Fix qmake/qtpaths -query for static relocatable builds

The install prefix was determined incorrectly for static relocatable
builds.  The reason was that for those builds, QLibraryInfo::path()
returns the application directory, which is <prefix>/bin for qmake and
qtpaths.

Fix this by removing the bin directory part from the installation prefix
that QLibraryInfo returns if qmake/qtpaths are used.

Fixes: QTBUG-102877
Change-Id: I2e9ff96ded0ee2a7802b265741a3cfbe2bf0a4ba
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

qmake/qmakelibraryinfo.cpp

@@ -169,17 +169,22 @@ static QLibraryInfoPrivate::LocationInfo defaultLocationInfo(int loc)
     return result;
 }
 
+static QString libraryInfoPath(QLibraryInfo::LibraryPath location)
+{
+    return QLibraryInfoPrivate::path(location, QLibraryInfoPrivate::UsedFromQtBinDir);
+}
+
 static QString storedPath(int loc)
 {
     QString result;
     if (loc < QMakeLibraryInfo::FirstHostPath) {
-        result = QLibraryInfo::path(static_cast<QLibraryInfo::LibraryPath>(loc));
+        result = libraryInfoPath(static_cast<QLibraryInfo::LibraryPath>(loc));
     } else if (loc <= QMakeLibraryInfo::LastHostPath) {
         if (loc == QMakeLibraryInfo::HostDataPath) {
             // Handle QT_HOST_DATADIR specially. It is not necessarily equal to QT_INSTALL_DATA.
             result = QT_HOST_DATADIR;
         } else {
-            result = QLibraryInfo::path(hostToTargetPathEnum(loc));
+            result = libraryInfoPath(hostToTargetPathEnum(loc));
         }
     } else if (loc == QMakeLibraryInfo::SysrootPath) {
         // empty result

src/corelib/global/qlibraryinfo.cpp

@@ -369,7 +369,7 @@ static HMODULE getWindowsModuleHandle()
 }
 #endif // Q_OS_WIN
 
-static QString getRelocatablePrefix()
+static QString getRelocatablePrefix(QLibraryInfoPrivate::UsageMode usageMode)
 {
     QString prefixPath;
 
@@ -377,7 +377,14 @@ static QString getRelocatablePrefix()
     // For regular builds, the prefix will be relative to the location of the QtCore shared library.
 #if defined(QT_STATIC)
     prefixPath = prefixFromAppDirHelper();
+    if (usageMode == QLibraryInfoPrivate::UsedFromQtBinDir) {
+        // For Qt tools in a static build, we must chop off the bin directory.
+        constexpr QByteArrayView binDir = qt_configure_strs.viewAt(QLibraryInfo::BinariesPath - 1);
+        constexpr size_t binDirLength = binDir.size() + 1;
+        prefixPath.chop(binDirLength);
+    }
 #elif defined(Q_OS_DARWIN) && QT_CONFIG(framework)
+    Q_UNUSED(usageMode);
 #ifndef QT_LIBINFIX
     #define QT_LIBINFIX ""
 #endif
@@ -416,11 +423,13 @@ static QString getRelocatablePrefix()
 
     prefixPath = QDir::cleanPath(prefixDir);
 #elif QT_CONFIG(dlopen)
+    Q_UNUSED(usageMode);
     Dl_info info;
     int result = dladdr(reinterpret_cast<void *>(&QLibraryInfo::isDebugBuild), &info);
     if (result > 0 && info.dli_fname)
         prefixPath = prefixFromQtCoreLibraryHelper(QString::fromLocal8Bit(info.dli_fname));
 #elif defined(Q_OS_WIN)
+    Q_UNUSED(usageMode);
     HMODULE hModule = getWindowsModuleHandle();
     const int kBufferSize = 4096;
     wchar_t buffer[kBufferSize];
@@ -484,11 +493,12 @@ static QString getRelocatablePrefix()
 }
 #endif
 
-static QString getPrefix()
+static QString getPrefix(QLibraryInfoPrivate::UsageMode usageMode)
 {
 #if QT_CONFIG(relocatable)
-    return getRelocatablePrefix();
+    return getRelocatablePrefix(usageMode);
 #else
+    Q_UNUSED(usageMode);
     return QString::fromLocal8Bit(QT_CONFIGURE_PREFIX_PATH);
 #endif
 }
@@ -555,7 +565,19 @@ QLibraryInfoPrivate::LocationInfo QLibraryInfoPrivate::locationInfo(QLibraryInfo
 */
 QString QLibraryInfo::path(LibraryPath p)
 {
-    const LibraryPath loc = p;
+    return QLibraryInfoPrivate::path(p);
+}
+
+
+/*
+    Returns the path specified by \a p.
+
+    The usage mode can be set to UsedFromQtBinDir to enable special handling for executables that
+    live in <install-prefix>/bin.
+ */
+QString QLibraryInfoPrivate::path(QLibraryInfo::LibraryPath p, UsageMode usageMode)
+{
+    const QLibraryInfo::LibraryPath loc = p;
     QString ret;
     bool fromConf = false;
 #if QT_CONFIG(settings)
@@ -605,12 +627,12 @@ QString QLibraryInfo::path(LibraryPath p)
 #endif // settings
 
     if (!fromConf) {
-        if (loc == PrefixPath) {
+        if (loc == QLibraryInfo::PrefixPath) {
-            ret = getPrefix();
+            ret = getPrefix(usageMode);
         } else if (int(loc) <= qt_configure_strs.count()) {
             ret = QString::fromLocal8Bit(qt_configure_strs.viewAt(loc - 1));
 #ifndef Q_OS_WIN // On Windows we use the registry
-        } else if (loc == SettingsPath) {
+        } else if (loc == QLibraryInfo::SettingsPath) {
             // Use of volatile is a hack to discourage compilers from calling
             // strlen(), in the inlined fromLocal8Bit(const char *)'s body, at
             // compile-time, as Qt installers binary-patch the path, replacing
@@ -623,11 +645,11 @@ QString QLibraryInfo::path(LibraryPath p)
 
     if (!ret.isEmpty() && QDir::isRelativePath(ret)) {
         QString baseDir;
-        if (loc == PrefixPath) {
+        if (loc == QLibraryInfo::PrefixPath) {
             baseDir = prefixFromAppDirHelper();
         } else {
             // we make any other path absolute to the prefix directory
-            baseDir = path(PrefixPath);
+            baseDir = path(QLibraryInfo::PrefixPath, usageMode);
         }
         ret = QDir::cleanPath(baseDir + u'/' + ret);
     }

src/corelib/global/qlibraryinfo_p.h

@@ -79,6 +79,13 @@ public:
     };
 
     static LocationInfo locationInfo(QLibraryInfo::LibraryPath loc);
+
+    enum UsageMode {
+        RegularUsage,
+        UsedFromQtBinDir
+    };
+
+    static QString path(QLibraryInfo::LibraryPath p, UsageMode usageMode = RegularUsage);
 };
 
 QT_END_NAMESPACE