backends: fix source dir stripping from rpaths

Commit e88887be4a08 ("Only remove substring if it is part of string")
removed the source dir from the rpath when the following check succeeds:

  if absdir.startswith(self.environment.get_source_dir()):
      rel_to_src = absdir[len(self.environment.get_source_dir()) + 1:]

For example, absdir '/myproject/foo' starts with source dir
'/myproject', so we want to generate the relative path 'foo'.

This code doesn't work with absdir '/myproject-libs/foo' though, because
we'll incorrectly turn it into a relative path 'libs/foo' after
stripping away '/myproject-'.

Use os.path.commonpath() instead of str.startswith() so path components
are correctly handled.

Cc: Niklas Claesson <niklas.claesson@cosylab.com>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>

0 files changed, 0 insertions, 0 deletions