构建GUI应用程序找不到#include_next“<....h>”

Question

我正在尝试使用

Qt

来设计我的应用程序（它将利用我的库），但我从

Qt

收到错误。我首先通过

Qt

安装

msys2

，如下所示：

pacman -S mingw-w64-ucrt-x86_64-qt6

然后我创建了一个

CMakeLists.txt

，如下所示：

cmake_minimum_required(VERSION 3.16)
project(test VERSION 1.0.0 LANGUAGES CXX)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY bin)
set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "C:\\msys64\\ucrt64\\include")
set(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} "C:\\msys64\\ucrt64\\lib")

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 REQUIRED COMPONENTS Widgets)
qt_standard_project_setup()

qt_add_executable(
  app
    app/main.cpp
)

target_link_libraries(
  app
  PRIVATE
    Qt6::Widgets
)

set_target_properties(app PROPERTIES
    WIN32_EXECUTABLE ON
)

然后创建

app/main.cpp

文件：

#include <QApplication>

int main(int argc, char **argv) {
  QApplication app(argc, argv);
  return app.exec();
}

但是，当我构建代码时，出现以下错误：

[build] In file included from C:/msys64/ucrt64/include/qt6/QtCore/qnumeric.h:15,
[build]                  from C:/msys64/ucrt64/include/qt6/QtCore/qglobal.h:62,
[build]                  from C:/msys64/ucrt64/include/qt6/QtGui/qtguiglobal.h:7,
[build]                  from C:/msys64/ucrt64/include/qt6/QtWidgets/qtwidgetsglobal.h:7,
[build]                  from C:/msys64/ucrt64/include/qt6/QtWidgets/qapplication.h:7,
[build]                  from C:/msys64/ucrt64/include/qt6/QtWidgets/QApplication:1,
[build]                  from C:\Users\untun\Documents\vscode\draw\draw\app\main.cpp:1:
[build] C:/msys64/ucrt64/include/c++/13.2.0/cmath:47:15: fatal error: math.h: No such file or directory
[build]    47 | #include_next <math.h>
[build]       |               ^~~~~~~~

关于我为什么会收到此错误有什么想法吗？我是不是没有安装所有东西？

编辑

我现在也尝试使用 GTK 和 git 出现相同的错误，但包含不同的内容：

pacman -S mingw-w64-ucrt-x86_64-gtk4

使用这个cmake：

cmake_minimum_required(VERSION 3.16)
project(draw VERSION 1.0.0 LANGUAGES CXX)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY bin)
set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK4 REQUIRED IMPORTED_TARGET gtk4)

add_executable(app main.cpp)

target_link_libraries(
  app
  PRIVATE
    PkgConfig::GTK4
)

还有这个cpp文件：

#include <gtk/gtk.h>

using namespace std;

static void activate(GtkApplication *app) {
  GtkWidget *window = gtk_application_window_new(app);
  gtk_window_set_title(GTK_WINDOW(window), "Window");
  gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
}

int main(int argc, char *argv[]) {
  GtkApplication *app = gtk_application_new("com.example.GtkApplication",
                                            G_APPLICATION_FLAGS_NONE);
  return g_application_run(G_APPLICATION(app), argc, argv);
}

导致此错误：

[build] In file included from C:/msys64/ucrt64/include/c++/13.2.0/ext/string_conversions.h:43,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/bits/basic_string.h:4097,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/string:54,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/bits/locale_classes.h:40,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/bits/ios_base.h:41,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/ios:44,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/ostream:40,
[build]                  from C:/msys64/ucrt64/include/c++/13.2.0/iostream:41,
[build]                  from C:\Users\untun\Documents\vscode\draw\draw\src\app\main.cpp:3:
[build] C:/msys64/ucrt64/include/c++/13.2.0/cstdlib:79:15: fatal error: stdlib.h: No such file or directory
[build]    79 | #include_next <stdlib.h>
[build]       |               ^~~~~~~~~~

Answer 1

我可以通过将以下内容添加到我的

CMakeLists.txt

文件中来解决此问题：

include_directories(
  BEFORE
  SYSTEM
    "C:\\msys64\\ucrt64\\include\\c++\\13.2.0"
)