After much wrestling to get this to compile on gcc-4.4, I finally got an error I can't get around. I configured and compiled llvm just as the guide suggests. Here is the error I am getting:

/usr/bin/ld: skipping incompatible /host/iphone/llvm-svn/Release/lib/libLLVMSupport.a when searching for -lLLVMSupport /usr/bin/ld: cannot find -lLLVMSupport collect2: ld returned 1 exit status make[2]: * [/host/iphone/llvm-svn/Release/bin/tblgen] Error 1 make[2]: Leaving directory /host/iphone/llvm-svn/utils/TableGen' make[1]: *** [TableGen/.makeall] Error 2 make[1]: Leaving directory/host/iphone/llvm-svn/utils' make: * [all] Error 1

I have attached a patch file with all the changes I made to get it to compile. I am on Ubuntu Karmic (9.10) x86_64 running gcc v 4.4.1.

What can I do to get around this error? Thanks!

I am on Ubuntu Karmic (9.10) x86_64 running gcc v 4.2.4. I had this same problem, fixed by:

sudo apt-get install gfortran-4.2 gfortran-4.2-multilib fort77

I don't know if fort77 matters, but I installed it anyway.
Good luck; I am having many problems compiling, due to the system being 64-bit. Make sure you install the g++ and gcc multilibs too, you are going to need them.

Also seeing this:

make[3]: Leaving directory /home/chris/llvm/utils/unittest/UnitTestMain' make[2]: Leaving directory/home/chris/llvm/utils/unittest' llvm[2]: Linking Debug executable tblgen /usr/bin/ld: skipping incompatible /home/chris/llvm/Debug/lib/libLLVMSupport.a when searching for -lLLVMSupport /usr/bin/ld: skipping incompatible /home/chris/llvm/Debug/lib/libLLVMSupport.a when searching for -lLLVMSupport /usr/bin/ld: cannot find -lLLVMSupport collect2: ld returned 1 exit status

I don't think the issue was specific to gfortran-4.2. I presume its just that that package is dependent on some g++ packages that are relevant to the compile process.

I just got this to compile on Ubuntu 10.04 with g++ 4.1, but I had to have g++4.4 installed. I am probably not understanding something here, but it need both packages present to compile...

ok, the real reason was the fact that I had LDFLAGS=-m32 flag set. I don't know if its ok to use this flag in some cases and not in others... for LLVM it is not set, but for the odcctools it is not.

OK, I needed to add

export CXXFLAGS=-m32

How I found out: - The linker error "skipping incompatible" means most likley 32/64 bit mismatch - print out the actual commands from make "make -n" and saw no -m32 - Then I looked at the rules for the Makefile.rules and noticed the CXXFLAGS...