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The return value of sys::getDefaultTargetTriple, which is derived from -DLLVM_DEFAULT_TRIPLE, is used to construct tool names, default target, and in the future also to control the search path directly; as such it should be used textually, without interpretation by LLVM. Normalization of this value may lead to unexpected results, for example if we configure LLVM with -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-linux-gnu, normalization will transform that value to x86_64--linux-gnu. Driver will use that value to search for tools prefixed with x86_64--linux-gnu- which may be confusing. This is also inconsistent with the behavior of the --target flag which is taken as-is without any normalization and overrides the value of LLVM_DEFAULT_TARGET_TRIPLE. Users of sys::getDefaultTargetTriple already perform their own normalization as needed, so this change shouldn't impact existing logic. Differential Revision: https://reviews.llvm.org/D47153 llvm-svn: 333307
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
//===- llvm/Support/Unix/Host.inc -------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the UNIX Host support.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Config/config.h"
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#include <cctype>
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#include <string>
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#include <sys/utsname.h>
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using namespace llvm;
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static std::string getOSVersion() {
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struct utsname info;
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if (uname(&info))
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return "";
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return info.release;
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}
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static std::string updateTripleOSVersion(std::string TargetTripleString) {
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// On darwin, we want to update the version to match that of the target.
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std::string::size_type DarwinDashIdx = TargetTripleString.find("-darwin");
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if (DarwinDashIdx != std::string::npos) {
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TargetTripleString.resize(DarwinDashIdx + strlen("-darwin"));
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TargetTripleString += getOSVersion();
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return TargetTripleString;
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}
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std::string::size_type MacOSDashIdx = TargetTripleString.find("-macos");
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if (MacOSDashIdx != std::string::npos) {
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TargetTripleString.resize(MacOSDashIdx);
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// Reset the OS to darwin as the OS version from `uname` doesn't use the
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// macOS version scheme.
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TargetTripleString += "-darwin";
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TargetTripleString += getOSVersion();
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}
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return TargetTripleString;
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}
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std::string sys::getDefaultTargetTriple() {
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std::string TargetTripleString =
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updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
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// Override the default target with an environment variable named by
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// LLVM_TARGET_TRIPLE_ENV.
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#if defined(LLVM_TARGET_TRIPLE_ENV)
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if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
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TargetTripleString = EnvTriple;
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#endif
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return TargetTripleString;
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}
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