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[Qemu-devel] [PATCH 1/2] compiler: add ignore_value() macro
From: |
Felipe Franciosi |
Subject: |
[Qemu-devel] [PATCH 1/2] compiler: add ignore_value() macro |
Date: |
Wed, 21 Sep 2016 16:27:01 +0100 |
On GCC versions 3.4 and newer, simply using (void) in front of a
function that has been declared with WUR will no longer suppress a
compilation warning. This commit brings the ignore_value() macro from
GNULIB's ignore_value.h, licensed under the terms of LGPLv2+.
See the link below for the original author's comment:
https://lists.nongnu.org/archive/html/qemu-devel/2016-09/msg05148.html
Signed-off-by: Felipe Franciosi <address@hidden>
---
include/qemu/compiler.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
index 338d3a6..655d0c7 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -26,6 +26,14 @@
#define QEMU_WARN_UNUSED_RESULT
#endif
+/* The ignore_value() macro comes from GNULIB's LGPLv2+ ignore-value.h */
+#if QEMU_GNUC_PREREQ(3, 4)
+# define ignore_value(x) \
+ (__extension__ ({ __typeof__ (x) __x = (x); (void) __x; }))
+#else
+# define ignore_value(x) ((void) (x))
+#endif
+
#if QEMU_GNUC_PREREQ(4, 0)
#define QEMU_SENTINEL __attribute__((sentinel))
#else
--
1.9.5
- [Qemu-devel] [PATCH 1/2] compiler: add ignore_value() macro,
Felipe Franciosi <=