diff --git a/agent/call-pinentry.c b/agent/call-pinentry.c
index 4de897a6b..33e3ec3c6 100644
--- a/agent/call-pinentry.c
+++ b/agent/call-pinentry.c
@@ -717,6 +717,8 @@ setup_qualitybar (ctrl_t ctrl)
   char *tmpstr, *tmpstr2;
   const char *tooltip;
 
+  (void)ctrl;
+
   /* TRANSLATORS: This string is displayed by Pinentry as the label
      for the quality bar.  */
   tmpstr = try_percent_escape (L_("Quality:"), "\t\r\n\f\v");
diff --git a/agent/gpg-agent.c b/agent/gpg-agent.c
index 3a5abbba4..04b03d390 100644
--- a/agent/gpg-agent.c
+++ b/agent/gpg-agent.c
@@ -1178,7 +1178,9 @@ main (int argc, char **argv )
       gnupg_fd_t fd_extra = GNUPG_INVALID_FD;
       gnupg_fd_t fd_browser = GNUPG_INVALID_FD;
       gnupg_fd_t fd_ssh = GNUPG_INVALID_FD;
+#ifndef HAVE_W32_SYSTEM
       pid_t pid;
+#endif
 
       /* Remove the DISPLAY variable so that a pinentry does not
          default to a specific display.  There is still a default
@@ -1237,7 +1239,6 @@ main (int argc, char **argv )
 #ifdef HAVE_W32_SYSTEM
       (void)csh_style;
       (void)nodetach;
-      pid = getpid ();
 #else /*!HAVE_W32_SYSTEM*/
       pid = fork ();
       if (pid == (pid_t)-1)
diff --git a/common/iobuf.c b/common/iobuf.c
index d49de9695..e8b4a034e 100644
--- a/common/iobuf.c
+++ b/common/iobuf.c
@@ -267,6 +267,7 @@ direct_open (const char *fname, const char *mode, int mode700)
   unsigned long da, cd, sm;
   HANDLE hfile;
 
+  (void)mode700;
   /* Note, that we do not handle all mode combinations */
 
   /* According to the ReactOS source it seems that open() of the
@@ -2271,8 +2272,6 @@ iobuf_set_limit (iobuf_t a, off_t nlimit)
 off_t
 iobuf_get_filelength (iobuf_t a, int *overflow)
 {
-  struct stat st;
-
   if (overflow)
     *overflow = 0;
 
@@ -2330,11 +2329,15 @@ iobuf_get_filelength (iobuf_t a, int *overflow)
       }
     log_error ("GetFileSize for handle %p failed: %s\n",
 	       fp, w32_strerror (0));
-#else
-    if ( !fstat (FD2INT (fp), &st) )
-      return st.st_size;
-    log_error("fstat() failed: %s\n", strerror(errno) );
-#endif
+#else /*!HAVE_W32_SYSTEM*/
+    {
+      struct stat st;
+
+      if ( !fstat (FD2INT (fp), &st) )
+        return st.st_size;
+      log_error("fstat() failed: %s\n", strerror(errno) );
+    }
+#endif /*!HAVE_W32_SYSTEM*/
   }
 
   return 0;
diff --git a/common/w32-afunix.h b/common/w32-afunix.h
index f6282a3dd..7025a4914 100644
--- a/common/w32-afunix.h
+++ b/common/w32-afunix.h
@@ -38,7 +38,7 @@
 #include <unistd.h>
 
 /* We can easiliy replace this code by the socket wrappers from libassuan.  */
-#warning Please do not use this module anymore
+#warning Remove this code; it is only used on w32 by symcryptrun.
 
 #define DIRSEP_C '\\'
 
diff --git a/g10/keylist.c b/g10/keylist.c
index 031612cd2..58c0a9699 100644
--- a/g10/keylist.c
+++ b/g10/keylist.c
@@ -870,7 +870,7 @@ list_keyblock_pka (ctrl_t ctrl, kbnode_t keyblock)
   char pkstrbuf[PUBKEY_STRING_SIZE];
   char *hexfpr;
   char *hexkeyblock = NULL;
-  unsigned int hexkeyblocklen;
+  unsigned int hexkeyblocklen = 0;  /* Init to avoid -Wmaybe-uninitialized. */
   const char *s;
 
   /* Get the keyid from the keyblock.  */
diff --git a/g10/trustdb.c b/g10/trustdb.c
index 386796c68..fbb806d85 100644
--- a/g10/trustdb.c
+++ b/g10/trustdb.c
@@ -992,9 +992,16 @@ tdb_get_validity_core (PKT_public_key *pk, PKT_user_id *uid,
   TRUSTREC trec, vrec;
   gpg_error_t err;
   ulong recno;
+#ifdef USE_TOFU
   unsigned int tofu_validity = TRUST_UNKNOWN;
+#endif
   unsigned int validity = TRUST_UNKNOWN;
 
+#ifndef USE_TOFU
+  (void)sig;
+  (void)may_ask;
+#endif
+
   init_trustdb ();
 
   /* If we have no trustdb (which also means it has not been created)