Question

我正在尝试编译应用程序，并在CMakeLists.txt

中添加了这些行

option(DISPLAY "Display images and steps" OFF)
option(TESTS "Build tests too" OFF)

if (DISPLAY)
set(CMAKE_CXX_FLAGS "-g -Wall -std=gnu++11 -DDISPLAY_IMGS")
else()
set(CMAKE_CXX_FLAGS "-g -Wall -std=gnu++11")
endif()

（这些行位于文件的开头）我收到如下错误：

In function ‘int main(int, char**)’:
error: in C++98 ‘featuresTypes’ must be initialized by constructor, not by ‘{...}’

谁能告诉我它为什么这样做？事实上，在KDevelop中构建它可以正常工作，但在终端（$ cmake ..和$ make）中构建它会产生错误。

VERBOSE=1说：

/usr/bin/cmake -H/home/xxx/proj/prj1 -B/home/xxx/proj/prj1/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/xxx/proj/prj1/build/CMakeFiles /home/xxx/proj/prj1/build/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/xxx/proj/prj1/build'
make -f CMakeFiles/prj1.dir/build.make CMakeFiles/prj1.dir/depend
make[2]: Entering directory `/home/xxx/proj/prj1/build'
cd /home/xxx/proj/prj1/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/xxx/proj/prj1 /home/xxx/proj/prj1 /home/xxx/proj/prj1/build /home/xxx/proj/prj1/build /home/xxx/proj/prj1/build/CMakeFiles/prj1.dir/DependInfo.cmake --color=
Dependee "/home/xxx/proj/prj1/build/CMakeFiles/optimisation.dir/DependInfo.cmake" is newer than depender "/home/xxx/proj/prj1/build/CMakeFiles/prj1.dir/depend.internal".
Dependee "/home/xxx/proj/prj1/build/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "/home/xxx/proj/prj1/build/CMakeFiles/prj1.dir/depend.internal".
Scanning dependencies of target optimisation
make[2]: Leaving directory `/home/xxx/proj/prj1/build'
make -f CMakeFiles/optimisation.dir/build.make CMakeFiles/prj1.dir/build
make[2]: Entering directory `/home/xxx/proj/prj1/build'
/usr/bin/cmake -E cmake_progress_report /home/xxx/proj/prj1/build/CMakeFiles 1
[ 12%] Building CXX object CMakeFiles/prj1.dir/src/cpp/main.cpp.o
/usr/bin/c++    -I/usr/local/include/opencv -I/usr/local/include -I/home/xxx/proj/prj1/src/hpp    -o CMakeFiles/prj1.dir/src/cpp/main.cpp.o -c /home/xxx/proj/prj1/src/cpp/main.cpp
/home/xxx/proj/prj1/src/cpp/main.cpp: In function ‘int main(int, char**)’:
/home/xxx/proj/prj1/src/cpp/main.cpp:99:33: error: in C++98 ‘featuresTypes’ must be initialized by constructor, not by ‘{...}’

它应该做什么呢？

Answer 1

你的旗帜根本没有进入构建命令。因此，您尝试在project的{{1}}行之前设置这些标记，或者您之后包含覆盖它们的内容。

你可能应该将它们移到任何CMakeLists.txt行并包含，并将它们附加到当前值的任何值，因为上一个标志获胜。

project

为什么在指定-std = gnu ++ 11时使用C ++ 98？

1 个答案: