Po Lu wrote:
> The compilation is done on the host machine that's building Emacs (to
> produce emacs.so), which is then copied to the lib directory in the APK
> package.
I see. There are two ways to build C programs for Android:
(A) The way it is designed by Google: With the Android NDK,
that includes a cross-compiler. For the runtime, use an emulator
(based on qemu) or a physical connection to a real device.
(B) Inside a terminal emulator app (Termux [1][2] for Android ≥ 7,
Terminal-IDE [3] for Android < 5).
(A) is a POSIX-like environment only at the C level; it has no shell and no
utilities.
(B) is a POSIX-like environment including shell and utilities.
For building a real app, the approach (A) is what one needs.
But for building and testing a library, the approach (B) provides
- an environment that allows to reuse build infrastructure (configure etc.)
from GNU,
- faster turnaround cycles.
For Gnulib, we have only used approach (B). We *hope* that the resulting
source code will also work well in situation (A). But when you hit a problem
in situation (A), you are on your own. Because I won't install an NDK and
get into the complexities of cross-compilation, APK packaging, and so on.
> > Again, what is the Android API level that you are using?
> 19.
This is supported with Gnulib, as I have done a lot of testing with Android 4.3
(API level 18).
Bruno
[1] https://f-droid.org/en/packages/com.termux/
[2] https://wiki.termux.com/wiki/Main_Page
[3] https://www.spartacusrex.com/terminalide.htm
