include/unistring/inline.h

0001 /* Decision whether to use 'inline' or not.
0002    Copyright (C) 2006-2023 Free Software Foundation, Inc.
0003
0004    This program is free software: you can redistribute it and/or
0005    modify it under the terms of either:
0006
0007      * the GNU Lesser General Public License as published by the Free
0008        Software Foundation; either version 3 of the License, or (at your
0009        option) any later version.
0010
0011    or
0012
0013      * the GNU General Public License as published by the Free
0014        Software Foundation; either version 2 of the License, or (at your
0015        option) any later version.
0016
0017    or both in parallel, as here.
0018    This program is distributed in the hope that it will be useful,
0019    but WITHOUT ANY WARRANTY; without even the implied warranty of
0020    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0021    GNU Lesser General Public License for more details.
0022
0023    You should have received a copy of the GNU Lesser General Public License
0024    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
0025
0026 /* Written by Bruno Haible <bruno@clisp.org>, 2009.  */
0027
0028 #ifndef _UNISTRING_INLINE_H
0029 #define _UNISTRING_INLINE_H
0030
0031 /* This is like the gl_INLINE macro in gnulib/m4/inline.m4, but makes its
0032    decision based on defined preprocessor symbols rather than through
0033    autoconf tests.
0034    See <https://lists.gnu.org/archive/html/bug-gnulib/2006-11/msg00055.html>  */
0035
0036 /* Test for the 'inline' keyword or equivalent.  ISO C 99 semantics is not
0037    required, only that 'static inline' works.
0038    Define 'inline' to a supported equivalent, or to nothing if not supported,
0039    like AC_C_INLINE does.  Also, define UNISTRING_HAVE_INLINE if 'inline' or an
0040    equivalent is effectively supported, i.e. if the compiler is likely to
0041    drop unused 'static inline' functions.  */
0042
0043 #if defined __GNUC__ || defined __clang__
0044 /* GNU C/C++ or clang C/C++.  */
0045 # if defined __NO_INLINE__
0046 /* GCC and clang define __NO_INLINE__ if not optimizing or if -fno-inline is
0047    specified.  */
0048 #  define UNISTRING_HAVE_INLINE 0
0049 # else
0050 /* Whether 'inline' has the old GCC semantics or the ISO C 99 semantics,
0051    does not matter.  */
0052 #  define UNISTRING_HAVE_INLINE 1
0053 #  ifndef inline
0054 #   define inline __inline__
0055 #  endif
0056 # endif
0057 #elif defined __cplusplus
0058 /* Any other C++ compiler.  */
0059 # define UNISTRING_HAVE_INLINE 1
0060 #else
0061 /* Any other C compiler.  */
0062 # if defined __osf__
0063 /* OSF/1 cc has inline.  */
0064 #  define UNISTRING_HAVE_INLINE 1
0065 # elif defined _AIX || defined __sgi
0066 /* AIX 4 xlc, IRIX 6.5 cc have __inline.  */
0067 #  define UNISTRING_HAVE_INLINE 1
0068 #  ifndef inline
0069 #   define inline __inline
0070 #  endif
0071 # else
0072 /* Some older C compiler.  */
0073 #  define UNISTRING_HAVE_INLINE 0
0074 # endif
0075 #endif
0076
0077 #endif /* _UNISTRING_INLINE_H */