[lttng-dev] [PATCH] urcu: fix deprecation warning with new glibc

[Marc Kleine-Budde]

On 06/01/2015 04:25 PM, Mathieu Desnoyers wrote:
> ----- On Jun 1, 2015, at 3:16 PM, Marc Kleine-Budde mkl at pengutronix.de wrote:
> 
>> This patch fixes the following warning:
>>
>> /usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE
>> are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
>> # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
> 
> And why does this patch just add _DEFAULT_SOURCE without removing _BSD_SOURCE ?
> Is it the intended transition path ? Is it documented somewhere ?

From http://man7.org/linux/man-pages/man7/feature_test_macros.7.html:

_BSD_SOURCE (deprecated since glibc 2.20)
[...]
Since glibc 2.20, this macro is deprecated.  It now has the
              same effect as defining _DEFAULT_SOURCE, but generates a com‐
              pile-time warning (unless _DEFAULT_SOURCE is also defined).
              Use _DEFAULT_SOURCE instead.  To allow code that requires
              _BSD_SOURCE in glibc 2.19 and earlier and _DEFAULT_SOURCE in
              glibc 2.20 and later to compile without warnings, define both
              _BSD_SOURCE and _DEFAULT_SOURCE.

Marc

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