1 files changed, 74 insertions, 0 deletions
diff --git a/tools/gcc-plugins/format-test.py b/tools/gcc-plugins/format-test.py
new file mode 100644
index 0000000..ddf71aa
--- /dev/null
+++ b/tools/gcc-plugins/format-test.py
@@ -0,0 +1,74 @@
+import subprocess
+import sys
+import shlex
+import os
+import re
+
+os.environ["LC_ALL"] = "C"
+os.environ["LANG"] = "C"
+for k in list(os.environ.keys()):
+    if k.startswith("LC_"):
+        os.environ.pop(k)
+
+if len(sys.argv) < 2:
+    sys.stderr.write("start as format-test.py gcc-123.45 [-options ...]\n")
+    sys.exit(1)
+
+c_re = re.compile(r"//\s+(NO)?WARN")
+expect = {}
+lines = {}
+
+with open("format-test.c", "r") as fd:
+    for lno, line in enumerate(fd.readlines(), 1):
+        lines[lno] = line.strip()
+        m = c_re.search(line)
+        if m is None:
+            continue
+        if m.group(1) is None:
+            expect[lno] = "warn"
+        else:
+            expect[lno] = "nowarn"
+
+cmd = shlex.split(
+    "-Wall -Wextra -Wno-unused -fplugin=./frr-format.so -fno-diagnostics-show-caret -c -o format-test.o format-test.c"
+)
+
+gcc = subprocess.Popen(
+    sys.argv[1:] + cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+)
+sout, serr = gcc.communicate()
+gcc.wait()
+
+gcclines = serr.decode("UTF-8").splitlines()
+line_re = re.compile(r"^format-test\.c:(\d+):(.*)$")
+gcc_warns = {}
+
+for line in gcclines:
+    if line.find("In function") >= 0:
+        continue
+    m = line_re.match(line)
+    if m is None:
+        sys.stderr.write("cannot process GCC output: %s\n" % line)
+        continue
+
+    lno = int(m.group(1))
+    gcc_warns.setdefault(lno, []).append(line)
+
+for lno, val in expect.items():
+    if val == "nowarn" and lno in gcc_warns:
+        sys.stderr.write(
+            "unexpected gcc warning on line %d:\n\t%s\n\t%s\n"
+            % (lno, lines[lno], "\n\t".join(gcc_warns[lno]))
+        )
+    if val == "warn" and lno not in gcc_warns:
+        sys.stderr.write(
+            "expected warning on line %d but did not get one\n\t%s\n"
+            % (lno, lines[lno])
+        )
+
+leftover = set(gcc_warns.keys()) - set(expect.keys())
+for lno in sorted(leftover):
+    sys.stderr.write(
+        "unmarked gcc warning on line %d:\n\t%s\n\t%s\n"
+        % (lno, lines[lno], "\n\t".join(gcc_warns[lno]))
+    )