cpack wix: support WiX generator on Cygwin

Cygwin-built CMake now converts paths from Cygwin to Windows form
(using cygpath -w) before they're passed to WiX.

The Wix generator on Cygwin requires the libuuid-dev package when
building CMake. However, the DLL it links to is installed by default
as part of Cygwin's core libs, so it does not need to be distributed.

If libuuid-dev isn't available, CMake is simply built without Wix
support on Cygwin.

1 files changed, 39 insertions, 0 deletions

diff --git a/Source/CPack/WiX/cmCMakeToWixPath.cxx b/Source/CPack/WiX/cmCMakeToWixPath.cxx
new file mode 100644
index 0000000000..0b0e42aa92
--- /dev/null
+++ b/Source/CPack/WiX/cmCMakeToWixPath.cxx
@@ -0,0 +1,39 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmCMakeToWixPath.h"
+
+#include "cmSystemTools.h"
+
+#include <string>
+#include <vector>
+
+#ifdef __CYGWIN__
+#include <sys/cygwin.h>
+std::string CMakeToWixPath(const std::string& cygpath)
+{
+  std::vector<char> winpath_chars;
+  ssize_t winpath_size;
+
+  // Get the required buffer size.
+  winpath_size =
+    cygwin_conv_path(CCP_POSIX_TO_WIN_A, cygpath.c_str(), nullptr, 0);
+  if (winpath_size <= 0) {
+    return cygpath;
+  }
+
+  winpath_chars.assign(static_cast<size_t>(winpath_size) + 1, '\0');
+
+  winpath_size = cygwin_conv_path(CCP_POSIX_TO_WIN_A, cygpath.c_str(),
+                                  winpath_chars.data(), winpath_size);
+  if (winpath_size < 0) {
+    return cygpath;
+  }
+
+  return cmSystemTools::TrimWhitespace(winpath_chars.data());
+}
+#else
+std::string CMakeToWixPath(const std::string& path)
+{
+  return path;
+}
+#endif