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b2a137929a
Currently, builds of libevent in depends, using CMake, fail on some
systems, like Alpine, with the following:
```bash
/bitcoin/depends/work/build/aarch64-unknown-linux-musl/libevent/2.1.12-stable-1516ed47ea8/evmap.c: In function 'evmap_signal_add_':
/bitcoin/depends/work/build/aarch64-unknown-linux-musl/libevent/2.1.12-stable-1516ed47ea8/evmap.c:456:31: error: 'NSIG' undeclared (first use in this function)
456 | if (sig < 0 || sig >= NSIG)
```
From what I can tell the `_GNU_SOURCE` "detection" in libevents CMake build
system, never? really worked, and it's not clear what a nice fix is.
For now, always use `_GNU_SOURCE` when building libevent in depends.
Github-Pull: #30743
Rebased-From:
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||
|---|---|---|
| .. | ||
| bdb.mk | ||
| boost.mk | ||
| capnp.mk | ||
| expat.mk | ||
| fontconfig.mk | ||
| freetype.mk | ||
| libevent.mk | ||
| libmultiprocess.mk | ||
| libnatpmp.mk | ||
| libXau.mk | ||
| libxcb.mk | ||
| libxcb_util.mk | ||
| libxcb_util_image.mk | ||
| libxcb_util_keysyms.mk | ||
| libxcb_util_render.mk | ||
| libxcb_util_wm.mk | ||
| libxkbcommon.mk | ||
| miniupnpc.mk | ||
| native_capnp.mk | ||
| native_libmultiprocess.mk | ||
| packages.mk | ||
| qrencode.mk | ||
| qt.mk | ||
| sqlite.mk | ||
| systemtap.mk | ||
| xcb_proto.mk | ||
| xproto.mk | ||
| zeromq.mk | ||