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/* Decision whether to use 'inline' or not.
   Copyright (C) 2006, 2009 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2009.  */

#ifndef _UNISTRING_INLINE_H
#define _UNISTRING_INLINE_H

/* This is like the gl_INLINE macro in gnulib/m4/inline.m4, but makes its
   decision based on defined preprocessor symbols rather than through
   autoconf tests.
   See <http://lists.gnu.org/archive/html/bug-gnulib/2006-11/msg00055.html>  */

/* Test for the 'inline' keyword or equivalent.  ISO C 99 semantics is not
   required, only that 'static inline' works.
   Define 'inline' to a supported equivalent, or to nothing if not supported,
   like AC_C_INLINE does.  Also, define UNISTRING_HAVE_INLINE if 'inline' or an
   equivalent is effectively supported, i.e. if the compiler is likely to
   drop unused 'static inline' functions.  */

#if defined __GNUC__
/* GNU C or GNU C++.  */
# if defined __NO_INLINE__
/* GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is
   specified.  */
#  define UNISTRING_HAVE_INLINE 0
# else
/* Whether 'inline' has the old GCC semantics or the ISO C 99 semantics,
   does not matter.  */
#  define UNISTRING_HAVE_INLINE 1
#  ifndef inline
#   define inline __inline__
#  endif
# endif
#elif defined __cplusplus
/* Any other C++ compiler.  */
# define UNISTRING_HAVE_INLINE 1
#else
/* Any other C compiler.  */
# if defined __osf__
/* OSF/1 cc has inline.  */
#  define UNISTRING_HAVE_INLINE 1
# elif defined _AIX || defined __sgi
/* AIX 4 xlc, IRIX 6.5 cc have __inline.  */
#  define UNISTRING_HAVE_INLINE 1
#  ifndef inline
#   define inline __inline
#  endif
# else
/* Some older C compiler.  */
#  define UNISTRING_HAVE_INLINE 0
# endif
#endif

#endif /* _UNISTRING_INLINE_H */