Re: Error messages I don't understand

["Bill McEnaney" <bill at rkirkpat dot net>]

Hi, Eljay,

Now I know what's going wrong.  My workstation is complaining because
the programmer tried to assign a value to an expanded macro, not to a
variable.  Since another gcc-help poster mentioned old, nonstandard
casting tricks that my worstation won't understand when it uses the
current version of gcc's C compiler, I'll just compile the program with
an old version of that compiler.  See what I get for always being up to
date.  :)

Cheers,
Bill

> Hi Bill,
> 
> What part of the error message don't you understand?
> 
> This kind of statement uses a valid lvalue, x:
> 
> int x;
> x = 2 + 3;
> 
> This kind of statement uses an invalid lvalue:
> 
> 5 = 2 + 3;
> 
> An lvalue is a value that can be assigned a value.  The term "lvalue"
means
> left value -- a value that can be on the left side of the assignment
> expression.
> 
> The code has a non-lvalue on the left side of the assignment expression.
> 
> Sincerely,
> --Eljay
> 
> 
> 
> 
> On 5/9/07 10:57 AM, "Bill McEnaney" <bill@rkirkpat.net> wrote:
> 
> > 
> > Hi, John,
> > 
> > Thanks.  Although it does help, I'm afraid it repeats what the messages
> > say.  I thought I would compile Progol with an older version of gcc's C
> > compiler because I've read transcripts of Progol sessions.  Since I have
> > read them, some compiler had compiled Progol.
> > 
> > By the way, I'm trying to compile an interpreter for the Progol
> > inductive-logic-programming language.  I do logic programming,
> > functional programming, and very little C programming.
> > 
> > Thanks again.
> > 
> > Bill
> >> Hi Bill,
> >> 
> >>> command.c: In function 'c_interp':
> >>> command.c:55: error: invalid lvalue in assignment
> >> 
> >> You have an invalid lvalue in your assignment on-or-near line 55.
> >> 
> >>> command.c: In function 'c_condition':
> >>> command.c:190: error: invalid lvalue in assignment
> >>> command.c:194: error: invalid lvalue in assignment
> >> 
> >> You have two more invalid lvalue in your assignments on-or-near
lines 190
> >> and 194.
> >> 
> >>> command.c: In function 'c_doall':
> >>> command.c:215: warning: incompatible implicit declaration of
> > built-in function
> >> 'strlen'
> >> 
> >> It appears you forgot to #include <string.h> at the top of your
command.c
> >> file.  Or your source re-declares strlen in an incompatible way.
> >> 
> >> HTH,
> >> --Eljay
> >> 
> >> 
> > 
> > ________________________________________________________________
> > Please visit a saintly hero.
> > http://www.jakemoore.org
> > 
> > "Pro-choice?"  Click here:
> > http://www.abortionno.com/Resources/pictures.html
> 
> 

________________________________________________________________
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