19b7f854a2
The -mno-direct-extern-access tells the compiler and linker that references to symbols outside this ELF module mustn't be direct and must instead always go through the GOT or PLT (the PLT can additionally be disabled with -fno-plt). The ELF protected visibility tells the compiler and linker that this symbol is present in the dynamic symbol table as an export, but it cannot be interposed by another ELF module. This option is required for user code to link properly to Qt, otherwise they will get linker errors (assuming GNU binutils >= 2.39) or runtime failures (glibc >= 2.35). Both versions of glibc and binutils are older than GCC 12, so it's a safe assumption they are in use and downgrading the toolchain or libc is not supported. Adding this option to the compilation is assured for CMake and qmake-based projects. For example, all accessess to QCoreApplication::self in QtCore, after this change and with GCC 12 are relocation-free and direct: 000000000013ebf0 <QCoreApplicationPrivate::checkInstance(char const*)>: 13ebf0: cmpq $0x0,0x4f73d0(%rip) # 635fc8 <QCoreApplication::self> 13ebf8: setne %al 13ebfb: je a90fe <QCoreApplicationPrivate::checkInstance(char const*) [clone .cold]> 13ec01: ret Meanwhile, accesses to the same variable in other modules are indirect via the GOT: 66650: mov 0x876e1(%rip),%rax # edd38 <QCoreApplication::self@Qt_6> 66657: cmpq $0x0,(%rax) This replaces the -Bsymbolic and -Bsymbolic-functions (broken) functionality that Qt has been using or attempting to use since ~2006. See https://gitlab.com/x86-psABIs/x86-64-ABI/-/issues/8#note_606975128 Change-Id: Iad4b0a3e5c06570b9f5f571b26ed564aa0811e47 Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io> Reviewed-by: Lars Knoll <lars.knoll@qt.io>
369 lines
14 KiB
Plaintext
369 lines
14 KiB
Plaintext
# This avoids spurious errors when a project is explicitly disabled
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# due to required Qt modules being missing.
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!isEmpty(QMAKE_FAILED_REQUIREMENTS): return()
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qtConfig(thread): CONFIG *= thread
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#handle defines
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win32 {
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qtConfig(shared) {
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# this variable is read by qmake in qmake/generators/win32/msvc_vcproj.cpp
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# function VcprojGenerator::initDeploymentTool()
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QMAKE_DLL_PATHS += $$[QT_INSTALL_BINS/get]
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}
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}
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CONFIG(release, debug|release):DEFINES += QT_NO_DEBUG
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no_keywords:DEFINES += QT_NO_KEYWORDS
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plugin { #Qt plugins
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static:DEFINES += QT_STATICPLUGIN
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DEFINES += QT_PLUGIN
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}
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qtestlib {
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warning("CONFIG+=qtestlib is deprecated. Use QT+=testlib instead.")
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QT += testlib
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}
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qdbus {
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warning("CONFIG+=qdbus is deprecated. Use QT+=dbus instead.")
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QT += dbus
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}
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help {
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warning("CONFIG+=help is deprecated. Use QT+=help instead.")
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QT += help-private # sic!
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}
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designer {
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warning("CONFIG+=designer is deprecated. Use QT+=designer instead.")
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QT += designer
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}
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uitools {
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warning("CONFIG+=uitools is deprecated. Use QT+=uitools instead.")
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QT += uitools
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}
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qaxcontainer {
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warning("CONFIG+=qaxcontainer is deprecated. Use QT+=axcontainer instead.")
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QT += axcontainer
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}
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qaxserver {
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warning("CONFIG+=qaxserver is deprecated. Use QT+=axserver instead.")
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QT += axserver
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}
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!import_qpa_plugin {
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warning("CONFIG-=import_qpa_plugin is deprecated. Use QTPLUGIN.platforms=- instead.")
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QTPLUGIN.platforms = -
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} else: qpa_minimal_plugin {
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warning("CONFIG+=qpa_minimal_plugin is deprecated. Use QTPLUGIN.platforms=qminimal instead.")
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QTPLUGIN.platforms = qminimal
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}
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!force_import_plugins:!contains(TEMPLATE, ".*app"):!if(contains(TEMPLATE, ".*lib"):dll): \
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CONFIG -= import_plugins
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unix {
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contains(QT_CONFIG, no_extern_direct_access): CONFIG += mno_extern_direct_access
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else:contains(QT_CONFIG, reduce_relocations):!contains(TEMPLATE, .*lib): {
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QMAKE_CFLAGS += $$QMAKE_CFLAGS_PIC
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QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_PIC
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}
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}
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# qmake variables cannot contain dashes, so normalize the names first
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CLEAN_QT = $$replace(QT, -private$, _private)
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CLEAN_QT_PRIVATE = $$replace(QT_PRIVATE, -private$, _private)
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qt_module_deps = $$CLEAN_QT $$CLEAN_QT_PRIVATE
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all_qt_module_deps = $$resolve_depends(qt_module_deps, "QT.", ".depends" ".run_depends")
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QTPLUGIN = $$unique($$list($$lower($$QTPLUGIN)))
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import_plugins:qtConfig(static) {
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manualplugs = $$QTPLUGIN # User may specify plugins. Mostly legacy.
