Linking failure when using vendored feature

[est31]

There seems to be a linking failure on travis when I test the new botan feature to vendor sources.

Link to a failed build: https://travis-ci.com/github/est31/rcgen/jobs/391529962

Excerpt from the logs:

error: linking with `cc` failed: exit code: 1
[...]
note: /usr/bin/ld: /home/travis/build/est31/rcgen/target/debug/deps/libbotan_sys-59cd180e5db8bbbc.rlib(ffi.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC

          /home/travis/build/est31/rcgen/target/debug/deps/libbotan_sys-59cd180e5db8bbbc.rlib: error adding symbols: Bad value

          collect2: error: ld returned 1 exit status

It works locally on my machine.

[randombit]

Interesting. Botan always compiles with PIC even for a static library only target, to support linking the library into an .so or a PIE executable. So I'm not sure how this could happen.

[est31]

Using newer ubuntu versions (18.04 instead of 16.04) fixed the issue for me: rustls/rcgen@edf1095