[LLVMdev] Configuring for cross-compilation doesn't work

[Frank Winter]

Let me add that when not specifying the '--host' option, the whole thing 
fails as well:

../llvm/configure CXX=icpc CC=icc CXXFLAGS="-O3 -mmic" CFLAGS="-O3 -mmic"

checking for C compiler default output file name... a.out
checking whether the C compiler works... configure: error: cannot run C 
compiled programs.
If you meant to cross compile, use `--host'.

Frank


On 02/12/13 15:09, Frank Winter wrote:
> Hi,
>
> I am trying to build LLVM 3.4 RC1 with the Intel compiler targeting 
> the Xeon Phi (native). In order to skip the building and execution of 
> a test binary during configuration one needs the set the "-host" 
> option indicating a cross compilation. Intel suggests to use 
> "x86_64-unknown-linux-gnu".
>
> However, either using "x86_64-unknown-linux-gnu" or something unknown 
> like "unknown" brings me through the configuration:
>
> ../llvm/configure CXX=icpc CC=icc CXXFLAGS="-O3 -mmic" CFLAGS="-O3 
> -mmic" --host=x86_64-unknown-linux-gnu
>
> configure: WARNING: If you wanted to set the --build type, don't use 
> --host.
>     If a cross compiler is detected then cross compile mode will be used.
> checking for x86_64-unknown-linux-gnu-clang... icc
> checking for C compiler default output file name... a.out
> checking whether the C compiler works... yes
> ...
> checking for gcc... gcc
> configure: error: installation or configuration problem: compiler 
> cannot create executables.
> make: *** No targets specified and no makefile found.  Stop.
> make: *** No rule to make target `install'.  Stop.
>
>
>
> ../llvm/configure CXX=icpc CC=icc CXXFLAGS="-O3 -mmic" CFLAGS="-O3 
> -mmic" --host=unknown
> checking for unknown-clang... icc
> checking for C compiler default output file name... a.out
> checking whether the C compiler works... yes
> checking whether we are cross compiling... yes
> checking for suffix of executables...
>
> configure: WARNING: Configuring LLVM for an unknown target archicture
> configure: WARNING: Configuring LLVM for an unknown host archicture
> checking for gcc... gcc
> configure: error: installation or configuration problem: compiler 
> cannot create executables.
>
>
> Any ideas?
>
> Frank
>
>
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