gh-112301: Enable warning emitting options and ignore warnings in CI (#123020)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

.github/workflows/reusable-macos.yml

@@ -35,7 +35,7 @@ jobs:
         path: config.cache
         key: ${{ github.job }}-${{ inputs.os }}-${{ env.IMAGE_VERSION }}-${{ inputs.config_hash }}
     - name: Install Homebrew dependencies
-      run: brew install pkg-config openssl@3.0 xz gdbm tcl-tk
+      run: brew install pkg-config openssl@3.0 xz gdbm tcl-tk make
     - name: Configure CPython
       run: |
         GDBM_CFLAGS="-I$(brew --prefix gdbm)/include" \
@@ -48,10 +48,22 @@ jobs:
           --prefix=/opt/python-dev \
           --with-openssl="$(brew --prefix openssl@3.0)"
     - name: Build CPython
-      run: set -o pipefail; make -j8 2>&1 | tee compiler_output.txt
+      if : ${{ inputs.free-threading || inputs.os != 'macos-13' }}
+      run: gmake -j8
+    - name: Build CPython for compiler warning check
+      if : ${{ !inputs.free-threading && inputs.os == 'macos-13' }}
+      run: set -o pipefail; gmake -j8 --output-sync 2>&1 | tee compiler_output_macos.txt
     - name: Display build info
       run: make pythoninfo
     - name: Check compiler warnings
-      run: python3 Tools/build/check_warnings.py --compiler-output-file-path=compiler_output.txt --warning-ignore-file-path=Tools/build/.warningignore_macos --compiler-output-type=clang
+      if : ${{ !inputs.free-threading && inputs.os == 'macos-13' }}
+      run: >-
+        python3 Tools/build/check_warnings.py
+        --compiler-output-file-path=compiler_output_macos.txt
+        --warning-ignore-file-path=Tools/build/.warningignore_macos
+        --compiler-output-type=clang
+        --fail-on-regression
+        --fail-on-improvement
+        --path-prefix="./"
     - name: Tests
       run: make test

.github/workflows/reusable-ubuntu.yml

@@ -67,20 +67,32 @@ jobs:
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: >-
         ../cpython-ro-srcdir/configure
-        CFLAGS="-fdiagnostics-format=json"
         --config-cache
         --with-pydebug
         --enable-slower-safety
         --with-openssl=$OPENSSL_DIR
         ${{ fromJSON(inputs.free-threading) && '--disable-gil' || '' }}
     - name: Build CPython out-of-tree
+      if: ${{ inputs.free-threading }}
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
-      run: set -o pipefail; make -j4 2>&1 | tee compiler_output.txt
+      run: make -j4
+    - name: Build CPython out-of-tree (for compiler warning check)
+      if: ${{ !inputs.free-threading}}
+      working-directory: ${{ env.CPYTHON_BUILDDIR }}
+      run: set -o pipefail; make -j4 2>&1 | tee compiler_output_ubuntu.txt
     - name: Display build info
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: make pythoninfo
     - name: Check compiler warnings
-      run: python Tools/build/check_warnings.py --compiler-output-file-path=${{ env.CPYTHON_BUILDDIR }}/compiler_output.txt --warning-ignore-file-path ${GITHUB_WORKSPACE}/Tools/build/.warningignore_ubuntu --compiler-output-type=json
+      if: ${{ !inputs.free-threading }}
+      run: >-
+        python Tools/build/check_warnings.py
+        --compiler-output-file-path=${{ env.CPYTHON_BUILDDIR }}/compiler_output_ubuntu.txt
+        --warning-ignore-file-path ${GITHUB_WORKSPACE}/Tools/build/.warningignore_ubuntu
+        --compiler-output-type=gcc
+        --fail-on-regression
+        --fail-on-improvement
+        --path-prefix="../cpython-ro-srcdir/"
     - name: Remount sources writable for tests
       # some tests write to srcdir, lack of pyc files slows down testing
       run: sudo mount $CPYTHON_RO_SRCDIR -oremount,rw

Misc/NEWS.d/next/Security/2024-08-14-19-43-57.gh-issue-112301.IQUcOy.rst

@@ -0,0 +1 @@
+Enable compiler options that warn of potential security vulnerabilities.

