usb: split packet result into actual_length + status

[qemu.git] / compiler.h

diff --git a/compiler.h b/compiler.h
index 3a9b8a174beb3313ce44fa5c510621a99ffddf16..55d7d74775e02f7d3b30c2d771d0292b3779620d 100644 (file)
--- a/compiler.h
+++ b/compiler.h
@@ -18,7 +18,7 @@
 
 #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
@@ -30,8 +30,10 @@
 # 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 !QEMU_GNUC_PREREQ(4, 4)
@@ -42,10 +44,26 @@
    /* Use gnu_printf when supported (qemu uses standard format strings). */
 #  define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
 #  define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
+#  if defined(_WIN32)
+    /* Map __printf__ to __gnu_printf__ because we want standard format strings
+     * even when MinGW or GLib include files use __printf__. */
+#   define __printf__ __gnu_printf__
+#  endif
+# endif
+# if defined(__APPLE__)
+#  define QEMU_WEAK_ALIAS(newname, oldname) \
+        static typeof(oldname) weak_##newname __attribute__((unused, weakref(#oldname)))
+#  define QEMU_WEAK_REF(newname, oldname) (weak_##newname ? weak_##newname : oldname)
+# else
+#  define QEMU_WEAK_ALIAS(newname, oldname) \
+        typeof(oldname) newname __attribute__((weak, alias (#oldname)))
+#  define QEMU_WEAK_REF(newname, oldname) newname
 # endif
 #else
 #define GCC_ATTR /**/
 #define GCC_FMT_ATTR(n, m)
+#define QEMU_WEAK_ALIAS(newname, oldname) \
+        _Pragma("weak " #newname "=" #oldname)
 #endif
 
 #endif /* COMPILER_H */