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Postings from March 2013
> But these definitions are conditional:
> #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
> # define MUTABLE_PTR(p) ({ void *_p = (p); _p; })
[...]
> I'm not sure I understand this. Is the author suggesting that bleadperl
> built with -pedantic-errors doesn't set PERL_GCC_PEDANTIC?
Apparently yes.
I admit I do not fully understand the chain of includes and their macros.
> Because:
> $ sh Configure -des -Dusedevel -Accflags="-pedantic-errors"
> $ make
> `sh cflags "optimize='-O2'" perlmini.o` -DPERL_IS_MINIPERL
> -DPERL_EXTERNAL_GLOB perlmini.c CCCMD = cc -DPERL_CORE -c
> -pedantic-errors -fno-strict-aliasing -pipe -fstack-protector
> -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2
> -Wall -DPERL_GCC_PEDANTIC
> (note the -DPERL_GCC_PEDANTIC on the command-line)
My perl is not built with -pedantic-errors,
it's only some tool from that module (which includes EXTERN.h and perl.h)
that is built with -std=c99 -pedantic-errors.
> Or, is the author's module being built on a non-pedantic perl, but it adds
> -pedantic-errors to the command line when building the module's source
> files?
Yes, I believe so.
> In which case, I don't think perl has ever added PERL_GCC_PEDANTIC
> to the command line or any include file.
So here is the rub it seems.
> Do you have a definite pass / transition, i.e. this module builds under
> 5.X, but doesn't build under 5.Y?
That module builds fine with perl-5.16.2, so I made a quick
and dirty test, without fully understanding what is going on
behind the scenes:
- unpacked the virgin tarballs of perl-5.16.2 and perl-5.17.9
each in its own directory
- copied a file config.h from my system's perl-5.16.2 which happens
to be installed on that host into each of ./perl-5.16.2 and
./perl-5.17.9
- created a tiny program 0.c, all it does is includes the EXTERN.h and perl.h:
#include "EXTERN.h"
#include "perl.h"
int main(int argc, char **argv) {}
So here is what happens:
$ cd ~/perl-5.16.2/
$ cc -I. -std=c99 -pedantic ~/0.c
perfect, no problems there.
Not so in 5.17.9:
$ cd ~/perl-5.17.9
$ cc -I. -std=c99 -pedantic ~/0.c
In file included from ./perl.h:3473,
from /home/mark/0.c:2:
./cv.h: In function 'S_CvGV':
./cv.h:194: warning: ISO C forbids braced-groups within expressions
./cv.h:196: warning: ISO C forbids braced-groups within expressions
./cv.h: In function 'CvNAME_HEK':
./cv.h:201: warning: ISO C forbids braced-groups within expressions
./cv.h:202: warning: ISO C forbids braced-groups within expressions
In file included from ./perl.h:5237,
from /home/mark/0.c:2:
./inline.h: In function 'S_av_top_index':
./inline.h:23: warning: ISO C forbids braced-groups within expressions
So it seems to me that your statement:
| In which case, I don't think perl has ever added PERL_GCC_PEDANTIC
| to the command line or any include file.
is the key here, but it just so happens that one can get away
despite this with 5.16.* .
Mark
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