[cfe-dev] Build Clang on x86_64 (ubuntu) with arm-linux-gnueabihf failed

Tue Oct 8 08:26:35 PDT 2013

Hi Anton,

I'm very confused about your setup. The subject of these emails suggests
you want to use arm-linux-gnueabihf, but the CMake verbose output you
showed shows you've told it to use clang++ (/usr/local/bin/clang++
-target armv7a-linux-gnueabihf). The compiler flags also seem to be a
frankenmix of x86 and ARM ( -L/usr/lib/gcc/x86_64-linux-gnu/4.7 is never
gonna work!)

I managed a build without any problems using:

mkdir build; cd build; cmake .. -DCMAKE_C_COMPILER=arm-linux-gnueabihf-gcc
-DCMAKE_CXX_COMPILER=arm-linux-gnueabihf-g++ -DCMAKE_SYSTEM_NAME=Linux

As the CMake cross-compilation wiki says, "CMAKE_SYSTEM_NAME" is very
important as it tells CMake that it's cross compiling.

I also went and looked at the wiki page you quoted, and went and tried it
out. That page is written for someone who wants to cross compile *with
clang*. You want to cross-compile with gcc, so there are some changes you
need to make.

You must remove the "-target" parameter. You must also remove the
"-ccc-gcc-name" parameter. You also still need the CMAKE_C_COMPILER and
CMAKE_CXX_COMPILER arguments. So the line becomes:

cmake ..
-DCMAKE_C_COMPILER=/work/tools/linaro/gnueabi/2013.08-20130816/bin/arm-linux-gnueabihf-gcc
-DCMAKE_CXX_COMPILER=/work/tools/linaro/gnueabi/2013.08-20130816/bin/arm-linux-gnueabihf-g++
-DCMAKE_CROSSCOMPILING=True
-DLLVM_TABLEGEN=/work/llvm/build7/../build6/native/bin/llvm-tblgen
-DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf -DLLVM_TARGET_ARCH=ARM
-DLLVM_TARGETS_TO_BUILD=ARM -DCMAKE_CXX_FLAGS=' -mcpu=cortex-a9
-I/usr/arm-linux-gnueabihf/include/c++/4.7.2/arm-linux-gnueabihf/
-I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard'

Where '/work/llvm/build7/../build6/native/bin' is the location of a
previously-built x86 llvm-tblgen.

Hopefully this has helped. My preference would be the first command line I
pasted - using -DCMAKE_SYSTEM_NAME=Linux. That seems the simplest way to
me, and it gets LLVM to auto-create its own native llvm-tblgen.

Cheers,

James

On 8 October 2013 09:07, Anton Smirnov <dev at antonsmirnov.name> wrote:

> I can confirm that after editing there is no -L/lib64 in invocation line,
> but the problem remains. I think previously compiled files were
> compiled/linked with -L/lib64 and this
> corrupts the build.
>
> How can it be fixed/walked-around?
>
>
> 2013/10/8 Anton Smirnov <dev at antonsmirnov.name>
>
>> As far as i understood, invocation line is saved in
>> CMakeFiles/llvm-tblgen.dir/link.txt.
>> I've edited it to remove -L/lib64 and invoked the last command line
>> manually but the problem remains.
>>
>> What can i do in order to avoid adding -L/lib64 ?
>>
>> Thanks,
>> Anton
>>
>>
>> 2013/10/8 Anton Smirnov <dev at antonsmirnov.name>
>>
>>> Hello.
>>>
>>> Similar question to what i asked few days ago but was not resolved.
>>>
>>> I've followed guide (http://llvm.org/docs/HowToCrossCompileLLVM.html)
>>> step-by-step.
>>> The only changes i've done is installed g++ package since i've received
>>> "no g++ found" on clear virtual machine (ubuntu 13.04_64).
>>>
>>> First i've compiled for host (to use tblgens), then for ARM.
>>> When cross-compiling for ARM (tried both ninja and autotools) i'm
>>> getting linker error:
>>>
>>> Linking CXX executable ../../bin/llvm-tblgen
>>> ../../lib/libLLVMSupport.a: could not read symbols: File format not
>>> recognized
>>> clang: error: linker command failed with exit code 1 (use -v to see
>>> invocation)
>>> make[2]: *** [bin/llvm-tblgen] Error 1
>>> make[1]: *** [utils/TableGen/CMakeFiles/llvm-tblgen.dir/all] Error 2
>>>
>>> Verbose output (make VERBOSE=1):
>>>
>>> cd /home/asmirnov/llvm_arm_cmake_build/utils/TableGen && /usr/bin/cmake
>>> -E cmake_link_script CMakeFiles/llvm-tblgen.dir/link.txt --verbose=1
>>> /usr/local/bin/clang++   -target armv7a-linux-gnueabihf -mcpu=cortex-a9
>>> -I/usr/arm-linux-gnueabihf/include/c++/4.7.3/arm-linux-gnueabihf/
>>> -I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard -ccc-gcc-name
>>> arm-linux-gnueabihf-gcc -Wall -W -Wno-unused-parameter -Wwrite-strings
>>> -Wmissing-field-initializers -pedantic -Wno-long-long
>>> -Wcovered-switch-default -Wnon-virtual-dtor -fno-rtti -O3 -DNDEBUG
>>> CMakeFiles/llvm-tblgen.dir/AsmMatcherEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/AsmWriterEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/AsmWriterInst.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CallingConvEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeEmitterGen.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeGenDAGPatterns.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeGenInstruction.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeGenMapTable.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeGenRegisters.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeGenSchedule.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CodeGenTarget.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DAGISelEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DAGISelMatcherEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DAGISelMatcherGen.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DAGISelMatcherOpt.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DAGISelMatcher.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DFAPacketizerEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/DisassemblerEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/FastISelEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/FixedLenDecoderEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/InstrInfoEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/IntrinsicEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/OptParserEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/PseudoLoweringEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/RegisterInfoEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/SetTheory.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/SubtargetEmitter.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/TGValueTypes.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/TableGen.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/X86DisassemblerTables.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/X86ModRMFilters.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/X86RecognizableInstr.cpp.o
>>> CMakeFiles/llvm-tblgen.dir/CTagsEmitter.cpp.o  -o ../../bin/llvm-tblgen
>>> -L/usr/lib/gcc/x86_64-linux-gnu/4.7  -L/lib64  ../../lib/libLLVMTableGen.a
>>> ../../lib/libLLVMSupport.a -lrt -ldl -lpthread -lpthread
>>> ../../lib/libLLVMSupport.a: could not read symbols: File format not
>>> recognized
>>> clang: error: linker command failed with exit code 1 (use -v to see
>>> invocation)
>>> make[2]: *** [bin/llvm-tblgen] Error 1
>>> make[2]: Leaving directory `/home/asmirnov/llvm_arm_cmake_build'
>>> make[1]: *** [utils/TableGen/CMakeFiles/llvm-tblgen.dir/all] Error 2
>>> make[1]: Leaving directory `/home/asmirnov/llvm_arm_cmake_build'
>>> make: *** [all] Error 2
>>>
>>>  Can it be walked-around by invocation without -L/lib64 ?
>>>
>>> Anton
>>>
>>>
>>
>
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