Android 7: shared libs and text relocations
lazarus / 43-Android

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tk · 2017-07-17 07:29

I use my own FPC built shared libraries in a Xamarin application.
However,  this app issues ugly warning when run on an Android 7
device, see attachment.
(the Xamarin app is built with Android 4 target, that's my minimum. If
the app is built with Android 7 target then shared libs fail to load
and the app crashes).

Android log shows following notice:
Code: [Select]/data/app/WRMx_Mobile.Android-1/lib/arm/liboi_runtime.so
has text relocations. This is wasting memory and prevents security
hardening. Please fix.
I´ve googled about this issue a bit and found only that the cause
should be text (code section) relocations in the library.
I assumed the problem was with sections .rel.dyn or .rel.plt which
appear in the resulting binary file.
So I tried to compile with -fPIC but the resulting library binary was
the same as without -fPIC!

For Android I use now cross-tools auto-downloaded and supplied with
fpcupdeluxe (GNU binutils 2.24.90) and I cross-compile from Windows.
FPC #36236, Lazarus #54957, both last updated this year in May via
fpcupdeluxe.

Thank you for any help.

EDIT: I've found this issue
https://bugs.freepascal.org/view.php?id=31764 which should cover this,
will update FPC and test again and report.