Auto merge of #170 - malbarbo:fix-i686-android, r=japaric

Use -cpu n270 to run i686-linux-android binaries

After the ndk update used to build libstd rust-lang/rust#45580, i686-linux-android binaries stopped working #143. It's seem that the new toolchain is emitting instructions that the default qemu-i386 cpu does not support. Using -cpu n270 (common in android i686 phones), fix the problem.

Fixes #143.

.travis.yml

@@ -31,8 +31,7 @@ matrix:
  - env: TARGET=aarch64-linux-android CPP=1 STD=1 OPENSSL=0.5.5 RUN=1
  - env: TARGET=arm-linux-androideabi CPP=1 STD=1 OPENSSL=0.5.5 RUN=1
  - env: TARGET=armv7-linux-androideabi CPP=1 STD=1 OPENSSL=0.5.5 RUN=1
- # NOTE RUN=1 missing due to issue #143
- - env: TARGET=i686-linux-android CPP=1 STD=1 OPENSSL=0.5.5
+ - env: TARGET=i686-linux-android CPP=1 STD=1 OPENSSL=0.5.5 RUN=1
  - env: TARGET=x86_64-linux-android CPP=1 STD=1 OPENSSL=0.5.5 RUN=1
 
  # OSX

docker/i686-linux-android/Dockerfile

@@ -36,7 +36,7 @@ RUN bash /android-system.sh x86
 # Libz is distributed in the android ndk, but for some unknown reason it is not
 # found in the build process of some crates, so we explicit set the DEP_Z_ROOT
 ENV CARGO_TARGET_I686_LINUX_ANDROID_LINKER=i686-linux-android-gcc \
- CARGO_TARGET_I686_LINUX_ANDROID_RUNNER=qemu-i386 \
+ CARGO_TARGET_I686_LINUX_ANDROID_RUNNER="qemu-i386 -cpu n270" \
  CC_i686_linux_android=i686-linux-android-gcc \
  CXX_i686_linux_android=i686-linux-android-g++ \
  DEP_Z_ROOT=/android-ndk/sysroot/usr/ \