CMake-tutorial(原文)

其他 2019-04-29 22:18:05 阅读次数: 0

CMake-tutorial(原文)

这份渐进式的教程涵盖了 CMake 帮助处理的一些常见的构建问题。许多议题已经在《Mastering CMake》中作为独立的话题介绍过，但是了解它们是如何在示例项目中结合在一起的将非常有帮助。你可以在 CMake 源码中的 Tests/Tutorial 文件夹找到这份教程，每一步的内容都放置在各自的子文件夹中。

https://github.com/Campanula/CMake-tutorial

https://github.com/atilaneves/cmake-ide

ttroy50/cmake-examples

https://github.com/ttroy50/cmake-examples/tree/master/01-basic

一个基本的出发点 (Step1)

最简单的项目是从源代码文件中构建一个可执行文件，CMakeLists.txt 文件仅需要两行，这将作为我们教程的起点，内容如下：

cmake_minimum_required (VERSION 2.6)
project (Tutorial)
add_executable(Tutorial tutorial.cxx)

文件中的命令支持大写、小写或者混合使用，这个例子中的命令使用小写。tutorial.cxx 用于计算一个数的平方根，源码的第一版非常简单：

// 计算一个数的平方根
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main (int argc, char *argv[])
{
  if (argc < 2)
    {
    fprintf(stdout,"Usage: %s number\n",argv[0]);
    return 1;
    }
  double inputValue = atof(argv[1]);
  double outputValue = sqrt(inputValue);
  fprintf(stdout,"The square root of %g is %g\n",
          inputValue, outputValue);
  return 0;
}

添加一个版本号并配置头文件

你可以直接在源代码中添加版本号，但在 CMakeLists.txt 文件中提供版本号将会更加灵活，我们将文件修改如下：

cmake_minimum_required (VERSION 2.6)
project (Tutorial)
# 版本号 1.0
set (Tutorial_VERSION_MAJOR 1)
set (Tutorial_VERSION_MINOR 0)

# 配置一个头文件将一些 CMake 设置传入到源代码中
# 以 TutorialConfig.h.in 为模版，替换相关变量
# 以生成 TutorialConfig.h
configure_file (
  "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
  "${PROJECT_BINARY_DIR}/TutorialConfig.h"
  )

# 将构建目录添加到 include 的搜索路径中以便找到
# TutorialConfig.h 文件
include_directories("${PROJECT_BINARY_DIR}")

# 添加可执行文件
add_executable(Tutorial tutorial.cxx)

因为配置文件将会写入到构建目录中，所以我们将这个目录添加到包含文件的搜索路径中。在源代码中添加 TutorialConfig.h.in 文件：

// the configured options and settings for Tutorial
#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@

当 CMake 生成这个头文件时，@Tutorial_VERSION_MAJOR@ 和 @Tutorial_VERSION_MINOR@ 的值将会由 CMakeLists.txt 中对应的值替换。接下来我们将头文件包含到 tutorial.cxx 中并且使用这个版本号，代码如下：

// A simple program that computes the square root of a number
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "TutorialConfig.h"

int main (int argc, char *argv[])
{
  if (argc < 2)
    {
    fprintf(stdout,"%s Version %d.%d\n",
            argv[0],
            Tutorial_VERSION_MAJOR,
            Tutorial_VERSION_MINOR);
    fprintf(stdout,"Usage: %s number\n",argv[0]);
    return 1;
    }
  double inputValue = atof(argv[1]);
  double outputValue = sqrt(inputValue);
  fprintf(stdout,"The square root of %g is %g\n",
          inputValue, outputValue);
  return 0;
}

主要的改变是包含了头文件并且在使用方法信息中打印了版本号。

添加一个库 (Step 2)

