From e5ba8dc48e6f906d142a15e34f309bccb79c1ce4 Mon Sep 17 00:00:00 2001
From: nobounce <steffen.winter@proton.me>
Date: Thu, 27 Jul 2023 12:55:00 +0200
Subject: [PATCH] Add CMake support for Linux

---
 CMakeLists.txt | 106 +++++++++++++++++++++++++++++++++++++++++++++++++
 README.md      |  75 +++++++++++++++++++++++++++++++++-
 2 files changed, 180 insertions(+), 1 deletion(-)
 create mode 100644 CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 000000000..307d4a30f
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# CMake configuration file for btop
+cmake_minimum_required(VERSION 3.12)
+
+# -O3 is not tested right now
+set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNDEBUG" CACHE STRING INTERNAL)
+
+# Disable in-source builds since they would override the Makefile
+if("${CMAKE_CURRENT_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_BINARY_DIR}")
+  message(FATAL_ERROR "In-source build are disable to preserve btop's own Makefile")
+endif()
+
+project("btop"
+  VERSION 1.2.13
+  DESCRIPTION "A monitor of resources"
+  HOMEPAGE_URL "https://github.com/aristocratos/btop"
+  LANGUAGES CXX
+)
+
+set(CMAKE_COLOR_DIAGNOSTICS ON)
+# When the build type is empty we can't properly fortify
+if(CMAKE_BUILD_TYPE STREQUAL "")
+  set(CMAKE_BUILD_TYPE Release)
+  message(STATUS "Set build type to Release")
+endif()
+
+add_executable(btop
+  src/btop.cpp
+  src/btop_config.cpp
+  src/btop_draw.cpp
+  src/btop_input.cpp
+  src/btop_menu.cpp
+  src/btop_shared.cpp
+  src/btop_theme.cpp
+  src/btop_tools.cpp
+)
+
+# NOTE: Checks can be simplified with CMake 3.25
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  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 "Linux")
+  target_sources(btop PRIVATE src/linux/btop_collect.cpp)
+else()
+  message(FATAL_ERROR "${CMAKE_SYSTEM_NAME} is not supported")
+endif()
+
+option(BTOP_STATIC "Link btop statically" OFF)
+if(BTOP_STATIC AND NOT MAKE_BUILD_TYPE STREQUAL "Debug")
+  target_compile_definitions(btop PRIVATE STATIC_BUILD)
+  target_link_options(btop PRIVATE -static)
+endif()
+
+option(BTOP_STRIP "Strip executable" ON)
+if(BTOP_STRIP AND CMAKE_BUILD_TYPE STREQUAL "Release")
+  target_link_options(btop PRIVATE -s)
+endif()
+
+set_target_properties(btop PROPERTIES
+  CXX_STANDARD 20
+  CXX_STANDARD_REQUIRED ON
+  CXX_EXTENSIONS OFF
+  INTERPROCEDURAL_OPTIMIZATION ON
+)
+
+include(CheckCXXCompilerFlag)
+check_cxx_compiler_flag(-fstack-protector CXX_HAS_FSTACK_PROTECTOR)
+# TODO: enable more warnings in coordination with upstream
+# TODO: filter out -fstack-clash-protection on arm chips
+target_compile_options(btop PRIVATE -Wall -Wextra -Wpedantic
+  -ftree-vectorize -fstack-clash-protection -fcf-protection
+  $<$<BOOL:CXX_HAS_FSTACK_PROTECTOR>:-fstack-protector>
+)
+
+target_compile_definitions(btop PRIVATE
+  _FILE_OFFSET_BITS=64
+
+  _GLIBCXX_ASSERTIONS _LIBCPP_ENABLE_ASSERTIONS=1
+  # Only has an effect with optimizations enabled
+  $<$<NOT:$<CONFIG:Debug>>:_FORTIFY_SOURCE=2>
+)
+
+target_include_directories(btop SYSTEM PRIVATE include)
+
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+target_link_libraries(btop PRIVATE Threads::Threads)
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  target_link_libraries(btop PRIVATE $<LINK_LIBRARY:FRAMEWORK,CoreFoundation)
+  target_link_libraries(btop PRIVATE $<LINK_LIBRARY:FRAMEWORK,IOKit)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+  target_link_options(btop PRIVATE -lm -lkvm -ldevstat -Wl,-rpath=/usr/local/lib/gcc11)
+endif()
+
+install(TARGETS btop RUNTIME)
+install(FILES "btop.desktop" DESTINATION "share/applications")
+install(FILES "Img/icon.png" DESTINATION "share/icons/hicolor/48x48/apps" RENAME "btop.png")
+install(FILES "Img/icon.svg" DESTINATION "share/icons/hicolor/scalable/apps" RENAME "btop.svg")
+install(DIRECTORY "themes" DESTINATION "share/btop")
diff --git a/README.md b/README.md
index 2eecb9020..33138ca0e 100644
--- a/README.md
+++ b/README.md
@@ -309,7 +309,78 @@ Also needs a UTF8 locale and a font that covers:
 
    The makefile also needs GNU coreutils and `sed` (should already be installed on any modern distribution).
 
-   For a `cmake` based build alternative see the [fork](https://github.com/jan-guenter/btop/tree/main) by @jan-guenter
+<details>
+
+<summary>
+
+### With CMake
+
+</summary>
+
+1. **Install build dependencies**
+
+   Requires g++ / clang++, cmake, ninja and git
+
+   For example, with Debian Bookworm:
+
+   ```bash
+   sudo apt install cmake git g++ ninja-build
+   ```
+
+2. **Clone the repository**
+
+   ```bash
+   git clone https://github.com/aristocratos/btop.git && cd btop
+   ``````
+
+3. **Compile**
+
+   ```bash
+   # Configure
+   cmake -B build -G Ninja
+   # Build
+   cmake --build build
+   ```
+
+   This will automatically build a stripped release version of btop.
+
+   Some useful options to pass to the configure step:
+
+   | Configure flag                  | Description                                                             |
+   |---------------------------------|-------------------------------------------------------------------------|
+   | `-DCMAKE_INSTALL_PREFIX=<path>` | The installation prefix ('/usr/local' by default)                       |
+   | `-DBTOP_STATIC=<ON\|OFF>`       | Enables static linking (OFF by default)                                 |
+   | `-DBTOP_STRIP=<ON\|OFF>`        | Strips symbols from the binary (ON by default for Release builds)       |
+
+   To force a compiler, run `CXX=<compiler> cmake -B build -G Ninja`
+
+4. **Install**
+
+   ```bash
+   cmake --build build install
+   ```
+
+   May require root priviliges
+
+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>
+
+<details>
+
+<summary>
+
+### With Make
+
+</summary>
 
 1. **Install dependencies (example for Ubuntu 21.04 Hirsute)**
 
@@ -397,6 +468,8 @@ Also needs a UTF8 locale and a font that covers:
    make help
    ```
 
+</details>
+
 ## Compilation macOS OSX
 
    Needs GCC 10 or higher, (GCC 11 or above strongly recommended for better CPU efficiency in the compiled binary).