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Представьте, что вы стажер в компании "Formatter Inc.".

Задание 1

Вам поручили перейти на систему автоматизированной сборки CMake. Исходные файлы находятся в директории formatter_lib. В этой директории находятся файлы для статической библиотеки formatter. Создайте CMakeList.txt в директории formatter_lib, с помощью которого можно будет собирать статическую библиотеку formatter.

$ cd formatter_lib
$ cat >> CMakeLists.txt << EOF
cmake_minimum_required(VERSION 3.4)
project(formatter_lib)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
add_library(formatter_lib STATIC ${CMAKE_CURRENT_SOURCE_DIR}/formatter.cpp)
EOF
$ cmake -B build
-- The C compiler identification is GNU 11.4.0
-- The CXX compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/formatter_lib/build
$ cmake --build build
[ 50%] Building CXX object CMakeFiles/formatter_lib.dir/formatter.cpp.o
[100%] Linking CXX static library libformatter_lib.a
[100%] Built target formatter_lib

Задание 2

У компании "Formatter Inc." есть перспективная библиотека, которая является расширением предыдущей библиотеки. Т.к. вы уже овладели навыком созданием CMakeList.txt для статической библиотеки formatter, ваш руководитель поручает заняться созданием CMakeList.txt для библиотеки formatter_ex, которая в свою очередь использует библиотеку formatter.

$ cat >> CMakeLists.txt << EOF
> cmake_minimum_required(VERSION 3.4)
> project(formatter_ex_lib)
> set(CMAKE_CXX_STANDARD 11)
> set(CMAKE_CXX_STANDARD_REQUIRED ON)
> add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../formatter_lib formatter_lib_dir)
> add_library(formatter_ex_lib STATIC ${CMAKE_CURRENT_SOURCE_DIR}/formatter_ex.cpp)
> target_include_directories(formatter_ex_lib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../formatter_lib)
> target_link_libraries(formatter_ex_lib formatter_lib)
> EOF
$ cmake -B build
-- The C compiler identification is GNU 11.4.0
-- The CXX compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/formatter_ex_lib/build
$ cmake --build build
[ 25%] Building CXX object formatter_lib_dir/CMakeFiles/formatter_lib.dir/formatter.cpp.o
[ 50%] Linking CXX static library libformatter_lib.a
[ 50%] Built target formatter_lib
[ 75%] Building CXX object CMakeFiles/formatter_ex_lib.dir/formatter_ex.cpp.o
[100%] Linking CXX static library libformatter_ex_lib.a
[100%] Built target formatter_ex_lib

Задание 3

Конечно же ваша компания предоставляет примеры использования своих библиотек. Чтобы продемонстрировать как работать с библиотекой formatter_ex, вам необходимо создать два CMakeList.txt для двух простых приложений:

  • hello_world, которое использует библиотеку formatter_ex;
  • solver, приложение которое испольует статические библиотеки formatter_ex и solver_lib.
$ cat >> CMakeLists.txt << EOF
cmake_minimum_required(VERSION 3.4)
project(hello_world)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../formatter_ex_lib formatter_ex_lib_dir)
add_executable(hello_world ${CMAKE_CURRENT_SOURCE_DIR}/hello_world.cpp)
target_include_directories(hello_world PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../formatter_ex_lib)
target_link_libraries(hello_world formatter_ex_lib)
EOF
$ cmake -B build
-- The C compiler identification is GNU 11.4.0
-- The CXX compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/hello_world_application/build
$ cmake --build build
[ 16%] Building CXX object formatter_ex_lib_dir/formatter_lib_dir/CMakeFiles/formatter_lib.dir/formatter.cpp.o
[ 33%] Linking CXX static library libformatter_lib.a
[ 33%] Built target formatter_lib
[ 50%] Building CXX object formatter_ex_lib_dir/CMakeFiles/formatter_ex_lib.dir/formatter_ex.cpp.o
[ 66%] Linking CXX static library libformatter_ex_lib.a
[ 66%] Built target formatter_ex_lib
[ 83%] Building CXX object CMakeFiles/hello_world.dir/hello_world.cpp.o
[100%] Linking CXX executable hello_world
[100%] Built target hello_world
$ build/hello_world
-------------------------
hello, world!
-------------------------

