Andreas Grapentin 4f6ba5a2dc use _Static_assert in QEMU_BUILD_BUG_ON ... QEMU_BUILD_BUG_ON should use C11's _Static_assert, if the compiler supports it, to provide more readable messages on failure. We check for _Static_assert in configure, and set CONFIG_STATIC_ASSERT accordingly. QEMU_BUILD_BUG_ON invokes _Static_assert if CONFIG_STATIC_ASSERT is defined, and reverts to the old way otherwise. That way, systems without C11 conforming compiler will still have the old messages, as verified by intentionally breaking the configure check. the following example output was generated by inverting the condition in QEMU_BUILD_BUG_ON: without _Static_assert: > In file included from /qemu/include/qemu/osdep.h:36:0, > from /qemu/qga/commands.c:13: > /qemu/qga/commands.c: In function ‘qmp_guest_exec_status’: > /qemu/include/qemu/compiler.h:89:12: error: negative width in bit-field ‘<anonymous>’ > struct { \ > ^ > /qemu/include/qemu/compiler.h:96:38: note: in expansion of macro QEMU_BUILD_BUG_ON_STRUCT’ > #define QEMU_BUILD_BUG_ON(x) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \ > ^~~~~~~~~~~~~~~~~~~~~~~~ > /qemu/include/qemu/atomic.h:146:5: note: in expansion of macro ‘QEMU_BUILD_BUG_ON’ > QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ > ^~~~~~~~~~~~~~~~~ > /qemu/include/qemu/atomic.h:417:5: note: in expansion of macro ‘atomic_load_acquire’ > atomic_load_acquire(ptr) > ^~~~~~~~~~~~~~~~~~~ > /qemu/qga/commands.c:160:21: note: in expansion of macro ‘atomic_mb_read’ > bool finished = atomic_mb_read(&gei->finished); > ^~~~~~~~~~~~~~ with _Static_assert: > In file included from /qemu/include/qemu/osdep.h:36:0, > from /qemu/qga/commands.c:13: > /qemu/qga/commands.c: In function ‘qmp_guest_exec_status’: > /qemu/include/qemu/compiler.h:94:30: error: static assertion failed: "not expecting: sizeof(*&gei->finished) > sizeof(void *)" > #define QEMU_BUILD_BUG_ON(x) _Static_assert((x), #x) > ^ > /qemu/include/qemu/atomic.h:146:5: note: in expansion of macro ‘QEMU_BUILD_BUG_ON’ > QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ > ^~~~~~~~~~~~~~~~~ > /qemu/include/qemu/atomic.h:417:5: note: in expansion of macro ‘atomic_load_acquire’ > atomic_load_acquire(ptr) > ^~~~~~~~~~~~~~~~~~~ > /qemu/qga/commands.c:160:21: note: in expansion of macro ‘atomic_mb_read’ > bool finished = atomic_mb_read(&gei->finished); > ^~~~~~~~~~~~~~ Backports commit 49e00a18708e27c815828d9440d5c9300d19547c from qemu		2018-03-20 10:42:20 -04:00
..
crypto
exec	target-*: Don't redefine cpu_exec()	2018-03-20 07:02:47 -04:00
fpu	configure: Drop ancient Solaris 9 and earlier support	2018-03-09 12:14:21 -05:00
hw	machine: use class base init generated name	2018-03-11 16:54:40 -04:00
qapi	qlit: add qobject_from_qlit()	2018-03-20 10:30:41 -04:00
qemu	use _Static_assert in QEMU_BUILD_BUG_ON	2018-03-20 10:42:20 -04:00
qom	numa: move numa_node from CPUState into target specific classes	2018-03-20 06:46:20 -04:00
sysemu	tcg: add options for enabling MTTCG	2018-03-02 09:25:01 -05:00
config.h
elf.h	include/elf: Update elf.h to commit f71a8eaffba3271cf7cdad95572f6996f7523a5b	2018-03-11 15:34:35 -04:00
glib_compat.h	memory: Share FlatView's and dispatch trees between address spaces	2018-03-11 22:05:44 -04:00
qemu-common.h	tcg: Add EXCP_ATOMIC	2018-02-27 11:57:58 -05:00