compiler: Add __designated_init annotation
This allows structure annotations for requiring designated initialization
in GCC 5.1.0 and later:
https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
The structure randomization layout plugin will be using this to help
identify structures that need this form of initialization.
Signed-off-by: Kees Cook <keescook@chromium.org>
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 0efef9c..386caf6 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -294,6 +294,14 @@
#define __no_sanitize_address __attribute__((no_sanitize_address))
#endif
+#if GCC_VERSION >= 50100
+/*
+ * Mark structures as requiring designated initializers.
+ * https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
+ */
+#define __designated_init __attribute__((designated_init))
+#endif
+
#endif /* gcc version >= 40000 specific checks */
#if !defined(__noclone)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index f811005..80a1dea 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -440,6 +440,10 @@
# define __attribute_const__ /* unimplemented */
#endif
+#ifndef __designated_init
+# define __designated_init
+#endif
+
#ifndef __latent_entropy
# define __latent_entropy
#endif