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compiler.h
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1 /* Copyright (c) 2022 Wildfire Games.
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22 
23 /*
24  * compiler-specific macros and fixes
25  */
26 
27 #ifndef INCLUDED_COMPILER
28 #define INCLUDED_COMPILER
29 
30 // detect compiler and its version (0 if not present, otherwise
31 // major*100 + minor). note that more than one *_VERSION may be
32 // non-zero due to interoperability (e.g. ICC with MSC).
33 // .. VC
34 #ifdef _MSC_VER
35 # define MSC_VERSION _MSC_VER
36 #else
37 # define MSC_VERSION 0
38 #endif
39 // .. ICC (VC-compatible, GCC-compatible)
40 #if defined(__INTEL_COMPILER)
41 # define ICC_VERSION __INTEL_COMPILER
42 #else
43 # define ICC_VERSION 0
44 #endif
45 // .. LCC (Win32) and MCST LCC (E2K) compilers define same identifier (__LCC__)
46 #if defined(__LCC__) && !defined(__MCST__)
47 # define LCC_VERSION __LCC__
48 #else
49 # define LCC_VERSION 0
50 #endif
51 // .. MCST LCC (eLbrus Compiler Collection)
52 #if defined(__LCC__) && defined(__MCST__)
53 # define MCST_LCC_VERSION (__LCC__*100 + __LCC_MINOR__)
54 #else
55 # define MCST_LCC_VERSION 0
56 #endif
57 // .. GCC
58 #ifdef __GNUC__
59 # define GCC_VERSION (__GNUC__*100 + __GNUC_MINOR__)
60 #else
61 # define GCC_VERSION 0
62 #endif
63 // .. Clang/LLVM (GCC-compatible)
64 // use Clang's feature checking macros to check for availability of features
65 // http://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros
66 #ifdef __clang__
67 # define CLANG_VERSION (__clang_major__*100 + __clang_minor__)
68 #else
69 # define CLANG_VERSION 0
70 #endif
71 
72 // Clang/LLVM feature check macro compatibility
73 #ifndef __has_feature
74 # define __has_feature(x) 0
75 #endif
76 
77 #ifndef __has_cpp_attribute
78 # define __has_cpp_attribute(x) 0
79 #endif
80 
81 // check if compiling in pure C mode (not C++) with support for C99.
82 // (this is more convenient than testing __STDC_VERSION__ directly)
83 //
84 // note: C99 provides several useful but disjunct bits of functionality.
85 // unfortunately, most C++ compilers do not offer a complete implementation.
86 // however, many of these features are likely to be added to C++, and/or are
87 // already available as extensions. what we'll do is add a HAVE_ macro for
88 // each feature and test those instead. they are set if HAVE_C99, or also if
89 // the compiler happens to support something compatible.
90 //
91 // rationale: lying about __STDC_VERSION__ via Premake so as to enable support
92 // for some C99 functions doesn't work. Mac OS X headers would then use the
93 // restrict keyword, which is never supported by g++ (because that might
94 // end up breaking valid C++98 programs).
95 #define HAVE_C99 0
96 #ifdef __STDC_VERSION__
97 # if __STDC_VERSION__ >= 199901L
98 # undef HAVE_C99
99 # define HAVE_C99 1
100 # endif
101 #endif
102 
103 // Streaming SIMD Extensions (not supported by all GCC)
104 // this only ascertains compiler support; use x86_x64::Cap to
105 // check whether the instructions are supported by the CPU.
106 #ifndef COMPILER_HAS_SSE
107 # if GCC_VERSION && defined(__SSE__)
108 # define COMPILER_HAS_SSE 1
109 # elif MSC_VERSION // also includes ICC
110 # define COMPILER_HAS_SSE 1
111 # else
112 # define COMPILER_HAS_SSE 0
113 # endif
114 #endif
115 
116 #ifndef COMPILER_HAS_SSE2
117 # if GCC_VERSION && defined(__SSE2__)
118 # define COMPILER_HAS_SSE2 1
119 # elif MSC_VERSION // also includes ICC
120 # define COMPILER_HAS_SSE2 1
121 # else
122 # define COMPILER_HAS_SSE2 0
123 # endif
124 #endif
125 
126 #endif // #ifndef INCLUDED_COMPILER
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