/usr/lib/x86_64-linux-gnu/perl5/5.20/Wx/cpp/compat.h is in libwx-perl 1:0.9923-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Name: cpp/compat.h
// Purpose: some compatibility macros
// Author: Mattia Barbon
// Modified by:
// Created: 29/10/2000
// RCS-ID: $Id: compat.h 2532 2009-02-21 08:51:16Z mbarbon $
// Copyright: (c) 2000-2003, 2006, 2008-2009 Mattia Barbon
// Licence: This program is free software; you can redistribute it and/or
// modify it under the same terms as Perl itself
/////////////////////////////////////////////////////////////////////////////
#if !defined( PERL_REVISION ) && !defined( PATCHLEVEL )
#include <patchlevel.h>
#endif
// version < 5.6 does not define PERL_
#ifdef PERL_REVISION
#define WXPERL_P_VERSION_EQ( V, S, P ) \
( ( PERL_REVISION == (V) ) && ( PERL_VERSION == (S) ) && ( PERL_SUBVERSION == (P) ) )
#define WXPERL_P_VERSION_GE( V, S, P ) \
( ( PERL_REVISION > (V) ) || \
( PERL_REVISION == (V) && PERL_VERSION > (S) ) || \
( PERL_REVISION == (V) && PERL_VERSION == (S) && PERL_SUBVERSION >= (P) ) )
#else
#define WXPERL_P_VERSION_EQ( V, S, P ) \
( ( 5 == (V) ) && ( PATCHLEVEL == (S) ) && ( SUBVERSION == (P) ) )
#define WXPERL_P_VERSION_GE( V, S, P ) \
( ( 5 > (V) ) || \
( 5 == (V) && PATCHLEVEL > (S) ) || \
( 5 == (V) && PATCHLEVEL == (S) && SUBVERSION >= (P) ) )
#endif
#define WXPERL_P_VERSION_LT( V, S, P ) !WXPERL_P_VERSION_GE( V, S, P )
#define WXPERL_W_VERSION_EQ( V, S, P ) \
( wxMAJOR_VERSION == (V) && wxMINOR_VERSION == (S) && wxRELEASE_NUMBER == (P) )
#define WXPERL_W_VERSION_GE( V, S, P ) \
( ( wxMAJOR_VERSION > (V) ) || \
( wxMAJOR_VERSION == (V) && wxMINOR_VERSION > (S) ) || \
( wxMAJOR_VERSION == (V) && wxMINOR_VERSION == (S) && wxRELEASE_NUMBER >= (P) ) )
#define WXPERL_W_VERSION_LE( V, S, P ) \
( ( wxMAJOR_VERSION < (V) ) || \
( wxMAJOR_VERSION == (V) && wxMINOR_VERSION < (S) ) || \
( wxMAJOR_VERSION == (V) && wxMINOR_VERSION == (S) && wxRELEASE_NUMBER <= (P) ) )
#define WXPERL_W_VERSION_LT( V, S, P ) !WXPERL_W_VERSION_GE( V, S, P )
#if WXPERL_P_VERSION_GE( 5, 5, 0 ) && !WXPERL_P_VERSION_GE( 5, 6, 0 )
#define CHAR_P (char*)
#define get_sv perl_get_sv
#define get_av perl_get_av
#define call_sv perl_call_sv
#define eval_pv perl_eval_pv
#define call_method perl_call_method
#define require_pv perl_require_pv
#define call_argv perl_call_argv
#define newSVuv( val ) newSViv( (IV)(UV)val )
#define SvPV_nolen( s ) SvPV( (s), PL_na )
#endif
#if WXPERL_P_VERSION_GE( 5, 6, 0 )
#define CHAR_P
#else
#define vTHX
#define pTHX
#define aTHX
#define dTHX
#define pTHX_
#define aTHX_
#endif
#if WXPERL_P_VERSION_GE( 5, 8, 0 )
// XXX this is an hack
#include <config.h>
#undef HAS_CRYPT_R
#undef HAS_LOCALTIME_R
#endif
#ifndef PTR2IV
// from perl.h
/*
* The macros INT2PTR and NUM2PTR are (despite their names)
* bi-directional: they will convert int/float to or from pointers.
* However the conversion to int/float are named explicitly:
* PTR2IV, PTR2UV, PTR2NV.
*
* For int conversions we do not need two casts if pointers are
* the same size as IV and UV. Otherwise we need an explicit
* cast (PTRV) to avoid compiler warnings.
*/
#if (IVSIZE == PTRSIZE) && (UVSIZE == PTRSIZE)
# define PTRV UV
# define INT2PTR(any,d) (any)(d)
#else
# if PTRSIZE == LONGSIZE
# define PTRV unsigned long
# else
# define PTRV unsigned
# endif
# define INT2PTR(any,d) (any)(PTRV)(d)
#endif
#define NUM2PTR(any,d) (any)(PTRV)(d)
#define PTR2IV(p) INT2PTR(IV,p)
#define PTR2UV(p) INT2PTR(UV,p)
#define PTR2NV(p) NUM2PTR(NV,p)
#endif
#define WXINTL_NO_GETTEXT_MACRO 1
#if defined(__WXMSW__)
# if WXPERL_P_VERSION_GE( 5, 6, 0 )
# define WXXS( name ) __declspec(dllexport) void name( pTHXo_ CV* cv )
# else
# ifdef PERL_OBJECT
# define WXXS( name ) __declspec( dllexport ) void name(CV* cv, CPerlObj* pPerl)
# else
# define WXXS( name ) __declspec( dllexport ) void name(CV* cv)
# endif
# endif
#endif
#define WXPLDLL
#define NEEDS_PLI_HELPERS_STRUCT() \
defined( WXPL_EXT ) && !defined( WXPL_STATIC ) && !defined(__WXMAC__)
#if NEEDS_PLI_HELPERS_STRUCT()
# define FUNCPTR( name ) ( * name )
#else
# define FUNCPTR( name ) name
#endif
// puts extern "C" around perl headers
#if defined(__CYGWIN__)
#define WXPL_EXTERN_C_START extern "C" {
#define WXPL_EXTERN_C_END }
#else
#define WXPL_EXTERN_C_START
#define WXPL_EXTERN_C_END
#endif
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