[LLVMdev] Setting up a cross-compiler for cortex-m3
salvatore benedetto
salvatore.benedetto at gmail.com
Wed Jul 18 07:46:54 PDT 2012
On Wed, Jul 18, 2012 at 4:31 PM, Renato Golin <rengolin at systemcall.org> wrote:
> On 18 July 2012 15:24, salvatore benedetto
> <salvatore.benedetto at gmail.com> wrote:
>> I'm not sure how to interpret the above output, but I don't understand
>> why if say -triple armv4t-none--gnueabi .
>
> Ok, we're getting there... ;)
Glad you are confident. :-)
> I think these errors are due to Clang not finding the
> libraries/includes/etc for the target you're building.
>
> If you have CodeSourcery's GCC, use that (via --sysroot or
> -ccc-gcc-name I said earlier), it's by far the easiest way.
emitrax at xartimequad:~/programming$ which arm-none-linux-gnueabi-g++
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-g++
emitrax at xartimequad:~/programming$ find
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/ -name libc
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc
$ clang++ -ccc-host-triple thumbv7m-none-gnueabi testReference.cpp -c
--sysroot=/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/
-v
clang version 3.2 (http://llvm.org/git/clang.git
88237bf587581026dcfc8386abf055cb201aa487)
(http://llvm.org/git/llvm.git
18a1b616ea123548b61a037c4f4fea4133aac1b5)
Target: thumbv7m-none--gnueabi
Thread model: posix
"/home/emitrax/bin/llvm/bin/clang" -cc1 -triple armv4t-none--gnueabi
-S -disable-free -main-file-name testReference.cpp -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
2.21.53.20110810 -momit-leaf-frame-pointer -v -coverage-file
/tmp/testReference-IcBmdF.s -resource-dir
/home/emitrax/bin/llvm/bin/../lib/clang/3.2 -isysroot
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/
-fmodule-cache-path /var/tmp/clang-module-cache -fdeprecated-macro
-fno-dwarf-directory-asm -fdebug-compilation-dir
/home/emitrax/programming -ferror-limit 19 -fmessage-length 106
-mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o
/tmp/testReference-IcBmdF.s -x c++ testReference.cpp
clang -cc1 version 3.2 based upon LLVM 3.2svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory
"/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc//usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
/home/emitrax/bin/llvm/bin/../lib/clang/3.2/include
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc//usr/include
End of search list.
"/usr/bin/g++"
--sysroot=/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/
-v -c -o testReference.o -x assembler /tmp/testReference-IcBmdF.s
Using built-in specs.
COLLECT_GCC=/usr/bin/g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.1-9ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin
--enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
COLLECT_GCC_OPTIONS='-v' '-c' '-o' 'testReference.o' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
as --64 -o testReference.o /tmp/testReference-IcBmdF.s
/tmp/testReference-IcBmdF.s: Assembler messages:
/tmp/testReference-IcBmdF.s:1: Error: unknown pseudo-op: `.syntax'
and so on..
> I'm not sure compiler-rt is ready for prime time (someone else might
> chip in), but that might be an alternative, though I have no idea how
> to use it.
I've also tried with a simpler source file without include statements
but I'm still getting errors.
$ clang++ -ccc-host-triple thumbv7m-none-gnueabi noInclude.cpp -c
--sysroot=/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/
-v
clang version 3.2 (http://llvm.org/git/clang.git
88237bf587581026dcfc8386abf055cb201aa487)
(http://llvm.org/git/llvm.git
18a1b616ea123548b61a037c4f4fea4133aac1b5)
Target: thumbv7m-none--gnueabi
Thread model: posix
"/home/emitrax/bin/llvm/bin/clang" -cc1 -triple armv4t-none--gnueabi
-S -disable-free -main-file-name noInclude.cpp -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
2.21.53.20110810 -momit-leaf-frame-pointer -v -coverage-file
/tmp/noInclude-YFkpA6.s -resource-dir
/home/emitrax/bin/llvm/bin/../lib/clang/3.2 -isysroot
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/
-fmodule-cache-path /var/tmp/clang-module-cache -fdeprecated-macro
-fno-dwarf-directory-asm -fdebug-compilation-dir
/home/emitrax/programming -ferror-limit 19 -fmessage-length 106
-mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o
/tmp/noInclude-YFkpA6.s -x c++ noInclude.cpp
clang -cc1 version 3.2 based upon LLVM 3.2svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory
"/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc//usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
/home/emitrax/bin/llvm/bin/../lib/clang/3.2/include
/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc//usr/include
End of search list.
"/usr/bin/g++"
--sysroot=/home/emitrax/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/
-v -c -o noInclude.o -x assembler /tmp/noInclude-YFkpA6.s
Using built-in specs.
COLLECT_GCC=/usr/bin/g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.1-9ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin
--enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
COLLECT_GCC_OPTIONS='-v' '-c' '-o' 'noInclude.o' '-shared-libgcc'
'-mtune=generic' '-march=x86-64' <------------------------------ Is
this correct?
as --64 -o noInclude.o /tmp/noInclude-YFkpA6.s
/tmp/noInclude-YFkpA6.s: Assembler messages:
/tmp/noInclude-YFkpA6.s:1: Error: unknown pseudo-op: `.syntax'
/tmp/noInclude-YFkpA6.s:2: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/noInclude-YFkpA6.s:3: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/noInclude-YFkpA6.s:4: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/noInclude-YFkpA6.s:5: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/noInclude-YFkpA6.s:6: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/noInclude-YFkpA6.s:13: Error: too many memory references for `sub'
/tmp/noInclude-YFkpA6.s:14: Error: expecting operand after ','; got nothing
/tmp/noInclude-YFkpA6.s:15: Error: invalid char '[' beginning operand 2 `[sp'
/tmp/noInclude-YFkpA6.s:16: Error: invalid char '[' beginning operand 2 `[sp'
/tmp/noInclude-YFkpA6.s:17: Error: invalid char '[' beginning operand 2 `[sp'
/tmp/noInclude-YFkpA6.s:18: Error: invalid char '[' beginning operand 2 `[sp'
/tmp/noInclude-YFkpA6.s:19: Error: too many memory references for `mov'
/tmp/noInclude-YFkpA6.s:20: Error: invalid char '[' beginning operand 2 `[sp]'
/tmp/noInclude-YFkpA6.s:21: Error: too many memory references for `add'
/tmp/noInclude-YFkpA6.s:22: Error: no such instruction: `bx lr'
clang: error: assembler (via gcc) command failed with exit code 1 (use
-v to see invocation)
$ cat noInclude.cpp
int main(int argc, char** argv)
{
return 0;
}
Any idea?
Thanks,
S.
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