Cannot find libfaketime.so.1 using compiler.find_library()

[andy5995]

Where I'm testing locally, libfaketime.so.1 is in /usr/lib/faketime. This code is not finding it:

faketime_lib = cc.find_library(
  'faketime',
  dirs: [
    '/usr/lib/faketime',
    '/lib/x86_64-linux-gnu/faketime',
    '/lib/aarch64-linux-gnu/faketime'
    ],
  required: true
  )

After a little more testing, I see now that meson will find it if I create a libfaketime.so symlink to the so.1 file.

I wonder why on Manjaro and Ubuntu Linux (the only two I've tried this on), the .so symlink isn't created when installing the package.

I am trying to use faketime for a test setup:

add_test_setup(
    'epochalypse',
    env: [
        #'LD_PRELOAD=' + faketime_lib.full_path(),
        'LD_PRELOAD=/usr/lib/faketime/libfaketime.so.1',
        'FAKETIME=+14y'
    ]
)

Any suggestions as to a different approach? Maybe it would be best if I bundled the faketime source with my project.

[jpakkane]

You need to install the corresponding -dev package to get the symlink. This applies to all shared library dependencies.

[andy5995]

There is no corresponding '-dev' package available for Ubuntu or Manjaro.

[jpakkane]

FWICT you are not supposed to link against faketime, instead you have to set LD_PRELOAD when launching your program. find_library only finds libraries you can directly link against.

[andy5995]

@jpakkane You are correct. I set LD_PRELOAD in the call to add_test_setup() (example in original post). I was hoping I could get the path somehow when the library was found.

Since I'm not actually linking against libfaketime, in this case, it might be best if I were using a function that just finds any file.

[eli-schwartz]

Does the faketime program wrapper not work for your use case?

[andy5995]

I didn't think of it. Yes it does. Here's my working code:

faketime = find_program('faketime', required : false)
if faketime.found()
  add_test_setup(
    'epochalypse',
    exe_wrapper : [faketime, '-f', '+14y']
  )
endif

Thanks, again!