[igt-dev] [PATCH i-g-t] meson: Make doc building dependent on gtk-doc

[Arkadiusz Hiler]

Currently, when gtk-doc is not installed 'ninja' succeeds but
'ninja install' fails with the following error:

   FileNotFoundError: [Errno 2] No such file or directory: 'gtkdoc-scan': 'gtkdoc-scan'

With this patch 'meson build' will log that documentations would not
build and 'ninja install' will succeed.

When forcing building docs with 'meson -Dbuild_docs=true build' the
following error will occur instead:

  meson.build:323:0: ERROR:  Dependency "gtk-doc" not found, tried pkgconfig and cmake

Cc: Petri Latvala <petri.latvala at intel.com>
Reported-by: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
---
 meson.build | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index 099db897..557400a5 100644
--- a/meson.build
+++ b/meson.build
@@ -320,9 +320,11 @@ endif
 subdir('overlay')
 subdir('man')
 
+gtk_doc = dependency('gtk-doc', required : _docs_required)
+
 docs_info = 'No'
 if _build_docs
-	if _build_tests
+	if _build_tests and gtk_doc.found()
 		subdir('docs')
 		docs_info = 'Yes'
 	elif _docs_required
-- 
2.20.1