1/* Decision whether to use 'inline' or not.
2   Copyright (C) 2006, 2009 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify it
5   under the terms of the GNU Lesser General Public License as published
6   by the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17/* Written by Bruno Haible <bruno@clisp.org>, 2009.  */
18
19#ifndef _UNISTRING_INLINE_H
20#define _UNISTRING_INLINE_H
21
22/* This is like the gl_INLINE macro in gnulib/m4/inline.m4, but makes its
23   decision based on defined preprocessor symbols rather than through
24   autoconf tests.
25   See <http://lists.gnu.org/archive/html/bug-gnulib/2006-11/msg00055.html>  */
26
27/* Test for the 'inline' keyword or equivalent.  ISO C 99 semantics is not
28   required, only that 'static inline' works.
29   Define 'inline' to a supported equivalent, or to nothing if not supported,
30   like AC_C_INLINE does.  Also, define UNISTRING_HAVE_INLINE if 'inline' or an
31   equivalent is effectively supported, i.e. if the compiler is likely to
32   drop unused 'static inline' functions.  */
33
34#if defined __GNUC__
35/* GNU C or GNU C++.  */
36# if defined __NO_INLINE__
37/* GCC defines __NO_INLINE__ if not optimizing or if -fno-inline is
38   specified.  */
39#  define UNISTRING_HAVE_INLINE 0
40# else
41/* Whether 'inline' has the old GCC semantics or the ISO C 99 semantics,
42   does not matter.  */
43#  define UNISTRING_HAVE_INLINE 1
44#  ifndef inline
45#   define inline __inline__
46#  endif
47# endif
48#elif defined __cplusplus
49/* Any other C++ compiler.  */
50# define UNISTRING_HAVE_INLINE 1
51#else
52/* Any other C compiler.  */
53# if defined __osf__
54/* OSF/1 cc has inline.  */
55#  define UNISTRING_HAVE_INLINE 1
56# elif defined _AIX || defined __sgi
57/* AIX 4 xlc, IRIX 6.5 cc have __inline.  */
58#  define UNISTRING_HAVE_INLINE 1
59#  ifndef inline
60#   define inline __inline
61#  endif
62# else
63/* Some older C compiler.  */
64#  define UNISTRING_HAVE_INLINE 0
65# endif
66#endif
67
68#endif /* _UNISTRING_INLINE_H */
69