* gcc not recognizing all C99 hex float constants
@ 2003-03-13 20:22 Michael Matz
2003-03-13 20:49 ` Neil Booth
0 siblings, 1 reply; 2+ messages in thread
From: Michael Matz @ 2003-03-13 20:22 UTC (permalink / raw)
To: gcc
Hi,
I noticed, that even in C99 mode gcc doesn't recognize all hexadecimal
floating point constants.
Compile this with "gcc -std=c99":
float f = 0x.9p0;
this gives the error
ppnumber.c:1:11: invalid suffix "x.9p0" on integer constant
This is because cppexp.c:cpp_classify_number() only wants to go to base 16
(after it sees "0x"), if the following char is a hex digit (i.e. it
doesn't like the '.').
6.4.4.2 explicitely mentions, that for a 'hexadecimal-fractional-constant'
the initial 'hexadecimal-digit-sequence' before '.' is optional.
Ciao,
Michael.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: gcc not recognizing all C99 hex float constants
2003-03-13 20:22 gcc not recognizing all C99 hex float constants Michael Matz
@ 2003-03-13 20:49 ` Neil Booth
0 siblings, 0 replies; 2+ messages in thread
From: Neil Booth @ 2003-03-13 20:49 UTC (permalink / raw)
To: Michael Matz; +Cc: gcc
Michael Matz wrote:-
> Hi,
>
> I noticed, that even in C99 mode gcc doesn't recognize all hexadecimal
> floating point constants.
>
> Compile this with "gcc -std=c99":
>
> float f = 0x.9p0;
>
> this gives the error
> ppnumber.c:1:11: invalid suffix "x.9p0" on integer constant
>
> This is because cppexp.c:cpp_classify_number() only wants to go to base 16
> (after it sees "0x"), if the following char is a hex digit (i.e. it
> doesn't like the '.').
Well spotted.
> 6.4.4.2 explicitely mentions, that for a 'hexadecimal-fractional-constant'
> the initial 'hexadecimal-digit-sequence' before '.' is optional.
Could you do the obvious patch (+ testcase)? I can do it, but you'll
have to wait a few days.
Neil.
^ permalink raw reply [flat|nested] 2+ messages in thread
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