From 8c0fc9264f2aeff045286436cd288c44dae4b2e0 Mon Sep 17 00:00:00 2001
From: Alexandru Croitor <alexandru.croitor@qt.io>
Date: Thu, 26 Mar 2020 14:19:21 +0100
Subject: [PATCH] CMake: Don't generate docs for targets that don't exist

Such a case can happen when cross-compiling. Tools currently are not
built when cross-compiling, so if the desktop tool was not built,
accessing properties on that target would fail when trying to set up
the documentation building.

Change-Id: I2ffcbb9623df3e4daacdf4be3f48c4b2dd13851b
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
---
 cmake/QtBuild.cmake | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cmake/QtBuild.cmake b/cmake/QtBuild.cmake
index dcb1a05634..6c5abb6bc4 100644
--- a/cmake/QtBuild.cmake
+++ b/cmake/QtBuild.cmake
@@ -3579,6 +3579,12 @@ function(qt_add_docs)
     set(target ${ARGV0})
     set(doc_project ${ARGV1})
 
+    # If a target is not built (which can happen for tools when crosscompiling, we shouldn't try
+    # to generate docs.
+    if(NOT TARGET "${target}")
+        return()
+    endif()
+
     if (NOT QT_SUPERBUILD OR QT_WILL_INSTALL)
         set(qdoc_bin "${CMAKE_INSTALL_PREFIX}/${INSTALL_BINDIR}/qdoc")
         set(qtattributionsscanner_bin "${CMAKE_INSTALL_PREFIX}/${INSTALL_BINDIR}/qtattributionsscanner")