c++ - Skipping Incompatible Libraries at compile

Question

When I try to compile a copy of my project on my local machine, I get an error stating that it 's skipping over incompatible libraries. This isn't the case when I'm messing around with the live version hosted on the server at work [it makes perfectly there].

Various other sites have lead me to believe that this might be an environment issue, as I'm developing on a 64-bit distro of Ubuntu and I assume the server version is running on 32-bit. Nevertheless, after setting my environment variables to:

CFLAGS+=" -m32"
CXXFLAGS+=" -m32"

I still receive the same compile error of:

/usr/bin/ld: skipping incompatible /dvlpmnt/libPI-Http.a when searching for -lPI-Http

Can haz tutorial?

==Edit==

This was the output I recieved when I followed Jonathan's advice:

http.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not stripped

Apparently, the library in question is 32-bit after all?

Answer 1

That message isn't actually an error - it's just a warning that the file in question isn't of the right architecture (e.g. 32-bit vs 64-bit, wrong CPU architecture). The linker will keep looking for a library of the right type.

Of course, if you're also getting an error along the lines of can't find lPI-Http then you have a problem :-)

It's hard to suggest what the exact remedy will be without knowing the details of your build system and makefiles, but here are a couple of shots in the dark:

1. Just to check: usually you would add flags to CFLAGS rather than CTAGS - are you sure this is correct? (What you have may be correct - this will depend on your build system!)
2. Often the flag needs to be passed to the linker too - so you may also need to modify LDFLAGS

If that doesn't help - can you post the full error output, plus the actual command (e.g. gcc foo.c -m32 -Dxxx etc) that was being executed?