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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/lib/Driver/Distro.cpp b/lib/Driver/Distro.cpp
index 4d58ad1a..6f638eca 100644
--- a/lib/Driver/Distro.cpp
+++ b/lib/Driver/Distro.cpp
@@ -21,6 +21,10 @@ using namespace clang;
static Distro::DistroType DetectDistro(llvm::vfs::FileSystem &VFS,
const llvm::Triple &TargetOrHost) {
+ // The compiler should always behave the same, even when used via Guix on a
+ // foreign distro.
+ return Distro::UnknownDistro;
+
// If we don't target Linux, no need to check the distro. This saves a few
// OS calls.
if (!TargetOrHost.isOSLinux())
diff --git a/lib/Driver/ToolChains/Cuda.cpp b/lib/Driver/ToolChains/Cuda.cpp
index 110a0bca..42b9f7b7 100644
--- a/lib/Driver/ToolChains/Cuda.cpp
+++ b/lib/Driver/ToolChains/Cuda.cpp
@@ -67,6 +67,9 @@ 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/lib/Driver/ToolChains/Linux.cpp b/lib/Driver/ToolChains/Linux.cpp
index 18035047..ace8f443 100644
--- a/lib/Driver/ToolChains/Linux.cpp
+++ b/lib/Driver/ToolChains/Linux.cpp
@@ -219,6 +219,9 @@ 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()) {
@@ -284,6 +287,7 @@ 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.
@@ -297,6 +301,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths);
+#if 0
// Similar to the logic for GCC above, if we currently running Clang inside
// of the requested system root, add its parent library paths to
// those searched.
@@ -348,9 +353,14 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
// directory ('Dir' below) or the ResourceDir.
if (StringRef(D.Dir).startswith(SysRoot))
addPathIfExists(D, D.Dir + "/../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);
- addPathIfExists(D, SysRoot + "/lib", Paths);
- addPathIfExists(D, SysRoot + "/usr/lib", Paths);
+ // Add GCC's lib/ directory so libstdc++.so can be found.
+ addPathIfExists(D, GCCInstallation.getParentLibPath(), Paths);
}
ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const {
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