Cross compiling for Linux on Windows (ld linker output file won't run as executable on linux and has undefined symbols)

Kim soldoutseashell@gmail.com
Wed Apr 23 04:52:00 GMT 2014 

I'm trying to set up a cross compile for linux ELF files on Windows 
using clang and a version of ld which has been compiled to have elf64 
support. The clang compile part is fine, it outputs ELF obj files that 
work when linked on linux. My test case cpp is just main containing a 
printf statement.

To attempt a link on windows I copied over all of the libraries from my 
ubuntu install and specified the ones that are needed as linker 
arguments in the right order (as they appear on the ld invocation 
performed by g++). The problem is, the output file is slightly different 
than the one produced on linux and it won't run as an executable. I 
noticed, for example, that in the version linked on windows there is the 
undefined symbol "printf" which appears to have become "puts" instead in 
the linux version.

Anyway I'm wondering if anyone knows what is happening here.



Linking on linux:

==================================================
attempt to open 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o
attempt to open 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o
attempt to open Test.o succeeded
Test.o
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.so succeeded
-lstdc++ (/usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.so)
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libm.so failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libm.a failed
attempt to open 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libm.so 
succeeded
-lm (/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libm.so)
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc_s.so succeeded
-lgcc_s (/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc_s.so)
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.a succeeded
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libc.so failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libc.a failed
attempt to open 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libc.so 
succeeded
opened script file 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libc.so
opened script file 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libc.so
attempt to open /lib/x86_64-linux-gnu/libc.so.6 succeeded
/lib/x86_64-linux-gnu/libc.so.6
attempt to open /usr/lib/x86_64-linux-gnu/libc_nonshared.a succeeded
(/usr/lib/x86_64-linux-gnu/libc_nonshared.a)elf-init.oS
attempt to open /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 succeeded
/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc_s.so succeeded
-lgcc_s (/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc_s.so)
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.a succeeded
attempt to open /usr/lib/gcc/x86_64-linux-gnu/4.8/crtend.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/4.8/crtend.o
attempt to open 
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o succeeded
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o
ld-linux-x86-64.so.2 needed by /lib/x86_64-linux-gnu/libc.so.6
found ld-linux-x86-64.so.2 at /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2




nm output on linux:

k@system:/shared$ nm ./Test
0000000000601040 B __bss_start
0000000000601040 b completed.6992
0000000000601030 D __data_start
0000000000601030 W data_start
0000000000400470 t deregister_tm_clones
00000000004004e0 t __do_global_dtors_aux
0000000000600e18 t __do_global_dtors_aux_fini_array_entry
0000000000601038 D __dso_handle
0000000000600e28 d _DYNAMIC
0000000000601040 D _edata
0000000000601048 B _end
00000000004005e4 T _fini
0000000000400500 t frame_dummy
0000000000600e10 t __frame_dummy_init_array_entry
0000000000400718 r __FRAME_END__
0000000000601000 d _GLOBAL_OFFSET_TABLE_
                  w __gmon_start__
00000000004003e0 T _init
0000000000600e18 t __init_array_end
0000000000600e10 t __init_array_start
00000000004005f0 R _IO_stdin_used
                  w _ITM_deregisterTMCloneTable
                  w _ITM_registerTMCloneTable
0000000000600e20 d __JCR_END__
0000000000600e20 d __JCR_LIST__
                  w _Jv_RegisterClasses
00000000004005e0 T __libc_csu_fini
0000000000400550 T __libc_csu_init
                  U __libc_start_main@@GLIBC_2.2.5
000000000040052d T main
                  U puts@@GLIBC_2.2.5
00000000004004a0 t register_tm_clones
0000000000400440 T _start
0000000000601040 D __TMC_END__





Linking on Windows:

