cmArchiveWrite: do not store sparse files when using standard tar formats

Sparse files in tars are a GNU extension that libarchive will use if it
detects holes in the input file, even when using the standard pax/paxr
formats. Not all tar implementations can handle sparse files; in particular,
the internal implementation dpkg uses to extract packages can't. To
maximize archive portability, turn this feature off by clearing the
sparseness information from archive entries.

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/cmArchiveWrite.h b/Source/cmArchiveWrite.h
index 794cb282ca..e6f515ddc9 100644
--- a/Source/cmArchiveWrite.h
+++ b/Source/cmArchiveWrite.h
@@ -84,6 +84,7 @@ private:
   struct archive* Archive;
   struct archive* Disk;
   bool Verbose;
+  std::string Format;
   std::string Error;
   std::string MTime;
 };