C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  problem with default constructor of global object          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message ChrisG Guest Posted: Tue Nov 29, 2005 3:29 am    Post subject: problem with default constructor of global object Hi, I have a simple code: ================================================== #include <iostream.h> class InstructionSet { public: InstructionSet() { cerr << "InstructionSet CONSTRUCTORn"; } ~InstructionSet() { cerr << "InstructionSet DESTROYEDn"; } }; InstructionSet globalInstructionSet; int main(int argc, char * argv[]) { cerr << "mainn"; return 0; } ================================================== When I built and ran this on IBM AIX with xlc version 5, I got main But on the other UNIX platforms (HP, SGI, Alpha, Linux, SUN), I got InstructionSet CONSTRUCTOR main InstructionSet DESTROYED Do you know why the Aix build is not calling the default constructor? The build commands on Aix are Compiling rdc.cpp xlc -q64 -O2 -DAIX5 -DRS64 -DRS6000 -qnolm -DUSE_AIX_LOCAL -c -o rdc.o rdc.cpp -I. -Iunix -I../../include/ Creating rdc xlc -q64 -O2 -DAIX5 -DRS64 -DRS6000 -qnolm -DUSE_AIX_LOCAL -o rdc rdc.o -bh:4 -bpT:0x10000000 -bpD:0x200000 -L. -L../../bin/ -lbsd -q64 -lpthreads -lC -lC -lc -lxlf90 -lm Many thanks in advance, Chris Back to top Thomas Tutone Guest Posted: Tue Nov 29, 2005 4:44 am    Post subject: Re: problem with default constructor of global object ChrisG wrote: Quote: I have a simple code: ================================================== #include class InstructionSet { public: InstructionSet() { cerr << "InstructionSet CONSTRUCTORn"; } ~InstructionSet() { cerr << "InstructionSet DESTROYEDn"; } }; InstructionSet globalInstructionSet; int main(int argc, char * argv[]) { cerr << "mainn"; return 0; } ================================================== When I built and ran this on IBM AIX with xlc version 5, I got main But on the other UNIX platforms (HP, SGI, Alpha, Linux, SUN), I got InstructionSet CONSTRUCTOR main InstructionSet DESTROYED Do you know why the Aix build is not calling the default constructor? The build commands on Aix are Compiling rdc.cpp xlc -q64 -O2 -DAIX5 -DRS64 -DRS6000 -qnolm -DUSE_AIX_LOCAL -c -o rdc.o rdc.cpp -I. -Iunix -I../../include/ Creating rdc xlc -q64 -O2 -DAIX5 -DRS64 -DRS6000 -qnolm -DUSE_AIX_LOCAL -o rdc rdc.o -bh:4 -bpT:0x10000000 -bpD:0x200000 -L. -L../../bin/ -lbsd -q64 -lpthreads -lC -lC -lc -lxlf90 -lm Since you never actually use globalInstructionSet, it may be that it's simply being optimized out of existence. Try recompiling without optimizations and see if you still have that problem. Best regards, Tom Back to top Axter Guest Posted: Tue Nov 29, 2005 7:47 am    Post subject: Re: problem with default constructor of global object ChrisG wrote: Quote: Hi, I have a simple code: ================================================== #include <iostream.h class InstructionSet { public: InstructionSet() { cerr << "InstructionSet CONSTRUCTORn"; } ~InstructionSet() { cerr << "InstructionSet DESTROYEDn"; } }; InstructionSet globalInstructionSet; int main(int argc, char * argv[]) { cerr << "mainn"; return 0; } ================================================== When I built and ran this on IBM AIX with xlc version 5, I got main But on the other UNIX platforms (HP, SGI, Alpha, Linux, SUN), I got InstructionSet CONSTRUCTOR main InstructionSet DESTROYED Do you know why the Aix build is not calling the default constructor? The build commands on Aix are Compiling rdc.cpp xlc -q64 -O2 -DAIX5 -DRS64 -DRS6000 -qnolm -DUSE_AIX_LOCAL -c -o rdc.o rdc.cpp -I. -Iunix -I../../include/ Creating rdc xlc -q64 -O2 -DAIX5 -DRS64 -DRS6000 -qnolm -DUSE_AIX_LOCAL -o rdc rdc.o -bh:4 -bpT:0x10000000 -bpD:0x200000 -L. -L../../bin/ -lbsd -q64 -lpthreads -lC -lC -lc -lxlf90 -lm iostream.h> is not part of the C++ standard, and therefore not portable. You should use <iostream> instead, which is part of the standard and portable. Some implementations keep legacy code in their <iostream.h> version which also includes bugs they don't fix, because they're no longer updating the non-standard headers. For more reliable code, and for more portability, you should always use the extensionless STL header <iostream> Back to top ChrisG Guest Posted: Tue Nov 29, 2005 7:09 pm    Post subject: Re: problem with default constructor of global object Thanks for the suggestions. Using xlC instead of xlc solved the problem. 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