install newer gcc

.travis.yml

@@ -7,44 +7,21 @@ matrix:
 
     - env: TARGET=thumbv6m-none-eabi
       rust: nightly
-      addons:
-        apt:
-          sources:
-            - debian-sid
-          packages:
-            - binutils-arm-none-eabi
 
     - env: TARGET=thumbv7m-none-eabi
       rust: nightly
-      addons:
-        apt:
-          sources:
-            - debian-sid
-          packages:
-            - binutils-arm-none-eabi
 
     - env: TARGET=thumbv7em-none-eabi
       rust: nightly
-      addons:
-        apt:
-          sources:
-            - debian-sid
-          packages:
-            - binutils-arm-none-eabi
 
     - env: TARGET=thumbv7em-none-eabihf
       rust: nightly
-      addons:
-        apt:
-          sources:
-            - debian-sid
-          packages:
-            - binutils-arm-none-eabi
 
 before_install: set -e
 
 install:
   - bash ci/install.sh
+  - export PATH="$PATH:$PWD/gcc/bin"
 
 script:
   - bash ci/script.sh

ci/install.sh

@@ -4,6 +4,10 @@ main() {
     if [ $TARGET != x86_64-unknown-linux-gnu ]; then
         rustup target add $TARGET
     fi
+
+    mkdir gcc
+
+    curl -L https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2?revision=bc2c96c0-14b5-4bb4-9f18-bceb4050fee7?product=GNU%20Arm%20Embedded%20Toolchain,64-bit,,Linux,7-2018-q2-update | tar --strip-components=1 -C gcc -xj
 }
 
 main