Taken from upstream:
https://github.com/sigrokproject/pulseview/pull/39/commits/fb89dd11f2a4a08b73c498869789e38677181a8d.

From fb89dd11f2a4a08b73c498869789e38677181a8d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Wed, 28 Apr 2021 02:14:47 +0200
Subject: [PATCH] Fix broken build due to C++ template behind C linkage

glib/gatomic.h since 2.68 includes type_traits, which causes a compilation
error:
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/libsigrokdecode/libsigrokdecode.h:25,
                 from /home/abuild/rpmbuild/BUILD/pulseview-0.4.2/pv/data/decode/annotation.cpp:21:
/usr/include/c++/10/type_traits:2308:3: error: template with C linkage
2308 |   template<typename _CTp, typename _Rp>

As libsigrokdecode.h declares extern C linkage itself where necessary,
remove it from pulseviews include statements from the last two occasions.
---
 pv/data/decode/annotation.cpp  | 2 --
 pv/views/trace/decodetrace.cpp | 2 --
 2 files changed, 4 deletions(-)

diff --git a/pv/data/decode/annotation.cpp b/pv/data/decode/annotation.cpp
index 7f233478..f8a5c47b 100644
--- a/pv/data/decode/annotation.cpp
+++ b/pv/data/decode/annotation.cpp
@@ -17,9 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-extern "C" {
 #include <libsigrokdecode/libsigrokdecode.h>
-}
 
 #include <cassert>
 #include <vector>
diff --git a/pv/views/trace/decodetrace.cpp b/pv/views/trace/decodetrace.cpp
index 409f1d28..888064d0 100644
--- a/pv/views/trace/decodetrace.cpp
+++ b/pv/views/trace/decodetrace.cpp
@@ -17,9 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-extern "C" {
 #include <libsigrokdecode/libsigrokdecode.h>
-}
 
 #include <limits>
 #include <mutex>
>path: <a href='/guix/log/?id=ba3a03151e6971bdfa9a86af5179055601042ff8'>root</a>/<a href='/guix/log/gnu?id=ba3a03151e6971bdfa9a86af5179055601042ff8'>gnu</a>/<a href='/guix/log/gnu/services?id=ba3a03151e6971bdfa9a86af5179055601042ff8'>services</a>/<a href='/guix/log/gnu/services/nix.scm?id=ba3a03151e6971bdfa9a86af5179055601042ff8'>nix.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/nix.scm?id=ba3a03151e6971bdfa9a86af5179055601042ff8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-06-02 18:04:34 +0300'>2024-06-02</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=bc06affabcf68bbe93e9afee13bef8cc8c6336a2'>services: nix: Fix activation.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit follows 797be0ea5c3703ad96acd32c98dca5f946cf5c95.

Reported by kiasoc5 &lt;kiasoc5@disroot.org&gt; at
&lt;https://lists.gnu.org/archive/html/help-guix/2024-05/msg00185.html&gt;.

* gnu/services/nix.scm (nix-activation): Avoid provisioning the store if it
already exists.

Change-Id: I159e8af5d7bd6ce62857b356d6e9ac68fe16acf4
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2024-05-29 06:16:24 +0300'>2024-05-29</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=797be0ea5c3703ad96acd32c98dca5f946cf5c95'>services: nix: Mount Nix store read only.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/nix.scm (nix-shepherd-service): Add requirements.
(%nix-store-directory): New variable.
(nix-service-type): Add file-system-service-type extension.

Change-Id: I18a5d58c92c1f2b5b6dcecc3d5b439cc15bf4e49
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2022-12-15 10:13:24 +0000'>2022-12-15</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=f4dc53881b79b324ce7da731ac579a41c5078a48'>services: nix: Fix nix-shepherd-service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/nix.scm (nix-shepherd-service): Un-gexp build-directory.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2022-12-13 17:46:39 +0100'>2022-12-13</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=22acc0b0291cc067a6a3ce36c7ca8e5f68fe4db6'>services: nix: Add more configuration fields.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/nix.scm (&lt;nix-configuration&gt;)[build-directory]: New field.
(nix-service-etc, nix-shepherd-service): Take them into account.
* doc/guix.texi (Nix): Update it.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Petr Hodina</td></tr>