Date: Mon, 25 Sep 2017 21:38:33 -0700 From: Russell Haley <russ.haley@gmail.com> To: freebsd-arm <freebsd-arm@freebsd.org> Subject: Why does this compile? Message-ID: <CABx9NuSzSzK87WF07S0B2aZpddKxYJf69kR2gWqBmHxaEQO6JA@mail.gmail.com>
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Hi,
I'm trying to compile the new dotnet core 2.0 and I've run into a C
problem I don't understand. Since I ran the code to check it on my arm
board, I'm going to ask here (the most knowledgeable fbsd C people I
could ask).
The cmake file is trying to test for a linux struct in_pktinfo:
check_c_source_compiles(
"
#include <${SOCKET_INCLUDES}>
int main()
{
struct in_pktinfo;
return 0;
}
"
HAVE_IN_PKTINFO)
SOCKET_INCLUDES resolves to netinet/in.h so the final source is:
#include <netinet/in.h>
int main()
{
struct in_pktinfo;
return 0;
}
This compiles on FreeBSD current and apparently on 11 too. That's a
bad thing because it's supposed to fail. I checked in.h and there is
no struct for in_pktinfo. Not surprisingly, if I remove the include
altogether, it still compiles.
I assume then that the original author made a mistake? My C is too
weak and most of my searches don't turn up anything close to what I'm
looking for.
Any suggestions would be awesome. :)
Thanks,
Russ
help
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