в папке solver_lib:

$ cat >> CMakeLists.txt << EOF
cmake_minimum_required(VERSION 3.4)
project(solver_lib)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
add_library(solver_lib STATIC ${CMAKE_CURRENT_SOURCE_DIR}/solver.cpp)
EOF
$ cmake -B build
$ cmake -B build
-- The C compiler identification is GNU 11.4.0
-- The CXX compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/solver_lib/build
$ cmake --build build
[ 50%] Building CXX object CMakeFiles/solver_lib.dir/solver.cpp.o
/home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/solver_lib/solver.cpp: In function ‘void solve(float, float, float, float&, float&)’:
/home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/solver_lib/solver.cpp:14:21: error: ‘sqrtf’ is not a member of ‘std’; did you mean ‘strtof’?
   14 |     x1 = (-b - std::sqrtf(d)) / (2 * a);
      |                     ^~~~~
      |                     strtof
/home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/solver_lib/solver.cpp:15:21: error: ‘sqrtf’ is not a member of ‘std’; did you mean ‘strtof’?
   15 |     x2 = (-b + std::sqrtf(d)) / (2 * a);
      |                     ^~~~~
      |                     strtof
gmake[2]: *** [CMakeFiles/solver_lib.dir/build.make:76: CMakeFiles/solver_lib.dir/solver.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/solver_lib.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2
$ vim solver.cpp
#include "solver.h"

#include <stdexcept>
#include <cmath>

void solve(float a, float b, float c, float& x1, float& x2)
{
    float d = (b * b) - (4 * a * c);

    if (d < 0)
    {
        throw std::logic_error{"error: discriminant < 0"};
    }

    x1 = (-b - sqrtf(d)) / (2 * a);
    x2 = (-b + sqrtf(d)) / (2 * a);
}
$ cmake -B build
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/solver_lib/build
$ cmake --build build
Consolidate compiler generated dependencies of target solver_lib
[ 50%] Building CXX object CMakeFiles/solver_lib.dir/solver.cpp.o
[100%] Linking CXX static library libsolver_lib.a
[100%] Built target solver_lib

в папке solver_application:

cat >> CMakeLists.txt << EOF
cmake_minimum_required(VERSION 3.4)
project(solver)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../formatter_ex_lib formatter_ex_lib_dir)
add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../solver_lib solver_lib_dir)
add_executable(solver ${CMAKE_CURRENT_SOURCE_DIR}/equation.cpp)
target_include_directories(solver PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../formatter_ex_lib ${CMAKE_CURRENT_SOURCE_DIR}/../solver_lib)
target_link_libraries(solver formatter_ex_lib solver_lib)
EOF
$ cmake -B build
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vboxuser/Desktop/Software9-1/workspace/labs/lab03/solver_application/build
$ cmake --build build
[ 12%] Building CXX object solver_lib_dir/CMakeFiles/solver_lib.dir/solver.cpp.o
[ 25%] Linking CXX static library libsolver_lib.a
[ 25%] Built target solver_lib
[ 37%] Building CXX object formatter_ex_lib_dir/formatter_lib_dir/CMakeFiles/formatter_lib.dir/formatter.cpp.o
[ 50%] Linking CXX static library libformatter_lib.a
[ 50%] Built target formatter_lib
[ 62%] Building CXX object formatter_ex_lib_dir/CMakeFiles/formatter_ex_lib.dir/formatter_ex.cpp.o
[ 75%] Linking CXX static library libformatter_ex_lib.a
[ 75%] Built target formatter_ex_lib
[ 87%] Building CXX object CMakeFiles/solver.dir/equation.cpp.o
[100%] Linking CXX executable solver
[100%] Built target solver
$ build/solver
1
2
-10
-------------------------
x1 = -4.316625
-------------------------
-------------------------
x2 = 2.316625
-------------------------
Copyright (c) 2015-2021 The ISC Authors

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