Add codecov coverage (#532)

.ci/coverage.sh

@@ -0,0 +1,7 @@
+#! /bin/bash
+set -e
+lcov --directory bin.v2 --capture --no-external --directory $(pwd) --output-file coverage.info > /dev/null 2>&1
+lcov --extract coverage.info $(pwd)'/boost/gil/*' --output-file coverage.info > /dev/null
+lcov --list coverage.info
+cd libs/gil
+bash <(curl -s https://codecov.io/bash) -f ../../coverage.info || echo "Codecov did not collect coverage reports"

.travis.yml

@@ -20,6 +20,22 @@ matrix:
   exclude:
     - env: BOGUS_JOB=true
   include:
+    - os: linux
+      env: COMPILER=g++-6 VARIANT=debug TOOLSET=gcc CXXSTD=11 B2_OPTIONS="coverage=on"
+      addons:
+        apt:
+          packages:
+            - g++-6
+            - libpng-dev
+            - libjpeg-dev
+            - libtiff5-dev
+            - libraw-dev
+            - lcov
+          sources:
+            - ubuntu-toolchain-r-test
+      after_success:
+        - bash libs/gil/.ci/coverage.sh
+
     - os: linux
       env: COMPILER=g++-5 VARIANT=debug TOOLSET=gcc CXXSTD=11 TEST_HEADERS=1
       addons: