[lttng-dev] urcu configure/build failures on Darwin

[Mathieu Desnoyers]

----- On Jun 14, 2016, at 12:31 PM, Luke K D'Alessandro <ldalessa at indiana.edu> wrote: 

> I tried following the Darwin instructions on the website (basically `
> ./configure --build=x86_64-apple-darwin11` but the `clock_gettime` and `-lrt`
> dependencies don’t exist on Darwin).

> Just for fun I removed this dependency and added a custom version of
> `clock_gettime` (
> https://github.com/lorrden/darwin-posix-rt/blob/master/clock_gettime.c ) but
> the build still fails in `systcall-compat.h`.

> ```
> $ make V=1
> /Applications/Xcode.app/Contents/Developer/usr/bin/make all-recursive
> Making all in .
> /bin/sh ./libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I./urcu
> -I./urcu -Wall -g -O2 -D_THREAD_SAFE -pthread -MT wfqueue.lo -MD -MP -MF
> .deps/wfqueue.Tpo -c -o wfqueue.lo wfqueue.c
> libtool: compile: gcc -DHAVE_CONFIG_H -I. -I./urcu -I./urcu -Wall -g -O2
> -D_THREAD_SAFE -pthread -MT wfqueue.lo -MD -MP -MF .deps/wfqueue.Tpo -c
> wfqueue.c -fno-common -DPIC -o .libs/wfqueue.o
> In file included from wfqueue.c:28:
> In file included from ./urcu/static/wfqueue.h:33:
> In file included from ./urcu/uatomic.h:24:
> In file included from ./urcu/system.h:23:
> In file included from ./urcu/arch.h:27:
> ./urcu/syscall-compat.h:39:2: error: "Add platform support to
> urcu/syscall-compat.h"
> #error "Add platform support to urcu/syscall-compat.h"
> ^
> 1 error generated.
> make[2]: *** [wfqueue.lo] Error 1
> make[1]: *** [all-recursive] Error 1
> make: *** [all] Error 2
> ```

> Is Darwin still a supported platform for the library?

It should, yes, but we don't test it in our CI yet. 

I just took care of the syscall-compat.h error (pushed into master 
and stable-0.9). For clock_gettime, we would need to implement 
a LGPLv2.1 wrapper within liburcu for MacOSX. 

Is this something you could look into ? 

Thanks, 

Mathieu 

> Thanks,
> Luke

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-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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