When compiling with C++, it treats
void (*rte_delay_us)(unsigned int us);
as definition of the global variable.
So further linking with librte_eal fails.
Fixes: b4d63fb622 ("eal: customize delay function")
Steps to reproduce:
$ cat rttm1.cpp
using namespace std;
int main(int argc, char *argv[])
{
int ret = rte_eal_init(argc, argv);
rte_delay_us(1);
cout << "return code ";
cout << ret;
return ret;
}
$ g++ -m64 -I/${RTE_SDK}/${RTE_TARGET}/include -c -o rttm1.o rttm1.cpp
$ gcc -m64 -pthread -o rttm1 rttm1.o -ldl -Wl,-lstdc++ \
-L/${RTE_SDK}/${RTE_TARGET}/lib -Wl,-lrte_eal
.../librte_eal.a(eal_common_timer.o):
(.bss+0x0): multiple definition of `rte_delay_us'
rttm1.o:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status
$ nm rttm1.o | grep rte_delay_us
0000000000000092 t _GLOBAL__sub_I_rte_delay_us
0000000000000000 B rte_delay_us
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
fd4015e98e