现在我们要在项目中添加一个库，这个库将会包含我们自己的计算平方根的实现。可执行文件将可以使用这个库，而不是使用编译器提供的平方根标准方法。本教程中将这个库放到名为 MathFunctions 的子文件夹中，这个子文件夹需要包含一个 CMakeLists.txt 文件，文件中有如下一行：

add_library(MathFunctions mysqrt.cxx)

mysqrt.cxx 文件中有一个叫做 mysqrt 的函数，它提供与编译器的 sqrt 函数相同的功能。我们在顶层的 CMakeLists.txt 中添加一个 add_subdirectory 调用以构建这个库。为了找到 MathFunctions/MathFunctions.h 头文件中的函数原型，我们添加另一条包含路径。最后一个改动是将这个库添加到可执行文件中。顶层 CMakeLists.txt 文件中添加的最新几行如下：

include_directories ("${PROJECT_SOURCE_DIR}/MathFunctions")
add_subdirectory (MathFunctions)

# add the executable
add_executable (Tutorial tutorial.cxx)
target_link_libraries (Tutorial MathFunctions)

考虑一下将这个库设计为可选的，本教程中这样做也许是不必要的，但是当使用更大的库或者第三方的库时你也许会用到。第一步是在顶层的 CMakeLists.txt 中添加一个选择：

# 是否使用我们自己的函数？
option (USE_MYMATH
        "Use tutorial provided math implementation" ON)

CMake GUI 中将会显示一个 ON 的默认值，用户可以按需更改。这个设置将会被缓存，这样在每次对这个项目运行 CMake 时用户不需要再次设置。接下来的更改是将 MathFunctions 库的构建和连接设置为可选的，我们在顶层 CMakeLists.txt 的最后修改如下：

# add the MathFunctions library?
if (USE_MYMATH)
  include_directories ("${PROJECT_SOURCE_DIR}/MathFunctions")
  add_subdirectory (MathFunctions)
  set (EXTRA_LIBS ${EXTRA_LIBS} MathFunctions)
endif (USE_MYMATH)

# add the executable
add_executable (Tutorial tutorial.cxx)
target_link_libraries (Tutorial  ${EXTRA_LIBS})

这将根据 USE_MYMATH 的设置来决定是否编译并使用 MathFunctions 库。注意这里使用了一个 EXTRA_LIBS 变量来收集任何可选的库，以在之后链接到可执行文件中。对有许多可选组件的项目，这是一种保持其整洁的常用方法。相应的源代码更改如下：

/ A simple program that computes the square root of a number
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "TutorialConfig.h"
#ifdef USE_MYMATH
#include "MathFunctions.h"
#endif

int main (int argc, char *argv[])
{
  if (argc < 2)
    {
    fprintf(stdout,"%s Version %d.%d\n", argv[0],
            Tutorial_VERSION_MAJOR,
            Tutorial_VERSION_MINOR);
    fprintf(stdout,"Usage: %s number\n",argv[0]);
    return 1;
    }

  double inputValue = atof(argv[1]);

#ifdef USE_MYMATH
  double outputValue = mysqrt(inputValue);
#else
  double outputValue = sqrt(inputValue);
#endif

  fprintf(stdout,"The square root of %g is %g\n",
          inputValue, outputValue);
  return 0;
}

在源代码中我们同样使用了 USE_MYMATH 变量。通过在 TutorialConfig.h.in 中添加如下配置，Cmake 将这个变量引入到源代码中：

#cmakedefine USE_MYMATH

安装与测试 (Step 3)

接下来我们在项目中添加安装规则和测试支持。安装规则非常直接，对于 MathFunctions 库的安装，我们在 MathFunctions 的 CMakeLists.txt 中添加如下几行：

install (TARGETS MathFunctions DESTINATION bin)
install (FILES MathFunctions.h DESTINATION include)

对于应用程序可执行文件和头文件的安装，我们在顶层的 CMakeLists.txt 中添加如下几行：

# add the install targets
install (TARGETS Tutorial DESTINATION bin)
install (FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h"
         DESTINATION include)

