Qt项目编译提示找不到math.h头文件的问题求助

各位大佬好，我最近在编译Qt项目时碰到了一个奇怪的问题，折腾了好几种方法都没解决，想请大家帮忙看看！

我最初运行的编译命令是这样的：

/usr/bin/x86_64-linux-gnu-g++-12 --sysroot=/home/mustafa/Desktop/Programming/QtProjects \
-DQT_CORE_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB \
-I/usr/include/c++/12 -I/usr/include/x86_64-linux-gnu \
-I/home/mustafa/Desktop/Programming/QtProjects/build-pcm2-Desktop-Debug/pcm2_autogen/include \
-isystem /home/mustafa/Qt/6.6.1/gcc_64/include/QtCore \
-isystem /home/mustafa/Qt/6.6.1/gcc_64/include \
-isystem /home/mustafa/Qt/6.6.1/gcc_64/mkspecs/linux-g++ \
-isystem /home/mustafa/Qt/6.6.1/gcc_64/include/QtWidgets \
-isystem /home/mustafa/Qt/6.6.1/gcc_64/include/QtGui \
-isystem /usr/include \
-DQT_QML_DEBUG -g -std=gnu++17 -fdiagnostics-color=always -fPIC \
-MD -MT CMakeFiles/pcm2.dir/mainwindow.cpp.o -MF CMakeFiles/pcm2.dir/mainwindow.cpp.o.d \
-o CMakeFiles/pcm2.dir/mainwindow.cpp.o -c /home/mustafa/Desktop/Programming/QtProjects/pcm2/mainwindow.cpp

命令里明明带有-isystem /usr/include参数，这个目录下确实存在math.h头文件，但编译器却报出了如下错误：

/usr/include/c++/12/cmath:45:15: fatal error: math.h: No such file or directory
45 | #include_next <math.h>
|               ^~~~~~~~
compilation terminated.

我试过几种方法试图解决，但都没效果：

• 手动给编译命令加上-I /usr/include/c++/12（这个目录下也有math.h），但错误依旧；
• 在CMakeLists.txt里添加了：

  include_directories(BEFORE SYSTEM
  /usr/include
  /usr/include/c++/12
  )
  

  也没起作用；
• 后来听人说可能我把问题复杂化了，于是我删除了自己手动加的/usr/include/x86_64-linux-gnu包含配置，把CMakeLists.txt还原成了Qt初始生成的样子：

  cmake_minimum_required(VERSION 3.5)
  
  project(pcm2 VERSION 0.1 LANGUAGES CXX)
  
  set(CMAKE_AUTOUIC ON)
  set(CMAKE_AUTOMOC ON)
  set(CMAKE_AUTORCC ON)
  
  set(CMAKE_CXX_STANDARD 17)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  
  find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
  find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)
  
  set(PROJECT_SOURCES
  main.cpp
  mainwindow.cpp
  mainwindow.h
  mainwindow.ui
  )
  
  if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
  qt_add_executable(pcm2
  MANUAL_FINALIZATION
  ${PROJECT_SOURCES}
  )
  # Define target properties for Android with Qt 6 as:
  #    set_property(TARGET pcm2 APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
  #                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
  else()
  if(ANDROID)
  add_library(pcm2 SHARED
  ${PROJECT_SOURCES}
  )
  # Define properties for Android with Qt 5 after find_package() calls as:
  #    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
  else()
  add_executable(pcm2
  ${PROJECT_SOURCES}
  )
  endif()
  endif()
  
  target_link_libraries(pcm2 PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
  
  # Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1.
  # If you are developing for iOS or macOS you should consider setting an
  # explicit, fixed bundle identifier manually though.
  if(${QT_VERSION} VERSION_LESS 6.1.0)
  set(BUNDLE_ID_OPTION MACOSX_BUNDLE_GUI_IDENTIFIER com.example.pcm2)
  endif()
  set_target_properties(pcm2 PROPERTIES
  ${BUNDLE_ID_OPTION}
  MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
  MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
  MACOSX_BUNDLE TRUE
  WIN32_EXECUTABLE TRUE
  )
  
  include(GNUInstallDirs)
  install(TARGETS pcm2
  BUNDLE DESTINATION .
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
  )
  
  if(QT_VERSION_MAJOR EQUAL 6)
  qt_finalize_executable(pcm2)
  endif()
  

  但现在编译命令变成了这样，还是报同样的错误：

  /usr/bin/x86_64-linux-gnu-g++-12 --sysroot=/home/mustafa/Desktop/Programming/QtProjects \
  -DQT_CORE_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB \
  -I/home/mustafa/Desktop/Programming/QtProjects/build-pcm3-Desktop-Debug/pcm3_autogen/include \
  -isystem /home/mustafa/Qt/6.6.1/gcc_64/include/QtCore \
  -isystem /home/mustafa/Qt/6.6.1/gcc_64/include \
  -isystem /home/mustafa/Qt/6.6.1/gcc_64/mkspecs/linux-g++ \
  -isystem /home/mustafa/Qt/6.6.1/gcc_64/include/QtWidgets \
  -isystem /home/mustafa/Qt/6.6.1/gcc_64/include/QtGui \
  -isystem /usr/include \
  -DQT_QML_DEBUG -g -std=gnu++17 -fdiagnostics-color=always -fPIC \
  -MD -MT CMakeFiles/pcm3.dir/pcm3_autogen/mocs_compilation.cpp.o -MF CMakeFiles/pcm3.dir/pcm3_autogen/mocs_compilation.cpp.o.d \
  -o CMakeFiles/pcm3.dir/pcm3_autogen/mocs_compilation.cpp.o -c /home/mustafa/Desktop/Programming/QtProjects/build-pcm3-Desktop-Debug/pcm3_autogen/mocs_compilation.cpp
  

我现在怀疑是不是cmath里用的#include_next <math.h>导致的问题？还是有其他我没注意到的地方？麻烦各位大佬帮忙分析下，谢谢了！

备注：内容来源于stack exchange，提问作者Mustafa Aslan