Fix FTBFS with GCC 11

guitarix-gcc-11-compat-volatile-atomic-variables.patch

@@ -0,0 +1,13 @@
+diff --git a/src/headers/gx_system.h b/src/headers/gx_system.h
+index d334ecfc..88d97567 100644
+--- a/src/headers/gx_system.h
++++ b/src/headers/gx_system.h
+@@ -132,7 +132,7 @@ inline T *atomic_get(T*& p) {
+ 
+ template <class T>
+ inline bool atomic_compare_and_exchange(T **p, T *oldv, T *newv) {
+-    return g_atomic_pointer_compare_and_exchange(reinterpret_cast<void* volatile*>(p), static_cast<void*>(oldv), newv);
++    return g_atomic_pointer_compare_and_exchange(reinterpret_cast<void**>(p), static_cast<void*>(oldv), newv);
+ }
+ 
+ 

guitarix.spec

@@ -5,13 +5,18 @@
 
 Name:           guitarix
 Version:        0.42.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        A virtual guitar amplifier
 License:        GPLv2+
 URL:            http://guitarix.sourceforge.net/
 Source0:        http://sourceforge.net/projects/%{name}/files/%{name}/%{altname2}-%{version}.tar.xz
 Source1:        %{name}.appdata.xml
 
+# Fix compilation with gcc 11 and glib g_atomic_pointer_compare_and_exchange()
+# See https://developer.gnome.org/glib/stable/glib-Atomic-Operations.html#g-atomic-pointer-compare-and-exchange
+# Patch from upstream https://sourceforge.net/p/guitarix/git/ci/d8f003484c57d808682025dfb07a7a1fb848afdc/
+Patch0:         %{name}-gcc-11-compat-volatile-atomic-variables.patch
+
 BuildRequires:  gcc-c++
 BuildRequires:  python3
 BuildRequires:  %{_bindir}/find
@@ -219,6 +224,9 @@ appstream-util validate-relax --nonet %{buildroot}%{_metainfodir}/%{name}.appdat
 %{_libdir}/lv2/*
 
 %changelog
+* Tue May 04 2021 Guido Aulisi <guido.aulisi@gmail.com> - 0.42.1-4
+- Fix FTBFS with GCC 11
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.42.1-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild