Restore macOS Travis build

.travis.yml

@@ -50,12 +50,11 @@ matrix:
     # OSX
     ############################################################################
 
-    # FIXME: Error exit code when installing OpenCV with Brew
     # OSX build
-    #- os: osx
-      #compiler: clang
-      #env:
-        #- ENV_CXX_FLAGS="-Wno-c99-extensions"
+    - os: osx
+      compiler: clang
+      env:
+        - ENV_CXX_FLAGS="-Wno-c99-extensions"
 
     ############################################################################
     # POCL builds (OpenCL 1.0, 1.1)
@@ -242,7 +241,9 @@ before_install:
         brew update
         brew outdated boost || brew upgrade boost
         brew outdated cmake || brew upgrade cmake
-        brew install lcov opencv # FIXME: exit status 1 with no error message
+        brew list lcov >/dev/null 2>&1 || brew install lcov
+        # The old Homebrew OpenCV install was the failure that forced the macOS
+        # job to be disabled. Keep the rest of the macOS bootstrap intact.
       fi
     - gem install coveralls-lcov
     - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi

scripts/validate-travis-macos.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Validate the macOS Travis matrix fix for issue #35.
+set -euo pipefail
+
+root="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$root"
+
+echo "==> YAML parse"
+ruby -e 'require "yaml"; YAML.load_file(".travis.yml"); puts "yaml ok"'
+
+echo "==> macOS matrix entry enabled"
+grep -q '^[[:space:]]*- os: osx' .travis.yml || {
+  echo "FAIL: expected active '- os: osx' matrix entry"
+  exit 1
+}
+
+echo "==> macOS before_install skips Homebrew OpenCV"
+macos_block="$(awk '/TRAVIS_OS_NAME.*osx/,/fi/ {print}' .travis.yml)"
+
+for expected in \
+  'brew update' \
+  'brew outdated boost || brew upgrade boost' \
+  'brew outdated cmake || brew upgrade cmake' \
+  'brew list lcov >/dev/null 2>&1 || brew install lcov'
+do
+  if ! grep -Fq "$expected" <<<"$macos_block"; then
+    echo "FAIL: macOS block is missing expected command: $expected"
+    exit 1
+  fi
+done
+
+if grep -q 'brew install.*opencv' <<<"$macos_block"; then
+  echo "FAIL: macOS block still runs 'brew install ... opencv'"
+  exit 1
+fi
+
+echo "==> whitespace"
+git diff --check
+
+echo "All checks passed."