make -j4 &> compiler_output.txt
+      run: set -o pipefail; make -j4 2>&1 | tee compiler_output.txt
     - name: Display build info
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: make pythoninfo

Tools/build/check_warnings.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 """
 Parses compiler output with -fdiagnostics-format=json and checks that warnings
 exist only in files that are expected to have warnings.
@@ -114,24 +113,28 @@ def get_unexpected_improvements(
 def main(argv: list[str] | None = None) -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument(
+        "-c",
         "--compiler-output-file-path",
         type=str,
         required=True,
         help="Path to the compiler output file",
     )
     parser.add_argument(
+        "-i",
         "--warning-ignore-file-path",
         type=str,
         required=True,
         help="Path to the warning ignore file",
     )
     parser.add_argument(
+        "-x",
         "--fail-on-regression",
         action="store_true",
         default=False,
         help="Flag to fail if new warnings are found",
     )
     parser.add_argument(
+        "-X",
         "--fail-on-improvement",
         action="store_true",
         default=False,