Help backtrace-sys find cross objcopy

Author: mattico

.travis.yml

@@ -1,5 +1,6 @@
 sudo: required
 dist: trusty
+language: generic
 services:
   - docker
 

ci/run-docker.sh

@@ -112,7 +112,7 @@ case $TARGET in
     ;;
   powerpc64-*-linux-*)
     OPENSSL_OS=linux-ppc64
-    OPENSSL_CC=powerpc64-linux-gnu-gcc-5
+    OPENSSL_CC=powerpc64-linux-gnu-gcc
     OPENSSL_AR=powerpc64-linux-gnu-ar
     OPENSSL_CFLAGS=-m64
     ;;
@@ -202,4 +202,21 @@ export CARGO_TARGET_DIR=`pwd`/target
 export CARGO_HOME=`pwd`/target/cargo-home
 export CARGO_TARGET_${upper_target}_LINKER=$OPENSSL_CC
 
+# Some targets have trouble finding the cross objcopy for building backtrace-sys.
+# Give them some help.
+case $TARGET in
+  powerpc64-*-linux-*)
+    OBJCOPY=powerpc64-linux-gnu-objcopy
+    ;;
+  mips-*-linux-*)
+    OBJCOPY=mips-linux-gnu-objcopy
+    ;;
+  mipsel-*-linux-*)
+    OBJCOPY=mipsel-linux-gnu-objcopy
+    ;;
+  x86_64-linux-android)
+    OBJCOPY=x86_64-linux-android-objcopy
+    ;;
+esac
+
 exec sh ci/run.sh