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autoplugs = # Auto-added plugins.
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# First round: explicitly specified modules.
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plugin_deps = $$all_qt_module_deps
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for(ever) {
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# Automatically link the default plugins for the linked Qt modules.
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for (qtmod, plugin_deps) {
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for (ptype, QT.$${qtmod}.plugin_types) {
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nptype = $$replace(ptype, [-/], _)
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isEmpty(QTPLUGIN.$$nptype) {
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for (plug, QT_PLUGINS) {
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equals(QT_PLUGIN.$${plug}.TYPE, $$ptype) {
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for (dep, QT_PLUGIN.$${plug}.EXTENDS) {
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!contains(all_qt_module_deps, $$dep) {
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plug =
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break()
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}
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}
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autoplugs += $$plug
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}
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}
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} else {
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plug = $$eval(QTPLUGIN.$$nptype)
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!equals(plug, -): \
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autoplugs += $$plug
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}
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}
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}
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QTPLUGIN = $$manualplugs $$autoplugs
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QTPLUGIN = $$unique(QTPLUGIN)
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# Obtain the plugins' Qt dependencies ...
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plugin_deps =
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for (plug, QTPLUGIN): \
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plugin_deps += $$eval(QT_PLUGIN.$${plug}.DEPENDS)
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plugin_deps = $$resolve_depends(plugin_deps, "QT.", ".depends" ".run_depends")
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plugin_deps -= $$all_qt_module_deps
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isEmpty(plugin_deps): \
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break()
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# ... and start over if any new Qt modules appeared,
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# as these may want to load plugins in turn.
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all_qt_module_deps += $$plugin_deps
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}
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extraplugs = $$manualplugs
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manualplugs -= $$autoplugs
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extraplugs -= $$manualplugs
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!isEmpty(extraplugs): \
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warning("Redundant entries in QTPLUGIN: $$extraplugs")
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!isEmpty(QTPLUGIN) {
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IMPORT_FILE_CONT = \
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"// This file is autogenerated by qmake. It imports static plugin classes for" \
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"// static plugins specified using QTPLUGIN and QT_PLUGIN_CLASS.<plugin> variables." \
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"$${LITERAL_HASH}include <QtPlugin>"
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for (plug, QTPLUGIN) {
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plug_class = $$eval(QT_PLUGIN.$${plug}.CLASS_NAME)
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!isEmpty(plug_class): \
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IMPORT_FILE_CONT += "Q_IMPORT_PLUGIN($$plug_class)"
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else: \
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warning("Plugin class name could not be determined for plugin '$$plug'.")
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}
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TARGET_BASENAME = $$lower($$basename(TARGET))
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TARGET_BASENAME ~= s/\s/_/g
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IMPORT_CPP = $$OUT_PWD/$${TARGET_BASENAME}_plugin_import.cpp
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write_file($$IMPORT_CPP, IMPORT_FILE_CONT)|error()
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GENERATED_SOURCES += $$IMPORT_CPP
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QMAKE_DISTCLEAN += $$IMPORT_CPP
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}
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}
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# Only link against plugins in static builds
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!isEmpty(QTPLUGIN):qtConfig(static) {
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for (plug, QTPLUGIN) {
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# Check if the plugin is known to Qt. We can use this to determine
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# the plugin path. Unknown plugins must rely on the default link path.
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plug_type = $$eval(QT_PLUGIN.$${plug}.TYPE)
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!isEmpty(plug_type) {
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plug_name = $$QMAKE_PREFIX_STATICLIB$${plug}$$qtPlatformTargetSuffix().$$QMAKE_EXTENSION_STATICLIB
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plug_path = $$eval(QT_PLUGIN.$${plug}.PATH)
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isEmpty(plug_path): \
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plug_path = $$[QT_INSTALL_PLUGINS/get]
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LIBS += $$plug_path/$$plug_type/$$plug_name
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} else {
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LIBS += -l$${plug}$$qtPlatformTargetSuffix()
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}
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}
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}
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# target variable, flag source variable
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defineTest(qtProcessModuleFlags) {
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for(flag, $$2) {
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contains(flag, ^-.*): \
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$$1 -= $$replace(flag, ^-, )
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else: \
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$$1 += $$flag
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}
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export($$1)
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}
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unset(using_private_headers)
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var_sfx =
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for(ever) {
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# Topological resolution of modules based on their QT.<module>.depends variable
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FULL_QT$$var_sfx = $$resolve_depends(CLEAN_QT$$var_sfx, "QT.")
