Use Core library for qmake instead of the Bootstrap library

Move the qmake-specific logic of the QLibraryInfo class to
qmake internals. 'qconfig.cpp.in' now stores information about
the library info entries to keep them consistent between qmake
and the Core library. qmake requires specific features enabled
in the Core library, so building qmake will be skipped if the
features are not enabled.

All flags directly related to the qmake have been removed from
Core lib.

Remove all bootstrap related sections from qmake CMakeLists.txt

Task-number: QTBUG-89369
Change-Id: I26de157d3bfd4a5526699296e9d46e1c180b89ae
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

1 files changed, 313 insertions, 0 deletions

diff --git a/qmake/qmakelibraryinfo.cpp b/qmake/qmakelibraryinfo.cpp
new file mode 100644
index 0000000000..581d1ad086
--- /dev/null
+++ b/qmake/qmakelibraryinfo.cpp
@@ -0,0 +1,313 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Copyright (C) 2016 Intel Corporation.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmakelibraryinfo.h"
+
+#include <qdir.h>
+#include <qfile.h>
+#include <qglobalstatic.h>
+#include <qsettings.h>
+#include <qscopedpointer.h>
+#include <qstringlist.h>
+
+#include <qmakeconfig.cpp>
+
+QT_BEGIN_NAMESPACE
+
+// qmake_libraryInfoFile and qmake_abslocation are defined in option.cpp
+QString qmake_libraryInfoFile();
+QString qmake_abslocation();
+
+struct QMakeLibrarySettings
+{
+    QMakeLibrarySettings() { load(); }
+
+    void load();
+
+    QScopedPointer<QSettings> settings;
+    bool haveDevicePaths;
+    bool haveEffectiveSourcePaths;
+    bool haveEffectivePaths;
+    bool havePaths;
+    bool reloadOnQAppAvailable;
+};
+Q_GLOBAL_STATIC(QMakeLibrarySettings, qmake_library_settings)
+
+QSettings *QMakeLibraryInfo::findConfiguration()
+{
+    QString qtconfig = qmake_libraryInfoFile();
+    if (!qtconfig.isEmpty())
+        return new QSettings(qtconfig, QSettings::IniFormat);
+    return nullptr; // no luck
+}
+
+QSettings *QMakeLibraryInfo::configuration()
+{
+    QMakeLibrarySettings *ls = qmake_library_settings();
+    return ls ? ls->settings.data() : nullptr;
+}
+
+void QMakeLibraryInfo::reload()
+{
+    if (qmake_library_settings.exists())
+        qmake_library_settings->load();
+}
+
+bool QMakeLibraryInfo::haveGroup(PathGroup group)
+{
+    QMakeLibrarySettings *ls = qmake_library_settings();
+    return ls
+            && (group == EffectiveSourcePaths     ? ls->haveEffectiveSourcePaths
+                        : group == EffectivePaths ? ls->haveEffectivePaths
+                        : group == DevicePaths    ? ls->haveDevicePaths
+                                                  : ls->havePaths);
+}
+
+void QMakeLibrarySettings::load()
+{
+    settings.reset(QMakeLibraryInfo::findConfiguration());
+    if (settings) {
+        QStringList children = settings->childGroups();
+        haveDevicePaths = children.contains(QLatin1String("DevicePaths"));
+        haveEffectiveSourcePaths = children.contains(QLatin1String("EffectiveSourcePaths"));
+        haveEffectivePaths =
+                haveEffectiveSourcePaths || children.contains(QLatin1String("EffectivePaths"));
+        // Backwards compat: an existing but empty file is claimed to contain the Paths section.
+        havePaths = (!haveDevicePaths && !haveEffectivePaths
+                     && !children.contains(QLatin1String(platformsSection)))
+                || children.contains(QLatin1String("Paths"));
+    } else {
+        haveDevicePaths = false;
+        haveEffectiveSourcePaths = false;
+        haveEffectivePaths = false;
+        havePaths = false;
+    }
+}
+
+void QMakeLibraryInfo::sysrootify(QString &path)
+{
+    // Acceptable values for SysrootifyPrefixPath are "true" and "false"
+    if (!QVariant::fromValue(rawLocation(SysrootifyPrefixPath, FinalPaths)).toBool())
+        return;
+
+    const QString sysroot = rawLocation(SysrootPath, FinalPaths);
