xref: /netbsd-src/external/bsd/tcpdump/dist/compiler-tests.h (revision d881c4745d72e49290b2df21fa0730ed970a047e)
1*d881c474Schristos /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
2*d881c474Schristos /*
3*d881c474Schristos  * Copyright (c) 1993, 1994, 1995, 1996, 1997
4*d881c474Schristos  *	The Regents of the University of California.  All rights reserved.
5*d881c474Schristos  *
6*d881c474Schristos  * Redistribution and use in source and binary forms, with or without
7*d881c474Schristos  * modification, are permitted provided that the following conditions
8*d881c474Schristos  * are met:
9*d881c474Schristos  * 1. Redistributions of source code must retain the above copyright
10*d881c474Schristos  *    notice, this list of conditions and the following disclaimer.
11*d881c474Schristos  * 2. Redistributions in binary form must reproduce the above copyright
12*d881c474Schristos  *    notice, this list of conditions and the following disclaimer in the
13*d881c474Schristos  *    documentation and/or other materials provided with the distribution.
14*d881c474Schristos  * 3. All advertising materials mentioning features or use of this software
15*d881c474Schristos  *    must display the following acknowledgement:
16*d881c474Schristos  *	This product includes software developed by the Computer Systems
17*d881c474Schristos  *	Engineering Group at Lawrence Berkeley Laboratory.
18*d881c474Schristos  * 4. Neither the name of the University nor of the Laboratory may be used
19*d881c474Schristos  *    to endorse or promote products derived from this software without
20*d881c474Schristos  *    specific prior written permission.
21*d881c474Schristos  *
22*d881c474Schristos  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23*d881c474Schristos  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24*d881c474Schristos  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25*d881c474Schristos  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26*d881c474Schristos  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27*d881c474Schristos  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28*d881c474Schristos  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29*d881c474Schristos  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30*d881c474Schristos  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31*d881c474Schristos  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32*d881c474Schristos  * SUCH DAMAGE.
33*d881c474Schristos  */
34*d881c474Schristos 
35*d881c474Schristos #ifndef nd_compiler_tests_h
36*d881c474Schristos #define nd_compiler_tests_h
37*d881c474Schristos 
38*d881c474Schristos /*
39*d881c474Schristos  * This was introduced by Clang:
40*d881c474Schristos  *
41*d881c474Schristos  *     https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
42*d881c474Schristos  *
43*d881c474Schristos  * in some version (which version?); it has been picked up by GCC 5.0.
44*d881c474Schristos  */
45*d881c474Schristos #ifndef __has_attribute
46*d881c474Schristos   /*
47*d881c474Schristos    * It's a macro, so you can check whether it's defined to check
48*d881c474Schristos    * whether it's supported.
49*d881c474Schristos    *
50*d881c474Schristos    * If it's not, define it to always return 0, so that we move on to
51*d881c474Schristos    * the fallback checks.
52*d881c474Schristos    */
53*d881c474Schristos   #define __has_attribute(x) 0
54*d881c474Schristos #endif
55*d881c474Schristos 
56*d881c474Schristos /*
57*d881c474Schristos  * Note that the C90 spec's "6.8.1 Conditional inclusion" and the
58*d881c474Schristos  * C99 spec's and C11 spec's "6.10.1 Conditional inclusion" say:
59*d881c474Schristos  *
60*d881c474Schristos  *    Prior to evaluation, macro invocations in the list of preprocessing
61*d881c474Schristos  *    tokens that will become the controlling constant expression are
62*d881c474Schristos  *    replaced (except for those macro names modified by the defined unary
63*d881c474Schristos  *    operator), just as in normal text.  If the token "defined" is
64*d881c474Schristos  *    generated as a result of this replacement process or use of the
65*d881c474Schristos  *    "defined" unary operator does not match one of the two specified
66*d881c474Schristos  *    forms prior to macro replacement, the behavior is undefined.
67*d881c474Schristos  *
68*d881c474Schristos  * so you shouldn't use defined() in a #define that's used in #if or
69*d881c474Schristos  * #elif.  Some versions of Clang, for example, will warn about this.
