1. Overview

此處只是提供簡單的範例。

有時編譯 Open-source 常會遇到某些語法不清楚或錯誤時，上網路也找不著相關的教學，這時便是寫個相似的語法進行除錯，剛好這個範例提供了框架，方便進行修改和測試。

網路上有討論各個編譯時的快或慢，但在絕對的電腦下，速度不是問題；反而好除錯、好移植才是好的“自動化構建”。

構建工具只是輔助工具，我們要的是完成構建後的成果。身為軟體工程師的職責不應該花大時間去學寫構建工具，而構建工具越多 functions 和變異，越是造成進入門檻，請大家認真去思考這問題。

1.1. make

就想像是 Shell Script 的進化版本，提供相依性，除錯相對的直覺化。

flowchart LR
	Start([Start])
	subgraph make[make]
		Makefile[Makefile]
	end
	End([End])
	environment[environment variable]
	style environment fill:#bbf,color:#000000,stroke:#f66,stroke-width:4px,stroke-dasharray: 5 2

	Start --> make --> |make|Target -->End
	make -..- environment

1.2. cmake

其實已經習慣 make 的運作，cmake 反而是多餘。

請勿在 install - DESTINATION (CMakeLists.txt) 加入 CMAKE_INSTALL_PREFIX。

flowchart LR
	Start([Start])
	subgraph cmake[cmake]
		direction LR
		CMakeLists[CMakeLists.txt]
		cross[-DCMAKE_TOOLCHAIN_FILE=./cmake/build_x86.cmake]
	end
	End([End])
	environment[environment variable]
	style environment fill:#bbf,color:#000000,stroke:#f66,stroke-width:4px,stroke-dasharray: 5 2

	Start --> cmake --> build_xxx --> |make|Target --> End
	cmake -..- environment

1.3. meson

meson_options.txt 要與 meson.build (第一個讀取的) 放在同一層目錄。

meson 的限制很多，如

不支援讀取 environment variable。

meson.build:1:0: ERROR: prefix value './install' must be an absolute path。

這些都對於 Cross-Compilation 是很不友善的。

另外對於一個大專案，有 make, Perl, shell script, cmake 等混合之編譯環境，就是這麼困難修改。

有時要解決 python 版本的問題，真的很浪費時間。

flowchart LR
	Start([Start])
	subgraph meson[meson]
		direction LR
		meson_build[00 - meson.build]
		meson_options[meson_options.txt]
		cross[--cross-file build.meson]
		subgraph meson_public[./meson_public]
			meson_build_public[01 - meson.build]
		end
		meson_build_public-..-meson_options

		style meson_options fill:#bbf,color:#000000,stroke:#f66,stroke-width:4px,stroke-dasharray: 5 2
	end
	End([End])
	
	Start --> meson --> build_xxx --> |ninja|Target --> End

# meson 0.53 在 cross 時會出問題，請不要使用
# upgrade meson to 0.63
$ pip3 install meson==0.63

1.4. GN (Generate Ninja)

GN is a meta-build system that generates build files for Ninja.

對於老古板的我，擁有 make 和 Shellscript 就已經很滿足了，而且也很夠用。而使用 GN 也只是要處理 Open-source 附加需要的工具。

學習另一套構建工具，只會佔用開發時間，就算號稱編譯時的神速，也是九牛一毛。另外如 meson 時所提及的，在混合編譯環境下，這些構建工具反而是阻礙。所以在你還沒把現有的專案轉至這些構建工具，請三思而後行。

