Merge 5.9 into 5.9.0v5.9.0-beta4

Change-Id: Id3fc911f024cba292a5c426b36aa94ff9f3c0ef7

1 files changed, 35 insertions, 0 deletions

diff --git a/qmake/library/ioutils.cpp b/qmake/library/ioutils.cpp
index 39264952c6..684bcb9a37 100644
--- a/qmake/library/ioutils.cpp
+++ b/qmake/library/ioutils.cpp
@@ -253,4 +253,39 @@ bool IoUtils::touchFile(const QString &targetFileName, const QString &referenceF
 }
 #endif
 
+#ifdef 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
+
 QT_END_NAMESPACE