From 23945d2e3f4f450da11ba928707d85f714781db3 Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dziegelmeier@de.pepperl-fuchs.com>
Date: Thu, 18 Oct 2018 10:58:29 +0200
Subject: [PATCH] Try to build documentation on travis, too

---
 .travis.yml    |  1 +
 CMakeLists.txt |  4 +++-
 travis.sh      | 14 +++++++++++++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 2411e588..6295b980 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -35,6 +35,7 @@ addons:
       - check
       - libsubunit-dev
       - ninja-build
+      - doxygen
 
 before_install:
   # Install cmake
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 74c91aa6..71b57f11 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,4 +28,6 @@ include(CPack)
 # Generate docs before creating source package
 include(src/Filelists.cmake)
 add_custom_target(dist COMMAND ${CMAKE_MAKE_PROGRAM} package_source)
-add_dependencies(dist lwipdocs)
+if (TARGET lwipdocs)
+  add_dependencies(dist lwipdocs)
+endif()
diff --git a/travis.sh b/travis.sh
index 41effd9f..fc74714a 100755
--- a/travis.sh
+++ b/travis.sh
@@ -25,7 +25,19 @@ cd build
 # Build CMake
 ERR=$?
 if [ $ERR != 0 ]; then
-       echo "cmake build failed"
+       echo "cmake GENERATE failed"
        exit 33
 fi
 /usr/local/bin/cmake --build . -- -j 4
+ERR=$?
+if [ $ERR != 0 ]; then
+       echo "cmake build failed"
+       exit 33
+fi
+
+/usr/local/bin/cmake --build . --target lwipdocs
+ERR=$?
+if [ $ERR != 0 ]; then
+       echo "lwIP documentation failed"
+       exit 33
+fi