+    if (sysroot.isEmpty())
+        return;
+
+    if (path.length() > 2 && path.at(1) == QLatin1Char(':')
+        && (path.at(2) == QLatin1Char('/') || path.at(2) == QLatin1Char('\\'))) {
+        path.replace(0, 2, sysroot); // Strip out the drive on Windows targets
+    } else {
+        path.prepend(sysroot);
+    }
+}
+
+static QString getPrefixFromHostBinDir(const char *hostBinDirToPrefixPath)
+{
+    const QString canonicalQMakePath = QFileInfo(qmake_abslocation()).canonicalPath();
+    return QDir::cleanPath(canonicalQMakePath + QLatin1Char('/')
+                           + QLatin1String(hostBinDirToPrefixPath));
+}
+
+static QString getExtPrefixFromHostBinDir()
+{
+    return getPrefixFromHostBinDir(QT_CONFIGURE_HOSTBINDIR_TO_EXTPREFIX_PATH);
+}
+
+static QString getHostPrefixFromHostBinDir()
+{
+    return getPrefixFromHostBinDir(QT_CONFIGURE_HOSTBINDIR_TO_HOSTPREFIX_PATH);
+}
+
+static QString getPrefix(QMakeLibraryInfo::PathGroup group)
+{
+#if QT_CONFIGURE_CROSSBUILD
+    if (group == QMakeLibraryInfo::DevicePaths)
+        return QString::fromLocal8Bit(QT_CONFIGURE_PREFIX_PATH);
+#else
+    Q_UNUSED(group);
+#endif
+    return getExtPrefixFromHostBinDir();
+}
+
+QString QMakeLibraryInfo::path(int loc)
+{
+    QString ret = rawLocation(loc, QMakeLibraryInfo::FinalPaths);
+
+    // Automatically prepend the sysroot to target paths
+    if (loc < QMakeLibraryInfo::SysrootPath || loc > QMakeLibraryInfo::LastHostPath)
+        sysrootify(ret);
+
+    return ret;
+}
+
+QString QMakeLibraryInfo::rawLocation(int loc, QMakeLibraryInfo::PathGroup group)
+{
+    QString ret;
+    bool fromConf = false;
+    // Logic for choosing the right data source: if EffectivePaths are requested
+    // and qt.conf with that section is present, use it, otherwise fall back to
+    // FinalPaths. For FinalPaths, use qt.conf if present and contains not only
+    // [EffectivePaths], otherwise fall back to builtins.
+    // EffectiveSourcePaths falls back to EffectivePaths.
+    // DevicePaths falls back to FinalPaths.
+    PathGroup orig_group = group;
+    if (QMakeLibraryInfo::haveGroup(group)
+        || (group == EffectiveSourcePaths
+            && (group = EffectivePaths, QMakeLibraryInfo::haveGroup(group)))
+        || ((group == EffectivePaths || group == DevicePaths)
+            && (group = FinalPaths, QMakeLibraryInfo::haveGroup(group)))
+        || (group = orig_group, false)) {
+        fromConf = true;
+
+        QString key;
+        QString defaultValue;
+        if (unsigned(loc) < sizeof(qtConfEntries) / sizeof(qtConfEntries[0])) {
+            key = QLatin1String(qtConfEntries[loc].key);
+            defaultValue = QLatin1String(qtConfEntries[loc].value);
+        }
+#ifndef Q_OS_WIN // On Windows we use the registry
+        else if (loc == QLibraryInfo::SettingsPath) {
+            key = QLatin1String("Settings");
+            defaultValue = QLatin1String(".");
+        }
+#endif
+        if (!key.isNull()) {
+            QSettings *config = QMakeLibraryInfo::configuration();
+            config->beginGroup(QLatin1String(group == DevicePaths ? "DevicePaths"
+                                                     : group == EffectiveSourcePaths
+                                                     ? "EffectiveSourcePaths"
+                                                     : group == EffectivePaths ? "EffectivePaths"
+                                                                               : "Paths"));
+
+            ret = config->value(key, defaultValue).toString();
+
+            if (ret.isEmpty()) {
+                if (loc == HostPrefixPath)
+                    ret = config->value(QLatin1String(qtConfEntries[QLibraryInfo::PrefixPath].key),
+                                        QLatin1String(
+                                                qtConfEntries[QLibraryInfo::PrefixPath].value))
+                                  .toString();
