#define _LTTNG_WRAPPER_COMPILER_H
#include <linux/compiler.h>
+#include <lttng/kernel-version.h>
/*
* Don't allow compiling with buggy compiler.
# error Your gcc version produces clobbered frame accesses
# endif
# endif
+
+/*
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
+ */
+# ifdef __aarch64__
+# if GCC_VERSION < 50100
+# error Your gcc version performs unsafe access to deallocated stack
+# endif
+# endif
+
#endif
/*
# define WRITE_ONCE(x, val) ({ ACCESS_ONCE(x) = val; })
#endif
+/*
+ * In v4.15 a smp read barrier was added to READ_ONCE to replace
+ * lockless_dereference(), replicate this behavior on prior kernels
+ * and remove calls to smp_read_barrier_depends which was dropped
+ * in v5.9.
+ */
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,15,0))
+#define LTTNG_READ_ONCE(x) READ_ONCE(x)
+#else
+#define LTTNG_READ_ONCE(x) \
+({ \
+ typeof(x) __val = READ_ONCE(x); \
+ smp_read_barrier_depends(); \
+ __val; \
+})
+#endif
+
#define __LTTNG_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ }
+/*
+ * The static_assert macro was defined by the kernel in v5.1.
+ * If the macro is not defined, we define it.
+ * (kernel source: include/linux/build_bug.h)
+ */
+#ifndef static_assert
+
+# define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
+# define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
+
+#endif
+
#endif /* _LTTNG_WRAPPER_COMPILER_H */