Add config option to build documentation as a two-step process

The new 'prepare_docs' CONFIG option triggers the documentation rules in
default_post to generate two extra targets: prepare_docs and generate_docs.
The prepare_docs stage runs qdoc with the -prepare option, which means qdoc
will only generate index files, and the generate_docs stage will call
qdoc with -generate, which reads the index files and generates the final
output. The regular docs target will then run the prepare_docs target
for all submodules before running the generate_docs target.

This ensures that when generating the final output, qdoc has all the
index files for all the other modules available, to be able to resolve
cross-references between the various Qt modules.

This patch needs a follow-up in qt5.git to add CONFIG+=prepare_docs, so
that the root Qt5 build will be able to hook into this new behavior.

Change-Id: I654d7f0d4d5a41d9be208e6d3a8923bf0194f9ad
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/tools/tools.pro b/src/tools/tools.pro
index c67d6bfd76..f7d1e651ff 100644
--- a/src/tools/tools.pro
+++ b/src/tools/tools.pro
@@ -38,6 +38,6 @@ SUBDIRS = $$TOOLS_SUBDIRS
 # Ensure qdoc is built before making any docs. We rely on the existing dependency
 # on bootstrap for each of the other tools to ensure they also build qdoc first,
 # and likewise, the dependency of the rest of the build on tools, src, etc.
-bootstrap_docs.depends += $${src_tools_qdoc.target}-make_first
-bootstrap_docs.target = $${src_tools_bootstrap.target}-docs
-QMAKE_EXTRA_TARGETS += bootstrap_docs
+bootstrap_prepare_docs.depends += $${src_tools_qdoc.target}-make_first
+bootstrap_prepare_docs.target = $${src_tools_bootstrap.target}-prepare_docs
+QMAKE_EXTRA_TARGETS += bootstrap_prepare_docs