[Swan-dev] odd error only on ppc64 on rhel6

[Antony Antony]

Thanks Paul for bringing this up again.

On Thu, Jun 13, 2019 at 01:14:08PM -0400, Paul Wouters wrote:
> On Thu, 13 Jun 2019, D. Hugh Redelmeier wrote:
> 
> > | > | I'd rather see this case fixed properly by adding the missing
> > | > | initializer, so we don't have to have custom flags passed between
> > | > | different Linux distributions.
> > | >
> > | > As I explained last, this is not a bug in Libreswan.  It is
> > | > intentional and correct.  I said this last time.
> > |
> > | Is there a way to rewrite the code not to trigger this issue. The
> > | advantage is that we than don't need to track special gcc option
> > | passing to various builds we do.
> > 
> > I tried to explain twice: I expect (but haven't tested) that this flag can
> > be passed to GCC on every build we do.  Not just old ones.

Hugh,
which flag do you mean? the actual flag seems to be lost? Atleast I can't 
find it. 

There was an earlier discussion
https://lists.libreswan.org/pipermail/swan-dev/2019-May/003226.html
As re-collect you wrote "-Wno-missing-field-initializers" is not a good 
idea?

It is in docker-targets.mk, which is used by travis testing make scripts.
I think, I added it to compile on CentOS6 and I didn't really understand 
what I am doing:) However, CentOS is broken [1]

NOTE:
We have travis that compile #master on various distributions.  If you need 
something tested on various distributions, only 64bit atm 32 bit compiling 
is on my wish list, please send an explicit request with a patch. I can do 
it pretty quickly and show you there result publically on the travis web 
site. I am sure Tuomo can also do it if you make it easy for the testers:)

The scripts and hooks to compile on various distributions, on your own 
server are in the master.
I guess a better writeup about this would be nicer! Currently it is hidden 
in docker test suite documentation, only semi automized.

I am curious about initializer issue because it has been taking too much 
time from me. My guess is other people on the list are also confused about 
it. May be one alternative is we decie not to support CentOS6?

PS: googling about -Wno-missing-field-initializers pointed me to 1998 
references, see  the links in the second message on this thread.
https://stackoverflow.com/questions/1538943/why-is-the-compiler-throwing-this-warning-missing-initializer-isnt-the-stru

Paul: the initializer issue is not a one line change. Once you fix the one 
you noticed, more warnings like that will show up.

-antony

PS:
[1]
https://travis-ci.org/antonyantony/libreswan/builds/546142308
/home/build/libreswan/lib/libswan/addr_lookup.c:67:6: error: implicit declaration of function 'printf' [-Werror=implicit-function-declaration]
      printf("found peer %s to interface %s\n",