連安裝都很麻煩，請確定真的要用。

所有 .gn、BUILD.gn 都要用 space 來縮排。

gn 建構後，檔案無法從 output 中 copy 出來，所以沒有 ninja install。

排除官方的 guide，市面上可找到的說明或範例，少！而且不精確的地方都跟官網一樣。

$ sudo apt install -y ninja-build
$ ninja --version
1.10.0

# 自編
$ sudo apt install -y clang
$ clang --version
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ git clone https://gn.googlesource.com/gn
$ cd gn
$ python build/gen.py
$ ninja -C out
$ sudo cp out/gn /usr/bin
$ sudo cp out/gn_unittests /usr/bin
$ gn --version
2124 (e4702d740906)

flowchart LR
	Start([Start])
	subgraph GN[GN]
		direction LR
		.gn[00 - .gn]
		BUILD.gn[02 - BUILD.gn]
		subgraph gnX[./gnX]
			direction LR
			BUILD.gn-gnX[03 - BUILD.gn]
			BUILDCONFIG.gn[01 - BUILDCONFIG.gn]
			subgraph toolchain[./gnX/toolchain]
				BUILD.gn-toolchain[03 - BUILD.gn]
			end
		end
		subgraph cCaller[./cppTest]
			BUILD.gn-cCaller[03 - BUILD.gn]
		end
		.gn --> BUILDCONFIG.gn --> BUILD.gn 
	end
	End([End])
	
	environment[environment variable]
	style environment fill:#bbf,color:#000000,stroke:#f66,stroke-width:4px,stroke-dasharray: 5 2

	Start --> GN --> build_xxx --> |ninja|Target --> End
	GN -..- environment

2. Depend on

3. Current Status

4. Build

flowchart TD
	subgraph helloworld
		helloworld.c
	end
	subgraph pipe2
		pipe2.c
	end
	subgraph helloworld-123
		helloworld-123.c
		subgraph libhelloworld.so
			helloworld_dbg.c
		end
	end

4.1. Native-Compilation

A. make

$ ./build-make.sh distclean
$ ./build-make.sh build
$ tree install/
install/
├── bin
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    ├── libhelloworld.so -> libhelloworld.so.0
    ├── libhelloworld.so.0 -> libhelloworld.so.0.0.1
    └── libhelloworld.so.0.0.1

3 directories, 7 files

大致的命令如下

$ . confs/simple_x86.conf
$ (make )
$ (make install)

B. cmake & make

$ ./build-cmake.sh distclean
$ ./build-cmake.sh build
$ tree install/
install/
├── bin
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    ├── libhelloworld.so -> libhelloworld.so.0
    ├── libhelloworld.so.0 -> libhelloworld.so.0.0.1
    └── libhelloworld.so.0.0.1

3 directories, 7 files

$ ll install_Cpack/
total 80
drwxrwxr-x  3 lanka lanka  4096 十一 20 10:11 ./
drwxrwxr-x 12 lanka lanka  4096 十一 20 10:11 ../
drwxrwxr-x  3 lanka lanka  4096 十一 20 10:06 _CPack_Packages/
-rw-rw-r--  1 lanka lanka 18578 十一 20 10:11 helloworld-123-0.0.1-Linux.deb
-rw-rw-r--  1 lanka lanka 17856 十一 20 10:11 helloworld-123-0.0.1-Linux.tar.gz
-rw-rw-r--  1 lanka lanka 24714 十一 20 10:11 helloworld-123-0.0.1-Linux.zip

大致的命令如下

$ . confs/simple_x86.conf
$ (mkdir -p build_xxx)
$ (cd build_xxx; cmake -DCMAKE_INSTALL_PREFIX=/work/codebase/lankahsu520-gitlab/helloworld/install -DCMAKE_TOOLCHAIN_FILE=/work/codebase/lankahsu520-gitlab/helloworld/cmake/build_x86.cmake  ..)
$ (cd build_xxx; make )
$ (cd build_xxx; make install)
$ (cd build_xxx; make package)

C. meson & ninja

$ ./build-meson.sh distclean
$ ./build-meson.sh build
$ tree install/
install/
├── bin
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    ├── libhelloworld_dbg.so -> libhelloworld_dbg.so.0
    ├── libhelloworld_dbg.so.0 -> libhelloworld_dbg.so.0.0.1
    └── libhelloworld_dbg.so.0.0.1

