g++

问题 Is there a g++ equivalent to Visual Studio's __declspec(novtable) argument? Basically, in a pure virtual base class the __declspec(novtable) argument can be used to suppress the creation of a vtable for the base class as well as vtable initialization/deinitialization code in the contstructor/destructor respectively. E.g., class __declspec(novtable) PureVirtualBaseClass { public: PureVirtualBaseClass(){} virtual ~PureVirtualBaseClass() = 0; }; See Paul DiLascia's article for more info. Also

问题 On my computer I have Windows 7 x86. I installed MinGW, I wrote the path but when I go in cmd.exe and write g++ -v it says: "g++" is not recognized as an internal or external command. But when I write the make -v command it recognizes it. I need this for school, I work in Eclipse, I even installed the latest java(I saw it must be installed). 回答1: Seeing that the make command works fine, I think you forgot to mark the mingw-gcc-g++ package in the MinGW Installation Manager. Run the MinGW

问题 How do I get the POSIX strerror_r instead of GNU version? I'm compiling with g++ on Ubuntu 8.04 with glibc version 2.7 ( based on what's in ). Edit On the above man page it says: Feature Test Macro Requirements for glibc (see feature_test_macros(7)): The XSI-compliant version of strerror_r() is provided if: (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE Otherwise, the GNU-specific version is provided. It then says in feature_test_macros(7): If no feature test macros are

问题 Background: Many years ago, I inherited a codebase that was using the Visual Studio (VC++) flag '/fp:fast' to produce faster code in a particular calculation-heavy library. Unfortunately, '/fp:fast' produced results that were slightly different to the same library under a different compiler (Borland C++). As we needed to produce exactly the same results, I switched to '/fp:precise', which worked fine, and everything has been peachy ever since. However, now I'm compiling the same library with

问题 It's not clear to me what linking options exist for the Boost.Thread 1.34.1 library. I'm on Ubuntu 8.04 and I've found that when using either boost_thread or boost_thread-mt during linking both compile and run, but I don't see any documentation on these or any other linking options in above link. What Boost.Thread linking options are available and what do they mean? 回答1: Well... The first amusing thing is that the -mt modifier in the name is to indicate the library is Ok for multithreading.

问题 Compiling / linking with -nostdlib seems to prevent static initialization, even if I add my own crti.s and crtn.s with .init / .fini sections. Are there workarounds to make g++ generate static initialization code that is inserted in .init or that I can call manually? This is what I tried: g++ -o test.o -c -fno-use-cxa-atexit test.cc # has _start (entry point) # that calls _init and _main as -o crti.o crti.s # has _init in section .init as -o crtn.o crtn.s g++ -o test ./crti.o test.o

问题 I have GetContainer() function as follows. template<typename I,typename T,typename Container> Container& ObjCollection<I,T,Container>::GetContainer() { return mContainer; } When I use this method as follows template<typename I,typename T> T& DynamicObjCollection<I,T>::Insert(T& t) { GetContainer().insert(&t); return t; } I got errors. error: there are no arguments to ‘GetContainer’ that depend on a template parameter, so a declaration of ‘GetContainer’ must be available error: (if you use ‘

问题 My LIBRARY_PATH environment variable has a custom directory in it: /cs/public/lib/pkg/opencv/lib . But, when I use g++ --print-search-dirs , I get this instead: libraries: = /cs/public/lib/pkg/opencv/lib/x86_64-suse-linux/4.6/: /cs/public/lib/pkg/opencv/lib/../lib64/: /usr/lib64/gcc/x86_64-suse-linux/4.6/: /usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../x86_64-suse-linux/lib/x86_64-suse-linux/4.6/: /usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../x86_64-suse-linux/lib/../lib64/: /usr/lib64

问题 Alright, I have a really troubling CUDA 5.0 question about how to link things properly. I'd be really grateful for any assistance! Using the separable compilation features of CUDA 5.0, I generated a static library (*.a). This nicely links with other *.cu files when run through nvcc, I have done this many times. I'd now like to take a *.cpp file and link it against the host code in this static library using g++ or whatever, but not nvcc. If I attempt this, I get compiler errors like undefined

问题 Consider the following code: #include <tuple> #include <iostream> template <class T> struct custom_wrapper { template <class Arg> custom_wrapper(Arg arg): data(arg) {} T data; }; template <class Arg> custom_wrapper(Arg arg) -> custom_wrapper<Arg>; template <class... T> struct custom_tuple { template <class... Args> custom_tuple(Args... args): data(args...) {} std::tuple<T...> data; }; template <class... Args> custom_tuple(Args... args) -> custom_tuple<Args...>; int main(int argc, char* argv[]