llvm dev - Dec 2013 - [LLVMdev] Configuring for cross-compilation doesn't work

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

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
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

For the record: CMake is needed for cross compilation.

There is a small article how to cross compile with CMake for Xeon Phi:

http://software.intel.com/en-us/articles/cross-compilation-for-intel-xeon-phi-coprocessor-with-cmake

Frank


On 02/12/13 15:18, Frank Winter wrote:
> 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
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

On 12/02/2013 02:18 PM, Frank Winter wrote:
> 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
You also need the --build option. --host should be the target system and 
--build should be set to the build host. Then configure will use the 
build host's compiler to build stuff that needs to run there, like tblgen.

I use this to cross build my clang/LLVM based tool chain, ELLCC. 
http://ellcc.org

-Rich