[dpdk-dev] [PATCH 1/2] doc/api: generate dependency file for examples doc

[Bruce Richardson <bruce.richardson@intel.com>]

For the doxygen API for the examples folder, we can generate a build
dependency file when we generate the examples.dox file. This allows
correct rebuilds if the files in examples change.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 doc/api/generate_examples.sh | 4 ++++
 doc/api/meson.build          | 5 ++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/api/generate_examples.sh b/doc/api/generate_examples.sh
index 6fcfe513b..dae7ee0be 100755
--- a/doc/api/generate_examples.sh
+++ b/doc/api/generate_examples.sh
@@ -5,6 +5,10 @@
 EXAMPLES_DIR=$1
 API_EXAMPLES=$2
 
+# generate a .d file including both C files and also build files, so we can
+# detect both file changes and file additions/deletions
+echo "$API_EXAMPLES: $(find ${EXAMPLES_DIR} -type f \( -name '*.c' -o -name 'meson.build' \) -printf '%p ' )" > ${API_EXAMPLES}.d
+
 exec > "${API_EXAMPLES}"
 printf '/**\n'
 printf '@page examples DPDK Example Programs\n\n'
diff --git a/doc/api/meson.build b/doc/api/meson.build
index c72b880e1..899e930fa 100644
--- a/doc/api/meson.build
+++ b/doc/api/meson.build
@@ -15,7 +15,6 @@ generate_doxygen = find_program('generate_doxygen.sh')
 generate_examples = find_program('generate_examples.sh')
 generate_css = find_program('doxy-html-custom.sh')
 
-inputdir = join_paths(meson.source_root(), 'examples')
 htmldir = join_paths('share', 'doc', 'dpdk')
 
 # due to the following bug: https://github.com/mesonbuild/meson/issues/4107
@@ -24,9 +23,9 @@ htmldir = join_paths('share', 'doc', 'dpdk')
 # false it would be impossible to install the docs.
 # So use a configure option for now.
 example = custom_target('examples.dox',
-	input: inputdir,
 	output: 'examples.dox',
-	command: [generate_examples, '@INPUT@', '@OUTPUT@'],
+	command: [generate_examples, join_paths(meson.source_root(), 'examples'), '@OUTPUT@'],
+	depfile: 'examples.dox.d',
 	install: get_option('enable_docs'),
 	install_dir: htmldir,
 	build_by_default: get_option('enable_docs'))
-- 
2.20.1