xref: /openbsd-src/gnu/usr.bin/binutils-2.17/include/symcat.h (revision 3d8817e467ea46cf4772788d6804dd293abfb01a)
1*3d8817e4Smiod /* Symbol concatenation utilities.
2*3d8817e4Smiod 
3*3d8817e4Smiod    Copyright (C) 1998, 2000 Free Software Foundation, Inc.
4*3d8817e4Smiod 
5*3d8817e4Smiod    This program is free software; you can redistribute it and/or modify
6*3d8817e4Smiod    it under the terms of the GNU General Public License as published by
7*3d8817e4Smiod    the Free Software Foundation; either version 2 of the License, or
8*3d8817e4Smiod    (at your option) any later version.
9*3d8817e4Smiod 
10*3d8817e4Smiod    This program is distributed in the hope that it will be useful,
11*3d8817e4Smiod    but WITHOUT ANY WARRANTY; without even the implied warranty of
12*3d8817e4Smiod    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13*3d8817e4Smiod    GNU General Public License for more details.
14*3d8817e4Smiod 
15*3d8817e4Smiod    You should have received a copy of the GNU General Public License along
16*3d8817e4Smiod    with this program; if not, write to the Free Software Foundation, Inc.,
17*3d8817e4Smiod    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
18*3d8817e4Smiod 
19*3d8817e4Smiod #ifndef SYM_CAT_H
20*3d8817e4Smiod #define SYM_CAT_H
21*3d8817e4Smiod 
22*3d8817e4Smiod #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
23*3d8817e4Smiod #define CONCAT2(a,b)	 a##b
24*3d8817e4Smiod #define CONCAT3(a,b,c)	 a##b##c
25*3d8817e4Smiod #define CONCAT4(a,b,c,d) a##b##c##d
26*3d8817e4Smiod #define STRINGX(s) #s
27*3d8817e4Smiod #else
28*3d8817e4Smiod /* Note one should never pass extra whitespace to the CONCATn macros,
29*3d8817e4Smiod    e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
30*3d8817e4Smiod    the two labels instead of concatenating them.  Instead, make sure to
31*3d8817e4Smiod    write CONCAT2(foo,bar).  */
32*3d8817e4Smiod #define CONCAT2(a,b)	 a/**/b
33*3d8817e4Smiod #define CONCAT3(a,b,c)	 a/**/b/**/c
34*3d8817e4Smiod #define CONCAT4(a,b,c,d) a/**/b/**/c/**/d
35*3d8817e4Smiod #define STRINGX(s) "s"
36*3d8817e4Smiod #endif
37*3d8817e4Smiod 
38*3d8817e4Smiod #define XCONCAT2(a,b)     CONCAT2(a,b)
39*3d8817e4Smiod #define XCONCAT3(a,b,c)   CONCAT3(a,b,c)
40*3d8817e4Smiod #define XCONCAT4(a,b,c,d) CONCAT4(a,b,c,d)
41*3d8817e4Smiod 
42*3d8817e4Smiod /* Note the layer of indirection here is typically used to allow
43*3d8817e4Smiod    stringification of the expansion of macros.  I.e. "#define foo
44*3d8817e4Smiod    bar", "XSTRING(foo)", to yield "bar".  Be aware that this only
45*3d8817e4Smiod    works for __STDC__, not for traditional C which will still resolve
46*3d8817e4Smiod    to "foo".  */
47*3d8817e4Smiod #define XSTRING(s) STRINGX(s)
48*3d8817e4Smiod 
49*3d8817e4Smiod #endif /* SYM_CAT_H */
50