tools/gcc-plugins: add small test for frr-format

Just enough to check that it works.

Signed-off-by: David Lamparter <equinox@diac24.net>

1 files changed, 57 insertions, 0 deletions

diff --git a/tools/gcc-plugins/format-test.py b/tools/gcc-plugins/format-test.py
new file mode 100644
index 0000000000..cc6ca6100e
--- /dev/null
+++ b/tools/gcc-plugins/format-test.py
@@ -0,0 +1,57 @@
+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)
+
+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('gcc -Wall -Wextra -Wno-unused -fplugin=./frr-format.so -fno-diagnostics-show-caret -c -o format-test.o format-test.c')
+
+gcc = subprocess.Popen(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])))