G++ warning: built for unsupported file format which is not the architecture being linked

Question

Whenever I try to compile my project (with the command line g++ *.hpp *.cpp 2> log.txt), that's what I get:

log.txt:

ld: warning: in configfile.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)
ld: warning: in erase.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)
ld: warning: in filehandler.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)
ld: warning: in insert.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)
ld: warning: in operation.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)

Any ideas of why this is happening? I'm under OSX 10.6 (using latest Developer Tools)

Answer 1

You're compiling header files (.hpp) which you shouldn't do yet. Only compile source files (.cpp)

Rather than compiling all .cpp files, compile them one at a time and then link them appropriately.

g++ -c x.cpp
g++ -c y.cpp
g++ -c z.cpp

g++ -o tst x.o y.o z.o

Note that only one of your .cpp files can have a main() function - otherwise the OS won't know where the entry point is.

Answer 2

I do not own a Mac so I'm kind of giving you the Linux version of what to do when this happens.

Look for a multilib version of gcc and recompile with the -m32 switch

g++ *.hpp *.cpp -m32

Try this. You CAN compile header files with gcc to produce pre-compiled headers.

Answer 3

The g++ parameter -arch i386 should do the trick for you:

g++ *.hpp *.cpp -m32 -arch i386

Is that correct?