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96 lines
3.0 KiB
96 lines
3.0 KiB
# Adding a Version Number and Configured Header File #
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The first feature we will add is to provide our executable and project with a
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version number. While we could do this exclusively in the source code, using
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CMakeLists provides more flexibility.
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To add a version number we modify the CMakeLists file as follows:
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cmake_minimum_required(VERSION 3.3)
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project(Tutorial)
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# the version number.
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set(Tutorial_VERSION_MAJOR 1)
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set(Tutorial_VERSION_MINOR 0)
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# configure a header file to pass some of the CMake settings
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# to the source code
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configure_file(
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"${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
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"${PROJECT_BINARY_DIR}/TutorialConfig.h"
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)
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# add the executable
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add_executable(Tutorial tutorial.cxx)
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# add the binary tree to the search path for include files
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# so that we will find TutorialConfig.h
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target_include_directories(Tutorial PUBLIC
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"${PROJECT_BINARY_DIR}"
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)
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We then create a TutorialConfig.h.in file in the source tree with the
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following contents:
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// the configured options and settings for Tutorial
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#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
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#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@
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When CMake configures this header file the values for @Tutorial_VERSION_MAJOR@
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and @Tutorial_VERSION_MINOR@ will be replaced by the values from the CMakeLists
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file. Next we modify tutorial.cxx to include the configured header file and to
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make use of the version numbers. The resulting source code is listed below.
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// A simple program that computes the square root of a number
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#include <cmath>
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#include <iostream>
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#include <string>
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#include <sstream>
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#include "TutorialConfig.h"
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int main (int argc, char *argv[])
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{
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if (argc < 2) {
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std::cout << argv[0] << " Version "
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<< Tutorial_VERSION_MAJOR << "." << Tutorial_VERSION_MINOR
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<< std::endl;
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std::cout << "Usage: " << argv[0] << " number" << std::endl;
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return 1;
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}
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double inputValue = atof(argv[1]);
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double outputValue = sqrt(inputValue);
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std::cout << "The square root of "
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<< inputValue << " is " << outputValue << std::endl;
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return 0;
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}
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# Adding C++11 support #
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Let's add some C++11 features to our project. We will need to explicitly state
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in the CMake code that it should use the correct flags. The easiest way to
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enable C++11 support for CMake is by using the CMAKE_CXX_STANDARD
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and CMAKE_CXX_STANDARD_REQUIRED variables.
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First, replace `atof` with `std::stod` in tutorial.cxx.
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Then, add the CMAKE_CXX_STANDARD and CMAKE_CXX_STANDARD_REQUIRED variables to
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the CMakeLists file. The STANADARD value should be set to 11, and REQUIRED
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should be set to True.
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# Build and Test #
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Run cmake or cmake-gui to configure the project and then build it with your
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chosen build tool
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cd to the directory where Tutorial was built (likely the make directory or
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a Debug or Release build configuration subdirectory) and run these commands:
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Tutorial 4294967296
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Tutorial 10
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Tutorial
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