Clang attempts to guess file names based on the OS and distro (yes!), but unfortunately, that doesn't work for us. This patch makes it easy to insert libc's $libdir so that Clang passes the correct absolute file name of crt1.o etc. to 'ld'. It also disables all the distro-specific stuff and removes the hard-coded FHS directory names to make sure Clang also works on foreign distros. diff --git a/clang/lib/Driver/Distro.cpp b/clang/lib/Driver/Distro.cpp index 5ac38c34d112..2a704b418fdc 100644 --- a/clang/lib/Driver/Distro.cpp +++ b/clang/lib/Driver/Distro.cpp @@ -96,6 +96,10 @@ static Distro::DistroType DetectLsbRelease(llvm::vfs::FileSystem &VFS) { } static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS) { + // The compiler should always behave the same, even when used via Guix on a + // foreign distro. + return Distro::UnknownDistro; + Distro::DistroType Version = Distro::UnknownDistro; // Newer freedesktop.org's compilant systemd-based systems diff --git a/clang/lib/Driver/ToolChains/Cuda.cpp b/clang/lib/Driver/ToolChains/Cuda.cpp index 4a9f6d4c4e3e..0ae13ebebd27 100644 --- a/clang/lib/Driver/ToolChains/Cuda.cpp +++ b/clang/lib/Driver/ToolChains/Cuda.cpp @@ -117,6 +117,9 @@ CudaInstallationDetector::CudaInstallationDetector( const Driver &D, const llvm::Triple &HostTriple, const llvm::opt::ArgList &Args) : D(D) { + // Don't look for CUDA in /usr. + return; + struct Candidate { std::string Path; bool StrictChecking; diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp index 83cb41159de7..6b920e33d1ef 100644 --- a/clang/lib/Driver/ToolChains/Linux.cpp +++ b/clang/lib/Driver/ToolChains/Linux.cpp @@ -186,6 +186,10 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) Generic_GCC::PushPPaths(PPaths); + // Comment out the distro-specific tweaks so that they don't bite when + // using Guix on a foreign distro. +#if 0 + Distro Distro(D.getVFS(), Triple); if (Distro.IsAlpineLinux() || Triple.isAndroid()) { @@ -250,6 +254,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) if (IsAndroid || Distro.IsOpenSUSE()) ExtraOpts.push_back("--enable-new-dtags"); +#endif // The selection of paths to try here is designed to match the patterns which // the GCC driver itself uses, as this is part of the GCC-compatible driver. @@ -270,6 +275,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) } Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); +#if 0 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths); @@ -298,9 +304,11 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths); addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths); } +#endif Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); +#if 0 // The deprecated -DLLVM_ENABLE_PROJECTS=libcxx configuration installs // libc++.so in D.Dir+"/../lib/". Detect this path. // TODO Remove once LLVM_ENABLE_PROJECTS=libcxx is unsupported. @@ -310,6 +318,14 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) addPathIfExists(D, SysRoot + "/lib", Paths); addPathIfExists(D, SysRoot + "/usr/lib", Paths); +#endif + + // Add libc's lib/ directory to the search path, so that crt1.o, crti.o, + // and friends can be found. + addPathIfExists(D, "@GLIBC_LIBDIR@", Paths); + + // Add GCC's lib/ directory so libstdc++.so can be found. + addPathIfExists(D, GCCInstallation.getParentLibPath(), Paths); } ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { span title='2023-09-05 19:50:43 -0400'>2023-09-05