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Re: Test case which displays problem found in libstdc++-v3 effort
- To: Jason Merrill <jason at cygnus dot com>
- Subject: Re: Test case which displays problem found in libstdc++-v3 effort
- From: Alan Modra <alan at linuxcare dot com dot au>
- Date: Tue, 20 Jun 2000 14:02:52 +1000 (EST)
- cc: Benjamin Kosnik <bkoz at redhat dot com>, binutils at sourceware dot cygnus dot com, libstdc++ at sourceware dot cygnus dot com
On 19 Jun 2000, Jason Merrill wrote:
> >>>>> Alan Modra <alan@linuxcare.com.au> writes:
>
> > It's a linker script bug. The linker needs to be told to keep the
> > .eh_frame contents. Lack of any reference to symbols defined in a
> > section normally causes --gc-sections to discard the section.
>
> I would think that the reference to __EH_FRAME_BEGIN__ from
> __do_global_ctors would satisfy the linker. Why doesn't it?
Because there doesn't seem to be any such reference. __main.o doesn't
have much in it on i586-linux. Everything is #ifdef'd out due to
HAS_INIT_SECTION and OBJECT_FORMAT_ELF being defined.
objdump --headers __main.o
__main.o: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000000 00000000 00000000 00000034 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 00000000 00000000 00000034 2**2
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000034 2**2
ALLOC
3 .note 00000014 00000000 00000000 00000034 2**0
CONTENTS, READONLY
4 .stab 00000ee8 00000000 00000000 00000048 2**2
CONTENTS, RELOC, READONLY, DEBUGGING
5 .stabstr 00002f51 00000000 00000000 00000f30 2**0
CONTENTS, READONLY, DEBUGGING
6 .comment 00000029 00000000 00000000 00003e81 2**0
CONTENTS, READONLY
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