Re: Build a cross compiler for Android target (arm)

[BERTRAND Joel <joel dot bertrand at systella dot fr>]

Jeffrey Walton a écrit :
> On Mon, Oct 17, 2011 at 2:32 AM, Kai Ruottu<kai.ruottu@wippies.com>  wrote:
> > 15.10.2011 12:41, BERTRAND Joel kirjoitti:
> >
> > > I'm trying to build a cross compiler for Android target as I want to
> > > obtain a Fortran compiler.
> > >
> > > Of course, I have installed android ndk to have sysroot.
> > > Build process stops with :
> > >
> > > checking whether the
> > > /home/bertrand/android/ndk/compilers/gcc-build/./gcc/xgcc
> > > -B/home/bertrand/android/ndk/compilers/gcc-build/./gcc/
> > > -B/home/bertrand/android/ndk/compilers/arm-android-eabi/bin/
> > > -B/home/bertrand/android/ndk/compilers/arm-android-eabi/lib/ -isystem
> > > /home/bertrand/android/ndk/compilers/arm-android-eabi/include -isystem
> > > /home/bertrand/android/ndk/compilers/arm-android-eabi/sys-include linker
> > > (/home/bertrand/android/ndk/compilers/gcc-build/./gcc/collect-ld)
> > > supports shared libraries... yes
> > > checking dynamic linker characteristics... no
> > > checking how to hardcode library paths into programs... immediate
> > > checking for shl_load... configure: error: Link tests are not allowed
> > > after GCC_NO_EXECUTABLES.
> > > make[1]: *** [configure-target-libstdc++-v3] Erreur 1
> >
> > Ok, you have the GCC binaries ready (in $build/gcc) and also
> > libgcc (in $build/libgcc) and then your build crashes when
> > trying to configure libstdc++-v3 ... The C parts are OK, but
> > getting the C++ library fails. So what would be the sane
> > reaction in this situation?
> >
> > For me it would be to try to compile and link a simple "Hello
> > World" app with the new GCC... But maybe Android is too weird
> > for this, no experience about whether it even supports simple
> > "console" apps in a terminal window, requiring some really
> > complex application as that "Hello World".
> Google has their own stdc and stdc++, which has some compilation
> problems. Search the Android NDK group
> (http://groups.google.com/group/android-ndk) and the Android Issue
> List (http://code.google.com/p/android/issues/list). See, for example,
> http://code.google.com/p/android/issues/detail?id=14559.

	I have checked into faulty configure script :

...
  case $host_os in
  beos*)
    lt_cv_dlopen="load_add_on"
    lt_cv_dlopen_libs=
    lt_cv_dlopen_self=yes
    ;;

  mingw* | pw32* | cegcc*)
    lt_cv_dlopen="LoadLibrary"
    lt_cv_dlopen_libs=
    ;;

  cygwin*)
    lt_cv_dlopen="dlopen"
    lt_cv_dlopen_libs=
    ;;

  darwin*)
  # if libdl is installed we need to link against it
    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in 
-ldl" >&5
...

  *)
    ac_fn_c_check_func "$LINENO" "shl_load" "ac_cv_func_shl_load"
if test "x$ac_cv_func_shl_load" = x""yes; then :
  lt_cv_dlopen="shl_load"
else
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for shl_load in 
-ldld" >&5
$as_echo_n "checking for shl_load in -ldld... " >&6; }
if test "${ac_cv_lib_dld_shl_load+set}" = set; then :
  $as_echo_n "(cached) " >&6
else
  ac_check_lib_save_LIBS=$LIBS
LIBS="-ldld  $LIBS"
if test x$gcc_no_link = xyes; then
  as_fn_error "Link tests are not allowed after GCC_NO_EXECUTABLES." 
"$LINENO" 5
fi

	If I add :

  eabi*)
    lt_cv_dlopen="dlopen"
    lt_cv_dlopen_libs=
    ;;

make process continues and stops with :

checking for sys/types.h... (cached) yes
checking for unistd.h... (cached) yes
checking for wchar.h... (cached) yes
checking for wctype.h... (cached) yes
configure: error: No support for this host/target combination.
make[1]: *** [configure-target-libstdc++-v3] Erreur 1
make[1]: quittant le répertoire « 
/home/bertrand/android/android-ndk-r6b/compilers/gcc-build »
make: *** [all] Erreur 2

	I have removed to try to build a minimal libstdc++.

  *)
    //as_fn_error "No support for this host/target combination." 
"$LINENO" > 5
   ;;

	But if I can configure with my modifications libstdc++, process hangs 
in libiberty with the same error :

checking for library containing strerror... configure: error: Link tests 
are not allowed after GCC_NO_EXECUTABLES.
make[1]: *** [configure-target-libiberty] Erreur 1

	I think that eabi case are missing in a lot of configure scripts :-(

	Regards,

	JKB