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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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CMakeLists.txt
+16 -15
View File
@@ -70,26 +70,27 @@ find_package(
${QET_COMPONENTS}
REQUIRED)
# Qt6 only creates the Qt::GuiPrivate target (used for QPdfEngine::drawHyperlink)
# when the GuiPrivate component is explicitly requested. Qt5 has no such
# component package and creates the target implicitly with Gui, so only
# request it on Qt6 - requesting it on Qt5 fails the whole configure.
# <private/qpdf_p.h> (QPdfEngine::drawHyperlink) needs Qt's private GUI module.
# Qt >= 6.7 ships it as a proper find_package component, but some distro
# packages (e.g. Ubuntu's qt6-base-private-dev) omit Qt6GuiPrivateConfig.cmake
# and only provide the implicit Qt6::GuiPrivate target created alongside
# Qt6::Gui. Try the component quietly, then verify the target below so a
# missing private-headers package fails here instead of at compile time.
# Qt5 has no such component — its GuiPrivate target always exists once Gui is found.
if(QT_VERSION_MAJOR GREATER_EQUAL 6)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS GuiPrivate)
find_package(Qt6 QUIET COMPONENTS GuiPrivate)
endif()
if(QT_VERSION_MAJOR GREATER_EQUAL 6 AND NOT TARGET Qt6::GuiPrivate)
message(FATAL_ERROR
"Qt6::GuiPrivate was not found. It is required for PDF hyperlink "
"support (<private/qpdf_p.h>). Install the Qt6 private headers "
"(e.g. 'qt6-base-private-dev' on Debian/Ubuntu) or use a Qt build "
"that provides the GuiPrivate component.")
endif()
find_package(SQLite3 REQUIRED)
# CMake < 4.3 only creates the SQLite::SQLite3 target (no SQLite3::SQLite3
# alias yet), while CMake >= 4.3's bundled FindSQLite3 creates SQLite3::SQLite3
# and deprecates the old name. Add the missing alias ourselves so we can use
# the modern target name everywhere regardless of the CMake version in use
# (this project must keep building on CMake versions below 4.3, e.g. on most
# current Linux distros).
if(NOT TARGET SQLite3::SQLite3 AND TARGET SQLite::SQLite3)
add_library(SQLite3::SQLite3 ALIAS SQLite::SQLite3)
endif()
set(CMAKE_AUTOUIC_SEARCH_PATHS ${QET_DIR}/sources/ui)
if(QT_VERSION_MAJOR EQUAL 6)