+                else if (loc == TargetSpecPath || loc == HostSpecPath
+                         || loc == SysrootifyPrefixPath)
+                    fromConf = false;
+                // The last case here is SysrootPath, which can be legitimately empty.
+                // All other keys have non-empty fallbacks to start with.
+            }
+
+            // TODO: Might be replaced by common for qmake and qtcore function
+            int startIndex = 0;
+            forever {
+                startIndex = ret.indexOf(QLatin1Char('$'), startIndex);
+                if (startIndex < 0)
+                    break;
+                if (ret.length() < startIndex + 3)
+                    break;
+                if (ret.at(startIndex + 1) != QLatin1Char('(')) {
+                    startIndex++;
+                    continue;
+                }
+                int endIndex = ret.indexOf(QLatin1Char(')'), startIndex + 2);
+                if (endIndex < 0)
+                    break;
+                auto envVarName =
+                        QStringView { ret }.mid(startIndex + 2, endIndex - startIndex - 2);
+                QString value =
+                        QString::fromLocal8Bit(qgetenv(envVarName.toLocal8Bit().constData()));
+                ret.replace(startIndex, endIndex - startIndex + 1, value);
+                startIndex += value.length();
+            }
+            config->endGroup();
+
+            ret = QDir::fromNativeSeparators(ret);
+        }
+    }
+
+    if (!fromConf) {
+        // "volatile" here is a hack to prevent compilers from doing a
+        // compile-time strlen() on "path". The issue is that Qt installers
+        // will binary-patch the Qt installation paths -- in such scenarios, Qt
+        // will be built with a dummy path, thus the compile-time result of
+        // strlen is meaningless.
+        const char *volatile path = nullptr;
+        if (loc == QLibraryInfo::PrefixPath) {
+            ret = getPrefix(group);
+        } else if (unsigned(loc)
+                   <= sizeof(qt_configure_str_offsets) / sizeof(qt_configure_str_offsets[0])) {
+            path = qt_configure_strs + qt_configure_str_offsets[loc - 1];
+#ifndef Q_OS_WIN // On Windows we use the registry
+        } else if (loc == QLibraryInfo::SettingsPath) {
+            path = QT_CONFIGURE_SETTINGS_PATH;
+#endif
+        } else if (loc == HostPrefixPath) {
+            static const QByteArray hostPrefixPath = getHostPrefixFromHostBinDir().toLatin1();
+            path = hostPrefixPath.constData();
+        }
+
+        if (path)
+            ret = QString::fromLocal8Bit(path);
+    }
+
+    // These values aren't actually paths and thus need to be returned verbatim.
+    if (loc == TargetSpecPath || loc == HostSpecPath || loc == SysrootifyPrefixPath)
+        return ret;
+
+    if (!ret.isEmpty() && QDir::isRelativePath(ret)) {
+        QString baseDir;
+        if (loc == HostPrefixPath || loc == QLibraryInfo::PrefixPath || loc == SysrootPath) {
+            // We make the prefix/sysroot path absolute to the executable's directory.
+            // loc == PrefixPath while a sysroot is set would make no sense here.
+            // loc == SysrootPath only makes sense if qmake lives inside the sysroot itself.
+            baseDir = QFileInfo(qmake_libraryInfoFile()).absolutePath();
+        } else if (loc > SysrootPath && loc <= LastHostPath) {
+            // We make any other host path absolute to the host prefix directory.
+            baseDir = rawLocation(HostPrefixPath, group);
+        } else {
+            // we make any other path absolute to the prefix directory
+            baseDir = rawLocation(QLibraryInfo::PrefixPath, group);
+            if (group == EffectivePaths)
+                sysrootify(baseDir);
+        }
+        ret = QDir::cleanPath(baseDir + QLatin1Char('/') + ret);
+    }
+    return ret;
+}
+
+QT_END_NAMESPACE