万事俱备，接下来你应该可以构建这个项目，然后键入 make install （或者在 IDE 中构建 INSTALL 目标），它将会安装合适的头文件，库和执行文件。CMake 的 CMAKE_INSTALL_PREFIX 变量用于决定文件安装位置的根。添加测试也是一个同样直接的过程。在顶层 CMakeLists.txt 的结尾，我们可以添加几个基础测试以判别程序是否工作正常：

include(CTest)

# does the application run
add_test (TutorialRuns Tutorial 25)

# does it sqrt of 25
add_test (TutorialComp25 Tutorial 25)
set_tests_properties (TutorialComp25 PROPERTIES PASS_REGULAR_EXPRESSION "25 is 5")

# does it handle negative numbers
add_test (TutorialNegative Tutorial -25)
set_tests_properties (TutorialNegative PROPERTIES PASS_REGULAR_EXPRESSION "-25 is 0")

# does it handle small numbers
add_test (TutorialSmall Tutorial 0.0001)
set_tests_properties (TutorialSmall PROPERTIES PASS_REGULAR_EXPRESSION "0.0001 is 0.01")

# does the usage message work?
add_test (TutorialUsage Tutorial)
set_tests_properties (TutorialUsage PROPERTIES PASS_REGULAR_EXPRESSION "Usage:.*number")

构建完成后，可以使用命令行工具 ctest 运行测试。第一个测试只是验证程序是否运行，没有段错误或其他的崩溃，并返回零值。这是一个 CTest 测试的基本形式。接下来的几个测试都使用 PASS_REGULAR_EXPRESSION 测试属性来验证测试的输出是否包含某些字符串。这样用来验证预期的计算结果，并且当参数数目不正确时打印使用信息。如果你想添加大量测试来测试不同的输入值，你可能会考虑创建如下所示的宏：

#define a macro to simplify adding tests, then use it
macro (do_test arg result)
  add_test (TutorialComp${arg} Tutorial ${arg})
  set_tests_properties (TutorialComp${arg}
    PROPERTIES PASS_REGULAR_EXPRESSION ${result})
endmacro (do_test)

# do a bunch of result based tests
do_test (25 "25 is 5")
do_test (-25 "-25 is 0")

每调用一次 do_test，根据传递的参数，都会添加一个拥有名字、输入和输出的测试。

添加系统自检 (Step 4)

接下来让我们向项目中添加一些代码，这些代码依赖的功能目标平台可能没有提供。这个例子中，我们添加的代码依赖于目标平台是否提供了对数 log 和指数 exp 函数。当然几乎所有的平台都提供了这样的函数，本教程假定它们是不常见的功能。如果平台提供了 log，那么我们可以在 mysqrt 函数中使用它计算平方根。我们首先使用顶层 CMakeLists.txt 文件中的 CheckFunctionExists.cmake 宏来测试这些功能的可用性，如下所示：

# does this system provide the log and exp functions?
include (CheckFunctionExists)
check_function_exists (log HAVE_LOG)
check_function_exists (exp HAVE_EXP)

当 CMake 在平台上发现它们时，我们在 TutorialConfig.h.in 中定义这些值：

// does the platform provide exp and log functions?
#cmakedefine HAVE_LOG
#cmakedefine HAVE_EXP

log 和 exp 的测试需要放在 configure_file 命令之前，configure_file 命令会立即使用 CMake 中的当前设置生成文件。当系统提供了这两个函数时，我们可以使用以下代码在 mysqrt 函数中提供一个基于 log 和 exp 的替代实现：

// if we have both log and exp then use them
#if defined (HAVE_LOG) && defined (HAVE_EXP)
  result = exp(log(x)*0.5);
#else // otherwise use an iterative approach
  . . .

