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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 06707fef..f3bd43de 100644
--- a/lib/Driver/Distro.cpp
+++ b/lib/Driver/Distro.cpp
@@ -20,6 +20,10 @@ 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 50d22a2a..4ab93e0a 100644
--- a/lib/Driver/ToolChains/Cuda.cpp
+++ b/lib/Driver/ToolChains/Cuda.cpp
@@ -60,6 +60,9 @@ 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 bff1ab10..e996d3b8 100644
--- a/lib/Driver/ToolChains/Linux.cpp
+++ b/lib/Driver/ToolChains/Linux.cpp
@@ -240,6 +240,9 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
.str());
}
+ // 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()) {
@@ -306,6 +309,7 @@ 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.
@@ -369,6 +373,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
}
}
+#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.
@@ -414,6 +419,8 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
// Try walking via the GCC triple path in case of biarch or multiarch GCC
// installations with strange symlinks.
if (GCCInstallation.isValid()) {
+ // The following code would end up adding things like
+ // "/usr/lib/x86_64-unknown-linux-gnu/../../lib64" to the search path.
addPathIfExists(D,
SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
"/../../" + OSLibDir,
@@ -449,9 +456,14 @@ 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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