[Toybox] [landley/toybox] Help building toybox with the NDK/bionic (#43)

[enh]

for configure-like usage you'll need to generate a standalone toolchain:

  https://developer.android.com/ndk/guides/standalone_toolchain.html

(you'll also want to use --unified-headers when you generate your
standalone toolchain to get headers new enough to have any chance of
being useful.)



On Sat, Dec 17, 2016 at 12:59 PM, Rob Landley <rob at landley.net> wrote:
> On 12/15/2016 06:16 PM, enh wrote:
>> On Sat, Nov 19, 2016 at 3:20 PM, Rob Landley <rob at landley.net> wrote:
>>> On 11/19/2016 01:54 PM, Elliott Hughes wrote:
>>>> NDK r14 beta 1 should be out next week and includes the unified (aka
>>>> "modern") headers, which will be the first step towards building toybox
>>>> with the NDK.
>>>
>>> Yay!
>>
>> just under a month later (delays caused by Android Studio)... NDK r14
>> beta 1 shipped this week with the unified headers. a standalone
>> toolchain using unified headers would help build toybox with the NDK
>> rather than in the platform.
>
> Let's see, wget
> https://dl.google.com/android/repository/android-ndk-r14-beta1-linux-x86_64.zip
> , extract it, try to build:
>
> CROSS_COMPILE=~/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-
> make
>
> Complains there's no prefixed "cc", so ln -s x86_64-linux-android-gcc
> x86_64-linux-android-cc in appropriate directory and...
>
> ./lib/portability.h:25:22: fatal error: features.h: No such file or
> directory
>  #include <features.h>
>
> Hmmm, bit of a chicken and egg problem trying to figure out which libc
> you're building if there's no features.h to include. (It's not in posix,
> but it's in pretty much everything else...)
>
> Which is odd because find . -name features.h says there are a dozen
> copies of this file, let's see...
>
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> ignoring nonexistent directory
> "/home/landley/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9.x/../../../../x86_64-linux-android/include"
> ignoring duplicate directory
> "/home/landley/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/../../lib/gcc/x86_64-linux-android/4.9.x/include"
> ignoring nonexistent directory
> "/tmp/ca8b1ea984a04012a16bb19760bc0d9a/sysroot/usr/local/include"
> ignoring duplicate directory
> "/home/landley/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/../../lib/gcc/x86_64-linux-android/4.9.x/include-fixed"
> ignoring nonexistent directory
> "/home/landley/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/../../lib/gcc/x86_64-linux-android/4.9.x/../../../../x86_64-linux-android/include"
> ignoring nonexistent directory
> "/tmp/ca8b1ea984a04012a16bb19760bc0d9a/sysroot/usr/include"
> #include "..." search starts here:
> #include <...> search starts here:
>  .
>  /home/landley/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9.x/include
>  /home/landley/android/android-ndk-r14-beta1/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9.x/include-fixed
>
> So it's looking for sysroot/usr/include under /tmp/gianthexcode.
>
>> (libselinux isn't an NDK API and isn't going to be, though, so it
>> would be a cut-down toybox at best unless you start making those
>> things available, at which point you're drifting back to "just build
>> from AOSP" being the sensible choice.)
>
> We'll burn that bridge when we come to it, right now it still can't
> build with this toolchain for me.
>
> Rob



-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.