Add initial support for MidnightBSD

[laffer1]

This build works on MidnightBSD 3.2.1+ (stable/3.2 branch or current)

[CarterLi]

Does GCC on MidnightBSD define __FreeBSD__? Does this patch work (as what I did for DragonFly)?

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc33bf5b..e3481ec0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,9 @@ elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "NetBSD")
 elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "DragonFly")
     set(FreeBSD TRUE CACHE BOOL "..." FORCE)
     set(DragonFly TRUE CACHE BOOL "..." FORCE)
+elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "MidnightBSD")
+    set(FreeBSD TRUE CACHE BOOL "..." FORCE)
+    set(MidnightBSD TRUE CACHE BOOL "..." FORCE)
 elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS")
     set(SunOS TRUE CACHE BOOL "..." FORCE)
 elseif(NOT APPLE AND NOT WIN32)

[CarterLi]

Does GCC define __MidnightBSD__ or something similar?

[CarterLi]

Does MidnightBSD use FreeBSD libc?

[laffer1]

MidnightBSD uses FreeBSD libc with some additions. So there are FBSD symbol versions and also MBSD versions.

[CarterLi]

I guess using MBSD versions is better.

[laffer1]

MidnightBSD defines both __MidnightBSD__ and __FreeBSD__ in current versions.

[CarterLi]

If you use set(FreeBSD TRUE CACHE BOOL "..." FORCE), all those OR MidnightBSD check can be omitted.

[CarterLi]

diff --git a/src/detection/version/version.c b/src/detection/version/version.c
index 8b230eec..1f1deb34 100644
--- a/src/detection/version/version.c
+++ b/src/detection/version/version.c
@@ -28,6 +28,8 @@
     #define FF_SYSNAME "Linux"
 #elif defined(__DragonFly__) // We define `__FreeBSD__` on DragonFly BSD for simplification
     #define FF_SYSNAME "DragonFly"
+#elif defined(__MidnightBSD__)
+    #define FF_SYSNAME "MidnightBSD"
 #elif defined(__FreeBSD__)
     #define FF_SYSNAME "FreeBSD"
 #elif defined(__APPLE__)