如何让 Scons 中的 SConscript 知道标头位置？

Question

我正在尝试将模块添加到基于Godot 的游戏项目中。我希望使用doctest 添加单元测试。为简单起见，我将使用link above 中给出的示例。所以我创建了这个简单的文件结构：

summator/
    include/
        summator.h
    src/ 
        summator.cpp
    tests/
        doctest.h
        summator_tests.cpp
        SCsub
    config.py
    register_types.h
    register_types.cpp
    SConstruct/SCsub

Godot 需要最后四个文件。这里是SConstruct/SCsub（第二个文件名是Godot需要的，我用一个SConstruct文件单独测试）：

#!/usr/bin/env python

# import the environment provided by Godot
Import( 'env' )
# when tested in isolation, replace with following line
# env = Environment()

# add include directory to the search path 
env.Append( CPPPATH = [ '#include' ] ) # relative path

# add all cpp files so Scons can build the module
env.add_source_files( env.modules_sources, 'src/*.cpp' )
env.add_source_files( env.modules_sources, '*.cpp' )

# if tests are enabled, build them 
if env[ 'tests' ]:
    SConscript([ 'tests/SCsub' ])

接下来，summator/tests/ 中的 SConscript 应该构建测试：

#!/usr/bin/env python

Import( 'env' )

tests_env = env.Clone()

# build tests
tests = test_env.Program( 'runTest', Glob( '*.cpp' )

当我尝试运行此程序时，我收到一个错误，即找不到标头“summator.h”：

[ 99%] Compiling ==> modules/summator/tests/sumator_tests.cpp
modules/summator/tests/summator_tests.cpp:3:10: fatal error: 'summator.h' file not found
#include "summator.h"
         ^~~~~~~~~~~~~
1 error generated.
scons: *** [modules/summator/tests/summator_tests.linuxbsd.tools.64.llvm.o] Error 1
scons: building terminated because of errors.

按照我理解 scons 环境的方式，一旦我添加了路径/文件，所有 SConscript（导入环境）都可以访问它。我究竟做错了什么？这感觉应该是微不足道的，但由于某种原因它不起作用。

为了完整起见，这里是其他源文件：

// summator.h
#ifndef SUMMATOR_H
#define SUMMATOR_H

#include "core/reference.h"

class Summator : public Reference 
{
    GDCLASS( Summator, Reference );

    int count;

protected:
    static void _bind_methods();

public:
    void add( int p_value );
    void reset(); 
    int get_total() const;

    Summator();
};

#endif // SUMMATOR_H

// summator.cpp
#include "summator.h"

void Summator::add( int p_value )
{
    count += p_value;
}

void Summator::reset()
{
    count = 0;
}

int Summator::get_total() const 
{
    return count;
}

void Summator::_bind_methods()
{
    ClassDB::bind_method( D_METHOD( "add", "value" ), &Summator::add );
    ClassDB::bind_method( D_METHOD( "reset" ), &Summator::reset );
    ClassDB::bind_method( D_METHOD( "get_total" ), &Summator::get_total );
}

Summator::Summator()
{
    count = 0;
}

// summator_tests.cpp
#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
// #include "thirdparty/doctest/doctest.h"
#include "summator.h"
#include "doctest.h"

TEST_CASE( "testing the summator" )
{
    // class under test
    Summator* cut = new Summator();

    cut->add(10);
    CHECK( cut->get_total() == 10 )
    cut->add(10);
    CHECK( cut->get_total() == 20 )
    cut->add(10);
    CHECK( cut->get_total() == 30 )
    cut->reset();
    CHECK( cut->get_total() == 0 )

    // clean up 
    delete cut;
}

Answer 1

经过一些实验，我找到了一个可行的解决方案，请查看我的Github repository中的完整代码。