Cleans up source

This primary purpose of this commit is to make some minor changes to the
code to clean it up a bit. Notable changes are as follows:
* The macro `__OPENMP__` is replaced by `_OPENMP`. `__OPENMP__` was an
  artifact from the old build system, which defined such a macro when
  the build was configured with OpenMP support. According to the [OpenMP
  specification](https://www.openmp.org/specifications/) Section
  [2.2](https://www.openmp.org/spec-html/5.1/openmpse10.html#x38-370002.2) "the
  `_OPENMP` macro name is defined to have the decimal value *yyyymm*
  where *yyyy* and *mm* are the year and month designations of the
  version of the OpenMP API that the implementation supports." As such,
  it should be the preferred way to check for OpenMP support during
  compilation.
* The preprocessor condition `defined(__WITHPCRE__)` is replaced by
  `defined(USE_PCRE) && defined(HAVE_PCREPOSIX_H)`. `__WITHPCRE__` was an
  artifact from the old build system, which was defined during configuration if
  the build system user requested PCRE support. This functionality has been
  replaced by the macro name `USER_PCRE` to be consistent with the other feature
  availability checks done in the core CMake logic and the condition has been
  extended to not only check for the request (`USER_PCRE`), but also the
  availability of the necessary header file, namely `pcreposix.h` indicated by
  the macro name `HAVE_PCREPOSIX_H` being defined during CMake configuration.

apps/cmpnbrs.c

@@ -9,7 +9,7 @@
 \version \verbatim $Id: m2mnbrs.c 17699 2014-09-27 18:05:31Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/csrcnv.c

@@ -8,7 +8,7 @@
 \version \verbatim $Id: csrcnv.c 15314 2013-10-05 16:50:50Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/fis.c

@@ -7,7 +7,7 @@
 \version \verbatim $Id: fis.c 11075 2011-11-11 22:31:52Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/gkgraph.c

@@ -7,7 +7,7 @@
 \version \verbatim $Id: gkgraph.c 17700 2014-09-27 18:10:02Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

apps/gkrw.c

@@ -7,7 +7,7 @@
 \version \verbatim $Id$ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/gksort.c

@@ -7,7 +7,7 @@
 \version\verbatim $Id: gksort.c 11058 2011-11-10 00:02:50Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 #define N       10000
 

apps/gkuniq.c

@@ -6,7 +6,7 @@
 \author George
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/grKx.c

@@ -7,7 +7,7 @@
 \version \verbatim $Id: grKx.c 17699 2014-09-27 18:05:31Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/m2mnbrs.c

@@ -8,7 +8,7 @@
 \version \verbatim $Id: m2mnbrs.c 17699 2014-09-27 18:05:31Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /*! Data structures for the code */

apps/splatt2svd.c

@@ -6,7 +6,7 @@
 \author George
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 int main(int argc, char *argv[])

apps/strings.c

@@ -7,7 +7,7 @@
 \version\verbatim $Id: strings.c 10711 2011-08-31 22:23:04Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

include/GKlib/GKlib.h

@@ -43,41 +43,39 @@
 #include <assert.h>
 #include <sys/stat.h>
 
-#if defined(__WITHPCRE__)
+#if defined(USE_PCRE) && defined(HAVE_PCREPOSIX_H)
   #include <pcreposix.h>
+#elif defined(HAVE_REGEX_H)
+  #include <regex.h>
 #else
-  #if defined(USE_GKREGEX)
-    #include "gkregex.h"
-  #else
-    #include <regex.h>
-  #endif /* defined(USE_GKREGEX) */
-#endif /* defined(__WITHPCRE__) */
+  #include "gkregex.h"
+#endif
 
 
 
-#if defined(__OPENMP__) 
+#if defined(_OPENMP)
 #include <omp.h>
 #endif
 
 
 
 
-#include <gk_types.h>
-#include <gk_struct.h>
-#include <gk_externs.h>
-#include <gk_defs.h>
-#include <gk_macros.h>
-#include <gk_getopt.h>
+#include "gk_types.h"
+#include "gk_struct.h"
+#include "gk_externs.h"
+#include "gk_defs.h"
+#include "gk_macros.h"
+#include "gk_getopt.h"
 
-#include <gk_mksort.h>
-#include <gk_mkblas.h>
-#include <gk_mkmemory.h>
-#include <gk_mkpqueue.h>
-#include <gk_mkpqueue2.h>
-#include <gk_mkrandom.h>
-#include <gk_mkutils.h>
+#include "gk_mksort.h"
+#include "gk_mkblas.h"
+#include "gk_mkmemory.h"
+#include "gk_mkpqueue.h"
+#include "gk_mkpqueue2.h"
+#include "gk_mkrandom.h"
+#include "gk_mkutils.h"
 
-#include <gk_proto.h>
+#include "gk_proto.h"
 
 
 #endif  /* GKlib.h */

include/GKlib/gk_getopt.h

@@ -46,17 +46,17 @@ struct gk_option {
 };
 
 /* Names for the values of the `has_arg' field of `struct gk_option'.  */
-#define no_argument		0
-#define required_argument	1
-#define optional_argument	2
+#define no_argument       0
+#define required_argument 1
+#define optional_argument 2
 
 
 /* Function prototypes */
-extern int gk_getopt(int __argc, char **__argv, char *__shortopts);
-extern int gk_getopt_long(int __argc, char **__argv, char *__shortopts,
-              struct gk_option *__longopts, int *__longind);
-extern int gk_getopt_long_only (int __argc, char **__argv,
-              char *__shortopts, struct gk_option *__longopts, int *__longind);
+extern int gk_getopt(int argc, char **argv, char *shortopts);
+extern int gk_getopt_long(int argc, char **argv, char *shortopts,
+              struct gk_option *longopts, int *longind);
+extern int gk_getopt_long_only (int argc, char **argv,
+              char *shortopts, struct gk_option *longopts, int *longind);
 
