Re: Compiling for Android

[ludo@gnu.org (Ludovic Courtès)]

beuc@beuc.net skribis:

> On Sat, Jun 21, 2014 at 11:34:18PM +0200, Ludovic Courtès wrote:
>> beuc@beuc.net skribis:
>> > Selected bits:
>> >
>> >   configure:14688: checking for libunistring
>> >   configure:14710: arm-linux-androideabi-gcc -o conftest -g -O2 -I/usr/src/ndk-standalone-12/sysroot/usr/include  conftest.c /usr/src/ndk-standalone-12/sysroot/usr/lib/libunistring.so -Wl,-rpath -Wl,/usr/src/ndk-standalone-12/sysroot/usr/lib  >&5
>> >   /usr/src/ndk-standalone-12/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /usr/src/ndk-standalone-12/sysroot/usr/lib/libunistring.so: error: undefined reference to 'frexp'
>> >   collect2: ld returned 1 exit status
>> 
>> It looks like a libunistring issue no?  Namely, libunistring assumed
>> frexp to be available in libc, and it isn’t.
>> 
>> Does Bionic provide that function in libm or something?

[...]

> You're right that it's an issue in libunistring, and I'm surprised it
> doesn't show up in GNU/Linux.

Because in glibc frexp is part of libc.so, not libm.so.

>> >> > Which version of libgc do you recommend?
>> >> 
>> >> 7.4.0 should be good.
>> >
>> > Hmmm, the one that requires yet another dependency (libatomic)? T-T
>> 
>> It’s just a part of libgc that has been separated.
>
> Yeah but deps are painful when you manually recompile them one by one ;)
> Anyway, I bit the bullet and installed v2.4.2 which compiles fine!
>
>
> Another issue: ./configure went well but I wasn't told iconv.h was
> required:
> ../../libguile/print.c:27:19: fatal error: iconv.h: No such file or directory

Hmm, could you run “grep -i 'iconv.h' config.log”?  There is a check for
that, and normally Gnulib provides a replacement if needed.

Apparently lib/iconv.h doesn’t exist here, right?

> There's also an issue in libffi.pc where a '(libdir)' is copied
> verbatim in LIBS, causing bash error at link time, which I hand-fixed
> for now.

What does libffi.pc look like?

> In the end, I got a classical Android issue:
>     CCLD     guile
>   /usr/src/ndk-standalone-12-arm/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./.libs/libguile-2.0.a(libguile_2.0_la-threads.o): in function scm_cancel_thread:../../libguile/threads.c:1175: error: undefined reference to 'pthread_cancel'
>
> ... classical because Bionic intentionally doesn't implement this function.

You could either comment out the related code in libguile, or build
Guile --without-threads.

Is the rest of pthreads implemented?  If yes, then we should add a test
for pthread_cancel and arrange for that.

Thanks,
Ludo’.