g++ ignoring header files

Question

So I am trying to create a exec with g++. My command is as follows:

g++ -o project21  main.cpp tools.hpp file.hpp FileInfo.cpp file.cp tools.cpp

I get an error

ld: warning: ignoring file tools.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)
ld: warning: ignoring file file.hpp, file was built for unsupported file format which is not the architecture being linked (x86_64)

The behavior here is that odd is that I can compile it in XCode and using the exec just fine it is just in the shell that I am having the problem.

Why do you need to compile `.hpp` files? You need to include them from your cpp files, not pass them to the command line. — Sergey Kalinichenko, Jun 27 '12 at 02:42
@dasblinkenlight I get segment fault 11 if I try run the compiled code — Joe Tyman, Jun 27 '12 at 02:45
If Xcode build works, you can re-build in Xcode, and [peek at the build commands](http://stackoverflow.com/a/4303974/335858) to see what it does differently. — Sergey Kalinichenko, Jun 27 '12 at 02:49

score 1 · Answer 1 · answered Jun 27 '12 at 04:15

You don't need to compile the hpp files. Include them in your .cpp files.

Even if you include the hpp on your project, Xcode won't compile them, unless you explicitly ask it to (my mac is at work, but if I recall click the project (root of the tree at the left), click a target and check the tab build phases, there is a list with the files to compile).

About the segmentation fault, if it were missing source files (i.e, you added code in the .hpp files that really should be on a .cpp file), then you would get a link error, and not a segmentation fault. There are other reasons to the segmentation fault, run on GDB and debug it (compile with -g to be able to debug). Here are some possibilities:

If you are building for a different platform, the problem may be some platform specific code.
Compiler incompatibility: assuming you were using Xcode with LLVM, you may have some code that works with LLVM but behave different with gcc. Very unlikely (by my experience with those compilers, I can say they are very compatible), but still possible.

Michael Burr · Answer 2 · 2012-06-27T06:08:28.813

0

Try deleting any *.gch files that may have been created by the Xcode build before trying your g++ command.

However, in general I'd try to get things working without pre-compiling the header files first, then add the pre-compiled header optimization if it's necessary (i.e., don't pass the .hpp files to the compiler explicitly until you've got everything else working and only if you really need to).

edited Jun 27 '12 at 06:08

answered Jun 27 '12 at 03:42

Michael Burr

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g++ ignoring header files

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