bug#65319: compilation error on Android (Termux)

[Bruno Haible]

Po Lu wrote:
> Does Gnulib guarantee that the gl_CHECK_FUNCS_ANDROID stuff will
> continue to exist in the future?  If so, I'm inclined towards using
> that.

Yes. This macro is used over 100 times in Gnulib, has not seen any
problem reports in the last 6 months, and is prefixed with 'gl_'
not '_gl_'. Therefore it's very unlikely to go away.

Note this macro's documentation:

...
dnl Thus, the question "does the OS have the function func" has three possible
dnl answers:
dnl   - yes, in all versions starting from the given API level,
dnl   - no, in no version,
dnl   - not in the given API level, but in a later version of Android.
...
dnl This macro sets two variables:
dnl   - gl_cv_onwards_func_<func>   to yes / no / "future OS version"
dnl   - ac_cv_func_<func>           to yes / no / no
dnl The first variable allows to distinguish all three cases.
dnl The second variable is set, so that an invocation
dnl   gl_CHECK_FUNCS_ANDROID([func], [[#include <foo.h>]])
dnl can be used as a drop-in replacement for
dnl   AC_CHECK_FUNCS([func]).

Bruno