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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.hxx.orig 2025-06-30 15:01:54 UTC
+++ simgear/structure/SGAtomic.hxx
@@ -25,7 +25,7 @@
defined(__x86_64__)
// No need to include something. Is a Compiler API ...
# define SGATOMIC_USE_GCC4_BUILTINS
-#elif defined(__GNUC__) && defined(__i386__)
+#elif (__cplusplus < 201703L) && defined(__GNUC__) && defined(__i386__)
# define SGATOMIC_USE_LIBRARY_FUNCTIONS
#elif defined(__sgi) && defined(_COMPILER_VERSION) && (_COMPILER_VERSION>=730)
// No need to include something. Is a Compiler API ...
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