ci: add missing dependencies for documentation

Install missing dependencies so that doc can be generated.
While at it, explicitly configure that we want the doc to be generated.
Missing dependencies are then reported as an error rather than silently
ignored.

Because of these extra dependencies, only build them in dedicated travis
jobs.

Fixes: ad2b2cfb1e ("ci: enable unit tests with Travis")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Aaron Conole <aconole@redhat.com>

.ci/linux-build.sh

@@ -19,14 +19,14 @@ if [ "$AARCH64" = "1" ]; then
     OPTS="$OPTS --cross-file config/arm/arm64_armv8_linux_gcc"
 fi
 
+if [ "$BUILD_DOCS" = "1" ]; then
+    OPTS="$OPTS -Denable_docs=true"
+fi
+
 OPTS="$OPTS --default-library=$DEF_LIB"
 meson build --werror -Dexamples=all $OPTS
 ninja -C build
 
-if [ "$BUILD_DOCS" = "1" ]; then
-    ninja -C build doc
-fi
-
 if [ "$RUN_TESTS" = "1" ]; then
     sudo meson test -C build --suite fast-tests -t 3
 fi

.travis.yml

@@ -23,6 +23,9 @@ extra_packages: &extra_packages
   - *required_packages
   - [libbsd-dev, libpcap-dev, libcrypto++-dev, libjansson4]
 
+doc_packages: &doc_packages
+  - [doxygen, graphviz, python3-sphinx]
+
 before_install: ./.ci/${TRAVIS_OS_NAME}-setup.sh
 
 env:
@@ -30,7 +33,7 @@ env:
   - DEF_LIB="shared"
   - DEF_LIB="static" OPTS="-Denable_kmods=false"
   - DEF_LIB="shared" OPTS="-Denable_kmods=false"
-  - DEF_LIB="shared" RUN_TESTS=1 BUILD_DOCS=1
+  - DEF_LIB="shared" RUN_TESTS=1
 
 matrix:
   include:
@@ -58,6 +61,7 @@ matrix:
       apt:
         packages:
           - *extra_packages
+          - *doc_packages
   - env: DEF_LIB="static" OPTS="-Denable_kmods=false" EXTRA_PACKAGES=1
     compiler: gcc
     addons:
@@ -88,6 +92,7 @@ matrix:
       apt:
         packages:
           - *extra_packages
+          - *doc_packages
   - env: DEF_LIB="static" OPTS="-Denable_kmods=false" EXTRA_PACKAGES=1
     compiler: clang
     addons: