[dpdk-dev] [PATCH] eal: fix c++ compilation issue with rte_delay_us()

[Konstantin Ananyev <konstantin.ananyev@intel.com>]

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: b4d63fb62240 ("eal: customize delay function")

Steps to reproduce:

$ cat rttm1.cpp

#include <iostream>
#include <rte_eal.h>
#include <rte_cycles.h>

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>
---
 lib/librte_eal/common/include/generic/rte_cycles.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/include/generic/rte_cycles.h b/lib/librte_eal/common/include/generic/rte_cycles.h
index 96a2da9..00103ca 100644
--- a/lib/librte_eal/common/include/generic/rte_cycles.h
+++ b/lib/librte_eal/common/include/generic/rte_cycles.h
@@ -188,7 +188,7 @@ rte_get_timer_hz(void)
  * @param us
  *   The number of microseconds to wait.
  */
-void
+extern void
 (*rte_delay_us)(unsigned int us);
 
 /**
-- 
2.4.3