1 files changed, 53 insertions, 0 deletions
diff --git a/devel/simgear/files/patch-simgear-structure-SGAtomic.cxx b/devel/simgear/files/patch-simgear-structure-SGAtomic.cxx
new file mode 100644
index 000000000000..cb8ae35e2761
--- /dev/null
+++ b/devel/simgear/files/patch-simgear-structure-SGAtomic.cxx
@@ -0,0 +1,53 @@
+Work around:
+
+SGAtomic.cxx:48:5: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
+
+to fix build on i386 as Simgear uses CMAKE_CXX_STANDARD=17
+
+--- simgear/structure/SGAtomic.cxx.orig	2025-06-30 14:48:03 UTC
++++ simgear/structure/SGAtomic.cxx
+@@ -29,7 +29,7 @@
+ #if defined(_WIN32)
+ # include <windows.h>
+ #elif defined(GCC_ATOMIC_BUILTINS_FOUND)
+-#elif defined(__GNUC__) && defined(__i386__)
++#elif (__cplusplus < 201703L) && defined(__GNUC__) && defined(__i386__)
+ #elif defined(SGATOMIC_USE_MUTEX)
+ # include <mutex>
+ #else
+@@ -43,7 +43,7 @@ SGAtomic::operator++()
+     return InterlockedIncrement(reinterpret_cast<long volatile*>(&mValue));
+ #elif defined(GCC_ATOMIC_BUILTINS_FOUND)
+     return __sync_add_and_fetch(&mValue, 1);
+-#elif defined(__GNUC__) && defined(__i386__)
++#elif (__cplusplus < 201703L) && defined(__GNUC__) && defined(__i386__)
+     register volatile unsigned* mem = reinterpret_cast<volatile unsigned*>(&mValue);
+     register unsigned result;
+     __asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}"
+@@ -64,7 +64,7 @@ SGAtomic::operator--()
+     return InterlockedDecrement(reinterpret_cast<long volatile*>(&mValue));
+ #elif defined(GCC_ATOMIC_BUILTINS_FOUND)
+     return __sync_sub_and_fetch(&mValue, 1);
+-#elif defined(__GNUC__) && defined(__i386__)
++#elif (__cplusplus < 201703L) && defined(__GNUC__) && defined(__i386__)
+     register volatile unsigned* mem = reinterpret_cast<volatile unsigned*>(&mValue);
+     register unsigned result;
+     __asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}"
+@@ -85,7 +85,7 @@ SGAtomic::operator unsigned() const
+ #elif defined(GCC_ATOMIC_BUILTINS_FOUND)
+     __sync_synchronize();
+     return mValue;
+-#elif defined(__GNUC__) && defined(__i386__)
++#elif (__cplusplus < 201703L) && defined(__GNUC__) && defined(__i386__)
+     __asm__ __volatile__("": : : "memory");
+     return mValue;
+ #else
+@@ -102,7 +102,7 @@ SGAtomic::compareAndExchange(unsigned oldValue, unsign
+     return oldValue == InterlockedCompareExchange(lvPtr, newValue, oldValue);
+ #elif defined(GCC_ATOMIC_BUILTINS_FOUND)
+     return __sync_bool_compare_and_swap(&mValue, oldValue, newValue);
+-#elif defined(__GNUC__) && defined(__i386__)
++#elif (__cplusplus < 201703L) && defined(__GNUC__) && defined(__i386__)
+     register volatile unsigned* mem = reinterpret_cast<volatile unsigned*>(&mValue);
+     unsigned before;
+     __asm__ __volatile__("lock; cmpxchg{l} {%1,%2|%1,%2}"