3 directories, 7 files

大致的命令如下

$ . confs/simple_x86.conf
$ (mkdir -p build_xxx)
$ (cp -vf /work/codebase/lankahsu520-gitlab/helloworld/meson_public/meson_options.txt /work/codebase/lankahsu520-gitlab/helloworld/meson_options.txt)
$ (cp -vf /work/codebase/lankahsu520/makeXcmakeXmesonXgn/meson_public/build_x86.meson /work/codebase/lankahsu520/makeXcmakeXmesonXgn/build.meson)
$ (meson build_xxx --prefix /work/codebase/lankahsu520/helloworld/install --cross-file /work/codebase/lankahsu520/helloworld/build.meson)
$ (ninja  -C build_xxx)
$ (ninja  -C build_xxx install)

D. GN

$ ./build-gn.sh distclean
$ ./build-gn.sh build
$ tree install/
install/
├── bin
│   ├── cppCaller
│   ├── cppHelloWorldv2
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    └── libhelloworld.so

3 directories, 7 file

大致的命令如下

$ . confs/simple_x86.conf
$ (mkdir -p build_xxx)
$ (gn gen -C build_xxx)
$ (ninja -v -C build_xxx)
$ (mkdir -p /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/bin; cp -avr build_xxx/bin/* /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/bin)
$ (mkdir -p /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/include; cp -avr build_xxx/include/* /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/include)
$ (mkdir -p /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/lib; cp -avr build_xxx/lib/* /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/lib)

4.2. Cross-Compilation (aarch64)

Please install aarch64-buildroot-linux-gnu_sdk-buildroot.tar.gz into your system.

You can check helper_Buildroot-RaspberryPi3.md - Buildroot Raspberry Pi 3 helper,

2.2. To Generate Toolchain.

A. make

$ ./build-make.sh distclean
$ ./build-make.sh build aarch64
$ tree install/
install/
├── bin
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    ├── libhelloworld.so -> libhelloworld.so.0
    ├── libhelloworld.so.0 -> libhelloworld.so.0.0.1
    └── libhelloworld.so.0.0.1

3 directories, 7 files

$ file install/bin/helloworld
install/bin/helloworld: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 5.10.0, stripped

大致的命令如下

$ . confs/simple-aarch64.conf
$ (make )
$ (make install)

B. cmake & make

$ ./build-cmake.sh distclean
$ ./build-cmake.sh build aarch64
$ tree install/
install/
├── bin
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    ├── libhelloworld.so -> libhelloworld.so.0
    ├── libhelloworld.so.0 -> libhelloworld.so.0.0.1
    └── libhelloworld.so.0.0.1

3 directories, 7 files

$ ll install_Cpack/
total 68
drwxrwxr-x  3 lanka lanka  4096 十一 20 10:22 ./
drwxrwxr-x 12 lanka lanka  4096 十一 20 10:22 ../
drwxrwxr-x  3 lanka lanka  4096 十一 20 10:22 _CPack_Packages/
-rw-rw-r--  1 lanka lanka 16336 十一 20 10:22 helloworld-123-0.0.1-Linux.deb
-rw-rw-r--  1 lanka lanka 15677 十一 20 10:22 helloworld-123-0.0.1-Linux.tar.gz
-rw-rw-r--  1 lanka lanka 21736 十一 20 10:22 helloworld-123-0.0.1-Linux.zip

$ file install/bin/helloworld
install/bin/helloworld: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 5.10.0, with debug_info, not stripped

大致的命令如下

$ . confs/simple-aarch64.conf
$ (mkdir -p build_xxx)
$ (cd build_xxx; cmake -DCMAKE_INSTALL_PREFIX=/work/codebase/lankahsu520/makeXcmakeXmesonXgn/install -DCMAKE_TOOLCHAIN_FILE=/work/codebase/lankahsu520/makeXcmakeXmesonXgn/cmake/build_aarch64.cmake  ..)
$ (cd  build_xxx; make )
$ (cd  build_xxx; make install)
$ (cd build_xxx; make package)

