[libvirt] [PATCH] mac os x: don't compile failing example program on 32 bit mac os x

[Eric Blake]

[adding bug-gnulib]

On 09/28/2010 06:36 AM, Justin Clift wrote:
> This addresses a compilation failure issue reported last year on
> OS X:
>
>    https://www.redhat.com/archives/libvir-list/2009-May/msg00166.html

which in turn mentions:
>>
>> gcc -Wall -Wformat -Wmissing-prototypes -Wnested-externs -Wpointer- arith -Wextra -Wshadow -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Winline -Wredundant-decls -Wno-sign-compare -Wp,- D_FORTIFY_SOURCE=2 -fexceptions -fasynchronous-unwind-tables -g -O2 - o .libs/event-test event_test-event-test.o -L/opt/local/lib ../../../ src/.libs/libvirt.dylib -L/usr/lib /usr/lib/libxml2.dylib -licucore - lm /opt/local/lib/libgnutls.dylib /opt/local/lib/libtasn1.dylib -lz / opt/local/lib/libgcrypt.dylib /opt/local/lib/libgpg-error.dylib - lpthread /opt/local/lib/libintl.dylib /opt/local/lib/libiconv.dylib -lc
>>
>> Undefined symbols:
>>   "_rpl_poll$UNIX2003", referenced from:
>>       _main in event_test-event-test.o
>> ld: symbol(s) not found
>> collect2: ld returned 1 exit status
>> make[2]: *** [event-test] Error 1
>> make[1]: *** [all-recursive] Error 1
>> make: *** [all] Error 2
>>
>>
>> The UNIX2003 symbol does not exist in 10.4, only in 10.5.
>>

But the failed link mentions rpl_poll, not poll, which means this is 
most likely a gnulib bug in the poll module.  Rather than skipping this 
test on just 32-bit MacOS in libvirt, I think the better thing to do is 
address why gnulib is triggering a link failure in the first place.

> In testing here, the compilation only fails on 32 bit OS X, but works
> on 64 bit, even when using exact same compile and linking flags.
>
> This commit surgically disables compilation of this one example program
> on 32 bit Mac OS X (only).  Compilation still occurs, with a working
> executable produced, on 64 bit Mac OS X.
> ---
>   examples/domain-events/events-c/event-test.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org