[ECOS] SWtools g++ usage question

[ECOS] SWtools g++ usage question

[John Mills]

Greetings - I'm new to cross-platform 'gcc' and to C++, so this is probably
a simple question: sorry it is more a 'g++' than an eCos question. Sorry
also if this is excessive detail.

I have a simple program - one "real" object and the three or so supporting
files to target an embedded processor (SH-2). It compiles and links
perfectly
when compiling with <target>-gcc.

If I change main's name from <name>.c to <name>.cpp (with no changes to the
other files) and recompile that object with <target>-g++, the link fails
with an unresolved label "__main()".  <sample>.cpp includes both a
'main(void)' (the actual 'C' entry), and also a reference line: 'int
__main(){}' which I inherited in my example. Commenting-out either 'main'
reference doesn't seem to change the error. I suppose this is must be a FAQ,
but I would be grateful for any explanation.

I'm working with 'ecosSWtools-990319', built under RH6.0. It is not a full
eCos tools build (I don't have 'sh-hms-gdb'), but the essentials seem to
have built: I compiled my 'C' main, assembled all, and linked an executable,
then exported source and executable to a WinNT box where I downloaded and
debugged -- stepping through source while running in off-board hardware
[EDK7045F] -- under Hitachi's IDE (which may or may not have used 'gdb' to
debug).

TIA for any suggestions. I'll be happy to provide more details to anyone.

Regards -

  John Mills, Sr. Software Engineer
  TGA Technologies, Inc.
  100 Pinnacle Way, Suite 140
  e-mail: jmills@tga.com
  Norcross, GA 30071-3633
  Phone: 770-421-2100 ext.124 (voice)
         770-449-7740 (FAX)