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

Stephen Hines srhines at google.com
Wed Oct 9 09:42:36 PDT 2013 

Right, I think that you can't use hard-float for your compiler ABI. You
will need to recompile things with soft-float. The NDK does not supply any
hard-float libraries to link against, so by passing -mfloat-abi=hard, you
are still picking up the soft-float versions (and hence getting link
errors).

Steve


On Wed, Oct 9, 2013 at 9:11 AM, Anton Smirnov <dev at antonsmirnov.name> wrote:

> Sorry, Stephen*.
>
>
> 2013/10/9 Anton Smirnov <dev at antonsmirnov.name>
>
>> Hi, Steven.
>>
>> That's exactly what i'm having now!
>>
>> I've tried to solve it by adding LOCAL_EXPORT_CPPFLAGS := -mfpu=vfp
>> -mfloat-abi=hard in Android.mk and APP_ABI := armeabi-v7a in Application.mk
>> but it did not help unfortunately.
>> I'm using android log (#include <android/log.h>, #include <stdio.h> and
>> #include <string.h>) is this the reason of linking error?
>>
>> Do you know how can it be solved?
>>
>> PS. i've tried ndk-build v=1 to see actual command line and it seems that
>> i can just use linker from arm-linux-gnueabihf toolchains.. How do you think
>> will it help?
>>
>>
>> 2013/10/9 Stephen Hines <srhines at google.com>
>>
>>> If you are using Android's NDK, you should be aware that it targets
>>> soft-float for all ARM ABIs. Thus, if you are linking against any of the
>>> NDK components, they are not going to match a hard-float piece that you
>>> have built from scratch.
>>>
>>> Steve
>>>
>>>
>>> On Tue, Oct 8, 2013 at 11:41 AM, James Molloy <james at jamesmolloy.co.uk>wrote:
>>>
>>>> Hi Anton,
>>>>
>>>> Ensure -mfloat-abi=hard is in your CFLAGS and CXXFLAGS. Also ensure you
>>>> target a recent-ish processor or -march=armv7.
>>>>
>>>> I can't really give support on the android linker, but it does look
>>>> like your resulting binary is soft-float.
>>>>
>>>> James
>>>>
>>>>
>>>> On 8 October 2013 19:29, Anton Smirnov <dev at antonsmirnov.name> wrote:
>>>>
>>>>> Hi.
>>>>>
>>>>> I've succeed to compile clang for ARM using ubuntu ..gnueabihf..
>>>>> packages, but libclang.so can't be stripped
>>>>> using tool from ndk because of error:
>>>>>
>>>>> /softdev/android-ndk-r8e/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld:
>>>>> error:
>>>>> /Users/asmirnov/Documents/dev/src/clang_jni/obj/local/armeabi/libclang.so
>>>>> uses VFP register arguments, output does not
>>>>>
>>>>> Not sure what's wrong now since i've passed cpu and float (hard) as
>>>>> parameters. Any suggestions?
>>>>> BTW I'm going to use it on android devices which are ARM hard float.
>>>>>
>>>>> I'm going to try to compile it with linaro toolchain tomorrow on 32bit
>>>>> vm as it does not work on 64bit (or i was not able just to find it for
>>>>> 64bit).
>>>>>
>>>>> Thanks,
>>>>> Anton.
>>>>>
>>>>>
>>>>> 2013/10/8 James Molloy <james at jamesmolloy.co.uk>
>>>>>
>>>>>> Anton,
>>>>>>
>>>>>> The compiler I'm using is this one:
>>>>>> https://launchpad.net/gcc-linaro/+milestone/4.8-2013.08 . This just
>>>>>> happens to be the latest linaro compiler installed on the central package
>>>>>> database at ARM. I'd assume the ubuntu one would work just as well.
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> James
>>>>>>
>>>>>>
>>>>>> On 8 October 2013 17:09, Anton Smirnov <dev at antonsmirnov.name> wrote:
>>>>>>
>>>>>>> I've noticed you've used linaro toolchain instead of ubuntu's
>>>>>>> gcc-4.7-arm-linux-gnueabihf (and other packages from
>>>>>>> http://llvm.org/docs/HowToCrossCompileLLVM.html).
>>>>>>> Can you write what packages should be downloaded and installed from
>>>>>>> http://www.linaro.org/downloads/ ?
>>>>>>>
>>>>>>> Thanks and regards,
>>>>>>> Anton.
>>>>>>>
>>>>>>>
>>>>>>> 2013/10/8 Anton Smirnov <dev at antonsmirnov.name>
>>>>>>>
>>>>>>>> Thanks, James.
>>>>>>>>
>>>>>>>> I will give it a try right now!
>>>>>>>>
>>>>>>>>
>>>>>>>> 2013/10/8 James Molloy <james at jamesmolloy.co.uk>
>>>>>>>>
>>>>>>>>> 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
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> cfe-dev mailing list
>>>>>>>>>> cfe-dev at cs.uiuc.edu
>>>>>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> cfe-dev mailing list
>>>> cfe-dev at cs.uiuc.edu
>>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>>>
>>>>
>>>
>>
>
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