Tools/build/.warningignore_macos

@@ -3,3 +3,230 @@
 # Keep lines sorted lexicographically to help avoid merge conflicts.
 # Format example:
 # /path/to/file (number of warnings in file)
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+Include/internal/pycore_backoff.h 1
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+Modules/_ctypes/_ctypes_test_generated.c.h 141
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+Modules/_ctypes/callproc.c 15
+Modules/_ctypes/cfield.c 59
+Modules/_ctypes/malloc_closure.c 3
+Modules/_ctypes/stgdict.c 17
+Modules/_cursesmodule.c 24
+Modules/_datetimemodule.c 28
+Modules/_dbmmodule.c 8
+Modules/_decimal/_decimal.c 15
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+Modules/_functoolsmodule.c 6
+Modules/_gdbmmodule.c 5
+Modules/_hacl/Hacl_Hash_Blake2b_Simd256.c 84
+Modules/_hacl/Hacl_Hash_Blake2s_Simd128.c 84
+Modules/_hacl/include/krml/FStar_UInt_8_16_32_64.h 24
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+Modules/_io/stringio.c 8
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+Python/tracemalloc.c 6

Tools/build/.warningignore_ubuntu

@@ -3,3 +3,263 @@
 # Keep lines sorted lexicographically to help avoid merge conflicts.
 # Format example:
 # /path/to/file (number of warnings in file)
+/home/runner/work/cpython/cpython/multissl/openssl/3.0.15/include/openssl/evp.h 2
+/home/runner/work/cpython/cpython/multissl/openssl/3.0.15/include/openssl/ssl.h 4
+/usr/include/tcl8.6/tclTomMathDecls.h 1
+Include/cpython/bytearrayobject.h 1
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+Include/internal/mimalloc/mimalloc/internal.h 4
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+Include/pymath.h 1
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+Include/pyport.h 2
+Modules/_asynciomodule.c 3
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Tools/build/check_warnings.py

@@ -1,38 +1,49 @@
 """
-Parses compiler output with -fdiagnostics-format=json and checks that warnings
+Parses compiler output from Clang or GCC and checks that warnings
 exist only in files that are expected to have warnings.
 """
 
 import argparse
 from collections import defaultdict
-import json
 import re
 import sys
 from pathlib import Path
 from typing import NamedTuple
 
+
 class FileWarnings(NamedTuple):
     name: str
     count: int
 
 
-def extract_warnings_from_compiler_output_clang(
+def extract_warnings_from_compiler_output(
     compiler_output: str,
+    compiler_output_type: str,
+    path_prefix: str = "",
 ) -> list[dict]:
     """
-    Extracts warnings from the compiler output when using clang
+    Extracts warnings from the compiler output based on compiler
+    output type. Removes path prefix from file paths if provided.
+    Compatible with GCC and Clang compiler output.
     """
-    # Regex to find warnings in the compiler output
+    # Choose pattern and compile regex for particular compiler output
-    clang_warning_regex = re.compile(
+    if compiler_output_type == "gcc":
-        r"(?P<file>.*):(?P<line>\d+):(?P<column>\d+): warning: "
+        regex_pattern = (
-        r"(?P<message>.*) (?P<option>\[-[^\]]+\])$"
+            r"(?P<file>.*):(?P<line>\d+):(?P<column>\d+): warning: "
-    )
+            r"(?P<message>.*?)(?: (?P<option>\[-[^\]]+\]))?$"
+        )
+    elif compiler_output_type == "clang":
+        regex_pattern = (
+            r"(?P<file>.*):(?P<line>\d+):(?P<column>\d+): warning: "
+            r"(?P<message>.*) (?P<option>\[-[^\]]+\])$"
+        )
+    compiled_regex = re.compile(regex_pattern)
     compiler_warnings = []
     for line in compiler_output.splitlines():
-        if match := clang_warning_regex.match(line):
+        if match := compiled_regex.match(line):
             compiler_warnings.append(
                 {
-                    "file": match.group("file"),
+                    "file": match.group("file").removeprefix(path_prefix),
                     "line": match.group("line"),
                     "column": match.group("column"),
                     "message": match.group("message"),
@@ -43,63 +54,11 @@ def extract_warnings_from_compiler_output_clang(
     return compiler_warnings
 
