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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 87a0c5a58511..86ea82eda4b5 100644
--- a/clang/lib/Driver/Distro.cpp
+++ b/clang/lib/Driver/Distro.cpp
@@ -98,6 +98,10 @@ 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 aa125bb308e8..8b86e144054c 100644
--- a/clang/lib/Driver/ToolChains/Cuda.cpp
+++ b/clang/lib/Driver/ToolChains/Cuda.cpp
@@ -124,6 +124,9 @@ 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 c6fb290ffdb4..4736f4bb3392 100644
--- a/clang/lib/Driver/ToolChains/Linux.cpp
+++ b/clang/lib/Driver/ToolChains/Linux.cpp
@@ -189,6 +189,10 @@ 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()) {
@@ -249,6 +253,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
#ifdef ENABLE_LINKER_BUILD_ID
ExtraOpts.push_back("--build-id");
+#endif
#endif
// The selection of paths to try here is designed to match the patterns which
@@ -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, concat(SysRoot, "/lib", MultiarchTriple), Paths);
addPathIfExists(D, concat(SysRoot, "/lib/..", OSLibDir), Paths);
@@ -298,9 +304,11 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
addPathIfExists(D, concat(SysRoot, "/", OSLibDir, ABIName), Paths);
addPathIfExists(D, concat(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, concat(SysRoot, "/lib"), Paths);
addPathIfExists(D, concat(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 {
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