undefined symbol: clock_gettime when running on ubuntu 12.04 64 bit

[jimthunderbird]

I tried to compile php-uv with gcc 4.6.3 on ubuntu 12.04 64 bit box, it compiled successfully but when i run uv_default_loop() in the code, it says:
undefined symbol: clock_gettime

Best Regards,
Jim

[chobie]

hmm, it's strange. I've tested php-uv on Ubuntu 11.04 64bit box but I didn't meet the error.

clock_gettime depends librt and I specified it in config.m4.

https://github.com/chobie/php-uv/blob/master/config.m4#L71

for now, can you re-create php-uv module?

phpize --clean
phpize
./configure
make

I'll make ubuntu 12.04 64bit box and test this.

[jimthunderbird]

I tried the solution above, it does not work.

The symptom is, the uv.so is recognized correctly in php -m, but when i run a script with a uv_default_loop function call, it said: symbol lookup error, ... undefined symbol: clock_gettime

[jimthunderbird]

I just verified ubuntu 11.04 64bit works fine, so at this point, i think the issue is realted to either a ubuntu version difference or gcc version difference.

[jimthunderbird]

For ubuntu 12.04 64 bit now, I did a hack to make it work by using gcc 4.4.7.

Here is what I did:

apt-get install gcc-4.4
ln -s /usr/bin/gcc-4.4 /usr/bin/cc
ln -s /usr/bin/gcc-4.4 /usr/bin/gcc

After this recompile everything and things start working, but ideally, it should work for the latest gcc

[chobie]

I see. I'll modify config.m4 for latest gcc.

[jimthunderbird]

Great!

[chobie]

I spend some hours to fix this. But I couldn't fix at this moment. for now, please use gcc-4.4.7.
I have to learn libtool and autoconf more deeply. so this may take a long time.

[lucian303]

Even with gcc-4.4.7 I'm still getting this. I'll give it another shot and see if I can get it to compile with the older gcc. It's likely I'm missing something. Or perhaps other parts of the build chain need to be downgraded as well? It's a clean install of Ubuntu 12.04.01 64bit.

[jimthunderbird]

I did not try 10.04 64 bit yet, Di you try ubuntu 11.04 64bit?

[lucian303]

Oops, sorry, I meant 12.04. I'll edit.

[lucian303]

I recompiled php-uv by hand with the older gcc (4.4) on ubuntu 12.04.01 64bit and I can verify it works on there.

[chrsm]

Hi folks, just thought I'd drop this note here after struggling with the same thing.

After trying, for a while, unsuccessfully to get librt to be linked properly in the makefile, I went ahead and executed:

export LD_PRELOAD=/lib/x86_64-linux-gnu/librt.so.1

Prior to starting up my instance (i.e. if you're using apache/nginx or php5-fpm) and it works fine. It's a hack, but it works.

[chobie]

@chrsm thank you. i'll re-construct my ubuntu box and try to improve config.m4 later.

[romainneutron]

using export LD_PRELOAD=/lib/x86_64-linux-gnu/librt.so.1, compilation is OK, but I got a segfault when using uv_run_once() (in phpuv.c at line 3370)

I'll post a backtrace soon