Re: emulators/qemu: qemu ports failing due to compiler error on 12-CURRENT

On 29 Dec 2016, at 17:29, O. Hartmann <ohartmann_at_walstatt.org> wrote:
> 
> Am Wed, 7 Dec 2016 23:31:01 +0100
> Dimitry Andric <dim_at_FreeBSD.org> schrieb:
> 
>> On 07 Dec 2016, at 10:42, O. Hartmann <ohartmann_at_walstatt.org> wrote:
>>> 
>>> I try my first steps in cross compiling ports with poudriere and therefore I try to
>>> setup an appropriate jail and QEMU environment.
>>> 
>>> Well, I'm failing at the jail setup due to the non-exitence of any suitable QEMU
>>> environment and for that I tried to figure out to find some proper HOWTO.
>>> Searching via google ave some hints, but in questions which QEMU from ports should be
>>> used, all leave me alone, so I tried
>>> 
>>> emulators/qemu
>>> emulators/qemu-devel
>>> emulators/qemu-static
>>> 
>>> emulators/qemu is known for me to fail since months and the days of 11-CURRENT, there
>>> is a compiler error spit out with clang 3.8 and now 3.9. The very same for qemu-devel
>>> (both ports used with standard options, no extras). See also Bug 214873
>>> (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214873) and Bug 215100
>>> (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215100).
>> 
>> I couldn't reproduce the compilation errors, it builds fine for me until
>> the link phase.
> 
> Well, I face this in poudriere on the most recent 12-CURRENT, too as well as 12-CURRENT
> buildworld today.
> 
> On the host I'd like to run qemu for testing aarch64 binaries for a Odroid-C2 project, I
> use a customized /etc/src.conf - but on poudriere, there is no such customisation but
> the failing is identical.

Looking at your errors, it seems that the port has decided to enable
rdma support.  This is normally enabled using --enable-rdma with the
configure script, but I don't see that at all in the port Makefile.

On my systems, it runs a test to check for rdma support, but this fails.
Quoting from config.log:

    cc -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -I/usr/work/share/dim/ports/emulators/qemu/work/qemu-2.6.1 -I/usr/local/include -DPREFIX=\""/usr/local\"" -Wno-string-plus-int -Wno-initializer-overrides -Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-definition -Wtype-limits -fstack-protector-strong -I/usr/local/include -I/usr/local/include/p11-kit-1 -I/usr/local/include -o config-temp/qemu-conf.exe config-temp/qemu-conf.c -m64 -g -fstack-protector -L"/usr/local/lib" -lrdmacm -libverbs
    config-temp/qemu-conf.c:1:10: fatal error: 'rdma/rdma_cma.h' file not found
    #include <rdma/rdma_cma.h>
             ^

The minimal test program it tries to compile here is just this:

    #include <rdma/rdma_cma.h>
    int main(void) { return 0; }

and it attempts to link it with -lrdmacm -libverbs.  If this somehow
succeeds on your system, then it will think rdma support is available,
while apparently the support is not complete, if it misses the
rdma_getaddrinfo() function.

Do you have some Linux rdma or infiniband headers or libraries installed
into /usr or /usr/local?  This might be the cause of the problems.

If you don't want or care about rdma, you can try the following patch
(should similarly apply to the other qemu ports):

Index: emulators/qemu/Makefile
===================================================================
--- emulators/qemu/Makefile     (revision 429888)
+++ emulators/qemu/Makefile     (working copy)
_at__at_ -78,6 +78,7 _at__at_
                --disable-libssh2 --enable-debug \
                --prefix=${PREFIX} --cc=${CC} --enable-docs --disable-kvm \
                --disable-linux-user --disable-linux-aio --disable-xen \
+               --disable-rdma \
                --smbd=${LOCALBASE}/sbin/smbd --enable-debug-info --python=${PYTHON_CMD} \
                --extra-cflags=-I${WRKSRC}\ -I${LOCALBASE}/include\ -DPREFIX=\\\"\"${PREFIX}\\\"\"

-Dimitry