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// file : butl/triplet -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_TRIPLET
#define BUTL_TRIPLET
#include <string>
namespace butl
{
// This is the ubiquitous 'target triplet' that loosely has the CPU-VENDOR-OS
// form which, these days, quite often takes the CPU-VENDOR-OS-ABI form. Plus
// some fields can sometimes be omitted. This looseness makes it hard to base
// any kind of decisions on the triplet without canonicalizing it and then
// splitting it into components. the way we are going to split it is like
// this:
//
// CPU
//
// This one is reasonably straightforward. Note that we always expect at
// least two components with the first being the CPU. In other words, we
// don't try to guess what just 'mingw32' might mean like config.sub does.
//
// VENDOR
//
// This can be a machine vendor as in i686-apple-darwin8, a toolchain vendor
// as in i686-lfs-linux-gnu, or something else as in arm-softfloat-linux-gnu.
// Just as we think vendor is pretty irrelevant and can be ignored, comes
// MinGW-W64 and calls itself *-w64-mingw32. While it is tempting to
// attribute w64 to OS-ABI, the MinGW-W64 folks insist it is a (presumably
// toolchain) vendor.
//
// To make thing more regular we also convert the information-free vendor
// names 'pc', 'unknown' and 'none' to the empty name.
//
// OS/KERNEL-OS/OS-ABI
//
// This is where things get really messy and instead of trying to guess, we
// call the entire thing SYSTEM. Except, in certain cases, we factor out the
// trailing version, again, to make SYSTEM easier to compare to. For example,
// *-darwin14.5.0 becomes 'darwin' and '14.5.0'.
//
// Again, to make things more regular, if the first component in SYSTEM is
// none, then it is removed (so *-none-eabi becomes just 'eabi').
//
// Values for two-component systems (e.g., linux-gnu) that don't specify
// VENDOR explicitly are inherently ambiguous: is 'linux' VENDOR or part of
// SYSTEM? The only way to handle this is to recognize their specific names
// as special cases and this is what we do for some of the more common
// ones. The alternative would be to first run such names through config.sub
// which adds explicit VENDOR and this could be a reasonable fallback
// strategy for (presumably less common) cases were we don't split things
// correctly.
//
// Note also that the version splitting is only done for certain,
// commonly-used targets.
//
// Some examples of canonicalization and splitting:
//
// x86_64-apple-darwin14.5.0 x86_64 apple darwin 14.5.0
// x86_64-unknown-freebsd10.2 x86_64 freebsd 10.2
// i686-elf i686 elf
// arm-eabi arm eabi
// arm-none-eabi arm eabi
// arm-none-linux-gnueabi arm linux-gnueabi
// arm-softfloat-linux-gnu arm softfloat linux-gnu
// i686-pc-mingw32 i686 mingw32
// i686-w64-mingw32 i686 w64 mingw32
// i686-lfs-linux-gnu i686 lfs linux-gnu
// x86_64-unknown-linux-gnu x86_64 linux-gnu
// x86_64-linux-gnux32 x86_64 linux-gnux32
//
// References:
//
// 1. The libtool repository contains the PLATFORM file that lists many known
// triplets.
//
// 2. LLVM has the Triple class with similar goals.
//
struct triplet
{
std::string cpu;
std::string vendor;
std::string system;
std::string version;
// Parse the triplet optionally returning the canonicalized string. Throw
// std::invalid_argument if the triplet is not recognizable.
//
explicit
triplet (const std::string&, std::string* canon = nullptr);
triplet (const std::string& s, std::string& canon): triplet (s, &canon) {}
};
};
#endif // BUTL_TRIPLET
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