[Qemu-devel] [PATCH 1/1] added configure check for _Static_assert and updated QEMU_BUILD_BUG_ON(...) accordingly

[Andreas Grapentin <andreas@grapentin.org>]

---
 configure               | 18 ++++++++++++++++++
 include/qemu/compiler.h |  4 +++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 75c7c3526c..e9b33d9cf8 100755
--- a/configure
+++ b/configure
@@ -4725,6 +4725,20 @@ if compile_prog "" "" ; then
 fi
 
 ##########################################
+# check for _Static_assert()
+
+have_static_assert=no
+cat > $TMPC << EOF
+_Static_assert(1, "success.");
+int main(void) {
+    return 0;
+}
+EOF
+if compile_prog "" "" ; then
+    have_static_assert=yes
+fi
+
+##########################################
 # End of CC checks
 # After here, no more $cc or $ld runs
 
@@ -5694,6 +5708,10 @@ if test "$have_sysmacros" = "yes" ; then
   echo "CONFIG_SYSMACROS=y" >> $config_host_mak
 fi
 
+if test "$have_static_assert" = "yes" ; then
+  echo "CONFIG_STATIC_ASSERT=y" >> $config_host_mak
+fi
+
 # Hold two types of flag:
 #   CONFIG_THREAD_SETNAME_BYTHREAD  - we've got a way of setting the name on
 #                                     a thread we have a handle to
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
index e0ce9ffb28..37a65d4bb7 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -90,7 +90,9 @@
         int:(x) ? -1 : 1; \
     }
 
-#ifdef __COUNTER__
+#if defined(CONFIG_STATIC_ASSERT)
+#define QEMU_BUILD_BUG_ON(x) _Static_assert(!(x), #x)
+#elif defined(__COUNTER__)
 #define QEMU_BUILD_BUG_ON(x) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \
     glue(qemu_build_bug_on__, __COUNTER__) __attribute__((unused))
 #else
-- 
2.12.0