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From: David Dawes <dawes@physics.usyd.edu.au>
Message-Id: <199505071315.AA11889@physics.su.oz.au>
Subject: problem with f77 handling of '-u'
To: hackers@FreeBSD.org
Date: Sun, 7 May 1995 23:15:46 +1000 (EST)
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The f77 handling via 'cc' has a problem with the '-u' flag.

Eg, if I run:

  f77 -c -u a.f

I get:

cc: No input files

However:

  f77 -c -u -O a.f

works OK.

I've think I've tracked this down to the fact that '-u' is treated as a
switch letter that takes arguments in gcc.c:

#define SWITCH_TAKES_ARG(CHAR)      \
  ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
   || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
   || (CHAR) == 'I' || (CHAR) == 'm' \
   || (CHAR) == 'L' || (CHAR) == 'A')
#endif

If I remove 'u' from this, then the '-u' flag works as expected with f77.

f77.c also treats -u (and -U) as having arguments, but changing that
alone isn't enough to fix this problem.

Any ideas for a solution to this which doesn't break other things?
Maybe a long option needs to be added (as was done for -U), but that
breaks compatibility.

David