Added an ARM cross-compile build to Travis.

TESTING

.travis.yml

@@ -17,18 +17,18 @@ env:
   # More configurations are configured in the matrix section
   matrix:
     - CONFIG=normal
-    - CONFIG=c90
-    - CONFIG=stackprotect
+#    - CONFIG=c90
+#    - CONFIG=stackprotect
   global:
     - MAKEFLAGS='-j 2'
 
 compiler:
-  - clang
+#  - clang
   - gcc
 
 os:
   - linux
-  - osx
+   #  - osx
 
 matrix:
   include:
@@ -55,6 +55,16 @@ matrix:
     compiler: gcc
     env:
       - CONFIG=gcc8
+  - os: linux
+    addons:
+      apt:
+        packages:
+          - autopoint
+          - gcc-4.8-arm-linux-gnueabihf
+          - libc6-dev-armhf-cross
+    compiler: gcc
+    env:
+      - CONFIG=arm-cross
   - os: linux
     addons:
       apt:
@@ -118,13 +128,17 @@ script:
   - if [ "$CONFIG" = "c90" ] ; then CFLAGS='-std=iso9899:1990 -D_XOPEN_SOURCE=500 -Wall -Wextra -O3'; fi
   - if [ "$CONFIG" = "stackprotect" ] ; then CFLAGS='-g -O0 -fstack-protector-all'; fi
   - if [ "$CONFIG" = "clang6" ] ; then CFLAGS='-Wall -Wextra -O3'; export CC=clang-6.0; fi
-  - if [ "$CONFIG" = "gcc8" ] ; then CFLAGS='-Wall -Wextra -O3'; export export CC=gcc-8; fi
+  - if [ "$CONFIG" = "gcc8" ] ; then CFLAGS='-Wall -Wextra -O3'; export CC=gcc-8; fi
+  - if [ "$CONFIG" = "arm-cross" ] ; then CFLAGS='-Wall -Wextra -O3'; export CC=arm-linux-gnueabihf-gcc-4.8; CONFIGURE_OPTS='--host=arm-linux-gnueabihf'; fi
   - if [ "$CONFIG" = "sanitize" ] ; then CFLAGS='-g -Wall -Wextra -fsanitize=address -fsanitize=undefined'; export CC=clang-6.0; fi
   - if [ "$CONFIG" = "coverage" ] ; then cd "$HOME"/libexif-testsuite; CFLAGS=--coverage; CONFIGURE_OPTS="LDFLAGS=--coverage --with-failmalloc=$HOME/failmalloc/lib" ; fi
   - ./configure --prefix="${HOME}"/install CFLAGS="$CFLAGS" $CONFIGURE_OPTS || { tail -300 config.log; false; }
+
   - make V=1
-  - make V=1 check || { tail -300 test*/test-suite.log; false; }
+  # Skip tests when cross compiling.
+  - if [ "$CONFIG" != "arm-cross" ] ; then make V=1 check || { tail -300 test*/test-suite.log; false; }; fi
   - make V=1 install
+
   - if [ "$CONFIG" = "coverage" ] ; then cd "$TRAVIS_BUILD_DIR"; fi
 
 after_success: