janwas
4083e1ff48
config, compiler: remove reliance on HAVE_C99; mention it's only for pure C mode; make a few of the HAVE_ macro defs more clear This was SVN commit r5076.
110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/**
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* =========================================================================
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* File : compiler.h
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* Project : 0 A.D.
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* Description : compiler-specific macros and fixes
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_COMPILER
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#define INCLUDED_COMPILER
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// pass "omit frame pointer" setting on to the compiler
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#if MSC_VERSION
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# if CONFIG_OMIT_FP
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# pragma optimize("y", on)
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# else
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# pragma optimize("y", off)
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# endif
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#elif GCC_VERSION
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// TODO
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#endif
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// try to define _W64, if not already done
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// (this is useful for catching pointer size bugs)
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#ifndef _W64
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# if MSC_VERSION
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# define _W64 __w64
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# elif GCC_VERSION
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# define _W64 __attribute__((mode (__pointer__)))
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# else
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# define _W64
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# endif
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#endif
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// C99-like restrict (non-standard in C++, but widely supported in various forms).
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//
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// May be used on pointers. May also be used on member functions to indicate
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// that 'this' is unaliased (e.g. "void C::m() RESTRICT { ... }").
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// Must not be used on references - GCC supports that but VC doesn't.
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//
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// We call this "RESTRICT" to avoid conflicts with VC's __declspec(restrict),
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// and because it's not really the same as C99's restrict.
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//
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// To be safe and satisfy the compilers' stated requirements: an object accessed
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// by a restricted pointer must not be accessed by any other pointer within the
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// lifetime of the restricted pointer, if the object is modified.
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// To maximise the chance of optimisation, any pointers that could potentially
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// alias with the restricted one should be marked as restricted too.
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//
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// It would probably be a good idea to write test cases for any code that uses
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// this in an even very slightly unclear way, in case it causes obscure problems
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// in a rare compiler due to differing semantics.
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//
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// .. GCC
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#if GCC_VERSION
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# define RESTRICT __restrict__
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// .. VC8 provides __restrict
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#elif MSC_VERSION >= 1400
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# define RESTRICT __restrict
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// .. ICC supports the keyword 'restrict' when run with the /Qrestrict option,
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// but it always also supports __restrict__ or __restrict to be compatible
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// with GCC/MSVC, so we'll use the underscored version. One of {GCC,MSC}_VERSION
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// should have been defined in addition to ICC_VERSION, so we should be using
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// one of the above cases (unless it's an old VS7.1-emulating ICC).
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#elif ICC_VERSION
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# error ICC_VERSION defined without either GCC_VERSION or an adequate MSC_VERSION
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// .. unsupported; remove it from code
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#else
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# define RESTRICT
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#endif
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// C99-style __func__
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// .. newer GCC already have it
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#if GCC_VERSION >= 300
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// nothing need be done
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// .. old GCC and MSVC have __FUNCTION__
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#elif GCC_VERSION >= 200 || MSC_VERSION
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# define __func__ __FUNCTION__
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// .. unsupported
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#else
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# define __func__ "(unknown)"
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#endif
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// tell the compiler that the code at/following this macro invocation is
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// unreachable. this can improve optimization and avoid warnings.
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//
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// this macro should not generate any fallback code; it is merely the
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// compiler-specific backend for lib.h's UNREACHABLE.
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// #define it to nothing if the compiler doesn't support such a hint.
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#if MSC_VERSION
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# define ASSUME_UNREACHABLE __assume(0)
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#else
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# define ASSUME_UNREACHABLE
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#endif
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// extern "C", but does the right thing in pure-C mode
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#if defined(__cplusplus)
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# define EXTERN_C extern "C"
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#else
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# define EXTERN_C extern
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#endif
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#endif // #ifndef INCLUDED_COMPILER
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