添加生成文件和生成器 (Step 5)

在本节中，我们将展示如何将生成的源文件添加到应用程序的构建过程中。本例中，我们将会在构建过程中创建一个预先计算的平方根表，然后将这张表编译进我们的程序中。我们首先需要一个生成这张表的程序，为此我们在 MathFunctions 的子文件夹中添加一个新的名为 MakeTable.cxx 的源文件：

// A simple program that builds a sqrt table
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main (int argc, char *argv[])
{
  int i;
  double result;

  // make sure we have enough arguments
  if (argc < 2)
    {
    return 1;
    }

  // open the output file
  FILE *fout = fopen(argv[1],"w");
  if (!fout)
    {
    return 1;
    }

  // create a source file with a table of square roots
  fprintf(fout,"double sqrtTable[] = {\n");
  for (i = 0; i < 10; ++i)
    {
    result = sqrt(static_cast<double>(i));
    fprintf(fout,"%g,\n",result);
    }

  // close the table with a zero
  fprintf(fout,"0};\n");
  fclose(fout);
  return 0;
}

注意这张表会以有效的 C++ 代码的形式生成，输出文件的名字以参数的形式提供。接下来向 MathFunctions 的 CMakeLists.txt 文件中添加合适的命令以构建 MakeTable 的可执行文件，并运行它作为构建过程的一部分。需要几个命令来完成此操作，如下所示：

# first we add the executable that generates the table
add_executable(MakeTable MakeTable.cxx)

# add the command to generate the source code
add_custom_command (
  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
  DEPENDS MakeTable
  )

# add the binary tree directory to the search path for
# include files
include_directories( ${CMAKE_CURRENT_BINARY_DIR} )

# add the main library
add_library(MathFunctions mysqrt.cxx ${CMAKE_CURRENT_BINARY_DIR}/Table.h  )

首先像添加其他执行文件那样添加 MakeTable 的执行文件。然后我们添加一个自定义命令以使用 MakeTable 生成 Table.h 文件。接下来我们需要将生成的文件添加到 MathFunctions 库的源文件列表中，以让 CMake 知道 mysqrt.cxx 依赖于 Table.h 文件。我们也需要将当前的构建文件夹添加到包含文件列表中，以让 Table.h 文件可以被发现并包含到 mysqrt.cxx 中。当构建这个项目时，它会先构建 MakeTable 的执行文件，然后运行 MakeTable 生成 Table.h 文件，最后它会编译包含有 Table.h 的 mysqrt.cxx 以生成 MathFunctions 库。此时，顶层 CMakeLists.txt 文件如下所示：

cmake_minimum_required (VERSION 2.6)
project (Tutorial)
include(CTest)

# The version number.
set (Tutorial_VERSION_MAJOR 1)
set (Tutorial_VERSION_MINOR 0)

# does this system provide the log and exp functions?
include (${CMAKE_ROOT}/Modules/CheckFunctionExists.cmake)

check_function_exists (log HAVE_LOG)
check_function_exists (exp HAVE_EXP)

# should we use our own math functions
option(USE_MYMATH
  "Use tutorial provided math implementation" ON)

# configure a header file to pass some of the CMake settings
# to the source code
configure_file (
  "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
  "${PROJECT_BINARY_DIR}/TutorialConfig.h"
  )

# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
include_directories ("${PROJECT_BINARY_DIR}")

# add the MathFunctions library?
if (USE_MYMATH)
  include_directories ("${PROJECT_SOURCE_DIR}/MathFunctions")
  add_subdirectory (MathFunctions)
  set (EXTRA_LIBS ${EXTRA_LIBS} MathFunctions)
endif (USE_MYMATH)

# add the executable
add_executable (Tutorial tutorial.cxx)
target_link_libraries (Tutorial  ${EXTRA_LIBS})

# add the install targets
install (TARGETS Tutorial DESTINATION bin)
install (FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h"
         DESTINATION include)

# does the application run
add_test (TutorialRuns Tutorial 25)

# does the usage message work?
add_test (TutorialUsage Tutorial)
set_tests_properties (TutorialUsage
  PROPERTIES
  PASS_REGULAR_EXPRESSION "Usage:.*number"
  )


#define a macro to simplify adding tests
macro (do_test arg result)
  add_test (TutorialComp${arg} Tutorial ${arg})
  set_tests_properties (TutorialComp${arg}
    PROPERTIES PASS_REGULAR_EXPRESSION ${result}
    )
endmacro (do_test)

