qmake: Preserve last modification timestamps of installed directories

sync-up with qmake; no effect on creator.

Change-Id: Id5931a467196d5cd67acfa0deffc2488af8a3669
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
(cherry picked from qtbase/c12b96daf2195c475c086f8f9be833aa0e28b26c)
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

2 files changed, 39 insertions, 0 deletions

diff --git a/src/shared/proparser/ioutils.cpp b/src/shared/proparser/ioutils.cpp
index c0bbbe768a..552df764c3 100644
--- a/src/shared/proparser/ioutils.cpp
+++ b/src/shared/proparser/ioutils.cpp
@@ -249,6 +249,42 @@ bool IoUtils::touchFile(const QString &targetFileName, const QString &referenceF
 #  endif
     return true;
 }
+
+#if defined(QT_BUILD_QMAKE) && defined(Q_OS_UNIX)
+bool IoUtils::readLinkTarget(const QString &symlinkPath, QString *target)
+{
+    const QByteArray localSymlinkPath = QFile::encodeName(symlinkPath);
+#  if defined(__GLIBC__) && !defined(PATH_MAX)
+#    define PATH_CHUNK_SIZE 256
+    char *s = 0;
+    int len = -1;
+    int size = PATH_CHUNK_SIZE;
+
+    forever {
+        s = (char *)::realloc(s, size);
+        len = ::readlink(localSymlinkPath.constData(), s, size);
+        if (len < 0) {
+            ::free(s);
+            break;
+        }
+        if (len < size)
+            break;
+        size *= 2;
+    }
+#  else
+    char s[PATH_MAX+1];
+    int len = readlink(localSymlinkPath.constData(), s, PATH_MAX);
+#  endif
+    if (len <= 0)
+        return false;
+    *target = QFile::decodeName(QByteArray(s, len));
+#  if defined(__GLIBC__) && !defined(PATH_MAX)
+    ::free(s);
+#  endif
+    return true;
+}
 #endif
 
+#endif  // PROEVALUATOR_FULL
+
 QT_END_NAMESPACE
diff --git a/src/shared/proparser/ioutils.h b/src/shared/proparser/ioutils.h
index 150c837369..71a7ffed56 100644
--- a/src/shared/proparser/ioutils.h
+++ b/src/shared/proparser/ioutils.h
@@ -62,6 +62,9 @@ public:
 #endif
 #if defined(PROEVALUATOR_FULL)
     static bool touchFile(const QString &targetFileName, const QString &referenceFileName, QString *errorString);
+# if defined(QT_BUILD_QMAKE) && defined(Q_OS_UNIX)
+    static bool readLinkTarget(const QString &symlinkPath, QString *target);
+# endif
 #endif
 };