Make Zstd support optional

cmake/Modules/Packages/COMPRESS.cmake

@@ -1,5 +1,9 @@
 find_package(ZLIB REQUIRED)
 target_link_libraries(lammps PRIVATE ZLIB::ZLIB)
 
-find_package(Zstd REQUIRED)
+find_package(Zstd)
+
+if(Zstd_FOUND)
+    target_compile_definitions(lammps PRIVATE -DLAMMPS_ZSTD)
     target_link_libraries(lammps PRIVATE Zstd::Zstd)
+endif()

src/COMPRESS/README

@@ -10,5 +10,9 @@ alternative for compressed file I/O on systems where using a pipe can
 cause problems, e.g. when using RDMA communication with pinned memory
 like clusters with Infiniband or Myrinet.
 
+Update 08/2020: Added variants that use the Zstd compression library instead
+of zlib. To enable, set -DLAMMPS_ZSTD. These provide a wider range of
+compression levels. See http://facebook.github.io/zstd/ for more details.
+
 Currently a few selected dump styles are supported for writing via
 this packaging.

src/COMPRESS/dump_atom_zstd.cpp

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #include "dump_atom_zstd.h"
 #include "domain.h"
 #include "error.h"
@@ -189,3 +191,5 @@ int DumpAtomZstd::modify_param(int narg, char **arg)
   }
   return consumed;
 }
+
+#endif

src/COMPRESS/dump_atom_zstd.h

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #ifdef DUMP_CLASS
 
 DumpStyle(atom/zstd,DumpAtomZstd)
@@ -47,6 +49,7 @@ class DumpAtomZstd : public DumpAtom {
 
 }
 
+#endif
 #endif
 #endif
 

src/COMPRESS/dump_cfg_zstd.cpp

@@ -15,6 +15,7 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
 #include "dump_cfg_zstd.h"
 #include "atom.h"
 #include "domain.h"
@@ -192,3 +193,4 @@ int DumpCFGZstd::modify_param(int narg, char **arg)
   }
   return consumed;
 }
+#endif

src/COMPRESS/dump_cfg_zstd.h

@@ -15,6 +15,7 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
 #ifdef DUMP_CLASS
 
 DumpStyle(cfg/zstd,DumpCFGZstd)
@@ -47,6 +48,7 @@ class DumpCFGZstd : public DumpCFG {
 
 }
 
+#endif
 #endif
 #endif
 

src/COMPRESS/dump_custom_zstd.cpp

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #include "dump_custom_zstd.h"
 #include "domain.h"
 #include "error.h"
@@ -189,3 +191,5 @@ int DumpCustomZstd::modify_param(int narg, char **arg)
   }
   return consumed;
 }
+
+#endif

src/COMPRESS/dump_custom_zstd.h

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #ifdef DUMP_CLASS
 
 DumpStyle(custom/zstd,DumpCustomZstd)
@@ -48,6 +50,7 @@ class DumpCustomZstd : public DumpCustom {
 
 }
 
+#endif
 #endif
 #endif
 

src/COMPRESS/dump_local_zstd.cpp

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #include "dump_local_zstd.h"
 #include "domain.h"
 #include "error.h"
@@ -189,3 +191,5 @@ int DumpLocalZstd::modify_param(int narg, char **arg)
   }
   return consumed;
 }
+
+#endif

src/COMPRESS/dump_local_zstd.h

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #ifdef DUMP_CLASS
 
 DumpStyle(local/zstd,DumpLocalZstd)
@@ -47,6 +49,7 @@ class DumpLocalZstd : public DumpLocal {
 
 }
 
+#endif
 #endif
 #endif
 

src/COMPRESS/dump_xyz_zstd.cpp

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #include "dump_xyz_zstd.h"
 #include "error.h"
 #include "update.h"
@@ -164,3 +166,5 @@ int DumpXYZZstd::modify_param(int narg, char **arg)
   }
   return consumed;
 }
+
+#endif

src/COMPRESS/dump_xyz_zstd.h

@@ -15,6 +15,8 @@
    Contributing author: Richard Berger (Temple U)
 ------------------------------------------------------------------------- */
 
+#ifdef LAMMPS_ZSTD
+
 #ifdef DUMP_CLASS
 
 DumpStyle(xyz/zstd,DumpXYZZstd)
@@ -47,6 +49,7 @@ class DumpXYZZstd : public DumpXYZ {
 
 }
 
+#endif
 #endif
 #endif