Reduce importance of qtdir option, default to ''.

The qtdir setting took on much less importance with Qt 5.  We've never
officially supported building Qt 5 with kdesrc-build, and qmake and
cmake both use qmake or similar Qt-provided config information to find
Qt, rather than using the unsupported QTDIR environment variable.

As a result, default the value to an empty string (interpreted as use of
system Qt) and stop adding it automatically to the environment variables
defined during the build.  If set, it will continue to be used for now.

This also helps the environment setup driver detect when it should look
for the system Qt5 qmake.

doc/index.docbook

@@ -2450,11 +2450,8 @@ installs the module.
 <entry>qtdir</entry>
 <entry>Module setting overrides global</entry>
 <entry>Set this option to set the environment variable <envar>QTDIR</envar> while building.
-You cannot override this setting in a module option. If you do not specify
-this option, it defaults to
-<filename class="directory"><symbol>${source-dir}</symbol>/build/qt</filename>,
-which uses the qt module included in the &kde; source repository.
-You may use a tilde (~) to represent your home directory.
+If you do not specify this option, &kdesrc-build; will assume that &Qt; is
+provided by the operating system.
 </entry>
 </row>
 

kdesrc-build-setup

@@ -324,9 +324,9 @@ print $output <<EOF;
     # once. 'kf5-qt5' is the latest KF5 and Qt5-based software.
     branch-group kf5-qt5
 
-    # The path to your Qt installation.
-    qtdir ~/qt5
-#   qtdir /usr # If system Qt
+    # The path to your Qt installation (default is empty, assumes Qt provided
+    # by system)
+#   qtdir ~/qt5
 
     # Install directory for KDE software
     kdedir $installDir

kdesrc-buildrc-kf5-sample

@@ -7,7 +7,8 @@
 global
     branch-group kf5-qt5
     kdedir ~/kde-5 # Where to install KF5-based software
-    qtdir /usr     # Where to find Qt5
+    # Uncomment this and edit value to choose a different Qt5
+#    qtdir /usr     # Where to find Qt5
 
     # Where to download source code. By default the build directory and
     # logs will be kept under this directory as well.

kdesrc-buildrc-sample

@@ -24,10 +24,8 @@ global
 #
 # This is the Qt installation to use for building/using KDE. The default is
 # to build Qt (see the qt module below). If you wish to use your system's
-# installed Qt (assuming it is recent enough!) then you can set this to the
-# path to your Qt installation. To find the path to your system's Qt, run
-# "qmake -v". Qt will be installed to the path reported (do not include /lib)
-	qtdir ~/qt4  # Default to installing Qt
+# installed Qt (assuming it is recent enough!) then you can leave this unset.
+#	qtdir ~/qt4  # Default to installing Qt
 
 # By default, each source code module is checked out from its latest
 # development version ('master' for git, 'trunk' for subversion).

modules/ksb/Application.pm

@@ -2260,7 +2260,7 @@ sub _installTemplatedFile
                 \s*%>     # remaining whitespace and closing bracket
               }
               {
-                  $ctx->getOption($1, 'module') ||
+                  $ctx->getOption($1, 'module') //
                       croak_runtime("Invalid variable $1")
               }gxe;
               # Replace all matching expressions, use extended regexp w/

modules/ksb/BuildContext.pm

@@ -112,7 +112,7 @@ our %defaultGlobalOptions = (
     "override-build-system"=> "",
     "override-url"         => "",
     "persistent-data-file" => "",
-    "qtdir"                => "$ENV{HOME}/qt4",
+    "qtdir"                => "",
     "remove-after-install" => "none", # { none, builddir, all }
     "source-dir"           => "$ENV{HOME}/kdesrc",
     "svn-server"           => "svn://anonsvn.kde.org/home/kde",

modules/ksb/BuildSystem/Qt4.pm

@@ -49,6 +49,12 @@ sub configureInternal
 
     my $prefix = $module->getOption('qtdir');
 
+    if (!$prefix)
+    {
+        error ("\tThe b[qtdir] option must be set to determine where to install r[b[$module]");
+        return 0;
+    }
+
     # Some users have added -prefix manually to their flags, they
     # probably shouldn't anymore. :)
 

modules/ksb/Module.pm

@@ -647,31 +647,23 @@ sub setupEnvironment
     my $self = assert_isa(shift, 'ksb::Module');
     my $ctx = $self->buildContext();
     my $kdedir = $self->getOption('kdedir');
-    my $qtdir = $self->getOption('qtdir');
     my $prefix = $self->installationPath();
 
-    # Add global set-envs
+    # Add global set-envs and context
     $self->buildContext()->applyUserEnvironment();
 
-    # Add some standard directories for pkg-config support.  Include env settings.
-    my @pkg_config_dirs = ("$kdedir/lib/pkgconfig", "$qtdir/lib/pkgconfig");
+    my @pkg_config_dirs = ("$kdedir/lib/pkgconfig");
     $ctx->prependEnvironmentValue('PKG_CONFIG_PATH', @pkg_config_dirs);
 
-    # Likewise, add standard directories that should be in LD_LIBRARY_PATH.
-    my @ld_dirs = ("$kdedir/lib", "$qtdir/lib", $self->getOption('libpath'));
+    my @ld_dirs = ("$kdedir/lib", $self->getOption('libpath'));
     $ctx->prependEnvironmentValue('LD_LIBRARY_PATH', @ld_dirs);
 
-    my $buildSystem = $self->buildSystem();
-    $buildSystem->prepareModuleBuildEnvironment($ctx, $self, $prefix);
-
-    my @path = ("$kdedir/bin", "$qtdir/bin", $self->getOption('binpath'));
+    my @path = ("$kdedir/bin", $self->getOption('binpath'));
     $ctx->prependEnvironmentValue('PATH', @path);
 
-    # Set up the children's environment.  We use queueEnvironmentVariable since
-    # it won't set an environment variable to nothing.  (e.g, setting QTDIR to
-    # a blank string might confuse Qt or KDE.
-
-    $ctx->queueEnvironmentVariable('QTDIR', $qtdir);
+    # Build system's environment injection
+    my $buildSystem = $self->buildSystem();
+    $buildSystem->prepareModuleBuildEnvironment($ctx, $self, $prefix);
 
     # Read in user environment defines
     $self->applyUserEnvironment() unless $self == $ctx;