[xen staging] clang: don't define nocall

[patchbot@xxxxxxx]

commit 9164e93203979755bfa8bf81a1e8e9f8125d4414
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Fri May 29 17:52:06 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 29 17:52:06 2020 +0200

    clang: don't define nocall
    
    Clang doesn't support attribute error, and the possible equivalents
    like diagnose_if don't seem to work well in this case as they trigger
    when when the function is not called (just by being used by the
    APPEND_CALL macro).
    
    Define nocall to a noop on clang until a proper solution can be found.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    [jb: error -> __error__]
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/include/xen/compiler.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index c22439b7a4..c0e0ee9f27 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -20,7 +20,11 @@
 
 #define __weak        __attribute__((__weak__))
 
-#define nocall        __attribute__((error("Nonstandard ABI")))
+#if !defined(__clang__)
+# define nocall       __attribute__((__error__("Nonstandard ABI")))
+#else
+# define nocall
+#endif
 
 #if (!defined(__clang__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 5))
 #define unreachable() do {} while (1)
--
generated by git-patchbot for /home/xen/git/xen.git#staging