Not running on Travis CI precise environment

[Etiene]

Hello! I need some help getting bcrypt to work :)
It works fine on my machine (osx), but not on Travis CI precise environment (ubuntu 12.04):

error loading module 'bcrypt' from file '/home/travis/build/sailorproject/sailor/install/luarocks/lib/lua/5.1/bcrypt.so':
    /home/travis/build/sailorproject/sailor/install/luarocks/lib/lua/5.1/bcrypt.so: undefined symbol: clock_gettime

https://travis-ci.org/sailorproject/sailor/jobs/109013322

Line 165 shows gcc version is 4.6.3
Line 306 shows libc6 version is 2.15
Updating gcc did not solve the problem
I tried many things but I did not succeed in updating libc6

I noticed you do add -lrt flag on compiling, I thought it should be enough, but well, I dont know what's going on then...

This is the luarocks output when installing bcrypt on travis machine

Using https://luarocks.org/bcrypt-2.1-2.src.rock... switching to 'build' mode
Warning: variable CFLAGS was not passed in build_variables
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG -O0 -c -o compat/safebfuns.o compat/safebfuns.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o compat/bcrypt/bcrypt.o compat/bcrypt/bcrypt.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o compat/bcrypt/blowfish.o compat/bcrypt/blowfish.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o compat/arc4random/arc4random.o compat/arc4random/arc4random.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o compat/strlcpy.o compat/strlcpy.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o compat/sha/sha512.o compat/sha/sha512.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o compat/getentropy/getentropy_linux.o compat/getentropy/getentropy_linux.c
gcc -I/home/travis/build/sailorproject/sailor/install/lua/include -DOPENSSL_cleanse=explicit_bzero -D__BSD_VISIBLE -DHAVE_STRNDUP -Iinclude -Wall -Wno-pointer-sign -O2 -fPIC -DNDEBUG   -c -o src/main.o src/main.c
gcc -o bcrypt.so -shared -lrt compat/safebfuns.o compat/bcrypt/bcrypt.o compat/bcrypt/blowfish.o compat/arc4random/arc4random.o compat/strlcpy.o compat/sha/sha512.o compat/getentropy/getentropy_linux.o src/main.o
Updating manifest for /home/travis/build/sailorproject/sailor/install/luarocks/lib/luarocks/rocks
bcrypt 2.1-2 is now built and installed in /home/travis/build/sailorproject/sailor/install/luarocks (license: ISC)

Thanks for your help :)

[moteus]

I think you need link with rt library (https://github.com/zeromq/lzmq/blob/master/rockspecs/lzmq-timer-0.4.2-1.rockspec#L24-L30).

[Etiene]

That was my first thought, but apparently it's already being linked? (https://github.com/mikejsavage/lua-bcrypt/blob/master/Makefile.mess#L37)

[xspager]

Try moving LDFLAGS to the end of the line in https://github.com/mikejsavage/lua-bcrypt/blob/master/Makefile#L16 (suggestion from http://stackoverflow.com/a/8088766)

[Etiene]

According to your link it doesn't really need to be at the end of the line, just after bcrypt.so, which is already happening...

[Etiene]

Oh no, wait, I confused it! Ok, I'm gonna try that

[mikejsavage]

Thanks for the report, and thanks xspager for the fix!

[Etiene]

I already retried with the 2.1-3 build and it's solved on my end!
Thank you all! <3