[PATCH v1] compiler.h: define CONFIG_GCC_VERSION

[Olaf Hering <olaf@xxxxxxxxx>]

Fixes commit fa5afbbc20ef3577c5338f9d0b24dad45cef59cd,
due to lack of commit 534519f0514f52007d504e0f2eeb714de7b2468d.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---
 xen/include/xen/compiler.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index 85cbd1ab00..e2b7193042 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -99,6 +99,13 @@
     __asm__ ("" : "=r"(__ptr) : "0"(ptr));      \
     (typeof(ptr)) (__ptr + (off)); })
 
+#ifndef CONFIG_GCC_VERSION
+# ifdef __GNUC__
+#  define CONFIG_GCC_VERSION (__GNUC__ * 10000           \
+                              + __GNUC_MINOR__ * 100     \
+                              + __GNUC_PATCHLEVEL__)
+# endif
+#endif
 #if CONFIG_GCC_VERSION >= 110000 /* See gcc bug 100680. */
 # define gcc11_wrap(x) RELOC_HIDE(x, 0)
 #else