 
-def extract_warnings_from_compiler_output_json(
-    compiler_output: str,
-) -> list[dict]:
-    """
-    Extracts warnings from the compiler output when using
-    -fdiagnostics-format=json.
-
-    Compiler output as a whole is not a valid json document,
-    but includes many json objects and may include other output
-    that is not json.
-    """
-    # Regex to find json arrays at the top level of the file
-    # in the compiler output
-    json_arrays = re.findall(r"\[(?:[^[\]]|\[[^]]*])*]", compiler_output)
-    compiler_warnings = []
-    for array in json_arrays:
-        try:
-            json_data = json.loads(array)
-            json_objects_in_array = [entry for entry in json_data]
-            warning_list = [
-                entry
-                for entry in json_objects_in_array
-                if entry.get("kind") == "warning"
-            ]
-            for warning in warning_list:
-                locations = warning["locations"]
-                for location in locations:
-                    for key in ["caret", "start", "end"]:
-                        if key in location:
-                            compiler_warnings.append(
-                                {
-                                    # Remove leading current directory if present
-                                    "file": location[key]["file"].lstrip("./"),
-                                    "line": location[key]["line"],
-                                    "column": location[key]["column"],
-                                    "message": warning["message"],
-                                    "option": warning["option"],
-                                }
-                            )
-                            # Found a caret, start, or end in location so
-                            # break out completely to address next warning
-                            break
-                    else:
-                        continue
-                    break
-
-        except json.JSONDecodeError:
-            continue  # Skip malformed JSON
-
-    return compiler_warnings
-
-
 def get_warnings_by_file(warnings: list[dict]) -> dict[str, list[dict]]:
     """
-    Returns a dictionary where the key is the file and the data is the warnings
+    Returns a dictionary where the key is the file and the data is the
-    in that file. Does not include duplicate warnings for a file from list of
+    warnings in that file. Does not include duplicate warnings for a
-    provided warnings.
+    file from list of provided warnings.
     """
     warnings_by_file = defaultdict(list)
     warnings_added = set()
@@ -124,22 +83,28 @@ def get_unexpected_warnings(
     are associated with a file that is not found in the list of files
     with expected warnings
     """
-    unexpected_warnings = []
+    unexpected_warnings = {}
     for file in files_with_warnings.keys():
         found_file_in_ignore_list = False
         for ignore_file in files_with_expected_warnings:
             if file == ignore_file.name:
                 if len(files_with_warnings[file]) > ignore_file.count:
-                    unexpected_warnings.extend(files_with_warnings[file])
+                    unexpected_warnings[file] = (files_with_warnings[file], ignore_file.count)
                 found_file_in_ignore_list = True
                 break
         if not found_file_in_ignore_list:
-            unexpected_warnings.extend(files_with_warnings[file])
+            unexpected_warnings[file] = (files_with_warnings[file], 0)
 
     if unexpected_warnings:
         print("Unexpected warnings:")
-        for warning in unexpected_warnings:
+        for file in unexpected_warnings:
-            print(warning)
+            print(
+                f"{file} expected {unexpected_warnings[file][1]} warnings,"
+                f" found {len(unexpected_warnings[file][0])}"
+            )
+            for warning in unexpected_warnings[file][0]:
+                print(warning)
+
         return 1
 
     return 0
@@ -156,14 +121,14 @@ def get_unexpected_improvements(
     unexpected_improvements = []
     for file in files_with_expected_warnings:
         if file.name not in files_with_warnings.keys():
-            unexpected_improvements.append(file)
+            unexpected_improvements.append((file.name, file.count, 0))
         elif len(files_with_warnings[file.name]) < file.count:
-                unexpected_improvements.append(file)
+            unexpected_improvements.append((file.name, file.count, len(files_with_warnings[file.name])))
 
     if unexpected_improvements:
         print("Unexpected improvements:")
         for file in unexpected_improvements:
-            print(file.name)
+            print(f"{file[0]} expected {file[1]} warnings, found {file[2]}")
         return 1
 