C. meson & ninja

$ ./build-meson.sh distclean
$ ./build-meson.sh build aarch64
$ tree install/
install/
├── bin
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    ├── libhelloworld_dbg.so -> libhelloworld_dbg.so.0
    ├── libhelloworld_dbg.so.0 -> libhelloworld_dbg.so.0.0.1
    └── libhelloworld_dbg.so.0.0.1

3 directories, 7 files

$ file install/bin/helloworld
install/bin/helloworld: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 5.10.0, with debug_info, not stripped

大致的命令如下

$ . confs/simple_aarch64.conf
$ (mkdir -p build_xxx)
$ (cp -vf /work/codebase/lankahsu520/makeXcmakeXmesonXgn/meson_public/meson_options.txt /work/codebase/lankahsu520/makeXcmakeXmesonXgn/meson_options.txt)
$ (cp -vf /work/codebase/lankahsu520/makeXcmakeXmesonXgn/meson_public/build_aarch64.meson /work/codebase/lankahsu520/makeXcmakeXmesonXgn/build.meson)
$ (meson build_xxx --prefix /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install --cross-file /work/codebase/lankahsu520/makeXcmakeXmesonXgn/build.meson)
$ (ninja  -C build_xxx)
$ (ninja  -C build_xxx install)

D. GN

$ ./build-gn.sh distclean
$ ./build-gn.sh build aarch64
$ tree install/
install
├── bin
│   ├── cppCaller
│   ├── cppHelloWorldv2
│   ├── helloworld
│   ├── helloworld-123
│   └── pipe2
├── include
│   └── helloworld_dbg.h
└── lib
    └── libhelloworld.so

3 directories, 7 files

$ file install/bin/helloworld
install/bin/helloworld: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 5.10.0, with debug_info, not stripped

大致的命令如下

$ . confs/simple_aarch64.conf
$ (mkdir -p build_xxx)
$ (gn gen -C build_xxx)
$ (ninja -v -C build_xxx)
$ (mkdir -p /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/bin; cp -avr build_xxx/bin/* /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/bin)
$ (mkdir -p /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/include; cp -avr build_xxx/include/* /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/include)
$ (mkdir -p /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/lib; cp -avr build_xxx/lib/* /work/codebase/lankahsu520/makeXcmakeXmesonXgn/install/lib)

4.3. Cross-Compilation (i486)

只要參數換成 i486，其它操作相同。

雖然 x86_64 能向下相容，gcc -m32也能編譯出 32-Bit，但還是特別把 i486 當成 Cross。因為32-Bit 和 64-Bit 有很大的差異，另外對應的作業系統也相當的老舊，那怕那一天拿到一台10年前的電腦，也能有所應付。

A. make

$ ./build-make.sh build i486

B. cmake & make

$ ./build-cmake.sh build i486

C. meson & ninja

$ ./build-meson.sh build aarch64

D. GN

$ ./build-gn.sh build aarch64

5. Example or Usage

6. Documentation

Run an example and read it.

Appendix

I. Study

I.1. Meson

A. The Meson Build system

I.2. CMake

A. An Introduction to Modern CMake

B. CMake Tutorial

I.3. GN

參考的範例很少，官網

A. GN Quick Start guide

這是很失敗的 guide，短短一篇文章，在對 gn 還沒有一定的熟悉下，是完全不知其所道。

舉例，如在章節 Passing build arguments，
gn args out/my_build
照著指示操作，新增了 args - is_debug，但是呢 ? 怎麼用 ? 而且 "gn args --list" 也沒有相應的資料，總之從一開始到放棄只要10分鐘。

這邊告訴各位，沒有在 BUILDCONFIG.gn 先宣告 is_debug，之後你在編譯目錄 out/my_build 修改也是沒用的。

B. GN Reference

C. How GN handles cross-compiling

I.4. Check if a Library Is 32-Bit or 64-Bit

A. objdump

$ objdump -f  build_xxx/libhelloworld.so

build_xxx/libhelloworld.so:     file format elf64-x86-64
architecture: i386:x86-64, flags 0x00000150:
HAS_SYMS, DYNAMIC, D_PAGED
start address 0x0000000000001040