70*d881c474Schristos  *
71*d881c474Schristos  * Instead, we check whether the pre-defined macros for particular
72*d881c474Schristos  * compilers are defined and, if not, define the "is this version XXX
73*d881c474Schristos  * or a later version of this compiler" macros as 0.
74*d881c474Schristos  */
75*d881c474Schristos 
76*d881c474Schristos /*
77*d881c474Schristos  * Check whether this is GCC major.minor or a later release, or some
78*d881c474Schristos  * compiler that claims to be "just like GCC" of that version or a
79*d881c474Schristos  * later release.
80*d881c474Schristos  */
81*d881c474Schristos 
82*d881c474Schristos #if ! defined(__GNUC__)
83*d881c474Schristos   /* Not GCC and not "just like GCC" */
84*d881c474Schristos   #define ND_IS_AT_LEAST_GNUC_VERSION(major, minor) 0
85*d881c474Schristos #else
86*d881c474Schristos   /* GCC or "just like GCC" */
87*d881c474Schristos   #define ND_IS_AT_LEAST_GNUC_VERSION(major, minor) \
88*d881c474Schristos 	(__GNUC__ > (major) || \
89*d881c474Schristos 	 (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
90*d881c474Schristos #endif
91*d881c474Schristos 
92*d881c474Schristos /*
93*d881c474Schristos  * Check whether this is Clang major.minor or a later release.
94*d881c474Schristos  */
95*d881c474Schristos 
96*d881c474Schristos #if !defined(__clang__)
97*d881c474Schristos   /* Not Clang */
98*d881c474Schristos   #define ND_IS_AT_LEAST_CLANG_VERSION(major, minor) 0
99*d881c474Schristos #else
100*d881c474Schristos   /* Clang */
101*d881c474Schristos   #define ND_IS_AT_LEAST_CLANG_VERSION(major, minor) \
102*d881c474Schristos 	(__clang_major__ > (major) || \
103*d881c474Schristos 	 (__clang_major__ == (major) && __clang_minor__ >= (minor)))
104*d881c474Schristos #endif
105*d881c474Schristos 
106*d881c474Schristos /*
107*d881c474Schristos  * Check whether this is Sun C/SunPro C/Oracle Studio major.minor
108*d881c474Schristos  * or a later release.
109*d881c474Schristos  *
110*d881c474Schristos  * The version number in __SUNPRO_C is encoded in hex BCD, with the
111*d881c474Schristos  * uppermost hex digit being the major version number, the next
112*d881c474Schristos  * one or two hex digits being the minor version number, and
113*d881c474Schristos  * the last digit being the patch version.
114*d881c474Schristos  *
115*d881c474Schristos  * It represents the *compiler* version, not the product version;
116*d881c474Schristos  * see
117*d881c474Schristos  *
118*d881c474Schristos  *    https://sourceforge.net/p/predef/wiki/Compilers/
119*d881c474Schristos  *
120*d881c474Schristos  * for a partial mapping, which we assume continues for later
121*d881c474Schristos  * 12.x product releases.
122*d881c474Schristos  */
123*d881c474Schristos 
124*d881c474Schristos #if ! defined(__SUNPRO_C)
125*d881c474Schristos   /* Not Sun/Oracle C */
126*d881c474Schristos   #define ND_IS_AT_LEAST_SUNC_VERSION(major,minor) 0
127*d881c474Schristos #else
128*d881c474Schristos   /* Sun/Oracle C */
129*d881c474Schristos   #define ND_SUNPRO_VERSION_TO_BCD(major, minor) \
130*d881c474Schristos 	(((minor) >= 10) ? \
131*d881c474Schristos 	    (((major) << 12) | (((minor)/10) << 8) | (((minor)%10) << 4)) : \
132*d881c474Schristos 	    (((major) << 8) | ((minor) << 4)))
133*d881c474Schristos   #define ND_IS_AT_LEAST_SUNC_VERSION(major,minor) \
134*d881c474Schristos 	(__SUNPRO_C >= ND_SUNPRO_VERSION_TO_BCD((major), (minor)))
135*d881c474Schristos #endif
136*d881c474Schristos 
137*d881c474Schristos /*
138*d881c474Schristos  * Check whether this is IBM XL C major.minor or a later release.