     return 0
@@ -204,8 +169,15 @@ def main(argv: list[str] | None = None) -> int:
         "--compiler-output-type",
         type=str,
         required=True,
-        choices=["json", "clang"],
+        choices=["gcc", "clang"],
-        help="Type of compiler output file (json or clang)",
+        help="Type of compiler output file (GCC or Clang)",
+    )
+    parser.add_argument(
+        "-p",
+        "--path-prefix",
+        type=str,
+        help="Path prefix to remove from the start of file paths"
+        " in compiler output",
     )
 
     args = parser.parse_args(argv)
@@ -241,7 +213,9 @@ def main(argv: list[str] | None = None) -> int:
             # where the first element is the file name and the second element
             # is the number of warnings expected in that file
             files_with_expected_warnings = {
-                FileWarnings(file.strip().split()[0], int(file.strip().split()[1]))
+                FileWarnings(
+                    file.strip().split()[0], int(file.strip().split()[1])
+                )
                 for file in clean_files
                 if file.strip() and not file.startswith("#")
             }
@@ -249,14 +223,11 @@ def main(argv: list[str] | None = None) -> int:
     with Path(args.compiler_output_file_path).open(encoding="UTF-8") as f:
         compiler_output_file_contents = f.read()
 
-    if args.compiler_output_type == "json":
+    warnings = extract_warnings_from_compiler_output(
-        warnings = extract_warnings_from_compiler_output_json(
+        compiler_output_file_contents,
-            compiler_output_file_contents
+        args.compiler_output_type,
-        )
+        args.path_prefix
-    elif args.compiler_output_type == "clang":
+    )
-        warnings = extract_warnings_from_compiler_output_clang(
-            compiler_output_file_contents
-        )
 
     files_with_warnings = get_warnings_by_file(warnings)
 
@@ -272,6 +243,11 @@ def main(argv: list[str] | None = None) -> int:
     if args.fail_on_improvement:
         exit_code |= status
 
+    print(
+        "For information about this tool and its configuration"
+        " visit https://devguide.python.org/development-tools/warnings/"
+        )
+
     return exit_code
 
 

