BSD: Set *BSD variables when targeting a *BSD system

Fixes: #23853

11 files changed, 52 insertions, 0 deletions

diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index 9fc8a79..1380a179 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -301,6 +301,7 @@ Variables that Describe the System
    /variable/ANDROID
    /variable/APPLE
    /variable/BORLAND
+   /variable/BSD
    /variable/CMAKE_ANDROID_NDK_VERSION
    /variable/CMAKE_CL_64
    /variable/CMAKE_COMPILER_2005
@@ -320,6 +321,8 @@ Variables that Describe the System
    /variable/CMAKE_SYSTEM_PROCESSOR
    /variable/CMAKE_SYSTEM_VERSION
    /variable/CYGWIN
+   /variable/DRAGONFLYBSD
+   /variable/FREEBSD
    /variable/GHSMULTI
    /variable/IOS
    /variable/LINUX
@@ -338,6 +341,8 @@ Variables that Describe the System
    /variable/MSVC_TOOLSET_VERSION
    /variable/MSVC_VERSION
    /variable/MSYS
+   /variable/NETBSD
+   /variable/OPENBSD
    /variable/UNIX
    /variable/WIN32
    /variable/WINCE
diff --git a/Help/release/dev/bsd-variables.rst b/Help/release/dev/bsd-variables.rst
new file mode 100644
index 0000000..9d59edc
--- /dev/null
+++ b/Help/release/dev/bsd-variables.rst
@@ -0,0 +1,9 @@
+bsd-variables
+-------------
+
+* The :variable:`BSD` variable is set to true when the target system
+  is BSD (DragonFlyBSD, FreeBSD, OpenBSD, or NetBSD)
+* The :variable:`DRAGONFLYBSD` variable is set to true when the target system is DragonFlyBSD.
+* The :variable:`FREEBSD` variable is set to true when the target system is FreeBSD.
+* The :variable:`NETBSD` variable is set to true when the target system is NetBSD.
+* The :variable:`OPENBSD` variable is set to true when the target system is OpenBSD.
diff --git a/Help/variable/BSD.rst b/Help/variable/BSD.rst
new file mode 100644
index 0000000..0b3e5dc
--- /dev/null
+++ b/Help/variable/BSD.rst
@@ -0,0 +1,6 @@
+BSD
+---
+
+.. versionadded:: 3.25
+
+Set to true when the target system is BSD (DragonFlyBSD, FreeBSD, OpenBSD, or NetBSD)
diff --git a/Help/variable/DRAGONFLYBSD.rst b/Help/variable/DRAGONFLYBSD.rst
new file mode 100644
index 0000000..f006156
--- /dev/null
+++ b/Help/variable/DRAGONFLYBSD.rst
@@ -0,0 +1,6 @@
+DRAGONFLYBSD
+------------
+
+.. versionadded:: 3.25
+
+Set to true when the target system is DragonFlyBSD.
diff --git a/Help/variable/FREEBSD.rst b/Help/variable/FREEBSD.rst
new file mode 100644
index 0000000..9990948
--- /dev/null
+++ b/Help/variable/FREEBSD.rst
@@ -0,0 +1,6 @@
+FREEBSD
+-------
+
+.. versionadded:: 3.25
+
+Set to true when the target system is FreeBSD.
diff --git a/Help/variable/NETBSD.rst b/Help/variable/NETBSD.rst
new file mode 100644
index 0000000..e7965f8
--- /dev/null
+++ b/Help/variable/NETBSD.rst
@@ -0,0 +1,6 @@
+NETBSD
+------
+
+.. versionadded:: 3.25
+
+Set to true when the target system is NetBSD.
diff --git a/Help/variable/OPENBSD.rst b/Help/variable/OPENBSD.rst
new file mode 100644
index 0000000..dd9b23d
--- /dev/null
+++ b/Help/variable/OPENBSD.rst
@@ -0,0 +1,6 @@
+OPENBSD
+-------
+
+.. versionadded:: 3.25
+
+Set to true when the target system is OpenBSD.
diff --git a/Modules/Platform/DragonFly.cmake b/Modules/Platform/DragonFly.cmake
index 12e5f3c..d8bc05a 100644
--- a/Modules/Platform/DragonFly.cmake
+++ b/Modules/Platform/DragonFly.cmake
@@ -3,6 +3,8 @@
 # see http://archive.netbsd.se/?ml=dfbsd-users&a=2007-07&m=4678361
 
 include(Platform/FreeBSD)
+unset(FREEBSD)
+set(DRAGONFLYBSD 1)
 
 # DragonFly BSD requires -z origin to enable $ORIGIN expansion in RPATH.
 # This is not required for FreeBSD since 10.2-RELEASE.
diff --git a/Modules/Platform/FreeBSD.cmake b/Modules/Platform/FreeBSD.cmake
index bd5a786..e968a78 100644
--- a/Modules/Platform/FreeBSD.cmake
+++ b/Modules/Platform/FreeBSD.cmake
@@ -1,3 +1,5 @@
+set(FREEBSD 1)
+set(BSD 1)
 set(CMAKE_DL_LIBS "")
 set(CMAKE_C_COMPILE_OPTIONS_PIC "-fPIC")
 set(CMAKE_C_COMPILE_OPTIONS_PIE "-fPIE")
diff --git a/Modules/Platform/NetBSD.cmake b/Modules/Platform/NetBSD.cmake
index ab85923..a64bf0b 100644
--- a/Modules/Platform/NetBSD.cmake
+++ b/Modules/Platform/NetBSD.cmake
@@ -1,3 +1,5 @@
+set(NETBSD 1)
+set(BSD 1)
 set(CMAKE_DL_LIBS "")
 set(CMAKE_C_COMPILE_OPTIONS_PIC "-fPIC")
 set(CMAKE_C_COMPILE_OPTIONS_PIE "-fPIE")
diff --git a/Modules/Platform/OpenBSD.cmake b/Modules/Platform/OpenBSD.cmake
index 97e2a6a..f6b955a 100644
--- a/Modules/Platform/OpenBSD.cmake
+++ b/Modules/Platform/OpenBSD.cmake
@@ -1,4 +1,6 @@
 include(Platform/NetBSD)
+unset(NETBSD)
+set(OPENBSD 1)
 
 # On OpenBSD, the compile time linker does not share it's configuration with
 # the runtime linker.  This will extract the library search paths from the