Re: Compiling for Android

[ludo@gnu.org (Ludovic Courtès)]

Hello!

beuc@beuc.net skribis:

> On Fri, Jun 20, 2014 at 12:16:41PM +0200, Ludovic Courtès wrote:
>> beuc@beuc.net skribis:
>> 
>> > Is there anybody working on compiling Guile for Android?
>> 
>> Not that I know of.
>> 
>> > Here are some notes when trying to compile stable-2.0.
>> >
>> > First important note: I had to move "AC_CHECK_LIB(m, cos)" (which btw
>> > could be rewritten at LT_LIB_M()) before gl_INIT in configure.ac,
>> > otherwise libunistring would fail to be detected.
>> 
>> Could you send the config.log of the failing thing?
>
> 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?

>> I wasn’t aware of LT_LIB_M, thanks for the tip.
>> 
>> > The compilation fails when libgc tries to use pthread features not
>> > implemented under Android (btw ./configure was happy to start
>> > compiling even if libgc wasn't present).  Not sure where to go from
>> > here, maybe other projects use libgc and already faced the issue?
>> 
>> Does it work if libgc is configure with --disable-threads?
>
> Not in 7.2 :/
>
> libtool: compile:  arm-linux-androideabi-gcc -DHAVE_CONFIG_H -I./include -I../include -I./libatomic_ops/src -I../libatomic_ops/src -fexceptions -g -O2 -fno-strict-aliasing -MT alloc.lo -MD -MP -MF .deps/alloc.Tpo -c ../alloc.c -o alloc.o
> ../alloc.c: In function 'GC_collect_a_little_inner':
> ../alloc.c:507:5: error: 'PTHREAD_CANCEL_DISABLE' undeclared (first use in this function)

Does it help to configure with --disable-parallel-mark?

>> > 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.

HTH,
Ludo’.