traceroute6: Fix most of the warnings at the default WARNS level

[shubh]

Summary

After removing WARNS?=3 from the Makefile, the following warnings came into the picture:

• -Wmissing-variable-declarations The global variables should've been static, since traceroute6 only has one file.

• -Wcast-align Fixing this error would've required creating many local variables on the stack since the error had many instances, hence -Wno-cast-align was added to the Makefile.

• -Wincompatible-pointer-types-discards-qualifiers I created 2 new variables, to fix this problem, namely ipssp_inbypass and ipssp_outbypass

• -Wshadow I gave new names to the variables which were being shadowed to deal with this error

[markj]

Could you please upload diffs with context? If you look at the examples on the wiki page of uploading patch files directly, they specify using -U99999.

[shubh]

Updated diff with context

[markj]

This looks ok to me other than the feedback. Thanks for doing it!

usr.sbin/traceroute6/traceroute6.c

370

I think the comments are not necessary. They also break style(9) since the lines are longer than 80 columns.

You don't need to include the array length in the definition, it should work to write char ipssp_inbypass[] = ....

I don't quite understand what the "ipssp" string means.

These strings should be defined under #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC).

815

Looking at this more closely, it's fine to just reuse the top-level variables.

This makes me realize that the other use of getaddrinfo() above is missing a freeaddrinfo(res) call, so let's add that too.

[shubh]

• Renamed the new variables, and wrapped them in #if defined
• Removed the variable definitions in the source selection code, and reuse the top-level variables
• added a freeaddrinfo(res) which was missing
• Removed unnecessary comments

[markj]

Thanks! I made one other comment, please fix and I'll do some testing and commit.

usr.sbin/traceroute6/traceroute6.c

370

The "#if" should not be indented; see the other places where #ifdef etc. are used.

While here, could you convert other instances of

#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
...

to

#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)

as you did here?

[shubh]

Fixed indents and changed all instances of

#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC

to

#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)

[markj]

usr.sbin/traceroute6/traceroute6.c

306

You also need to remove one of the #endifs. Please make sure to at least test the build before uploading to phabricator in the future.