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Re: PATCH: Wno-warning-directives [WasRe: cpplib: Start moving ...]


On Tuesday, August 13, 2002, at 10:09  AM, Mark D. Baushke wrote:

Geoff Keating <geoffk@geoffk.org> writes:
Typically a #warning from a system header does indicate an error in
the use of that header.
No, a #warning from a system header indicates a warning. A #error
indicates an error.

On my FreeBSD desktop system at work I see warnings like this:

#warning "this file includes <malloc.h> which is deprecated, use <stdlib.h> instead"

#warning "this file includes <struct.h> which is deprecated, use <stddef.h> instead"

#warning "this file includes <values.h> which is obsoleted, use <limits.h> or <float.h> instead"

#warning "The information in this file should be obtained from <dirent.h>"
#warning "and is provided solely (and temporarily) for backward compatibility."

Just because the application writer wants to find stop 'real' warnings
specificied on the command line via -W<flagname> switches as errors,
does NOT mean that the #warning provided in a system header file should
be treated as an error without some way to turn it off.
I agree.

I proposed more general solution to this sort of problem in
<http://gcc.gnu.org/ml/gcc/2000-06/msg00639.html>.  An extension to
this would allow the user to say "if any warning comes from this file,
it's an error", something like
Hmmm... I have not been overly fond of #pragma directives in the past,
but I would like to see some way to modify how the warnings being
treated as errors mapping is being made. I do not know if this proposal
is the most general as it does require modifying sources which is not
always possible in some environments.
I agree on this one also.

-Devang


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