[Buildroot] [PATCH 1/3] package/bitcoin: Fix static link of libevent

[Bernd Kuhls <bernd@kuhls.net>]

Buildroot commit fabcd7c8cc44e7e03c68bfcd2b4e2d10331a93f6 bumped the
package from 28.0 to 30.0 which includes upstream commit
https://github.com/bitcoin/bitcoin/commit/b619bdc3303217f4415342fe60e586e18fa48308
that was first included in version 29.0 and changed the linking of
libevent libraries.

This causes build errors when linked statically due to the wrong order
of libraries. To fix the problem we add a patch to change the order of
the libevent libraries.

The patch was not sent upstream because libevent support was removed
from the master branch with upstream commit:
https://github.com/bitcoin/bitcoin/commit/35d2d0679782581cbbf05babc59f0f28858a9b72

Fixes:
https://autobuild.buildroot.org/results/80e05370b6542ba2f5d2908bad7f420f76dc6831/

The oldest build error of this kind dates back to Dec 2025:
https://autobuild.buildroot.net/results/6bb/6bbd822d55dfcf3862e8b713323e0f34f65990ee/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
Gitlab pipelines passed:
https://gitlab.com/bkuhls/buildroot/-/commits/8d17d8107a074b94d628061a3c18917987141483

 .../0001-Fix-static-link-of-libevent.patch    | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 package/bitcoin/0001-Fix-static-link-of-libevent.patch

diff --git a/package/bitcoin/0001-Fix-static-link-of-libevent.patch b/package/bitcoin/0001-Fix-static-link-of-libevent.patch
new file mode 100644
index 0000000000..8c8e95bd0f
--- /dev/null
+++ b/package/bitcoin/0001-Fix-static-link-of-libevent.patch
@@ -0,0 +1,36 @@
+From 28c3533e5fb350fe1c27cf06dee6928825bc7bf2 Mon Sep 17 00:00:00 2001
+From: Bernd Kuhls <bernd@kuhls.net>
+Date: Sat, 18 Jul 2026 07:46:09 +0200
+Subject: [PATCH] Fix static link of libevent
+
+Change link order to fix build error
+
+/home/thomas/autobuild/instance-2/output-1/host/lib/gcc/i686-buildroot-linux-musl/14.3.0/../../../../i686-buildroot-linux-musl/bin/ld:
+ /home/thomas/autobuild/instance-2/output-1/host/i686-buildroot-linux-musl/sysroot/usr/lib/libevent_extra.a(http.o):
+ in function `evhttp_connection_retry':
+http.c:(.text+0x1f7b): undefined reference to `bufferevent_socket_get_conn_address_'
+
+Upstream: Not applicable (libevent support was removed in master branch)
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ src/CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index ad18115bbc..8e2a7bfcce 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -355,8 +355,8 @@ if(BUILD_CLI)
+     bitcoin_cli
+     bitcoin_common
+     bitcoin_util
+-    libevent::core
+     libevent::extra
++    libevent::core
+   )
+   install_binary_component(bitcoin-cli HAS_MANPAGE)
+ endif()
+-- 
+2.47.3
+
-- 
2.47.3

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