add code to build on OpenBSD

config/build-definitions.xml

@@ -96,6 +96,9 @@ This script is included in /build.xml and /config/update-dependencies.xml.
     <condition property="platform.freebsd">
         <os name="FreeBSD"/>
     </condition>
+    <condition property="platform.openbsd">
+	<os name="OpenBSD"/>
+    </condition>
     <condition property="platform.solaris">
         <os name="SunOS"/>
     </condition>
@@ -106,10 +109,12 @@ This script is included in /build.xml and /config/update-dependencies.xml.
     <property name="platform" value="windows" if:set="platform.windows"/>
     <property name="platform" value="linux" if:set="platform.linux"/>
     <property name="platform" value="freebsd" if:set="platform.freebsd"/>
+    <property name="platform" value="openbsd" if:set="platform.openbsd"/>
     <property name="platform" value="solaris" if:set="platform.solaris"/>
     <property name="platform" value="macos" if:set="platform.macos"/>
 
     <property name="platform.remote" value="macosx" if:set="platform.macos"/>
+    <property name="platform.remote" value="linux" if:set="platform.openbsd"/>
     <property name="platform.remote" value="${platform}"/>
 
     <!-- JDK version -->

config/openbsd/version.script

@@ -0,0 +1,10 @@
+LWJGL {
+    # Expose symbols required by the JVM
+    global:
+        *org_lwjgl_*;
+        JNI_On*;
+        __wrap_memcpy;
+
+    # Hide everything else
+    local: *;
+};

modules/lwjgl/core/src/main/c/common_tools.h

@@ -10,6 +10,9 @@
 #ifdef LWJGL_LINUX
     #include "LinuxConfig.h"
 #endif
+#ifdef LWJGL_OPENBSD
+    #include "OpenBSDConfig.h"
+#endif
 #ifdef LWJGL_MACOS
     #include "macOSConfig.h"
 #endif

modules/lwjgl/core/src/main/c/openbsd/LinuxLWJGL.h

@@ -0,0 +1,8 @@
+/*
+ * Copyright LWJGL. All rights reserved.
+ * License terms: https://www.lwjgl.org/license
+ */
+#pragma once
+
+#include <X11/X.h>
+#include <X11/Xlib.h>

modules/lwjgl/core/src/main/c/openbsd/OpenBSDConfig.h

@@ -0,0 +1,14 @@
+/*
+ * Copyright LWJGL. All rights reserved.
+ * License terms: https://www.lwjgl.org/license
+ */
+
+#include <stddef.h>
+#include <inttypes.h>
+
+#define DISABLE_WARNINGS()
+#define ENABLE_WARNINGS()
+
+// JNIEXPORT_CRITICAL & CRITICAL are used as a workaround for JDK-8167409 on applicable functions.
+#define JNIEXPORT_CRITICAL static
+#define CRITICAL(function) _JavaCritical_##function

modules/lwjgl/core/src/main/c/openbsd/wrap_memcpy.c

@@ -0,0 +1,9 @@
+#include <stddef.h>
+
+void *old_memcpy(void *, const void *, size_t);
+
+__asm__(".symver old_memcpy,memcpy@GLIBC_2.2.5");
+
+void *__wrap_memcpy(void *dest, const void *src, size_t n) {
+    return old_memcpy(dest, src, n);
+}

modules/lwjgl/remotery/src/main/c/Remotery.c

@@ -92,7 +92,7 @@ static rmtBool g_SettingsInitialized = RMT_FALSE;
         #include <mach/mach.h>
         #include <sys/time.h>
     #else
-        #ifndef __FreeBSD__
+        #if !defined(__FreeBSD__) && !defined(__OpenBSD__)
             #include <malloc.h>
         #endif
     #endif
@@ -248,7 +248,7 @@ static rmtU32 msTimer_Get()
         clock_t time = clock();
 
         // CLOCKS_PER_SEC is 128 on FreeBSD, causing div/0
-        #ifdef __FreeBSD__
+        #if defined(__FreeBSD__) || defined(__OpenBSD__)
             rmtU32 msTime = (rmtU32) (time * 1000 / CLOCKS_PER_SEC);
         #else
             rmtU32 msTime = (rmtU32) (time / (CLOCKS_PER_SEC / 1000));
@@ -322,7 +322,7 @@ static rmtU64 usTimer_Get(usTimer* timer)
         rmtU64 curr_time = mach_absolute_time();
         return (rmtU64)((curr_time - timer->counter_start) * timer->counter_scale);
 
-    #elif defined(RMT_PLATFORM_LINUX)
+    #elif defined(RMT_PLATFORM_LINUX) || defined(__OpenBSD__)
 
         struct timespec tv;
         clock_gettime(CLOCK_REALTIME, &tv);
@@ -4734,6 +4734,8 @@ static rmtError Remotery_ConsumeMessageQueue(Remotery* rmt)
                 error = Remotery_SendSampleTreeMessage(rmt, message);
                 rmt_EndCPUSample();
                 break;
+	    default:
+		break;
         }
 
         // Consume the message before reacting to any errors
@@ -4771,6 +4773,8 @@ static void Remotery_FlushMessageQueue(Remotery* rmt)
                 FreeSampleTree(sample_tree->root_sample, sample_tree->allocator);
                 break;
             }
+	    default:
+		break;
         }
 
         rmtMessageQueue_ConsumeNextMessage(rmt->mq_to_rmt_thread, message);

modules/lwjgl/remotery/src/main/c/Remotery.h

@@ -122,6 +122,8 @@ documented just below this comment.
 #elif defined(__linux__) || defined(__FreeBSD__)
     #define RMT_PLATFORM_LINUX
     #define RMT_PLATFORM_POSIX
+#elif defined(__OpenBSD__)
+    #define RMT_PLATFORM_POSIX
 #elif defined(__APPLE__)
     #define RMT_PLATFORM_MACOS
     #define RMT_PLATFORM_POSIX