 
 

include/GKlib/gk_mkpqueue.h

@@ -391,6 +391,9 @@ int FPRFX ## CheckHeap(PQT *queue)\
   heap    = queue->heap;\
   locator = queue->locator;\
   nnodes  = queue->nnodes;\
+\
+  /* silence unused-but-set-variable */\
+  (void)heap;\
 \
   if (nnodes == 0)\
     return 1;\

include/GKlib/gk_proto.h

@@ -289,7 +289,7 @@ uint32_t gk_randint32(void);
 /*-------------------------------------------------------------
  * OpenMP fake functions
  *-------------------------------------------------------------*/
-#if !defined(__OPENMP__)
+#if !defined(_OPENMP)
 void omp_set_num_threads(int num_threads);
 int omp_get_num_threads(void);
 int omp_get_max_threads(void);
@@ -300,7 +300,7 @@ void omp_set_dynamic(int num_threads);
 int omp_get_dynamic(void);
 void omp_set_nested(int nested);
 int omp_get_nested(void);
-#endif /* __OPENMP__ */
+#endif /* _OPENMP */
 
 
 /*-------------------------------------------------------------

src/blas.c

@@ -15,7 +15,7 @@ which is used for code generation.
 \version\verbatim $Id: blas.c 14330 2013-05-18 12:15:15Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 

src/cache.c

@@ -9,7 +9,7 @@
 \version $Id: cache.c 21991 2018-04-16 03:08:12Z karypis $
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

src/csr.c

@@ -7,7 +7,7 @@
  * \version\verbatim $Id: csr.c 21044 2017-05-24 22:50:32Z karypis $ \endverbatim
  */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 #define OMPMINOPS       50000
 

src/error.c

@@ -13,7 +13,7 @@ This file contains functions dealing with error reporting and termination
 #define _GK_ERROR_C_  /* this is needed to properly declare the gk_jub* variables
                          as an extern function in GKlib.h */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /* These are the jmp_buf for the graceful exit in case of severe errors.

src/evaluate.c

@@ -7,7 +7,7 @@
   \version\verbatim $Id: evaluate.c 13328 2012-12-31 14:57:40Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /**********************************************************************
  * This function computes the max accuracy score of a ranked list,

src/fkvkselect.c

@@ -8,7 +8,7 @@
 */
 
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /* Byte-wise swap two items of size SIZE. */
 #define QSSWAP(a, b, stmp) do { stmp = (a); (a) = (b); (b) = stmp; } while (0)

src/fs.c

@@ -11,7 +11,7 @@ the filesystem in a portable way.
 */
 
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 

src/getopt.c

@@ -34,7 +34,7 @@ So, do read the documentation here.
 /*************************************************************************/
 
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************/
 /* Local function prototypes */

src/gk_util.c

@@ -8,7 +8,7 @@
 */
 
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************

src/graph.c

@@ -7,7 +7,7 @@
  * \version\verbatim $Id: graph.c 22415 2019-09-05 16:55:00Z karypis $ \endverbatim
  */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 #define OMPMINOPS       50000
 
@@ -294,7 +294,7 @@ gk_graph_t *gk_graph_Read(char *filename, int format, int hasvals,
       fpin = gk_fopen(filename, "r", "gk_graph_Read: fpin");
 
       if (format == GK_GRAPH_FMT_HIJV) { /* read and ignore the #rows/#cols values */
-        if (fscanf(fpin, "%"SCNd64" %"SCNd64, &i, &i) != 2)
+        if (fscanf(fpin, "%zu %zu", &i, &i) != 2)
           gk_errexit(SIGERR, "Error: Failed to read the header line.\n");
       }
 

src/htable.c

@@ -8,7 +8,7 @@
  *
  */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /******************************************************************************
 * This function creates the hash-table

src/io.c

@@ -16,7 +16,7 @@ This file contains various functions that perform I/O.
 #undef _GNU_SOURCE
 #endif
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*************************************************************************
 * This function opens a file

src/itemsets.c

@@ -10,7 +10,7 @@
  * \version\verbatim $Id: itemsets.c 19240 2015-10-22 12:41:19Z karypis $ \endverbatim
  */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /*-------------------------------------------------------------*/
 /*! Data structures for use within this module */

src/mcore.c

@@ -8,7 +8,7 @@
 \version $Id: mcore.c 13953 2013-03-30 16:20:07Z karypis $
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

src/memory.c

@@ -13,7 +13,7 @@ can be used to define other memory allocation routines.
 */
 
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 /* This is for the global mcore that tracks all heap allocations */
 static __thread gk_mcore_t *gkmcore = NULL;

src/pqueue.c

@@ -9,7 +9,7 @@ The priority queues are generated using the GK_MKPQUEUE macro.
 \version\verbatim $Id: pqueue.c 10711 2011-08-31 22:23:04Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

src/random.c

@@ -8,7 +8,7 @@
 \version\verbatim $Id: random.c 18796 2015-06-02 11:39:45Z karypis $ \endverbatim
 */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

src/rw.c

@@ -8,7 +8,7 @@
  * \version\verbatim $Id: rw.c 11078 2011-11-12 00:20:44Z karypis $ \endverbatim
  */
 
-#include <GKlib.h>
+#include "GKlib.h"
 
 
 /*************************************************************************/

src/seq.c

@@ -8,7 +8,7 @@
  */
 
 
-#include <GKlib.h>
+#include "GKlib.h"