llvm dev - Jun 2012 - [LLVMdev] Is cross-compiling for ARM on x86 with llvm/Clang possible?

Hello,

Thank you for your kind attention to my issue and your help.

I changed the tool chain and tried again. And there is a little progress
but still have some problem.

Using --sysroot doesn't make clang use linker(ld) in the cross tool.
Most important question is how I can make clang use cross tool linker.

Let me show you my experiment and questions below.
There are two questions.

[Run]
./clang -v --save-temps -emit-llvm -ccc-host-triple arm-none-linux-gnueabi
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
hello.c

[Question]
1. How am I supposed to use --sysroot? Though I used "--sysroot"
above,
Clang uses native linker, "/usr/bin/ld" not the one in the tool chain,
"/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld".

[Output]
clang version 3.2 (trunk 158784)
Target: arm-none-linux-gnueabi
Thread model: posix

"/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/clang"
-cc1
-triple armv4t-none-linux-gnueabi
-E
-disable-free
-main-file-name hello.c
-mrelocation-model static
-mdisable-fp-elim
-fmath-errno
-mconstructor-aliases
-target-abi aapcs-linux
-target-cpu arm7tdmi
-mfloat-abi soft
-target-feature +soft-float-abi
-target-linker-version 2.22
-momit-leaf-frame-pointer
-v
-resource-dir
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2
-isysroot
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-fmodule-cache-path /var/tmp/clang-module-cache
-internal-isystem
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/local/include
-internal-isystem
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2/include
-internal-externc-isystem
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/include
-internal-externc-isystem
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/include
-fno-dwarf-directory-asm
-fdebug-compilation-dir
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin
-ferror-limit 19
-fmessage-length 205
-mstackrealign
-fno-signed-char
-fgnu-runtime
-fobjc-runtime-has-arc
-fobjc-runtime-has-weak
-fobjc-fragile-abi
-fdiagnostics-show-option
-fcolor-diagnostics
-o hello.i
-x c
hello.c

clang -cc1 version 3.2 based upon LLVM 3.2svn default target
i386-pc-linux-gnu
ignoring nonexistent directory
"/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/local/include"
ignoring nonexistent directory
"/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2/include
 /home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/include
End of search list.


"/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/clang"
-cc1
-triple armv4t-none-linux-gnueabi
-emit-llvm-bc
-disable-free
-main-file-name hello.c
-mrelocation-model static
-mdisable-fp-elim
-fmath-errno
-mconstructor-aliases
-target-abi aapcs-linux
-target-cpu arm7tdmi
-mfloat-abi soft
-target-feature +soft-float-abi
-target-linker-version 2.22
-momit-leaf-frame-pointer
-v
-resource-dir
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2
-fno-dwarf-directory-asm
-fdebug-compilation
-dir /home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin
-ferror-limit 19
-fmessage-length 205
-mstackrealign
-fno-signed-char
-fgnu-runtime
-fobjc-runtime-has-arc
-fobjc-runtime-has-weak
-fobjc-fragile-abi
-fdiagnostics-show-option
-fcolor-diagnostics
-o hello.o
-x cpp-output
hello.i

clang -cc1 version 3.2 based upon LLVM 3.2svn default target
i386-pc-linux-gnu
#include "..." search starts here:
End of search list.


"/usr/bin/ld" <<<<<<<<<< Problem #1 :
wrong linker! ld in cross toolchain
is needed!
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-z relro
-X
--hash-style=gnu
--build-id
--eh-frame-hdr
-m armelf_linux_eabi
-dynamic-linker /lib/ld-linux.so.3 <<<<<<<<<<
Problem #2 : All libraries
have to be of the cross toolchain!
-o a.out
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crt1.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crti.o
crtbegin.o <<<<<<<<<< Problem #3 : All libraries
have to be of the cross
toolchain!
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
needs to be used!!!)
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/lib
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib
-plugin
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/LLVMgold.so
<<<<<<<<<< Problem #4 : There is no LLVMgold.so in
llvm/clang bin/
hello.o
-lgcc
--as-needed
-lgcc_s
--no-as-needed
-lc
-lgcc
--as-needed
-lgcc_s
--no-as-needed
crtend.o <<<<<<<<<< Problem #5 : All libraries
have to be of the cross
toolchain!
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
needs to be used!!!)
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crtn.o

/usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi
Supported emulations: elf_i386 i386linux elf32_x86_64 elf_x86_64 elf_l1om
elf_k1om
clang: error: linker command failed with exit code 1 (use -v to see
invocation)


Problem #1 : wrong linker! ld in cross toolchain is needed!
Problem #2 : All libraries have to be of the cross toolchain!
Problem #3 : All libraries have to be of the cross toolchain!
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
needs to be used!!!)
Problem #4 : There is no LLVMgold.so in llvm/clang bin/
Problem #5 : All libraries have to be of the cross toolchain!
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
needs to be used!!!)


Workaround #1 : tried to run
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/bin/ld
manually.
Workaround #2 : Ignored this library in this manual run.
Workaround #3 :
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
used instead.
Workaround #4 : Ignored this library in this manual run.
Workaround #5 :
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
used instead.



[Workaround - Manual Run]
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-z relro -X --hash-style=gnu --build-id --eh-frame-hdr -m armelf_linux_eabi
-o a.out
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crt1.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crti.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/lib
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib
hello.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crtn.o

[Output]
hello.o: file not recognized: File format not recognized

[Test]
"file hello.o" prints out :
hello.o: LLVM bitcode

[Question]
2. Am I using a wrong cross toolchain? Doesn't feeding LLVM bitcode to the
ARM cross linker make sense?



Thank you very much.

Sincerely
Journeyer J. Joh




2012/6/19 Anton Korobeynikov <anton at korobeynikov.info>
> Hello
>
> > ./clang -v -emit-llvm -ccc-host-triple arm-none-linux-gnueabi
> > -I/home/hum/Documents/Projects/llvm_clang/gnuarm-4.0.2/arm-elf/include
> > -L/home/hum/Documents/Projects/llvm_clang/gnuarm-4.0.2/arm-elf/bin
> hello.c
> You forgot about sysroot here.
>
> > /home/hum/Documents/Projects/llvm_clang/gnuarm-4.0.2/arm-elf/bin/ld:
> > unrecognised emulation mode: armelf_linux_eabi
> > Supported emulations: armelf
> 1. Your ld is too old
> 2. Your ld was built for arm-elf, not arm-linux-eabi
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>


-- 
----------------------------------------
Journeyer J. Joh
o o s a p r o g r a m m e r
a t
g m a i l  d o t  c o m
----------------------------------------
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Hello,

Please ignore my previous email.
I received the final binary with command below.
I had to get rid of the option, -emit-llvm.

./clang -v --save-temps -ccc-host-triple arm-none-linux-gnueabi
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
hello.c

file hello.i
hello.i: ASCII C program text

file hello.s
hello.s: ASCII assembler program text

/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-as
-mfloat-abi=softfp -o hello.o hello.s

file hello.o
hello.o: ELF 32-bit LSB relocatable, ARM, version 1 (SYSV), not stripped

/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-z relro -X --hash-style=gnu --build-id --eh-frame-hdr -m armelf_linux_eabi
-o a.out
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crt1.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crti.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/lib
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t
hello.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crtn.o

file a.out
a.out: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked
(uses shared libs), for GNU/Linux 2.6.16,
BuildID[sha1]=0x7825ca07341b2f337c4f10b5711055c997820a9c, not stripped


The only thing remained is to specify the cross tool chain location to the
clang so that clang uses cross-as and ld automatically.

If someone provide these information, it would be welcomed!

Thank you very much.