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# Finally actually add the modules
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unset(BAD_QT)
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for(QTLIB, FULL_QT$$var_sfx) {
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MODULE_NAME = $$eval(QT.$${QTLIB}.name)
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MODULE_MODULE = $$eval(QT.$${QTLIB}.module)
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MODULE_INCLUDES = $$eval(QT.$${QTLIB}.includes)
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MODULE_LDFLAGS = $$eval(QT.$${QTLIB}.ldflags)
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MODULE_LIBS = $$eval(QT.$${QTLIB}.libs)
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MODULE_FRAMEWORKS = $$eval(QT.$${QTLIB}.frameworks)
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MODULE_USES = $$eval(QT.$${QTLIB}.uses)
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MODULE_CONFIG = $$eval(QT.$${QTLIB}.module_config)
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isEmpty(MODULE_NAME) {
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BAD_QT += $$QTLIB
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next()
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}
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contains(MODULE_CONFIG, internal_module):!isEmpty(MODULE_INCLUDES): \
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using_private_headers = true
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contains(MODULE_CONFIG, ltcg): \
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CONFIG += link_ltcg
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qtProcessModuleFlags(CONFIG, QT.$${QTLIB}.CONFIG)
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qtProcessModuleFlags(DEFINES, QT.$${QTLIB}.DEFINES)
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MODULE_INCLUDES -= $$QMAKE_DEFAULT_INCDIRS
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# Add linker flags before lib
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LIBS$$var_sfx += $$MODULE_LDFLAGS
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# Frameworks shouldn't need include paths, but much code does not use
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# module-qualified #includes, so by default we add paths which point
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# directly into the frameworks. Private modules have somewhat convoluted
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# header paths, so adding them is necessary in every case.
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!if(contains(MODULE_CONFIG, lib_bundle):qt_no_framework_direct_includes) \
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|contains(MODULE_CONFIG, internal_module): \
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INCLUDEPATH *= $$MODULE_INCLUDES
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QMAKE_FRAMEWORKPATH *= $$MODULE_FRAMEWORKS
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!isEmpty(MODULE_MODULE) {
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contains(MODULE_CONFIG, lib_bundle) {
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framework = $$MODULE_MODULE
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# Linking frameworks by absolute path does not work.
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LIBS$$var_sfx += -framework $$framework
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} else {
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lib_bases = $$MODULE_MODULE$$qtPlatformTargetSuffix()
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darwin: lib_bases *= $$MODULE_MODULE
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win32|contains(MODULE_CONFIG, staticlib) {
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lib_prefix = $$MODULE_LIBS/$$QMAKE_PREFIX_STATICLIB
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lib_suffixes = $$QMAKE_EXTENSION_STATICLIB
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lib_suffixes *= $$QMAKE_LIB_EXTENSIONS
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add_lib_to_pretargetdeps = true
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} else {
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lib_prefix = $$MODULE_LIBS/$$QMAKE_PREFIX_SHLIB
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lib_suffixes = $$QMAKE_EXTENSION_SHLIB
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add_lib_to_pretargetdeps = false
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}
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candidates =
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for(lib_base, lib_bases) {
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for(lib_suffix, lib_suffixes) {
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candidates += $${lib_prefix}$${lib_base}.$${lib_suffix}
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}
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}
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lib =
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for(candidate, candidates) {
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exists("$$candidate") {
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lib = "$$candidate"
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break()
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}
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}
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isEmpty(lib): \
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lib = $$first(candidates)
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$$add_lib_to_pretargetdeps: \
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PRE_TARGETDEPS += $$lib
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LIBS$$var_sfx += $$lib
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}
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}
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QMAKE_USE$$var_sfx += $$MODULE_USES
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}
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!isEmpty(BAD_QT):error("Unknown module(s) in QT$$var_sfx: $$replace(BAD_QT, _private$, -private)")
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!isEmpty(var_sfx): break()
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var_sfx = _PRIVATE
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}
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!isEmpty(using_private_headers):!no_private_qt_headers_warning:!build_pass {
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message("This project is using private headers and will therefore be tied to this specific Qt module build version.")
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message("Running this project against other versions of the Qt modules may crash at any arbitrary point.")
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message("This is not a bug, but a result of using Qt internals. You have been warned!")