# do a bunch of result based tests
do_test (4 "4 is 2")
do_test (9 "9 is 3")
do_test (5 "5 is 2.236")
do_test (7 "7 is 2.645")
do_test (25 "25 is 5")
do_test (-25 "-25 is 0")
do_test (0.0001 "0.0001 is 0.01")

TutorialConfig.h.in 如下：

// the configured options and settings for Tutorial
#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@
#cmakedefine USE_MYMATH

// does the platform provide exp and log functions?
#cmakedefine HAVE_LOG
#cmakedefine HAVE_EXP

MathFunctions 的 CMakeLists.txt 文件如下：

# first we add the executable that generates the table
add_executable(MakeTable MakeTable.cxx)
# add the command to generate the source code
add_custom_command (
  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
  DEPENDS MakeTable
  COMMAND MakeTable ${CMAKE_CURRENT_BINARY_DIR}/Table.h
  )
# add the binary tree directory to the search path
# for include files
include_directories( ${CMAKE_CURRENT_BINARY_DIR} )

# add the main library
add_library(MathFunctions mysqrt.cxx ${CMAKE_CURRENT_BINARY_DIR}/Table.h)

install (TARGETS MathFunctions DESTINATION bin)
install (FILES MathFunctions.h DESTINATION include)

构建安装程序 (Step 6)

接下来假设我们想将我们的项目分发给其他人，以便他们可以使用它。我们希望在各种平台上提供二进制和源代码分发。这与之前的第三步有些不同，在这个例子中，我们将构建安装包以支持二进制安装和包管理功能，比如 cygwin，debian，RPMs 等。我们将会使用 CPack 来创建平台相关的安装程序。具体来说，我们需要在我们的顶层 CMakeLists.txt 文件的底部添加几行：

# build a CPack driven installer package
include (InstallRequiredSystemLibraries)
set (CPACK_RESOURCE_FILE_LICENSE
     "${CMAKE_CURRENT_SOURCE_DIR}/License.txt")
set (CPACK_PACKAGE_VERSION_MAJOR "${Tutorial_VERSION_MAJOR}")
set (CPACK_PACKAGE_VERSION_MINOR "${Tutorial_VERSION_MINOR}")
include (CPack)

我们从包含 InstallRequiredSystemLibraries 开始。该模块包含有这个项目在当前平台所需的任何运行时库。然后我们设置一些 CPack 变量指明此项目许可证和版本信息的位置。版本信息使用了本教程前面设置的变量。最后我们包含了 CPack 模块，它将使用你设置的这些变量和其他系统属性来配置安装程序。

接下来就是按照通常的方法构建项目，然后运行 CPack 命令。要构建一个二进制分发，你可以运行：

cpack --config CPackConfig.cmake

要创建一个源码分发，你可以键入：

cpack --config CPackSourceConfig.cmake

添加对仪表板的支持 (Step 7)

添加将测试结果提交给仪表板的支持非常简单。在教程之前的步骤中已经定义了一些测试，我们只需运行这些测试并且将它们提交给一个仪表板。要包括对仪表板的支持，我们将 CTest 模块包含在我们的顶层 CMakeLists.txt 文件中：

# enable dashboard scripting
include (CTest)

我们还创建一个CTestConfig.cmake文件，可以在该文件中为仪表板指定此项目的名称。

set (CTEST_PROJECT_NAME "Tutorial")

当运行 CTest 时它会读取这个文件。要创建简单的仪表板，你可以在项目中运行 CMake，然后切换目录到构建目录中运行 ctest –D Experimental. 仪表板的结构将会上传到 Kitware 的公共仪表板中（这里）。

88888888888888888888888888888888888888888

test Test for cide--flags-to-sys-includes 5 months ago
  .gitignore Cask and ert-runner for testing 5 years ago
  .travis.yml Remove useless d-apt from .travis.yml a year ago
  Cask Fix #176 - add dash as a dependency 7 months ago
  LICENSE README and LICENSE 5 years ago
  Makefile Run all tests on travis a year ago
  README.md Add MELPA badge 5 months ago
  TODO.md Updated TODO.md 5 years ago
  cmake-ide.el for older cmake versions 22 days ago

