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[perl #20636] ExtUtils::Constant trying to make empty #defines accessible
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From:
perlbug-followup
Date:
January 31, 2003 07:45
Subject:
[perl #20636] ExtUtils::Constant trying to make empty #defines accessible
Message ID:
rt-20636-49962.8.58688674848011@bugs6.perl.org
# New Ticket Created by tassilo.parseval@post.rwth-aachen.de
# Please include the string: [perl #20636]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=20636 >
This is a bug report for perl from tassilo.parseval@post.rwth-aachen.de,
generated with the help of perlbug 1.34 running under perl v5.8.0.
-----------------------------------------------------------------
[Please enter your report here]
When creating an extension skeleton using
h2xs -O -b <version> -n Module::Name header.h
it appears as though ExtUtils::Constant tries to make symbols exportable
that are merely #defined but have no value.
An excerpt from the header I've been using:
#ifndef __MPLIB_H
#define __MPLIB_H
#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif
and from the resulting constant-c.inc:
case 'L':
if (memEQ(name, "__END_DECLS", 11)) {
/* ^ */
#ifdef __END_DECLS
*iv_return = __END_DECLS;
return PERL_constant_ISIV;
#else
return PERL_constant_NOTDEF;
#endif
}
break;
Running this with 'gcc -E' this is preprocessed into:
case 'L':
if (memEQ(name, "__END_DECLS", 11)) {
*iv_return = ;
return 3 ;
}
break;
and will render the whole project uncompilable:
In file included from Mplib.xs:9:
const-c.inc: In function `constant':
const-c.inc:284: parse error before `;'
...
The above problem remains when removing the two offending symbols
(__BEGIN_DECLS and __END_DECLS) from the NAMES-list in
ExtUtils::Constant::WriteConstants() in Makefile.PL.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=library
severity=low
---
Site configuration information for perl v5.8.0:
Configured by root at Fri Jul 19 10:50:34 CEST 2002.
Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
Platform:
osname=linux, osvers=2.4.18, archname=i686-linux
uname='linux ethan 2.4.18 #1 tue feb 26 09:52:36 cet 2002 i686 unknown '
config_args=''
hint=previous, useposix=true, d_sigaction=define
usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=undef use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='gcc-3.0', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O3',
cppflags='-fno-strict-aliasing -I/usr/local/include -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
ccversion='', gccversion='3.0.4', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='gcc-3.0', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lnsl -lgdbm -ldbm -ldb -ldl -lm -lc -lcrypt -lutil
perllibs=-lnsl -ldl -lm -lc -lcrypt -lutil
libc=/lib/libc-2.2.5.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.2.5'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'
Locally applied patches:
---
@INC for perl v5.8.0:
/usr/opt/lib/perl5/5.8.0/i686-linux
/usr/opt/lib/perl5/5.8.0
/usr/opt/lib/perl5/site_perl/5.8.0/i686-linux
/usr/opt/lib/perl5/site_perl/5.8.0
/usr/opt/lib/perl5/site_perl
.
---
Environment for perl v5.8.0:
HOME=/home/ethan
LANG=C
LANGUAGE (unset)
LC_CTYPE=de_DE@euro
LD_LIBRARY_PATH=:/usr/local/j2sdk1.4.0/jre/lib/i386:/usr/local/pwlib/lib
LOGDIR (unset)
PATH=/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/local/jdk1.3.1/bin:/home/ethan/bin:/usr/games
PERL_BADLANG (unset)
SHELL=/bin/bash
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[perl #20636] ExtUtils::Constant trying to make empty #defines accessible
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