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Re: [Qemu-devel] [PATCH RFC] configure: fix clang failure for libatomic
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH RFC] configure: fix clang failure for libatomic |
Date: |
Tue, 25 Apr 2017 10:04:54 +0100 |
On 25 April 2017 at 09:58, Nikunj A Dadhania <address@hidden> wrote:
> I was trying out the program in the configure script with clang and I do
> get errors without libatomic:
>
> $ clang /tmp/atomic.c
> /tmp/atomic.c:6:7: warning: implicit declaration of function
> '__atomic_load_8' is invalid in C99 [-Wimplicit-function-declaration]
> y = __atomic_load_8(&x, 0);
> ^
> /tmp/atomic.c:7:3: warning: implicit declaration of function
> '__atomic_store_8' is invalid in C99 [-Wimplicit-function-declaration]
> __atomic_store_8(&x, y, 0);
> ^
> /tmp/atomic.c:8:3: warning: implicit declaration of function
> '__atomic_compare_exchange_8' is invalid in C99
> [-Wimplicit-function-declaration]
> __atomic_compare_exchange_8(&x, &y, x, 0, 0, 0);
> ^
> /tmp/atomic.c:9:3: warning: implicit declaration of function
> '__atomic_exchange_8' is invalid in C99 [-Wimplicit-function-declaration]
> __atomic_exchange_8(&x, y, 0);
> ^
> /tmp/atomic.c:10:3: warning: implicit declaration of function
> '__atomic_fetch_add_8' is invalid in C99 [-Wimplicit-function-declaration]
> __atomic_fetch_add_8(&x, y, 0);
> ^
> 5 warnings generated.
> /tmp/atomic-1660e0.o: In function `main':
> /tmp/atomic.c:(.text+0x28): undefined reference to `__atomic_load_8'
> /tmp/atomic.c:(.text+0x40): undefined reference to `__atomic_store_8'
> /tmp/atomic.c:(.text+0x69): undefined reference to
> `__atomic_compare_exchange_8'
> /tmp/atomic.c:(.text+0x7d): undefined reference to `__atomic_exchange_8'
> /tmp/atomic.c:(.text+0x91): undefined reference to `__atomic_fetch_add_8'
> clang-3.9: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> With -latomic, the linker succeeds in getting the binary.
What host is this on ?
thanks
-- PMM
Re: [Qemu-devel] [PATCH RFC] configure: fix clang failure for libatomic, Richard Henderson, 2017/04/25