Journeyer J. Joh



2012/6/20 Journeyer J. Joh <oosaprogrammer at gmail.com>
> Hello,
>
> Thank you for your kind attention to my issue and your help.
>
> I changed the tool chain and tried again. And there is a little progress
> but still have some problem.
>
> Using --sysroot doesn't make clang use linker(ld) in the cross tool.
> Most important question is how I can make clang use cross tool linker.
>
> Let me show you my experiment and questions below.
> There are two questions.
>
> [Run]
> ./clang -v --save-temps -emit-llvm -ccc-host-triple arm-none-linux-gnueabi
>
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
> hello.c
>
> [Question]
> 1. How am I supposed to use --sysroot? Though I used "--sysroot"
above,
> Clang uses native linker, "/usr/bin/ld" not the one in the tool
chain,
>
"/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld".
>
> [Output]
> clang version 3.2 (trunk 158784)
> Target: arm-none-linux-gnueabi
> Thread model: posix
>
>
"/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/clang"
> -cc1
> -triple armv4t-none-linux-gnueabi
> -E
> -disable-free
> -main-file-name hello.c
> -mrelocation-model static
> -mdisable-fp-elim
> -fmath-errno
> -mconstructor-aliases
> -target-abi aapcs-linux
> -target-cpu arm7tdmi
> -mfloat-abi soft
> -target-feature +soft-float-abi
> -target-linker-version 2.22
> -momit-leaf-frame-pointer
> -v
> -resource-dir
>
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2
> -isysroot
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
> -fmodule-cache-path /var/tmp/clang-module-cache
> -internal-isystem
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/local/include
> -internal-isystem
>
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2/include
> -internal-externc-isystem
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/include
> -internal-externc-isystem
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/include
> -fno-dwarf-directory-asm
> -fdebug-compilation-dir
> /home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin
> -ferror-limit 19
> -fmessage-length 205
> -mstackrealign
> -fno-signed-char
> -fgnu-runtime
> -fobjc-runtime-has-arc
> -fobjc-runtime-has-weak
> -fobjc-fragile-abi
> -fdiagnostics-show-option
> -fcolor-diagnostics
>  -o hello.i
> -x c
> hello.c
>
> clang -cc1 version 3.2 based upon LLVM 3.2svn default target
> i386-pc-linux-gnu
> ignoring nonexistent directory
>
"/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/local/include"
> ignoring nonexistent directory
>
"/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/include"
> #include "..." search starts here:
> #include <...> search starts here:
>
> 
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2/include
>
> 
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/include
> End of search list.
>
>
>
"/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/clang"
> -cc1
> -triple armv4t-none-linux-gnueabi
> -emit-llvm-bc
> -disable-free
> -main-file-name hello.c
> -mrelocation-model static
> -mdisable-fp-elim
> -fmath-errno
> -mconstructor-aliases
> -target-abi aapcs-linux
> -target-cpu arm7tdmi
> -mfloat-abi soft
> -target-feature +soft-float-abi
> -target-linker-version 2.22
> -momit-leaf-frame-pointer
> -v
> -resource-dir
>
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/clang/3.2
> -fno-dwarf-directory-asm
> -fdebug-compilation
> -dir /home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin
> -ferror-limit 19
> -fmessage-length 205
> -mstackrealign
> -fno-signed-char
> -fgnu-runtime
> -fobjc-runtime-has-arc
> -fobjc-runtime-has-weak
> -fobjc-fragile-abi
> -fdiagnostics-show-option
> -fcolor-diagnostics
>  -o hello.o
> -x cpp-output
> hello.i
>
> clang -cc1 version 3.2 based upon LLVM 3.2svn default target
> i386-pc-linux-gnu
> #include "..." search starts here:
> End of search list.
>
>
> "/usr/bin/ld" <<<<<<<<<< Problem #1
: wrong linker! ld in cross toolchain
> is needed!
>
>
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
> -z relro
> -X
> --hash-style=gnu
> --build-id
> --eh-frame-hdr
> -m armelf_linux_eabi
> -dynamic-linker /lib/ld-linux.so.3 <<<<<<<<<<
