[PATCH] lockable.h: always define unknown_lock_type

[PATCH] lockable.h: always define unknown_lock_type

[mingli.yu]

From: Mingli Yu <mingli.yu@windriver.com>

There comes below build failure when use gcc 10.1.0 and
"-Og" passed to compiler.
 | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: /mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:25: undefined reference to `unknown_lock_type'
 | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: ../fsdev/qemu-fsdev-throttle.o: in function `fsdev_co_throttle_request':
 | /mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:103: undefined reference to `unknown_lock_type'
 | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: ../fsdev/qemu-fsdev-throttle.o:/mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:103: more undefined references to `unknown_lock_type' follow
 | collect2: error: ld returned 1 exit status

So always define unknown_lock_type to fix the above error.

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
---
 include/qemu/lockable.h | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/qemu/lockable.h b/include/qemu/lockable.h
index b620023141..e792ed9a69 100644
--- a/include/qemu/lockable.h
+++ b/include/qemu/lockable.h
@@ -25,17 +25,12 @@ struct QemuLockable {
 };
 
 /* This function gives an error if an invalid, non-NULL pointer type is passed
- * to QEMU_MAKE_LOCKABLE.  For optimized builds, we can rely on dead-code elimination
- * from the compiler, and give the errors already at link time.
+ * to QEMU_MAKE_LOCKABLE.
  */
-#if defined(__OPTIMIZE__) && !defined(__SANITIZE_ADDRESS__)
-void unknown_lock_type(void *);
-#else
 static inline void unknown_lock_type(void *unused)
 {
     abort();
 }
-#endif
 
 static inline __attribute__((__always_inline__)) QemuLockable *
 qemu_make_lockable(void *x, QemuLockable *lockable)
-- 
2.26.2

[PATCH] lockable.h: always define unknown_lock_type

[mingli.yu]

From: Mingli Yu <mingli.yu@windriver.com>

There comes below build failure when use gcc 10.1.0 and
"-Og" passed to compiler.
 | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: /mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:25: undefined reference to `unknown_lock_type'
 | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: ../fsdev/qemu-fsdev-throttle.o: in function `fsdev_co_throttle_request':
 | /mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:103: undefined reference to `unknown_lock_type'
 | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: ../fsdev/qemu-fsdev-throttle.o:/mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:103: more undefined references to `unknown_lock_type' follow
 | collect2: error: ld returned 1 exit status

So always define unknown_lock_type to fix the above error.

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
---
 include/qemu/lockable.h | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/qemu/lockable.h b/include/qemu/lockable.h
index b620023141..e792ed9a69 100644
--- a/include/qemu/lockable.h
+++ b/include/qemu/lockable.h
@@ -25,17 +25,12 @@ struct QemuLockable {
 };
 
 /* This function gives an error if an invalid, non-NULL pointer type is passed
- * to QEMU_MAKE_LOCKABLE.  For optimized builds, we can rely on dead-code elimination
- * from the compiler, and give the errors already at link time.
+ * to QEMU_MAKE_LOCKABLE.
  */
-#if defined(__OPTIMIZE__) && !defined(__SANITIZE_ADDRESS__)
-void unknown_lock_type(void *);
-#else
 static inline void unknown_lock_type(void *unused)
 {
     abort();
 }
-#endif
 
 static inline __attribute__((__always_inline__)) QemuLockable *
 qemu_make_lockable(void *x, QemuLockable *lockable)
-- 
2.26.2

Re: [PATCH] lockable.h: always define unknown_lock_type

[Richard Henderson]

On 9/13/20 6:42 PM, mingli.yu@windriver.com wrote:
> From: Mingli Yu <mingli.yu@windriver.com>
> 
> There comes below build failure when use gcc 10.1.0 and
> "-Og" passed to compiler.
>  | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: /mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:25: undefined reference to `unknown_lock_type'
>  | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: ../fsdev/qemu-fsdev-throttle.o: in function `fsdev_co_throttle_request':
>  | /mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:103: undefined reference to `unknown_lock_type'
>  | /usr/lib/gcc/x86_64-wrs-linux/10.1.0/../../../../x86_64-wrs-linux/bin/ld.bfd: ../fsdev/qemu-fsdev-throttle.o:/mnt/build/tmp/work/x86_64-linux/qemu-system-native/5.1.0-r0/qemu-5.1.0/fsdev/qemu-fsdev-throttle.c:103: more undefined references to `unknown_lock_type' follow
>  | collect2: error: ld returned 1 exit status
> 
> So always define unknown_lock_type to fix the above error.

There's a lot that won't work with -Og, including stuff that uses
qemu_build_not_reached (which this itself should have been using).


r~