[Bug fortran/27698] subroutine _foo draws "unclassifiable statement" instead of a useful error.

["aldot at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #10 from aldot at gcc dot gnu dot org  2006-11-05 17:16 -------
> IIRC, the use of $ is a Digital extension on VMS.  It's
> been more than 15 years since I used VMS, but I vaguely
> remmeber seeing Fortran with the $ only in the 2nd position.
> 
> But, if Intel (a Digital descented) accepts the leading
> dollar sign, then your suggested modification is probably
> correct.
> 

According to
http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=/com.ibm.xlf101l.doc/xlfopg/extnames.htm
the XL fortran accepts
" 
Both the underscore (_) and the dollar sign ($) are valid characters anywhere
in names.
"
While we currently have -fdollar-ok to accept the (invalid !) use of '$' in a
name, we don't provide means to accept (invalid !) names with a leading
underscore. This would of course only serve compatibility to IBM's xlf and,
perhaps, other compilers.

Disallowing a dollar sign as the very first character in a name even if
-fdollar-ok was requested by the user seems to be a simple omission to me.

Whether we want to allow for such invalid code for compatibility is beyond my
judgement, though.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27698