Problem #2 : All libraries
> have to be of the cross toolchain!
> -o a.out
>
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crt1.o
>
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crti.o
> crtbegin.o <<<<<<<<<< Problem #3 : All
libraries have to be of the cross
> toolchain!
>
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
> needs to be used!!!)
>
>
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/lib
>
>
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib
> -plugin
>
/home/hum/Documents/Projects/clang_llvm/build/Debug+Asserts/bin/../lib/LLVMgold.so
> <<<<<<<<<< Problem #4 : There is no
LLVMgold.so in llvm/clang bin/
> hello.o
> -lgcc
> --as-needed
> -lgcc_s
> --no-as-needed
> -lc
> -lgcc
> --as-needed
> -lgcc_s
> --no-as-needed
> crtend.o <<<<<<<<<< Problem #5 : All
libraries have to be of the cross
> toolchain!
>
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
> needs to be used!!!)
>
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crtn.o
>
> /usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi
> Supported emulations: elf_i386 i386linux elf32_x86_64 elf_x86_64 elf_l1om
> elf_k1om
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
>
> Problem #1 : wrong linker! ld in cross toolchain is needed!
> Problem #2 : All libraries have to be of the cross toolchain!
> Problem #3 : All libraries have to be of the cross toolchain!
>
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
> needs to be used!!!)
> Problem #4 : There is no LLVMgold.so in llvm/clang bin/
> Problem #5 : All libraries have to be of the cross toolchain!
>
(/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
> needs to be used!!!)
>
>
> Workaround #1 : tried to run
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/bin/ld
> manually.
> Workaround #2 : Ignored this library in this manual run.
> Workaround #3 :
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
> used instead.
> Workaround #4 : Ignored this library in this manual run.
> Workaround #5 :
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
> used instead.
>
>
>
> [Workaround - Manual Run]
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld
>
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
> -z relro -X --hash-style=gnu --build-id --eh-frame-hdr -m armelf_linux_eabi
> -o a.out
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crt1.o
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crti.o
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtbegin.o
>
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/lib
>
-L/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib
> hello.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
> -lgcc_s --no-as-needed
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/lib/gcc/arm-none-linux-gnueabi/4.5.1/armv4t/crtend.o
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc/usr/lib/crtn.o
>
> [Output]
> hello.o: file not recognized: File format not recognized
>
> [Test]
> "file hello.o" prints out :
> hello.o: LLVM bitcode
>
> [Question]
> 2. Am I using a wrong cross toolchain? Doesn't feeding LLVM bitcode to
the
> ARM cross linker make sense?
>
>
>
> Thank you very much.
>
> Sincerely
> Journeyer J. Joh
>
>
>
>
> 2012/6/19 Anton Korobeynikov <anton at korobeynikov.info>
>
>> Hello
>>
>> > ./clang -v -emit-llvm -ccc-host-triple arm-none-linux-gnueabi
>> >
-I/home/hum/Documents/Projects/llvm_clang/gnuarm-4.0.2/arm-elf/include
>> > -L/home/hum/Documents/Projects/llvm_clang/gnuarm-4.0.2/arm-elf/bin
>> hello.c
>> You forgot about sysroot here.
>>
>> >
/home/hum/Documents/Projects/llvm_clang/gnuarm-4.0.2/arm-elf/bin/ld:
>> > unrecognised emulation mode: armelf_linux_eabi
>> > Supported emulations: armelf
>> 1. Your ld is too old
>> 2. Your ld was built for arm-elf, not arm-linux-eabi
>>
>> --
>> With best regards, Anton Korobeynikov
>> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>>
>
>
>
> --
> ----------------------------------------
> Journeyer J. Joh
> o o s a p r o g r a m m e r
> a t
> g m a i l  d o t  c o m
> ----------------------------------------
>
>

