Downgrade powerpc/Linux/Gnu to Tier 2

Author: Susurrus

.travis.yml

@@ -97,6 +97,9 @@ matrix:
       rust: beta
 
   allow_failures:
+    # There are too many inconsistent failures on this arch to make it Tier 1.
+    - env: TARGET=powerpc-unknown-linux-gnu
+      rust: 1.13.0
     # Planning to add these targets, but they can fail for now
     - env: TARGET=mips64-unknown-linux-gnuabi64
       rust: 1.13.0

README.md

@@ -58,7 +58,6 @@ Tier 1:
   * i686-unknown-linux-musl
   * mips-unknown-linux-gnu
   * mipsel-unknown-linux-gnu
-  * powerpc-unknown-linux-gnu
   * powerpc64-unknown-linux-gnu
   * powerpc64le-unknown-linux-gnu
   * x86_64-apple-darwin
@@ -76,6 +75,7 @@ Tier 2:
   * i386-apple-ios
   * i686-linux-android (requires Rust >= 1.18)
   * i686-unknown-freebsd
+  * powerpc-unknown-linux-gnu
   * x86_64-apple-ios
   * x86_64-linux-android (requires Rust >= 1.18)
   * x86_64-unknown-netbsd