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

From: Amey Narkhede <1895471@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1895471] Re: compilation error with clang in util/async.c
Date: Mon, 14 Sep 2020 10:52:16 -0000	[thread overview]
Message-ID: <160008073620.20744.1634136206585369571.malone@wampee.canonical.com> (raw)
In-Reply-To: 160002337216.747.16078826830052525094.malonedeb@chaenomeles.canonical.com

Ok. So I attached the util_async.o file below

** Attachment added: "util_async.c.o"
   https://bugs.launchpad.net/qemu/+bug/1895471/+attachment/5410694/+files/util_async.c.o

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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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