139*d881c474Schristos  *
140*d881c474Schristos  * The version number in __xlC__ has the major version in the
141*d881c474Schristos  * upper 8 bits and the minor version in the lower 8 bits.
142*d881c474Schristos  * On AIX __xlC__ is always defined, __ibmxl__ becomes defined in XL C 16.1.
143*d881c474Schristos  * On Linux since XL C 13.1.6 __xlC__ is not defined by default anymore, but
144*d881c474Schristos  * __ibmxl__ is defined since at least XL C 13.1.1.
145*d881c474Schristos  */
146*d881c474Schristos 
147*d881c474Schristos #if ! defined(__xlC__) && ! defined(__ibmxl__)
148*d881c474Schristos   /* Not XL C */
149*d881c474Schristos   #define ND_IS_AT_LEAST_XL_C_VERSION(major,minor) 0
150*d881c474Schristos   #define ND_IS_AT_LEAST_XL_C_MODFIX(modification, fixlevel) 0
151*d881c474Schristos #else
152*d881c474Schristos   /* XL C */
153*d881c474Schristos   #if defined(__ibmxl__)
154*d881c474Schristos     /*
155*d881c474Schristos      * Later Linux version of XL C; use __ibmxl_version__ to test
156*d881c474Schristos      * the version.
157*d881c474Schristos      */
158*d881c474Schristos     #define ND_IS_AT_LEAST_XL_C_VERSION(major, minor) \
159*d881c474Schristos 	(__ibmxl_version__ > (major) || \
160*d881c474Schristos 	 (__ibmxl_version__ == (major) && __ibmxl_release__ >= (minor)))
161*d881c474Schristos     #define ND_IS_AT_LEAST_XL_C_MODFIX(modification, fixlevel) \
162*d881c474Schristos 	(__ibmxl_modification__ > (modification) || \
163*d881c474Schristos 	 (__ibmxl_modification__ == (modification) && \
164*d881c474Schristos 	  __ibmxl_ptf_fix_level__ >= (fixlevel)))
165*d881c474Schristos   #else /* __ibmxl__ */
166*d881c474Schristos     /*
167*d881c474Schristos      * __ibmxl__ not defined; use __xlC__ to test the version.
168*d881c474Schristos      */
169*d881c474Schristos     #define ND_IS_AT_LEAST_XL_C_VERSION(major, minor) \
170*d881c474Schristos 	(__xlC__ >= (((major) << 8) | (minor)))
171*d881c474Schristos     #define ND_IS_AT_LEAST_XL_C_MODFIX(modification, fixlevel) \
172*d881c474Schristos 	((((modification) << 8) | (fixlevel)) >= __xlC_ver__)
173*d881c474Schristos   #endif /* __ibmxl__ */
174*d881c474Schristos #endif
175*d881c474Schristos 
176*d881c474Schristos /*
177*d881c474Schristos  * Check whether this is HP aC++/HP C major.minor or a later release.
178*d881c474Schristos  *
179*d881c474Schristos  * The version number in __HP_aCC is encoded in zero-padded decimal BCD,
180*d881c474Schristos  * with the "A." stripped off, the uppermost two decimal digits being
181*d881c474Schristos  * the major version number, the next two decimal digits being the minor
182*d881c474Schristos  * version number, and the last two decimal digits being the patch version.
183*d881c474Schristos  * (Strip off the A., remove the . between the major and minor version
184*d881c474Schristos  * number, and add two digits of patch.)
185*d881c474Schristos  */
186*d881c474Schristos 
187*d881c474Schristos #if ! defined(__HP_aCC)
188*d881c474Schristos   /* Not HP C */
189*d881c474Schristos   #define ND_IS_AT_LEAST_HP_C_VERSION(major,minor) 0
190*d881c474Schristos #else
191*d881c474Schristos   /* HP C */
192*d881c474Schristos   #define ND_IS_AT_LEAST_HP_C_VERSION(major,minor) \
193*d881c474Schristos 	(__HP_aCC >= ((major)*10000 + (minor)*100))
194*d881c474Schristos #endif
195*d881c474Schristos 
196*d881c474Schristos #endif /* nd_funcattrs_h */
197