undefined reference when building a sharedlib

[yarf]

please advise?

foo.cpp:

#include <libcuckoo/cuckoohash_map.hh>
#include <libcuckoo/city_hasher.hh>

typedef cuckoohash_map<int, int> Map;
Map map;

$ g++ -Wall -fPIC -std=c++11 -shared -o foo.so foo.cpp
$ LD_PRELOAD=./foo.so someprocess
$ symbol lookup error: ./foo.so: undefined symbol: _ZN14cuckoohash_mapIiiSt4hashIiESt8equal_toIiEE6Bucket13key_allocatorE

[apc999]

hi Yarf,

(1) could you describe your system setting: e.g., OS and g++ version?

(2) under libcuckoo/examples/ , could you successfully "make" and run
binaries like "hellohash" or "count_freq"?

Thanks,

• Bin

On Sun, Mar 15, 2015 at 2:35 PM, yarf [email protected] wrote:

please advise?

foo.cpp:

#include <libcuckoo/cuckoohash_map.hh>
#include <libcuckoo/city_hasher.hh>
typedef cuckoohash_map<int, int> Map;
Map map;

$ g++ -Wall -fPIC -std=c++11 -shared -o foo.so foo.cpp
$ LD_PRELOAD=./foo.so someprocess
$ symbol lookup error: ./foo.so: undefined symbol:
_ZN14cuckoohash_mapIiiSt4hashIiESt8equal_toIiEE6Bucket13key_allocatorE

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#6.

Computer Science Department
Carnegie Mellon University

[yarf]

Hi Bin, and thanks for responding

1. g++ --version
   g++ (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
   same issue with clang++ too, btw
2. yes, and all the tests pass also

[manugoyal]

Hi yarf,

It seems like we forgot to externally declare some static variables in the
cuckoohash_map class. I just pushed a commit that fixes that. Let me know
if you're still having problems.

Thanks
-Manu

On Sun, Mar 15, 2015 at 2:53 PM, yarf [email protected] wrote:

Hi Bin, and thanks for responding

1. g++ --version
   g++ (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
   same issue with clang++ too, btw
2. yes, and all the tests pass also

On Sunday, March 15, 2015 2:48 PM, Bin Fan [email protected]
wrote:

hi Yarf,

(1) could you describe your system setting: e.g., OS and g++ version?

(2) under libcuckoo/examples/ , could you successfully "make" and run
binaries like "hellohash" or "count_freq"?

Thanks,

• Bin

On Sun, Mar 15, 2015 at 2:35 PM, yarf [email protected] wrote:

please advise?

foo.cpp:

#include <libcuckoo/cuckoohash_map.hh>
#include <libcuckoo/city_hasher.hh>
typedef cuckoohash_map<int, int> Map;
Map map;

$ g++ -Wall -fPIC -std=c++11 -shared -o foo.so foo.cpp
$ LD_PRELOAD=./foo.so someprocess
$ symbol lookup error: ./foo.so: undefined symbol:
_ZN14cuckoohash_mapIiiSt4hashIiESt8equal_toIiEE6Bucket13key_allocatorE

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#6.

Computer Science Department
Carnegie Mellon University
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#6 (comment).

[yarf]

That appears to have done the trick -- thanks!

[yarf]

spoke too soon, though this is a different issue:

#include <libcuckoo/cuckoohash_map.hh>
#include <libcuckoo/city_hasher.hh>

typedef cuckoohash_map<int, int> Map;
Map map;

static void _construct() __attribute__((constructor));
static void _construct()
{
        printf ("{\n");
        map[0] = 1010;
        printf ("}\n");
}

$ g++ -Wall -fPIC -std=c++11 -shared -o foo.so foo.cpp
$ LD_PRELOAD=./foo.so someprocess
{
Segmentation fault (core dumped)

I'm suspecting this may be due to constructor ordering ... any idea how to resolve?

[manugoyal]

I'm not sure this has to do with libcuckoo, it might be some weird c++
thing. When I compile the following file

#include

static void _construct() attribute((constructor));
static void _construct() {
std::cout << "hello" << std::endl;
}

$ g++-4.8 -Wall -fPIC -std=c++11 -shared -o test.so test.cpp
$ LD_PRELOAD=./test.so ./something
Segmentation fault (core dumped)

But when I do

#include <stdio.h>

static void _construct() attribute((constructor));
static void _construct() {
printf("hello\n");
}

$ g++-4.8 -Wall -fPIC -std=c++11 -shared -o test.so test.cpp
$ LD_PRELOAD=./test.so ./something
hello

On Mon, Mar 16, 2015 at 1:03 PM, yarf [email protected] wrote:

spoke too soon, though this is a different issue:

#include <libcuckoo/cuckoohash_map.hh>
#include <libcuckoo/city_hasher.hh>
typedef cuckoohash_map<int, int> Map;
Map map;
static void _construct() attribute((constructor));static void _construct()
{
printf ("{\n");
map[0] = 1010;
printf ("}\n");
}

$ g++ -Wall -fPIC -std=c++11 -shared -o foo.so foo.cpp
$ LD_PRELOAD=./foo.so someprocess
{
Segmentation fault (core dumped)

I'm suspecting this may be due to constructor ordering ... any idea how to
resolve?

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#6 (comment).

[yarf]

thanks Manu -- I see pain in my immediate future :)