Xiao Yang <yangx.jy@xxxxxxxxxxxxxx> writes:
> [root@RHEL6U9GA_Intel64 blktests]# make
> make -C src all
> make[1]: Entering directory `/root/blktests/src'
> cc -Wall -o sg/syzkaller1 -O2 sg/syzkaller1.c
> sg/syzkaller1.c: In function ‘segv_handler’:
> sg/syzkaller1.c:118: warning: implicit declaration of function
> ‘__atomic_load_n’
> sg/syzkaller1.c:118: error: ‘__ATOMIC_RELAXED’ undeclared (first use
> in this function)
> sg/syzkaller1.c:118: error: (Each undeclared identifier is reported
> only once
> sg/syzkaller1.c:118: error: for each function it appears in.)
> sg/syzkaller1.c: In function ‘syz_open_dev’:
> sg/syzkaller1.c:204: warning: implicit declaration of function
> ‘__atomic_fetch_add’
> sg/syzkaller1.c:204: error: ‘__ATOMIC_SEQ_CST’ undeclared (first use
> in this function)
> sg/syzkaller1.c:204: warning: implicit declaration of function
> ‘__atomic_fetch_sub’
> sg/syzkaller1.c: In function ‘test’:
> sg/syzkaller1.c:406: error: ‘__ATOMIC_SEQ_CST’ undeclared (first use
> in this function)
> make[1]: *** [sg/syzkaller1] Error 1
> make[1]: Leaving directory `/root/blktests/src'
> make: *** [all] Error 2
> -----------------------------------------------------------------------------------------------------------------------
>
> It seems that __atomic_* functions are not available, and could you
> tell me how to fix
> the compiler error?
It seems like gcc 4.4 is too old to handle __ATOMIC_*. The oldest
version of gcc I tried was 4.8 which could handle this code perfectly
fine.
I think we need hacks in the makefile to see which compiler version we
have and conditionally compile the code.
Byte,
Johannes
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