From: Thomas Huth <thuth@redhat.com>
To: qemu-s390x@nongnu.org, Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cohuck@redhat.com>, qemu-devel@nongnu.org
Subject: [PATCH 1/4] pc-bios/s390-ccw: Silence warning from Clang by marking panic() as noreturn
Date: Sun, 2 May 2021 19:48:33 +0200 [thread overview]
Message-ID: <20210502174836.838816-2-thuth@redhat.com> (raw)
In-Reply-To: <20210502174836.838816-1-thuth@redhat.com>
When compiling the s390-ccw bios with Clang, the compiler emits a warning:
pc-bios/s390-ccw/main.c:210:5: warning: variable 'found' is used uninitialized
whenever switch default is taken [-Wsometimes-uninitialized]
default:
^~~~~~~
pc-bios/s390-ccw/main.c:214:16: note: uninitialized use occurs here
IPL_assert(found, "Boot device not found\n");
^~~~~
It's a false positive, it only happens because Clang is not smart enough
to see that the panic() function in the "default:" case can never return.
Anyway, let's explicitely mark panic() with "noreturn" to shut up the
warning.
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
pc-bios/s390-ccw/s390-ccw.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index 6cd92669e9..79db69ff54 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -89,6 +89,7 @@ bool menu_is_enabled_enum(void);
#define MAX_BOOT_ENTRIES 31
+__attribute__ ((__noreturn__))
static inline void panic(const char *string)
{
sclp_print(string);
--
2.27.0
next prev parent reply other threads:[~2021-05-02 17:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-02 17:48 [PATCH 0/4] pc-bios/s390-ccw: Allow building with Clang, too Thomas Huth
2021-05-02 17:48 ` Thomas Huth [this message]
2021-05-02 18:57 ` [PATCH 1/4] pc-bios/s390-ccw: Silence warning from Clang by marking panic() as noreturn Philippe Mathieu-Daudé
2021-05-03 4:53 ` Thomas Huth
2021-05-03 7:40 ` Philippe Mathieu-Daudé
2021-05-03 4:56 ` Markus Armbruster
2021-05-03 8:54 ` Cornelia Huck
2021-05-02 17:48 ` [PATCH 2/4] pc-bios/s390-ccw: Fix the cc-option macro in the Makefile Thomas Huth
2021-05-02 17:48 ` [PATCH 3/4] pc-bios/s390-ccw: Silence GCC 11 stringop-overflow warning Thomas Huth
2021-05-03 9:00 ` Cornelia Huck
2021-05-03 9:30 ` Philippe Mathieu-Daudé
2021-05-03 9:31 ` Thomas Huth
2021-05-03 9:50 ` Philippe Mathieu-Daudé
2021-05-02 17:48 ` [PATCH 4/4] pc-bios/s390-ccw: Allow building with Clang, too Thomas Huth
2021-05-02 19:00 ` Philippe Mathieu-Daudé
2021-05-03 4:58 ` Markus Armbruster
2021-05-03 5:17 ` Thomas Huth
2021-05-03 8:10 ` David Hildenbrand
2021-05-03 8:23 ` Markus Armbruster
2021-05-03 9:14 ` Cornelia Huck
2021-05-03 9:17 ` David Hildenbrand
2021-05-03 9:23 ` Cornelia Huck
2021-05-03 9:31 ` Thomas Huth
2021-05-03 9:56 ` Cornelia Huck
2021-05-03 10:10 ` Christian Borntraeger
2021-05-03 10:00 ` Cornelia Huck
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