doc: Fix gen-manpages to check build options

contrib/devtools/gen-manpages.py

@@ -6,6 +6,7 @@
 import subprocess
 import sys
 import tempfile
+import configparser
 
 BINARIES = [
 'src/bitcoind',
@@ -57,6 +58,30 @@
     print('To properly generate man pages, please commit your changes (or discard them), rebuild, then run this script again.')
     print()
 
+# Check enabled build options
+config = configparser.ConfigParser()
+conffile = os.path.join(builddir, 'test/config.ini')
+config.read(conffile)
+
+error_message = "Aborting generating manpages…\nError: {component} support is not enabled.\nPlease enable it and try again."
+
+if not config['components'].getboolean('HAVE_SYSTEM'):
+    print(error_message.format(component="System components"))
+    sys.exit(1)
+
+if not config['components'].getboolean('ENABLE_WALLET'):
+    print(error_message.format(component="Wallet functionality"))
+    sys.exit(1)
+
+if not config['components'].getboolean('USE_UPNP'):
+    print(error_message.format(component="UPnP"))
+    sys.exit(1)
+
+if not config['components'].getboolean('ENABLE_ZMQ'):
+    print(error_message.format(component="ZMQ"))
+    sys.exit(1)
+
+
 with tempfile.NamedTemporaryFile('w', suffix='.h2m') as footer:
     # Create copyright footer, and write it to a temporary include file.
     # Copyright is the same for all binaries, so just use the first.
@@ -68,4 +93,4 @@
     for (abspath, verstr, _) in versions:
         outname = os.path.join(mandir, os.path.basename(abspath) + '.1')
         print(f'Generating {outname}…')
-        subprocess.run([help2man, '-N', '--version-string=' + verstr, '--include=' + footer.name, '-o', outname, abspath], check=True)
+        subprocess.run([help2man, '-N', '--version-string=' + verstr, '--include=' + footer.name, '-o', outname, abspath], check=True)