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>
h'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=281fd9ad71f0e6276adcf4d058b4bcf09dd5e087'>root</a>/<a href='/guix/log/gnu?id=281fd9ad71f0e6276adcf4d058b4bcf09dd5e087'>gnu</a>/<a href='/guix/log/gnu/packages?id=281fd9ad71f0e6276adcf4d058b4bcf09dd5e087'>packages</a>/<a href='/guix/log/gnu/packages/perl-check.scm?id=281fd9ad71f0e6276adcf4d058b4bcf09dd5e087'>perl-check.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/packages/perl-check.scm?id=281fd9ad71f0e6276adcf4d058b4bcf09dd5e087&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-02-08 13:46:26 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=b9f9f9a3f4a3efe19fad7c7f15a7e637f24510dd'>gnu: perl-test-trailingspace: Update to 0.0600.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-trailingspace): Update to 0.0600.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:26 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=51f8be68316764dbf2a698ab4ffe3e421cf75eb8'>gnu: perl-test-simple: Update to 1.302183.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-simple): Update to 1.302183.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=1e4565eabca2026320eae6ac36b1c3361ddb19f6'>gnu: perl-test-runvalgrind: Update to 0.2.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-runvalgrind): Update to 0.2.2.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=072ef70a8e2b61679be25bc0af60d97afb26e827'>gnu: perl-test-requires: Update to 0.11.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-requires): Update to 0.11.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=d2cb69dfd4752ec32de092e5fad92a93caa0861b'>gnu: perl-test-taint: Update to 1.08.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-taint): Update to 1.08.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=bddb78e01a254e27574f0f55d4168816b8268c33'>gnu: perl-test-warnings: Update to 0.030.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-warnings): Update to 0.030.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=6b1fb33bc7509397ee63fcb67b48d7046f202f26'>gnu: perl-test-warn: Update to 0.36.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-warn): Update to 0.36.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-01-07 21:45:46 +0100'>2021-01-07</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=4203024e65925f322860d08cd6870ecf8203aba2'>gnu: perl-test-file: Update to 1.444.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-file): Update to 1.444.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-10-02 23:08:08 +0200'>2020-10-02</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=72313ff4ab7dda732378ad61209d299b3a534276'>gnu: perl-test-utf8: Update to 1.02.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-utf8): Update to 1.02.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>