c++ - Compilation errors with CImg -

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i using cimg library first time , compilation errors simple test program includes cimg.h. why that? how can fix this?

program code:

#include "../headers/cimg.h" using namespace cimg_library; int main() {     return 0; }

compilation errors:

in function 'file* cimg_library::cimg::fopen(const char*, const char*)': 5065|error: '_fileno' not declared in scope in function 'int cimg_library::cimg::fseek(file*, int_ptr, int)': 5093|error: '_fseeki64' not declared in scope in function 'int_ptr cimg_library::cimg::ftell(file*)': 5102|error: '_ftelli64' not declared in scope

this done on pc 64 bit windows 8.1.

command:

g++.exe -wall -fexceptions -g -std=c++11  -c "d:\informatics\projects\image experiments\rectangle circle stretcher\sources\main.cpp" -o obj\debug\sources\main.o

i tried without -std=c++11 part , 2 errors instead of 3. don't 5065|error: '_fileno' not declared in scope. same happens if replace -std=gnu++11

i tried on laptop, runs 64 bit version of windows 7, , same happens there.

so far, have work around first error, nothing other two.

in case of codeblock 16.01 stdio.h contains lines

#if __msvcrt_version__ >= 0x800 _crtimp int __cdecl __mingw_nothrow     _fseek_nolock (file*, long, int); _crtimp long __cdecl __mingw_nothrow    _ftell_nolock (file*);  _crtimp int __cdecl __mingw_nothrow     _fseeki64 (file*, __int64, int); _crtimp __int64 __cdecl __mingw_nothrow _ftelli64 (file*); _crtimp int __cdecl __mingw_nothrow     _fseeki64_nolock (file*, __int64, int); _crtimp __int64 __cdecl __mingw_nothrow _ftelli64_nolock (file*); #endif

i.e. functions not declared unless __msvcrt_version__ @ least 0x800. following might work (at least did codeblocks 16.01)

#if defined(__mingw32__) #define __msvcrt_version__ 0x800 #define _win32_winnt 0x0500 #endif  // if needed // #define _fileno fileno  #include "cimg.h"

if stdio.h not contain declaration _fseeki64 , others, either

  • use cimg 1.6.9 not use _fseeki64,
  • upgrade gcc/g++, or
  • provide own implementation _fseeki64 (if such 1 can found somewhere).

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