原因

在编译 qt-everywhere-src-5.15.7 静态的时候，遇到一个error，只能动手查方法了

错误

In file included from ../../include/QtCore/5.15.7/QtCore/private/qorderedmutexlocker_p.h:1,
                 from io/qprocess_p.h:65,
                 from io/qprocess.cpp:89:
../../include/QtCore/5.15.7/QtCore/private/../../../../../src/corelib/thread/qorderedmutexlocker_p.h: In constructor ‘QOrderedMutexLocker::QOrderedMutexLocker(QOrderedMutexLocker&&)’:
../../include/QtCore/5.15.7/QtCore/private/../../../../../src/corelib/thread/qorderedmutexlocker_p.h:95:21: error: ‘exchange’ is not a member of ‘std’
   95 |         : mtx1(std::exchange(other.mtx1, nullptr))
      |                     ^~~~~~~~
../../include/QtCore/5.15.7/QtCore/private/../../../../../src/corelib/thread/qorderedmutexlocker_p.h:96:21: error: ‘exchange’ is not a member of ‘std’
   96 |         , mtx2(std::exchange(other.mtx2, nullptr))
      |                     ^~~~~~~~
../../include/QtCore/5.15.7/QtCore/private/../../../../../src/corelib/thread/qorderedmutexlocker_p.h:97:23: error: ‘exchange’ is not a member of ‘std’
   97 |         , locked(std::exchange(other.locked, false))
      |                       ^~~~~~~~
make[3]: *** [Makefile:39413: .obj/qprocess.o] Error 1
make[3]: Leaving directory '/home/wxw/qt-everywhere-src-5.15.7/qtbase/src/corelib'

解决方法：

使用vscode或者其他编辑器，文本文件也行，打开那个报错的文件：

例如我这个：
/qt-everywhere-src-5.15.7/qtbase/src/corelib/thread/qorderedmutexlocker_p.h

打开后，根据行号，更改代码：

原来的代码

// 原来的代码
    QOrderedMutexLocker(QOrderedMutexLocker &&other) noexcept
        : mtx1(std::exchange(other.mtx1, nullptr))
        , mtx2(std::exchange(other.mtx2, nullptr))
        , locked(std::exchange(other.locked, false))
    {}

更改之后的代码

// 更改之后的代码

// 我还添加了这个头文件 不知道是否有用
// #include <stddef.h>


    QOrderedMutexLocker(QOrderedMutexLocker &&other) noexcept
        : mtx1(qExchange(other.mtx1, nullptr))
        , mtx2(qExchange(other.mtx2, nullptr))
        , locked(qExchange(other.locked, false))
    {}