$ objdump -f  build_xxx/libhelloworld.a
In archive build_xxx/libhelloworld.a:

helloworld_dbg.c.o:     file format elf64-x86-64
architecture: i386:x86-64, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start address 0x0000000000000000

B. file

$ file build_xxx/libhelloworld.so.0.0.1
build_xxx/libhelloworld.so.0.0.1: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=a40027cd19af73a2a7e8a278b3f060dae18a594a, with debug_info, not stripped

$ file build_xxx/libhelloworld.a
build_xxx/libhelloworld.a: current ar archive

II. Debug

II.1. The variable "is_component_build" was set as a build argument but never appeared in a declare_args() block in any buildfile.

WARNING at build arg file (use "gn args <out_dir>" to edit):2:22: Build argument has no effect. is_component_build = true ^--- The variable "is_component_build" was set as a build argument but never appeared in a declare_args() block in any buildfile.

To view all possible args, run "gn args --list <out_dir>"

The build continued as if that argument was unspecified.

建議在 gnX/BUILDCONFIG.gn 新增

declare_args()
{
  is_component_build = true
  is_debug = false
}

II.2. WARNING: Running the setup command as `meson [options]` instead of `meson setup [options]` is ambiguous and deprecated.

這就是為什麼不是很喜歡用 meson；才出市沒多久，就要一直追著版本修改。

$ mkdir build_xxx

# 原本
$ meson build_xxx
# 換成
$ meson setup build_xxx
$ meson setup --reconfigure build_xxx

Author

Created and designed by Lanka Hsu.

License

makeXcmakeXmesonXgn is available under the BSD-3-Clause license. See the LICENSE file for more info.

Name		Name	Last commit message	Last commit date
Latest commit History 30 Commits
Kconfig-123		Kconfig-123
bin		bin
cmake		cmake
confs		confs
cppTest		cppTest
gnX		gnX
meson_public		meson_public
.gn		.gn
BUILD.gn		BUILD.gn
CMakeLists.txt		CMakeLists.txt
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
build-cmake.sh		build-cmake.sh
build-gn.sh		build-gn.sh
build-make.sh		build-make.sh
build-meson.sh		build-meson.sh
helloworld-123.c		helloworld-123.c
helloworld.c		helloworld.c
helloworld.h		helloworld.h
helloworld_dbg.c		helloworld_dbg.c
helloworld_dbg.h		helloworld_dbg.h
meson.build		meson.build
pipe2.c		pipe2.c
test.mk		test.mk

License

lankahsu520/makeXcmakeXmesonXgn

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Latest commit

History

Repository files navigation

1. Overview

1.1. make

1.2. cmake

1.3. meson

1.4. GN (Generate Ninja)

2. Depend on

3. Current Status

4. Build

4.1. Native-Compilation

A. make

B. cmake & make

C. meson & ninja

D. GN

4.2. Cross-Compilation (aarch64)

A. make

B. cmake & make

C. meson & ninja

D. GN

4.3. Cross-Compilation (i486)

A. make

B. cmake & make

C. meson & ninja

D. GN

5. Example or Usage

6. Documentation

Appendix

I. Study

I.1. Meson

A. The Meson Build system

I.2. CMake

A. An Introduction to Modern CMake

B. CMake Tutorial

I.3. GN

A. GN Quick Start guide

B. GN Reference

C. How GN handles cross-compiling

I.4. Check if a Library Is 32-Bit or 64-Bit

A. objdump

B. file

II. Debug

II.1. The variable "is_component_build" was set as a build argument but never appeared in a declare_args() block in any buildfile.

II.2. WARNING: Running the setup command as meson [options] instead of meson setup [options] is ambiguous and deprecated.

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II.2. WARNING: Running the setup command as `meson [options]` instead of `meson setup [options]` is ambiguous and deprecated.

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