From e3a528a49353541ca6e6b281d78353c6e16e52a9 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 9 May 2018 13:06:34 -0400
Subject: [PATCH] report compile time options (-DLAMMPS_XXX) in help output and
 info config

---
 src/info.cpp   |  1 +
 src/lammps.cpp | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/lammps.h   |  1 +
 3 files changed, 66 insertions(+)

diff --git a/src/info.cpp b/src/info.cpp
index 65c0cd9b53..1a5bc21209 100644
--- a/src/info.cpp
+++ b/src/info.cpp
@@ -262,6 +262,7 @@ void Info::command(int narg, char **arg)
 
     fprintf(out,"\nLAMMPS version: %s / %s\n",
             universe->version, universe->num_ver);
+    lmp->print_config(out);
     fprintf(out,"sizeof(smallint): %3d-bit\n",(int)sizeof(smallint)*8);
     fprintf(out,"sizeof(imageint): %3d-bit\n",(int)sizeof(imageint)*8);
     fprintf(out,"sizeof(tagint):   %3d-bit\n",(int)sizeof(tagint)*8);
diff --git a/src/lammps.cpp b/src/lammps.cpp
index 56af95767b..6a326e2abb 100644
--- a/src/lammps.cpp
+++ b/src/lammps.cpp
@@ -31,6 +31,7 @@
 #include "style_region.h"
 #include "universe.h"
 #include "input.h"
+#include "info.h"
 #include "atom.h"
 #include "update.h"
 #include "neighbor.h"
@@ -823,6 +824,8 @@ void LAMMPS::help()
           "-var varname value          : set index style variable (-v)\n\n",
           exename);
 
+
+  print_config(fp);
   fprintf(fp,"List of style options included in this LAMMPS executable\n\n");
 
   int pos = 80;
@@ -974,3 +977,64 @@ void print_style(FILE *fp, const char *str, int &pos)
     pos += 80;
   }
 }
+
+static const char lammps_config_options[]
+= "LAMMPS compile time settings:\n"
+  "Integer sizes setting:    "
+#if defined(LAMMPS_SMALLSMALL)
+  " -DLAMMPS_SMALLSMALL"
+#elif defined(LAMMPS_SMALLBIG)
+  " -DLAMMPS_SMALLBIG"
+#elif defined(LAMMPS_BIGBIG)
+  " -DLAMMPS_BIGBIG"
+#else
+  " (unkown)"
+#endif
+  "\nExternal commands support:"
+#if defined(LAMMPS_GZIP)
+  " -DLAMMPS_GZIP"
+#endif
+#if defined(LAMMPS_FFMPEG)
+  " -DLAMMPS_FFMPEG"
+#endif
+  "\nImage library support:    "
+#if defined(LAMMPS_JPEG)
+  " -DLAMMPS_JPEG"
+#endif
+#if defined(LAMMPS_PNG)
+  " -DLAMMPS_PNG"
+#endif
+  "\nFFT library support:      "
+#if defined(FFT_SINGLE)
+  " -DFFT_SINGLE"
+#endif
+#if defined(FFT_FFTW) || defined(FFT_FFTW3)
+  " -DFFT_FFTW3"
+#elif defined(FFT_FFTW2)
+  " -DFFT_FFTW2"
+#elif defined(FFT_MKL)
+  " -DFFT_MKL"
+#else
+  " -DFFT_KISSFFT"
+#endif
+  "\nMemory alignment:         "
+#if defined(LAMMPS_MEMALIGN)
+#define lmp_str(s) #s
+#define lmp_xstr(s) lmp_str(s)
+  " -DLAMMPS_MEMALIGN=" lmp_xstr(LAMMPS_MEMALIGN)
+#else
+  " (default)"
+#endif
+
+  "\nException support:        "
+#if defined(LAMMPS_EXCEPTIONS)
+  " -DLAMMPS_EXCEPTIONS\n"
+#else
+  " (not enabled)\n"
+#endif
+  "\n";
+
+void LAMMPS::print_config(FILE *fp)
+{
+  fputs(lammps_config_options,fp);
+}
diff --git a/src/lammps.h b/src/lammps.h
index 1323dcccc8..6473985736 100644
--- a/src/lammps.h
+++ b/src/lammps.h
@@ -65,6 +65,7 @@ class LAMMPS {
   void post_create();
   void init();
   void destroy();
+  void print_config(FILE *);    // print compile time settings
 
  private:
   void help();