diff mbox series

[PULL,6/8] includes: Replace QEMU_GNUC_PREREQ with "__has_builtin || !defined(__clang__)"

Message ID 1544606032-16924-7-git-send-email-thuth@redhat.com
State New
Headers show
Series [PULL,1/8] configure: Add a test for the minimum compiler version | expand

Commit Message

Thomas Huth Dec. 12, 2018, 9:13 a.m. UTC 
Since we require GCC version 4.8 or newer now, we can be sure that
the builtin functions are always available on GCC. And for Clang,
we can check the availablility with __has_builtin instead.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 include/qemu/compiler.h   | 2 +-
 include/qemu/host-utils.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
index 6b92710..1593bca 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -127,7 +127,7 @@ 
 #define __has_builtin(x) 0 /* compatibility with non-clang compilers */
 #endif
 
-#if __has_builtin(__builtin_assume_aligned) || QEMU_GNUC_PREREQ(4, 7)
+#if __has_builtin(__builtin_assume_aligned) || !defined(__clang__)
 #define HAS_ASSUME_ALIGNED
 #endif
 
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h
index 38da849..4cd170e 100644
--- a/include/qemu/host-utils.h
+++ b/include/qemu/host-utils.h
@@ -207,7 +207,7 @@  static inline int cto64(uint64_t val)
  */
 static inline int clrsb32(uint32_t val)
 {
-#if QEMU_GNUC_PREREQ(4, 7)
+#if __has_builtin(__builtin_clrsb) || !defined(__clang__)
     return __builtin_clrsb(val);
 #else
     return clz32(val ^ ((int32_t)val >> 1)) - 1;
@@ -223,7 +223,7 @@  static inline int clrsb32(uint32_t val)
  */
 static inline int clrsb64(uint64_t val)
 {
-#if QEMU_GNUC_PREREQ(4, 7)
+#if __has_builtin(__builtin_clrsbll) || !defined(__clang__)
     return __builtin_clrsbll(val);
 #else
     return clz64(val ^ ((int64_t)val >> 1)) - 1;