 README.md

cmake-ide

Build Status Coverage Status Melpa Status

CppCon 2015 Lightning talk on cmake-ide:

CppCon 2015 Lightning talk on cmake-ide

Introduction

cmake-ide is a package to enable IDE-like features on Emacs for CMake projects. It also supports non-CMake projects as long as a compilation database is generated out-of-band.This includes autocompletion and on-the-fly syntax checking in Emacs for CMake projects with minimal configuration. It uses other packages to do its heavy lifting, in a combination of:

cmake-ide will set variables and call functions for the installed dependent packages.

It works by running CMake in Emacs in order to obtain the necessary compiler flags to pass to the other tools. Since all the dependencies are specified in the CMake scripts, there is no need to maintain a parallel dependency tracking system for Emacs. Just ask CMake.

Features

  • Sets variables for auto-complete-clang, flycheck and others for a CMake project automagically. Hardly any configuration necessary.
  • Automatically reruns CMake when a file is saved. Great when using CMake file globs to pick up newly created files, but needs cmake-ide-build-dir to be set.
  • cmake-ide-delete-file allows you to have the same convenience when deleting files. I can't figure out a better way to do this. Obviously simply deleting the file means having to run CMake again manually for it to register the change in the list of files to be compiled.
  • If cmake-ide-build-dir is set, it is considered to be the build directory to run CMake in. Additionally, this will causecmake-ide-compile to compile the project there. It automatically detects Ninja and Make builds and sets the compile command accordingly. The command to use can be customised by setting the cmake-compile-command variable.
  • cmake-ide can make usage of rtags for finding definitions, also using clang. If (require 'rtags) is called beforecmake-ide-setup, it will automatically start the rtags server (rdm) and call rc -J to index the project files for 0-config "jump to definition" and everything else rtags offers. This only works if both rdm and rc and in the system path or if cmake-ide-rdm-executable and cmake-ide-rc-executable are customized correctly.

Build Pool Directories and Persistent Naming of Automatic Build Directories

cmake-ide can automatically create build directories for you -- either in the system's tmp-directory or under cmake-ide-build-pool-dir (if set). By default, all automatically created build directories (no matter where created) will have temporary and unique names, that will change with each new session and are thus not reusable. You can, however, by setting cmake-ide-build-pool-use-persistent-naming use a reproducible naming scheme that is based on the project's path and will not change as long as the project's path is the same. This way, you can reuse the build directory.

By using both cmake-ide-build-pool-dir and cmake-ide-build-pool-use-persistent-naming, you can fully do away with the need to configure a build directory per project with directory local variables (for example).

Non-CMake projects

Use .dir-locals.el to set the cmake-ide-project-dir and cmake-ide-build-dir variables (use absolute paths). If a file called compile_commands.json exists in cmake-ide-build-dir, it will work just as well as for CMake projects.

Installation

Install from MELPA or MELPA Stable with:

M-x package-install RET cmake-ide.

Usage

Add this to your .emacs / init.el:

(require 'rtags) ;; optional, must have rtags installed
(cmake-ide-setup)

If cmake-ide-flags-c or cmake-ide-flags-c++ are set, they will be added to ac-clang-flags and company-clang-arguments. These variables should be set. Particularly, they should contain the system include paths (e.g. '("-I/usr/include/c++/4.9.1" "..."). For a system with gcc, you can get this information by running gcc -v -xc++ /dev/null -fsyntax-only (it's the same prerequisite for auto-complete-clang to work, since that's how clang itself works).

And... that's it. It works by calling cmake and parsing the resulting JSON file with compiler flags. Set cmake-ide-build-dirto where your project is being built and you won't have to call CMake manually again (except for the first time to specify options). Best done with directory local variables.

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