[Bug 1895471] [NEW] compilation error with clang in util/async.c

[Amey Narkhede]

Public bug reported:

configured with ` CC=clang CXX=clang++ ../configure --target-
list=x86_64-softmmu --enable-kvm --enable-curl --enable-debug --enable-
jemalloc --enable-fuzzing --enable-sdl` and after make I get the
following error related to c11 atomics. I'm using clang because I'm
experimenting with fuzzer

[glitz@archlinux /code/qemu/build]$ ninja -j5
[479/2290] Compiling C object libqemuutil.a.p/util_async.c.o
FAILED: libqemuutil.a.p/util_async.c.o
clang -Ilibqemuutil.a.p -I. -I.. -Iqapi -Itrace -Iui -Iui/shader 
-I/usr/include/p11-kit-1 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/libmount -I/usr/include/blkid -I/usr/include/gio-unix-2.0 
-Ilinux-headers -Xclang -fcolor-diagnostics -pipe -Wall -Winvalid-pch -Werror 
-std=gnu99 -g -m64 -mcx16 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 
-D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wundef 
-Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv 
-Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self 
-Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels 
-Wexpansion-to-defined -Wno-initializer-overrides -Wno-missing-include-dirs 
-Wno-shift-negative-value -Wno-string-plus-int -Wno-typedef-redefinition 
-Wno-tautological-type-limit-compare -fstack-protector-strong 
-fsanitize=fuzzer-no-link -iquote /code/qemu/tcg/i386 -isystem 
/code/qemu/linux-headers -iquote . -iquote /code/qemu -iquote 
/code/qemu/accel/tcg -iquote /code/qemu/include -iquote 
/code/qemu/disas/libvixl -pthread -fPIC -MD -MQ libqemuutil.a.p/util_async.c.o 
-MF libqemuutil.a.p/util_async.c.o.d -o libqemuutil.a.p/util_async.c.o -c 
../util/async.c
../util/async.c:79:17: error: address argument to atomic operation must be a 
pointer to _Atomic type ('unsigned int *' invalid)
    old_flags = atomic_fetch_or(&bh->flags, BH_PENDING | new_flags);
                ^               ~~~~~~~~~~
/usr/lib/clang/10.0.1/include/stdatomic.h:138:42: note: expanded from macro 
'atomic_fetch_or'
#define atomic_fetch_or(object, operand) __c11_atomic_fetch_or(object, operand, 
__ATOMIC_SEQ_CST)
                                         ^                     ~~~~~~
../util/async.c:105:14: error: address argument to atomic operation must be a 
pointer to _Atomic type ('unsigned int *' invalid)
    *flags = atomic_fetch_and(&bh->flags,
             ^                ~~~~~~~~~~
/usr/lib/clang/10.0.1/include/stdatomic.h:144:43: note: expanded from macro 
'atomic_fetch_and'
#define atomic_fetch_and(object, operand) __c11_atomic_fetch_and(object, 
operand, __ATOMIC_SEQ_CST)
                                          ^                      ~~~~~~
2 errors generated.
[483/2290] Compiling C object libqemuutil.a.p/util_qemu-error.c.o
ninja: build stopped: subcommand failed.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1895471

Title:
  compilation error with clang in util/async.c

Status in QEMU:
  New

Bug description:
  configured with ` CC=clang CXX=clang++ ../configure --target-
  list=x86_64-softmmu --enable-kvm --enable-curl --enable-debug
  --enable-jemalloc --enable-fuzzing --enable-sdl` and after make I get
  the following error related to c11 atomics. I'm using clang because
  I'm experimenting with fuzzer

  [glitz@archlinux /code/qemu/build]$ ninja -j5
  [479/2290] Compiling C object libqemuutil.a.p/util_async.c.o
  FAILED: libqemuutil.a.p/util_async.c.o
  clang -Ilibqemuutil.a.p -I. -I.. -Iqapi -Itrace -Iui -Iui/shader 
-I/usr/include/p11-kit-1 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/libmount -I/usr/include/blkid -I/usr/include/gio-unix-2.0 
-Ilinux-headers -Xclang -fcolor-diagnostics -pipe -Wall -Winvalid-pch -Werror 
-std=gnu99 -g -m64 -mcx16 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 
-D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wundef 
-Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv 
-Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self 
-Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels 
-Wexpansion-to-defined -Wno-initializer-overrides -Wno-missing-include-dirs 
-Wno-shift-negative-value -Wno-string-plus-int -Wno-typedef-redefinition 
-Wno-tautological-type-limit-compare -fstack-protector-strong 
-fsanitize=fuzzer-no-link -iquote /code/qemu/tcg/i386 -isystem 
/code/qemu/linux-headers -iquote . -iquote /code/qemu -iquote 
/code/qemu/accel/tcg -iquote /code/qemu/include -iquote 
/code/qemu/disas/libvixl -pthread -fPIC -MD -MQ libqemuutil.a.p/util_async.c.o 
-MF libqemuutil.a.p/util_async.c.o.d -o libqemuutil.a.p/util_async.c.o -c 
../util/async.c
  ../util/async.c:79:17: error: address argument to atomic operation must be a 
pointer to _Atomic type ('unsigned int *' invalid)
      old_flags = atomic_fetch_or(&bh->flags, BH_PENDING | new_flags);
                  ^               ~~~~~~~~~~
  /usr/lib/clang/10.0.1/include/stdatomic.h:138:42: note: expanded from macro 
'atomic_fetch_or'
  #define atomic_fetch_or(object, operand) __c11_atomic_fetch_or(object, 
operand, __ATOMIC_SEQ_CST)
                                           ^                     ~~~~~~
  ../util/async.c:105:14: error: address argument to atomic operation must be a 
pointer to _Atomic type ('unsigned int *' invalid)
      *flags = atomic_fetch_and(&bh->flags,
               ^                ~~~~~~~~~~
  /usr/lib/clang/10.0.1/include/stdatomic.h:144:43: note: expanded from macro 
'atomic_fetch_and'
  #define atomic_fetch_and(object, operand) __c11_atomic_fetch_and(object, 
operand, __ATOMIC_SEQ_CST)
                                            ^                      ~~~~~~
  2 errors generated.
  [483/2290] Compiling C object libqemuutil.a.p/util_qemu-error.c.o
  ninja: build stopped: subcommand failed.

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