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Timur Davydov has posted comments on this change by Timur Davydov. ( 
https://gerrit.osmocom.org/c/libosmocore/+/41878?usp=email )

Change subject: build: control USE_NETNS via configure.ac
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Patch Set 3:

(1 comment)

Patchset:

PS2:
> So are you saying that once you build & run with emscripten you can really 
> use the netns code just f […]
No, I'm not claiming that netns functionality is usable at runtime on the Web.

What actually fails without building netns support are compile-time
errors in netdev.c. When netns.h is effectively disabled, netdev.c still
references the netns API and types, which leads to build failures such as:

  - incomplete type `struct osmo_netns_switch_state`
  - implicit declaration of `osmo_netns_open_fd()`
  - implicit declaration of `osmo_netns_switch_enter()`
  - implicit declaration of `osmo_netns_switch_exit()`

So the problem is not a runtime failure, but missing declarations when
netns.h is excluded via conditional compilation.

The change makes the availability of netns code explicit at configure
time (`USE_NETNS`) instead of hard-wiring it to `__linux__`, so the build
can be structured consistently across targets.



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Gerrit-Project: libosmocore
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Gerrit-Change-Id: I2322eb2936bea35596f1fd6b6a713ea5f997b1ea
Gerrit-Change-Number: 41878
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