==================================================
attempt to open I:\Linux\libs\lib\x86_64-linux-gnu\ld-2.17.so succeeded
I:\Linux\libs\lib\x86_64-linux-gnu\ld-2.17.so
attempt to open I:\Linux\lib\x86_64-linux-gnu\crt1.o succeeded
I:\Linux\lib\x86_64-linux-gnu\crt1.o
attempt to open I:\Linux\lib\x86_64-linux-gnu\crti.o succeeded
I:\Linux\lib\x86_64-linux-gnu\crti.o
attempt to open I:\Linux\gcc\x86_64-linux-gnu\4.8.1\crtbegin.o succeeded
I:\Linux\gcc\x86_64-linux-gnu\4.8.1\crtbegin.o
attempt to open Test.o succeeded
Test.o
attempt to open I:\Linux\lib\x86_64-linux-gnu\libstdc++.so.6.0.18 succeeded
I:\Linux\lib\x86_64-linux-gnu\libstdc++.so.6.0.18
attempt to open I:\Linux\libs\lib\x86_64-linux-gnu\libm-2.17.so succeeded
I:\Linux\libs\lib\x86_64-linux-gnu\libm-2.17.so
attempt to open I:\Linux\gcc\x86_64-linux-gnu\4.8.1\libgcc.a succeeded
attempt to open I:\Linux\lib\x86_64-linux-gnu\libc.so succeeded
opened script file I:\Linux\lib\x86_64-linux-gnu\libc.so
attempt to open /lib/x86_64-linux-gnu/libc.so.6 succeeded
/lib/x86_64-linux-gnu/libc.so.6
attempt to open /usr/lib/x86_64-linux-gnu/libc_nonshared.a succeeded
(I:/Linux/lib/x86_64-linux-gnu/libc_nonshared.a)elf-init.oS
attempt to open /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 succeeded
/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
attempt to open I:\Linux\lib\x86_64-linux-gnu\libc_nonshared.a succeeded
attempt to open I:\Linux\gcc\x86_64-linux-gnu\4.8.1\crtend.o succeeded
I:\Linux\gcc\x86_64-linux-gnu\4.8.1\crtend.o
attempt to open I:\Linux\lib\x86_64-linux-gnu\crtn.o succeeded
I:\Linux\lib\x86_64-linux-gnu\crtn.o
ld-linux-x86-64.so.2 needed by 
I:/Linux/libs/lib/x86_64-linux-gnu/libc-2.17.so
found ld-2.17.so at I:\Linux\libs\lib\x86_64-linux-gnu\ld-2.17.so




nm output of windows generated executable file

k@system:/shared$ nm ./Test
0000000000601040 B __bss_start
0000000000601040 b completed.6992
0000000000601030 D __data_start
0000000000601030 W data_start
0000000000400470 t deregister_tm_clones
00000000004004e0 t __do_global_dtors_aux
0000000000600e18 t __do_global_dtors_aux_fini_array_entry
0000000000601038 D __dso_handle
0000000000600e28 d _DYNAMIC
0000000000601040 D _edata
0000000000601048 B _end
00000000004005f4 T _fini
0000000000400500 t frame_dummy
0000000000600e10 t __frame_dummy_init_array_entry
0000000000400728 r __FRAME_END__
0000000000601000 d _GLOBAL_OFFSET_TABLE_
                  w __gmon_start__
00000000004003d8 T _init
0000000000600e18 t __init_array_end
0000000000600e10 t __init_array_start
0000000000400600 R _IO_stdin_used
                  w _ITM_deregisterTMCloneTable
                  w _ITM_registerTMCloneTable
0000000000600e20 d __JCR_END__
0000000000600e20 d __JCR_LIST__
                  w _Jv_RegisterClasses
00000000004005f0 T __libc_csu_fini
0000000000400560 T __libc_csu_init
                  U __libc_start_main@@GLIBC_2.2.5
0000000000400530 T main
                  U printf@@GLIBC_2.2.5
00000000004004a0 t register_tm_clones
0000000000400440 T _start
0000000000601040 D __TMC_END__
k@system:/shared$ ./Test
bash: ./Test: No such file or dire

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