Re: BFD bug with elf*-sparc sections?

[Eric Botcazou]

> Yes it does.  I wonder how it is implemented differently than objcopy
> and objdump...

My understanding is that objcopy has far less knowledge about the ELF format 
than readelf, and in particular about section group like item #3.

> Anyway, the bug I am reporting is that using objcopy (even just to
> duplicate a .o file) is making SunPro C++ objects unlinkable.

May I ask you why you need to use Binutils with SunPro C++?  AFAIK Sun doesn't 
implement the common C++ ABI.

> Using the source files and Makefile I posted to the web:
> http://www.cs.cornell.edu/marques/bfdexample/a.cxx
> http://www.cs.cornell.edu/marques/bfdexample/c.cxx
> http://www.cs.cornell.edu/marques/bfdexample/Makefile
>
>
> address@hidden objcopy_bug]$ gmake final1
> Test without using objcopy
> CC -xarch=v8plusb -c a.cxx
> CC -xarch=v8plusb -c c.cxx
> CC -xarch=v8plusb a.o c.o -o final1
>
> Test completed
>
> address@hidden objcopy_bug]$ gmake final2
> Test with using objcopy
> CC -xarch=v8plusb -c a.cxx
> CC -xarch=v8plusb -c c.cxx
> objcopy a.o
> objcopy c.o
> CC -xarch=v8plusb a.o c.o -o final1
> ld: fatal: symbol
> `std::basic_ostream<__type_0,__type_1>&std::endl<char,std::char_traits<char

objcopy appears to botch the section group:

Section Headers:
[Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
[ 0]                   NULL            00000000 000000 000000 00      0   0  0
[ 1] __1cDstdEendl4Ccn GROUP           00000000 000034 000008 04     11   4  4
[ 2] .text             PROGBITS        00000000 000040 000050 00  AX  0   0  8
[ 3] .rela.text        RELA            00000000 000c94 000060 0c     11   2  4
[ 4] .text%__1cDstdEen PROGBITS        00000000 000090 000040 00 AXG  0   0  8
[ 5] .rela.text%__1cDs RELA            00000000 000cf4 000018 0c     11   4  4
[ 6] .rodata           PROGBITS        00000000 0000d0 000002 00   A  0   0  1
[ 7] .comment          PROGBITS        00000000 0000d2 0005f1 00      0   0  1
[ 8] .stab.index       PROGBITS        00000000 0006c4 000024 0c      9   0  4
[ 9] .stab.indexstr    STRTAB          00000000 0006e8 0000a6 00      0   0  1
[10] .shstrtab         STRTAB          00000000 00078e 0000a3 00      0   0  1
[11] .symtab           SYMTAB          00000000 000a3c 000100 10     12   9  4
[12] .strtab           STRTAB          00000000 000b3c 000155 00      0   0  1

-- 
Eric Botcazou