Linux build fixes.

hashset/Makefile

@@ -13,7 +13,7 @@ endif
   EXE_SUFFIX := .exe
 endif
 
-CFLAGS = -O3 -DNDEBUG -I../libhashset/include $(XCFLAGS)
+CFLAGS = -std=c99 -O3 -DNDEBUG -D_DEFAULT_SOURCE -Wpedantic -I../libhashset/include $(XCFLAGS)
 
 SRC_PATH := src
 BIN_PATH := bin

hashset/src/main.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <string.h>
+#include <errno.h>
 
 #ifndef _WIN32
 #  include <unistd.h>

libhashset/Makefile

@@ -6,7 +6,7 @@ else ifneq ($(firstword $(filter i686-%,$(DUMPMACHINE))),)
   XCFLAGS = -march=pentiumpro -mtune=intel
 endif
 
-CFLAGS = -O3 -DNDEBUG -Iinclude $(XCFLAGS)
+CFLAGS = -std=c99 -O3 -DNDEBUG -Wpedantic -Iinclude $(XCFLAGS)
 
 SRC_PATH := src
 OBJ_PATH := obj

libhashset/include/hash_set.h

@@ -3,8 +3,8 @@
 /* This work has been released under the CC0 1.0 Universal license!           */
 /******************************************************************************/
 
-#ifndef _INC_HASH_SET_H
-#define _INC_HASH_SET_H
+#ifndef _HASHSET_INCLUDED
+#define _HASHSET_INCLUDED
 
 #include <stdlib.h>
 #include <stdint.h>
@@ -13,6 +13,11 @@
 extern "C" {
 #endif
 
+#if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_ERRNO_T_DEFINED)
+typedef int errno_t;
+#define _ERRNO_T_DEFINED 1
+#endif
+
 #define HASHSET_OPT_FAILFAST UINT16_C(0x1)
 
 struct _hash_set;

libhashset/src/hash_set.c

@@ -8,6 +8,7 @@
 /* CRT */
 #include <string.h>
 #include <errno.h>
+#include <limits.h>
 #include <float.h>
 
 typedef int bool_t;