[Qemu-devel] Link error with github source

[Nigel Horne]

The latest version in github fails to link (using gcc-7) with this error:

  LINK    aarch64-softmmu/qemu-system-aarch64
accel/tcg/cputlb.o: In function `helper_atomic_cmpxchgo_le_mmu':
cputlb.c:(.text+0x5f3d): undefined reference to 
`__atomic_compare_exchange_16'
accel/tcg/cputlb.o: In function `helper_atomic_cmpxchgo_be_mmu':
cputlb.c:(.text+0x6000): undefined reference to 
`__atomic_compare_exchange_16'
accel/tcg/cputlb.o: In function `helper_atomic_ldo_be_mmu':
cputlb.c:(.text+0x602f): undefined reference to `__atomic_load_16'
accel/tcg/cputlb.o: In function `helper_atomic_ldo_le_mmu':
cputlb.c:(.text+0x5f73): undefined reference to `__atomic_load_16'
accel/tcg/cputlb.o: In function `helper_atomic_sto_le_mmu':
cputlb.c:(.text+0x5fa9): undefined reference to `__atomic_store_16'
accel/tcg/cputlb.o: In function `helper_atomic_sto_be_mmu':
cputlb.c:(.text+0x607f): undefined reference to `__atomic_store_16'
collect2: error: ld returned 1 exit status
Makefile:197: recipe for target 'qemu-system-aarch64' failed
make[1]: *** [qemu-system-aarch64] Error 1
Makefile:328: recipe for target 'subdir-aarch64-softmmu' failed
make: *** [subdir-aarch64-softmmu] Error 2

-Nigel