c++ - Makefile 'fdopen: Bad file descriptor' error -

i'm making makefile, , getting error:

list.h:10:18: error: calling fdopen: bad file descriptor 

i have no idea why happens. here's beginning of list.h:

#ifndef list_h__ #define list_h__  #include "data.h" #include "general.h" 

where #include "data.h" 10th line. data , general order in dependencies written in makefile:

list.o: list.cpp list.h data.h general.h     g++ list.cpp $(f) 

data doesn't include , general includes iostream, , no other class includes iostream.

here's data.h:

#ifndef data_h__ #define data_h__  class data { private: public:     //default constructor     data() {}     //destructor     virtual ~data()=0;     /*****************************************************************************     * function name: operator<     * input: data, other data     * output: operator compare between 2 datas. comparison     * used create sorted list.     *****************************************************************************/     virtual bool operator<(const data& other) const =0; };  data::~data() {}  #endif //data_h__ 

i had trivial implementation of data's destructor after =0, , i've tried move trivial implementations of constructor , destructor .cpp file. of above didn't work. please - i've been stuck on makefile hours , it's driving me crazy! thanks!

first, check see if using precompiled headers. if delete precompiled headers.

if doesn't work, think this may help. there bug in version of g++ including header multiple times in single unit.

look @ see if including data.h multiple times.

---

precompiled headers: .gch files , delete them.

precompiled header

often large projects have many header files included in every source file. time compiler takes process these header files on , on again can account of time required build project. make builds faster, gcc allows users `precompile' header file; then, if builds can use precompiled header file faster.

to create precompiled header file, compile other file, if necessary using -x option make driver treat c or c++ header file. want use tool make keep precompiled header up-to-date when headers contains change.

a precompiled header file searched when #include seen in compilation. searches included file (see search path) compiler looks precompiled header in each directory before looks include file in directory. name searched name specified in #include `.gch' appended. if precompiled header file can't used, ignored.

for instance, if have #include "all.h", , have all.h.gch in same directory all.h, precompiled header file used if possible, , original header used otherwise.