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cmake(qt6): verify Qt6::GuiPrivate at configure time, drop #warning

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<private/qpdf_p.h> (QPdfEngine::drawHyperlink) needs Qt's private GUI
module, previously flagged only by a #warning at compile time.

Qt >= 6.7 ships GuiPrivate as a proper find_package component, but some
distro packages (e.g. Ubuntu's qt6-base-private-dev, Qt 6.8.3) do not
install Qt6GuiPrivateConfig.cmake and only provide the implicit
Qt6::GuiPrivate target created alongside Qt6::Gui. Requesting the
component unconditionally would therefore break distro-Qt builds.

Instead: try the component quietly, then hard-verify the Qt6::GuiPrivate
target exists after the main find_package, failing at configure time
with an actionable message if the private headers are missing. The
compile-time #warning in pdf_links.cpp and projectprintwindow.cpp is
now redundant and removed.

Verified: cmake configure + compile of both translation units on
Ubuntu 25.04 / Qt 6.8.3 (system KF6), cmake configure on Qt 5.15.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Shane Ringrose
2026-07-12 22:32:42 +12:00
committed by Andre Rummler
parent c14d6a6dd6
commit 206c37f620
3 changed files with 28 additions and 23 deletions
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sources/pdf_links.cpp
+2 -2
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@@ -23,8 +23,8 @@
#include "qetgraphicsitem/element.h"
#include "qetgraphicsitem/elementtextitemgroup.h"
// Private Qt PDF engine for drawHyperlink() — not public API, stable since Qt4.
// Requires QT += gui-private in qelectrotech.pro / gui-private in CMake.
// Private Qt PDF engine for drawHyperlink() — not public API.
// Availability of Qt::GuiPrivate is verified at configure time in CMakeLists.txt.
#include <private/qpdf_p.h>
#include <QByteArray>