R devel - Aug 1998 - Problem in "configure" for Solaris (cc) ?!

[[0.62.3, already 0.62.2]]

This bug report is overdue,
but I really didn't test these things for weeks 
(have always used gcc, but only yesterday, someone told me that he saw a
speed gain of a factor 2 when using Sun's cc over gcc)

I just found that the same problem is already in 0.62.2

If I take yesterday's  
	R-release.tar.gz  (or also R-0.62.2.tar.gz)
unpack
and add
	CC=cc
	-----
to  config.site,
then
	./configure
	-----------
it ends VERY badly:

% ./configure
creating cache ./config.cache
checking for a BSD compatible install... /usr/local/bin/ginstall -c
checking whether ln -s works... yes
checking for ranlib... ranlib
checking for bison... bison -y
checking for ar... ar
checking for ratfor... ratfor
checking for latex... /afs/ethz.ch/public/teTeX/teTeX/bin/sparc-solaris2.5/latex
checking for dvips... /afs/ethz.ch/public/teTeX/teTeX/bin/sparc-solaris2.5/dvips
checking for perl... /usr/local/bin/perl
checking whether perl is perl 5... yes
checking for cc... cc
checking for ranlib... (cached) ranlib
checking for f77... f77
checking for underscore after Fortran symbols... configure: error: Nothing
worked - cannot use FORTRAN

-----------
and then  STOP, nothing, ....

When I omit the "CC=cc", gcc is used (together with f77), and all is
well.

  % cc -V
  cc: SC3.0.1 13 Jul 1994
  usage: cc [ options] files.  Use 'cc -flags' for details

  % f77 -V
  f77: SC3.0.1 13 Jul 1994
  Usage: f77 [ options ] files.  Use 'f77 -flags' for details

  % uname -a
  SunOS florence 5.5 Generic sun4u sparc SUNW,Ultra-1

------------------------------------------------

So yes, the  SC.. compilers are somewhat dated, but still...

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(answering myself, after a suggestion by Kurt Hornik
		 which actually was *not* the solution.. but...)

The configure problem I've just reported
(( setting   CC=cc  in  config.site ))

actually does not show when I either leave the CFLAGS commented out
(which results in CFLAGS=-g) or set CFLAGS="-g -O",

however, it *DOES* show when I set
	CFLAGS=-O2 or CFLAGS="-g -O2"

----

Reading the long output of  ``cc -flags'',
I see that more than average optimization is done using
	cc -xO[1-4]
	    #
Still very funny that "-O2" leads to such bad results with
./configure.
Maybe configure could become smarter here...

Martin
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