[systemd-devel] minimal-uclibc: systemd fails with `src/manager.c:257:42: error: 'EPOLL_CLOEXEC' undeclared (first use in this function)`

[Thierry Reding]

* Paul Menzel wrote:
> Dear OE folks,
> 
> 
> task compile of `systemd_git.bb` fails with the following error message
> using `minimal-uclibc` for `MACHINE = "beagleboard"`. Using `minimal`,
> i. e. EGLIBC, works.
> 
>         […]
>         |   CC     src/libsystemd_core_la-manager.lo
>         | src/manager.c: In function 'manager_new':
>         | src/manager.c:257:9: warning: implicit declaration of function 'epoll_create1' [-Wimplicit-function-declaration]
>         | src/manager.c:257:42: error: 'EPOLL_CLOEXEC' undeclared (first use in this function)
>         | src/manager.c:257:42: note: each undeclared identifier is reported only once for each function it appears in
>         | src/manager.c: In function 'manager_process_notify_fd':
>         | src/manager.c:1956:25: warning: cast increases required alignment of target type [-Wcast-align]
>         […]
> 
> `manager.c` includes
> 
>         #include <sys/epoll.h>
>         #include <fcntl.h>
> 
> which I read should contain that definition. But looking at `fcntl.h` I
> could not find it. I then looked in
> 
>         ./minimal-uclibc-dev/sysroots/armv7a-oe-linux-uclibceabi/usr/include/sys/epoll.h
> 
> where it is defined for EGLIBC but not for uClibc. I also found the
> patch for uClibc [1] but there `EPOLL_CLOEXEC` is enclosed in `#if 0`.
> 
> I am no uClibc expert, but do you know if uClibc will provide
> `EPOLL_CLOEXEC` in the near future? How should systemd fix that?

uClibc is also missing an implementation of the epoll_create1() syscall. I'm
using a patch against uClibc to fix a similar issue in udev but haven't
gotten around to sending it upstream yet.

Thierry
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