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ruby--ruby/dln.h
卜部昌平 4ff3f20540 add #include guard hack
According to MSVC manual (*1), cl.exe can skip including a header file
when that:

- contains #pragma once, or
- starts with #ifndef, or
- starts with #if ! defined.

GCC has a similar trick (*2), but it acts more stricter (e. g. there
must be _no tokens_ outside of #ifndef...#endif).

Sun C lacked #pragma once for a looong time.  Oracle Developer Studio
12.5 finally implemented it, but we cannot assume such recent version.

This changeset modifies header files so that each of them include
strictly one #ifndef...#endif.  I believe this is the most portable way
to trigger compiler optimizations. [Bug ]

*1: https://docs.microsoft.com/en-us/cpp/preprocessor/once
*2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
2020-04-13 16:06:00 +09:00

52 lines
1 KiB
C

#ifndef DLN_H
#define DLN_H
/**********************************************************************
dln.h -
$Author$
created at: Wed Jan 19 16:53:09 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#include "ruby/defines.h" /* for RUBY_SYMBOL_EXPORT_BEGIN */
#ifdef __cplusplus
# ifndef HAVE_PROTOTYPES
# define HAVE_PROTOTYPES 1
# endif
# ifndef HAVE_STDARG_PROTOTYPES
# define HAVE_STDARG_PROTOTYPES 1
# endif
#endif
#undef _
#ifdef HAVE_PROTOTYPES
# define _(args) args
#else
# define _(args) ()
#endif
RUBY_SYMBOL_EXPORT_BEGIN
#ifndef DLN_FIND_EXTRA_ARG
#define DLN_FIND_EXTRA_ARG
#endif
#ifndef DLN_FIND_EXTRA_ARG_DECL
#define DLN_FIND_EXTRA_ARG_DECL
#endif
char *dln_find_exe_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
char *dln_find_file_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
#ifdef USE_DLN_A_OUT
extern char *dln_argv0;
#endif
void *dln_load(const char*);
RUBY_SYMBOL_EXPORT_END
#endif