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}
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!no_qt_rpath:!static:qtConfig(rpath):!qtConfig(static):\
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contains(all_qt_module_deps, core) {
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relative_qt_rpath:!isEmpty(QMAKE_REL_RPATH_BASE):contains(INSTALLS, target):\
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isEmpty(target.files):isEmpty(target.commands):isEmpty(target.extra) {
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# NOT the /dev property, as INSTALLS use host paths
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QMAKE_RPATHDIR += $$relative_path($$[QT_INSTALL_LIBS], $$qtRelativeRPathBase())
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} else {
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QMAKE_RPATHDIR += $$[QT_INSTALL_LIBS/dev]
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}
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}
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!isEmpty(QMAKE_LFLAGS_RPATHLINK):!qtConfig(static) {
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# -rpath-link is used by the linker to find dependencies of dynamic
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# libraries which were NOT specified on the command line.
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# This means that paths of direct dependencies (QT & QT_PRIVATE)
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# don't need to be listed, unlike their private dependencies' paths.
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privdep = $$all_qt_module_deps
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privdep -= $$resolve_depends(qt_module_deps, "QT.")
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rpaths =
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for(dep, privdep): \
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rpaths += $$eval(QT.$${dep}.libs)
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QMAKE_RPATHLINKDIR *= $$unique(rpaths)
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}
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# static builds: link qml import plugins into the target.
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contains(all_qt_module_deps, qml): \
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qtConfig(static):import_plugins:!host_build:!no_import_scan {
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exists($$[QT_INSTALL_QML/get]): \
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QMLPATHS *= $$[QT_INSTALL_QML/get]
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# run qmlimportscanner
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qtPrepareLibExecTool(QMLIMPORTSCANNER, qmlimportscanner, , system)
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for (QMLPATH, QMLPATHS): \
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IMPORTPATHS += -importPath $$system_quote($$QMLPATH)
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# add resources to qmlimportscanner
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for (RESOURCE, RESOURCES) {
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defined($${RESOURCE}.files, var) {
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# in case of a "struct", add the struct's files
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base = $$RESOURCE.base
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for (f, $$RESOURCE.files): SCANNERRESOURCES += "$$base/$$f"
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} else {
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# if the resource is a file, just add it
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SCANNERRESOURCES += $$RESOURCE
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}
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}
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!isEmpty(SCANNERRESOURCES) {
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IMPORTPATHS += -qrcFiles
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for (RESOURCE, SCANNERRESOURCES): \
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IMPORTPATHS += $$absolute_path($$system_quote($$RESOURCE), $$_PRO_FILE_PWD_)
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}
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# message(run $$QMLIMPORTSCANNER $$_PRO_FILE_PWD_ $$IMPORTPATHS)
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JSON = $$system($$QMLIMPORTSCANNER $$system_quote($$_PRO_FILE_PWD_) $$IMPORTPATHS)
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parseJson(JSON, IMPORTS)| error("Failed to parse qmlimportscanner output.")
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!isEmpty(IMPORTS._KEYS_) {
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# add import plugins to LIBS line
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for (key, IMPORTS._KEYS_) {
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PATH = $$eval(IMPORTS.$${key}.path)
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PLUGIN = $$eval(IMPORTS.$${key}.plugin)
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!isEmpty(PATH):!isEmpty(PLUGIN): \
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LIBS += $$PATH/$$QMAKE_PREFIX_STATICLIB$${PLUGIN}$$qtPlatformTargetSuffix().$$QMAKE_EXTENSION_STATICLIB
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}
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# create qml_plugin_import.cpp
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IMPORT_FILE_CONT = \
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"// This file is autogenerated by qmake. It imports static plugin classes for" \
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"// static plugins used by QML imports." \
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"$${LITERAL_HASH}include <QtPlugin>"
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for (key, IMPORTS._KEYS_) {
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PLUGIN = $$eval(IMPORTS.$${key}.plugin)
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CLASSNAME = $$eval(IMPORTS.$${key}.classname)
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!isEmpty(PLUGIN) {
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!isEmpty(CLASSNAME) {
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!contains(ADDED_IMPORTS, $$PLUGIN) {
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ADDED_IMPORTS += $$PLUGIN
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IMPORT_FILE_CONT += "Q_IMPORT_PLUGIN($$CLASSNAME)"
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}
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} else {
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error("Plugin $$PLUGIN is missing a classname entry, please add one to the qmldir file.")
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}
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}
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}
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TARGET_BASENAME = $$lower($$basename(TARGET))
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TARGET_BASENAME ~= s/\s/_/g
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QML_IMPORT_CPP = $$OUT_PWD/$${TARGET_BASENAME}_qml_plugin_import.cpp
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write_file($$QML_IMPORT_CPP, IMPORT_FILE_CONT)|error()
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GENERATED_SOURCES += $$QML_IMPORT_CPP
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QMAKE_DISTCLEAN += $$QML_IMPORT_CPP
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}
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}
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