configure

@@ -9767,6 +9767,201 @@ then :
 else $as_nop
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: -Wtrampolines not supported" >&5
 printf "%s\n" "$as_me: WARNING: -Wtrampolines not supported" >&2;}
+fi
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -Wconversion" >&5
+printf %s "checking whether C compiler accepts -Wconversion... " >&6; }
+if test ${ax_cv_check_cflags__Werror__Wconversion+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS -Werror -Wconversion"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ax_cv_check_cflags__Werror__Wconversion=yes
+else $as_nop
+  ax_cv_check_cflags__Werror__Wconversion=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__Wconversion" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__Wconversion" >&6; }
+if test "x$ax_cv_check_cflags__Werror__Wconversion" = xyes
+then :
+  CFLAGS_NODIST="$CFLAGS_NODIST -Wconversion"
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: -Wconversion not supported" >&5
+printf "%s\n" "$as_me: WARNING: -Wconversion not supported" >&2;}
+fi
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -Wimplicit-fallthrough" >&5
+printf %s "checking whether C compiler accepts -Wimplicit-fallthrough... " >&6; }
+if test ${ax_cv_check_cflags__Werror__Wimplicit_fallthrough+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS -Werror -Wimplicit-fallthrough"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ax_cv_check_cflags__Werror__Wimplicit_fallthrough=yes
+else $as_nop
+  ax_cv_check_cflags__Werror__Wimplicit_fallthrough=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__Wimplicit_fallthrough" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__Wimplicit_fallthrough" >&6; }
+if test "x$ax_cv_check_cflags__Werror__Wimplicit_fallthrough" = xyes
+then :
+  CFLAGS_NODIST="$CFLAGS_NODIST -Wimplicit-fallthrough"
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: -Wimplicit-fallthrough not supported" >&5
+printf "%s\n" "$as_me: WARNING: -Wimplicit-fallthrough not supported" >&2;}
+fi
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -Werror=format-security" >&5
+printf %s "checking whether C compiler accepts -Werror=format-security... " >&6; }
+if test ${ax_cv_check_cflags__Werror__Werror_format_security+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS -Werror -Werror=format-security"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ax_cv_check_cflags__Werror__Werror_format_security=yes
+else $as_nop
+  ax_cv_check_cflags__Werror__Werror_format_security=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__Werror_format_security" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__Werror_format_security" >&6; }
+if test "x$ax_cv_check_cflags__Werror__Werror_format_security" = xyes
+then :
+  CFLAGS_NODIST="$CFLAGS_NODIST -Werror=format-security"
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: -Werror=format-security not supported" >&5
+printf "%s\n" "$as_me: WARNING: -Werror=format-security not supported" >&2;}
+fi
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -Wbidi-chars=any" >&5
+printf %s "checking whether C compiler accepts -Wbidi-chars=any... " >&6; }
+if test ${ax_cv_check_cflags__Werror__Wbidi_chars_any+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS -Werror -Wbidi-chars=any"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ax_cv_check_cflags__Werror__Wbidi_chars_any=yes
+else $as_nop
+  ax_cv_check_cflags__Werror__Wbidi_chars_any=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__Wbidi_chars_any" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__Wbidi_chars_any" >&6; }
+if test "x$ax_cv_check_cflags__Werror__Wbidi_chars_any" = xyes
+then :
+  CFLAGS_NODIST="$CFLAGS_NODIST -Wbidi-chars=any"
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: -Wbidi-chars=any not supported" >&5
+printf "%s\n" "$as_me: WARNING: -Wbidi-chars=any not supported" >&2;}
+fi
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -Wall" >&5
+printf %s "checking whether C compiler accepts -Wall... " >&6; }
+if test ${ax_cv_check_cflags__Werror__Wall+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+
+  ax_check_save_flags=$CFLAGS
+  CFLAGS="$CFLAGS -Werror -Wall"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ax_cv_check_cflags__Werror__Wall=yes
+else $as_nop
+  ax_cv_check_cflags__Werror__Wall=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  CFLAGS=$ax_check_save_flags
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__Wall" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__Wall" >&6; }
+if test "x$ax_cv_check_cflags__Werror__Wall" = xyes
+then :
+  CFLAGS_NODIST="$CFLAGS_NODIST -Wall"
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: -Wall not supported" >&5
+printf "%s\n" "$as_me: WARNING: -Wall not supported" >&2;}
 fi
 
 fi

configure.ac

@@ -2510,6 +2510,11 @@ if test "$disable_safety" = "no"
 then
   AX_CHECK_COMPILE_FLAG([-fstack-protector-strong], [CFLAGS_NODIST="$CFLAGS_NODIST -fstack-protector-strong"], [AC_MSG_WARN([-fstack-protector-strong not supported])], [-Werror])
   AX_CHECK_COMPILE_FLAG([-Wtrampolines], [CFLAGS_NODIST="$CFLAGS_NODIST -Wtrampolines"], [AC_MSG_WARN([-Wtrampolines not supported])], [-Werror])
+  AX_CHECK_COMPILE_FLAG([-Wconversion], [CFLAGS_NODIST="$CFLAGS_NODIST -Wconversion"], [AC_MSG_WARN([-Wconversion not supported])], [-Werror])
+  AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough], [CFLAGS_NODIST="$CFLAGS_NODIST -Wimplicit-fallthrough"], [AC_MSG_WARN([-Wimplicit-fallthrough not supported])], [-Werror])
+  AX_CHECK_COMPILE_FLAG([-Werror=format-security], [CFLAGS_NODIST="$CFLAGS_NODIST -Werror=format-security"], [AC_MSG_WARN([-Werror=format-security not supported])], [-Werror])
+  AX_CHECK_COMPILE_FLAG([-Wbidi-chars=any], [CFLAGS_NODIST="$CFLAGS_NODIST -Wbidi-chars=any"], [AC_MSG_WARN([-Wbidi-chars=any not supported])], [-Werror])
+  AX_CHECK_COMPILE_FLAG([-Wall], [CFLAGS_NODIST="$CFLAGS_NODIST -Wall"], [AC_MSG_WARN([-Wall not supported])], [-Werror])
 fi
 
 AC_MSG_CHECKING([for --enable-slower-safety])