[ECOS] Current gcc snapshot, -ffunction-sections

[ECOS] Current gcc snapshot, -ffunction-sections

[Chan Shih-Ping Richard]

The current gcc snapshot (20000117) doesn't seem
to add prefixes (.data., .rodata.) to data sections
when compiled with -ffunction-sections -fdata-sections.
(Target is sparclite-elf). 

I think I've isolated the problem to config/elfos.h
/* BTW: sec = 0 means prefix .text.
        sec = 1 means prefix .data.
        sec = 2 means prefix .rodata.
        sec = 3 means no prefix */

                                                                \
      if (TREE_CODE (DECL) == FUNCTION_DECL)                    \
        sec = 0;  /* .text. */                                  \
      else if (DECL_INITIAL (DECL) == 0                         \
               || DECL_INITIAL (DECL) == error_mark_node)       \
        sec = 3;   /* NO PREFIX!! */                            \
      else if (DECL_READONLY_SECTION (DECL, RELOC))             \
        sec = 1;  /* prefix .rodata. but never seem to get here */ \
      else                                                      \
        sec = 2;  /* prefix .data. but never seem to get here */ 

Can anyone explain why the first "else if" captures all
the .data and .rodata sections which result in no
prefix. (Symptom is that the assembler complains about
"symbol already defined".) The ecosSWtools of 3/99 doesn't
have a catch-all clause and prepends .text./.rodata./.data.
as necessary.

Removing the offending clause "seems" to work. The resulting
cross-compiler (gcc-20000117, binutils-20000117, newlib-1.8.2)
is able to build the tutorial and run simple tests.

-- 

Chan Shih-Ping (Richard) <cshihpin@dso.org.sg>
DSO National Laboratories
20 Science Park Drive
Singapore 118230

[ECOS] Re: Current gcc snapshot, -ffunction-sections

[Bart Veer]

>>>>> "Richard" == Chan Shih-Ping Richard <cshihpin@dso.org.sg> writes:

    Richard> The current gcc snapshot (20000117) doesn't seem
    Richard> to add prefixes (.data., .rodata.) to data sections
    Richard> when compiled with -ffunction-sections -fdata-sections.
    Richard> (Target is sparclite-elf). 

    <snip>

Thanks for this report. I am afraid that ecos-discuss is not really
the right forum for this, although it may help other eCos users who
are trying to use recent gcc snapshots. Few if any of the gcc
developers will monitor this mailing list - they have enough traffic
on their own mailing lists to keep themselves busy - and the eCos
maintainers have no special privileges when it comes to the gcc source
tree. The best mailing list for this issue is probably
gcc@gcc.gnu.org, see http://gcc.gnu.org/ for details.

Bart Veer // eCos net maintainer