0cbf003c78
Clang detects the GCC version from the libdir. However, modern GCC versions only include the major version in the libdir (something like lib/gcc/powerpc64le-linux-gnu/12/), not all version components. For this reason, even though the system has a supported libstdcxx, it will still fail the check against the 12.1.0 version requirement. Fix this by doing the same thing we do for patch versions: Assume that a missing minor version is larger than any specific version. To allow this to be tested, we need to fix two additional issues: First, the GCC toolchain directories used for testing need to contain a crtbegin.o file to be properly detected. The existing tests actually ended up using a 0.0.0 version, rather the intended one. Second, we also need to satisfy the glibc version check based on the dynamic linker. To do so, respect the --dyld-prefix argument and add the necessary file to the test toolchain directory. Differential Revision: https://reviews.llvm.org/D136258
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
//===-- PPCLinux.cpp - PowerPC ToolChain Implementations --------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PPCLinux.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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using namespace clang::driver;
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using namespace clang::driver::toolchains;
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using namespace llvm::opt;
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using namespace llvm::sys;
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// Glibc older than 2.32 doesn't fully support IEEE float128. Here we check
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// glibc version by looking at dynamic linker name.
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static bool GlibcSupportsFloat128(const std::string &Linker) {
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llvm::SmallVector<char, 16> Path;
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// Resolve potential symlinks to linker.
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if (fs::real_path(Linker, Path))
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return false;
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llvm::StringRef LinkerName =
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path::filename(llvm::StringRef(Path.data(), Path.size()));
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// Since glibc 2.34, the installed .so file is not symlink anymore. But we can
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// still safely assume it's newer than 2.32.
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if (LinkerName.startswith("ld64.so"))
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return true;
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if (!LinkerName.startswith("ld-2."))
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return false;
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unsigned Minor = (LinkerName[5] - '0') * 10 + (LinkerName[6] - '0');
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if (Minor < 32)
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return false;
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return true;
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}
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PPCLinuxToolChain::PPCLinuxToolChain(const Driver &D,
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const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args)
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: Linux(D, Triple, Args) {
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if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
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StringRef ABIName = A->getValue();
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if (ABIName == "ieeelongdouble" && !SupportIEEEFloat128(D, Triple, Args))
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D.Diag(diag::warn_drv_unsupported_float_abi_by_lib) << ABIName;
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}
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}
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void PPCLinuxToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
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ArgStringList &CC1Args) const {
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if (!DriverArgs.hasArg(clang::driver::options::OPT_nostdinc) &&
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!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
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const Driver &D = getDriver();
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SmallString<128> P(D.ResourceDir);
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llvm::sys::path::append(P, "include", "ppc_wrappers");
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addSystemInclude(DriverArgs, CC1Args, P);
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}
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Linux::AddClangSystemIncludeArgs(DriverArgs, CC1Args);
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}
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bool PPCLinuxToolChain::SupportIEEEFloat128(
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const Driver &D, const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args) const {
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if (!Triple.isLittleEndian() || !Triple.isPPC64())
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return false;
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if (Args.hasArg(options::OPT_nostdlib, options::OPT_nostdlibxx))
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return true;
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CXXStdlibType StdLib = ToolChain::GetCXXStdlibType(Args);
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bool HasUnsupportedCXXLib =
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StdLib == CST_Libcxx ||
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(StdLib == CST_Libstdcxx &&
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GCCInstallation.getVersion().isOlderThan(12, 1, 0));
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std::string Linker = Linux::getDynamicLinker(Args);
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return GlibcSupportsFloat128((Twine(D.DyldPrefix) + Linker).str()) &&
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!(D.CCCIsCXX() && HasUnsupportedCXXLib);
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}
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