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[Qemu-devel] [PATCH for-4.0] compiler.h: Add an explicit check for the c
From: |
Thomas Huth |
Subject: |
[Qemu-devel] [PATCH for-4.0] compiler.h: Add an explicit check for the compiler version |
Date: |
Fri, 30 Nov 2018 11:43:40 +0100 |
The questions about our minimum compiler requirement pops up every
couple of months, and we then have to recall the details each time.
So let's document this in a proper way, by adding a comment and
check for the right compiler version to our compiler.h header.
Signed-off-by: Thomas Huth <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 ca9bc85..775446b 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -22,6 +22,14 @@
# define QEMU_GNUC_PREREQ(maj, min) 0
#endif
+/*
+ * We need at least GCC 4.1 for atomics support. Clang also supports these,
+ * and reports itself as GCC 4.2, so it passes this check, too.
+ */
+#if !QEMU_GNUC_PREREQ(4, 1)
+#error QEMU needs a compiler that is compatible with GCC v4.1 or newer
+#endif
+
#define QEMU_NORETURN __attribute__ ((__noreturn__))
#define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
--
1.8.3.1
- [Qemu-devel] [PATCH for-4.0] compiler.h: Add an explicit check for the compiler version,
Thomas Huth <=