CMake: Enable OpenBSD

CMakeLists.txt

@@ -65,6 +65,8 @@ if(APPLE)
   target_sources(btop PRIVATE src/osx/btop_collect.cpp src/osx/sensors.cpp src/osx/smc.cpp)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   target_sources(btop PRIVATE src/freebsd/btop_collect.cpp)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
+  target_sources(btop PRIVATE src/openbsd/btop_collect.cpp src/openbsd/sysctlbyname.cpp)
 elseif(LINUX)
   target_sources(btop PRIVATE src/linux/btop_collect.cpp)
 else()
@@ -185,6 +187,12 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
     find_package(kvm REQUIRED)
     target_link_libraries(btop elf::elf kvm::kvm)
   endif()
+elseif(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
+  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    target_compile_options(btop PRIVATE -static-libstdc++)
+  endif()
+  find_package(kvm REQUIRED)
+  target_link_libraries(btop kvm::kvm)
 endif()
 
 install(TARGETS btop RUNTIME)

README.md

@@ -995,6 +995,74 @@ If you have an AMD GPU `rocm_smi_lib` is required, which may or may not be packa
    gmake help
    ```
 
+</details>
+<details>
+<summary>
+
+### With CMake (Community maintained)
+</summary>
+
+1. **Install build dependencies**
+
+   Requires GCC, CMake, Ninja and Git
+
+   _**Note:** LLVM's libc++ shipped with OpenBSD 7.4 is too old and cannot compile btop._
+
+   ```bash
+   pkg_add cmake g++%11 git ninja
+   ```
+
+2. **Clone the repository**
+
+   ```bash
+   git clone https://github.com/aristocratos/btop.git && cd btop
+   ```
+
+3. **Compile**
+
+   ```bash
+   # Configure
+   CXX=eg++ cmake -B build -G Ninja
+   # Build
+   cmake --build build
+   ```
+
+   This will automatically build a release version of btop.
+
+   Some useful options to pass to the configure step:
+
+   | Configure flag                  | Description                                                             |
+   |---------------------------------|-------------------------------------------------------------------------|
+   | `-DBTOP_LTO=<ON\|OFF>`          | Enables link time optimization (ON by default)                          |
+   | `-DBTOP_USE_MOLD=<ON\|OFF>`     | Use mold to link btop (OFF by default)                                  |
+   | `-DBTOP_PEDANTIC=<ON\|OFF>`     | Compile with additional warnings (OFF by default)                       |
+   | `-DBTOP_WERROR=<ON\|OFF>`       | Compile with warnings as errors (OFF by default)                        |
+   | `-DBTOP_FORTIFY=<ON\|OFF>`      | Detect buffer overflows with `_FORTIFY_SOURCE=3` (ON by default)        |
+   | `-DCMAKE_INSTALL_PREFIX=<path>` | The installation prefix ('/usr/local' by default)                       |
+
+   To force any other compiler, run `CXX=<compiler> cmake -B build -G Ninja`
+
+4. **Install**
+
+   ```bash
+   cmake --install build
+   ```
+
+   May require root privileges
+
+5. **Uninstall**
+
+   CMake doesn't generate an uninstall target by default. To remove installed files, run
+   ```
+   cat build/install_manifest.txt | xargs rm -irv
+   ```
+
+6. **Cleanup build directory**
+
+   ```bash
+   cmake --build build -t clean
+   ```
+
 </details>
 
 ## Installing the snap

cmake/Modules/Findkvm.cmake

@@ -3,7 +3,7 @@
 # Find libkvm, the Kernel Data Access Library
 #
 
-if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+if(BSD)
   find_path(kvm_INCLUDE_DIR NAMES kvm.h)
   find_library(kvm_LIBRARY NAMES kvm)