-- 
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o o s a p r o g r a m m e r
a t
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Hi Joerg,

Thank you very much!

I finally found a working command string to cross-compile for ARM on x86.

./clang -v --save-temps -ccc-host-triple arm-none-linux-gnueabi
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-gcc-toolchain /home/hum/Documents/Projects/arm_toolchain/arm-2010.09
hello.c -o hello

Above works fine! Important options are

-ccc-host-triple arm-none-linux-gnueabi
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-gcc-toolchain /home/hum/Documents/Projects/arm_toolchain/arm-2010.09

And the environment variable PATH doesn't need to be changed.

Thank you everyone who answered for my questions.

Regards
Journeyer J. Joh

2012/6/20 Joerg Sonnenberger <joerg at britannica.bec.de>
> On Wed, Jun 20, 2012 at 05:59:07PM +0900, Journeyer J. Joh wrote:
> >
>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld
>
> Make sure the directory is in PATH, it will pick up LD automatically
> then.
>
> Joerg
>


-- 
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a t
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Hello,

With your kind concern and help, I now can make a binary for ARM target.

./clang -v --save-temps -ccc-host-triple arm-none-linux-gnueabi
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
-gcc-toolchain /home/hum/Documents/Projects/arm_toolchain/arm-2010.09
hello.c -o hello

The build command is shown above.

After that, I prepared an ARM laptop, AC100 - TOSHIBA.
I installed Ubuntu 12.04 in the way guided from the link below.

https://wiki.ubuntu.com/ARM/TEGRA/AC100

So I moved the final binary from host PC to AC100 and executed.
But the binary DIDN'T RUN.

$./hello

returns an error message below.

bash: ./hello: No such file hello

I need to understand why it doesn't run on ARM laptop.

I compiled another sample program hi.c on the ARM laptop and compared both
- the one cross compiled "hello" and the other self host compiled
"hi".

Output message of utility "file" is almost the same except Linux
version,
one is 2.6.16 and the other is 2.6.31. But the output of "ldd" shows
something meaningful.

ldd hi
    libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6ecf000)
    /lib/ld-linux-armhf.so.3 (0xb6fc3000)

ldd hello
    not a dynamic executable


I guess I have to use a cross toolchain for my ARM target - AC 100. It has
been equipped with Ubuntu 12.04.


Could you provide me any hint to analize this problem?

Thank you in advance.

Journeyer J. Joh



2012/6/21 Journeyer J. Joh <oosaprogrammer at gmail.com>
> Hi Joerg,
>
> Thank you very much!
>
> I finally found a working command string to cross-compile for ARM on x86.
>
> ./clang -v --save-temps -ccc-host-triple arm-none-linux-gnueabi
>
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
> -gcc-toolchain /home/hum/Documents/Projects/arm_toolchain/arm-2010.09
> hello.c -o hello
>
> Above works fine! Important options are
>
> -ccc-host-triple arm-none-linux-gnueabi
>
>
--sysroot=/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/arm-none-linux-gnueabi/libc
> -gcc-toolchain /home/hum/Documents/Projects/arm_toolchain/arm-2010.09
>
> And the environment variable PATH doesn't need to be changed.
>
> Thank you everyone who answered for my questions.
>
> Regards
> Journeyer J. Joh
>
> 2012/6/20 Joerg Sonnenberger <joerg at britannica.bec.de>
>
>> On Wed, Jun 20, 2012 at 05:59:07PM +0900, Journeyer J. Joh wrote:
>> >
>>
/home/hum/Documents/Projects/arm_toolchain/arm-2010.09/bin/arm-none-linux-gnueabi-ld
>>
>> Make sure the directory is in PATH, it will pick up LD automatically
>> then.
>>
>> Joerg
>>
>
>
>
> --
> ----------------------------------------
> Journeyer J. Joh
> o o s a p r o g r a m m e r
> a t
> g m a i l  d o t  c o m
> ----------------------------------------
>
>

-- 
----------------------------------------
Journeyer J. Joh
o o s a p r o g r a m m e r
a t
g m a i l  d o t  c o m
----------------------------------------
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