Add -Wmissing-variable-declarations, with attendant fixes

This is a big-ish patch, but it's very straightforward.  Under this
clang warning, we're not actually allowed to have a global variable
without a previous extern declaration for it.  The cases where we
violated this rule fall into three roughly equal groups:
  * Stuff that should have been static.
  * Stuff that was global but where the extern was local to some
    other C file.
  * Stuff that was only global when built for the unit tests, that
    needed a conditional extern in the headers.

The first two were IMO genuine problems; the last is a wart of how
we build tests.

1 files changed, 15 insertions, 15 deletions

diff --git a/src/tools/tor-gencert.c b/src/tools/tor-gencert.c
index c05066722a..7781966024 100644
--- a/src/tools/tor-gencert.c
+++ b/src/tools/tor-gencert.c
@@ -39,21 +39,21 @@
 #define DEFAULT_LIFETIME 12
 
 /* These globals are set via command line options. */
-char *identity_key_file = NULL;
-char *signing_key_file = NULL;
-char *certificate_file = NULL;
-int reuse_signing_key = 0;
-int verbose = 0;
-int make_new_id = 0;
-int months_lifetime = DEFAULT_LIFETIME;
-int passphrase_fd = -1;
-char *address = NULL;
-
-char *passphrase = NULL;
-size_t passphrase_len = 0;
-
-EVP_PKEY *identity_key = NULL;
-EVP_PKEY *signing_key = NULL;
+static char *identity_key_file = NULL;
+static char *signing_key_file = NULL;
+static char *certificate_file = NULL;
+static int reuse_signing_key = 0;
+static int verbose = 0;
+static int make_new_id = 0;
+static int months_lifetime = DEFAULT_LIFETIME;
+static int passphrase_fd = -1;
+static char *address = NULL;
+
+static char *passphrase = NULL;
+static size_t passphrase_len = 0;
+
+static EVP_PKEY *identity_key = NULL;
+static EVP_PKEY *signing_key = NULL;
 
 /** Write a usage message for tor-gencert to stderr. */
 static void