prep: Initialize PC speaker

[qemu.git] / compiler.h

diff --git a/compiler.h b/compiler.h
index 9af5dc6c91dc7315559449589d3209488c07e2f5..736e77075ae47d9707946f982478e78d764b0fff 100644 (file)
--- a/compiler.h
+++ b/compiler.h
@@ -5,19 +5,38 @@
 
 #include "config-host.h"
 
+/*----------------------------------------------------------------------------
+| The macro QEMU_GNUC_PREREQ tests for minimum version of the GNU C compiler.
+| The code is a copy of SOFTFLOAT_GNUC_PREREQ, see softfloat-macros.h.
+*----------------------------------------------------------------------------*/
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+# define QEMU_GNUC_PREREQ(maj, min) \
+         ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+# define QEMU_GNUC_PREREQ(maj, min) 0
+#endif
+
 #define QEMU_NORETURN __attribute__ ((__noreturn__))
-#ifdef CONFIG_GCC_ATTRIBUTE_WARN_UNUSED_RESULT
+
+#if QEMU_GNUC_PREREQ(3, 4)
 #define QEMU_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define QEMU_WARN_UNUSED_RESULT
 #endif
 
+#if defined(_WIN32)
+# define QEMU_PACKED __attribute__((gcc_struct, packed))
+#else
+# define QEMU_PACKED __attribute__((packed))
+#endif
+
+#define cat(x,y) x ## y
+#define cat2(x,y) cat(x,y)
 #define QEMU_BUILD_BUG_ON(x) \
-    typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1];
+    typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1];
 
 #if defined __GNUC__
-# if (__GNUC__ < 4) || \
-     defined(__GNUC_MINOR__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 4)
+# if !QEMU_GNUC_PREREQ(4, 4)
    /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
 #  define GCC_ATTR __attribute__((__unused__, format(printf, 1, 2)))
 #  define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))