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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 non-GuixSD systems.
--- a/lib/Driver/ToolChains/Linux.cpp
+++ b/lib/Driver/ToolChains/Linux.cpp
@@ -225,7 +225,9 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
GCCInstallation.getTriple().str() + "/bin")
.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());
if (Distro.IsAlpineLinux()) {
@@ -284,6 +286,7 @@ 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.
@@ -342,7 +345,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
// the cross. Note that GCC does include some of these directories in some
// configurations but this seems somewhere between questionable and simply
// a bug.
- if (StringRef(LibPath).startswith(SysRoot)) {
+ if (0) {
addPathIfExists(D, LibPath + "/" + MultiarchTriple, Paths);
addPathIfExists(D, LibPath + "/../" + OSLibDir, Paths);
}
@@ -361,6 +364,8 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
+ // This requires the commented distro tweaks above.
+#if 0
if (IsAndroid) {
// Android sysroots contain a library directory for each supported OS
// version as well as some unversioned libraries in the usual multiarch
@@ -389,10 +394,14 @@ 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
// 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.
+#if 0
addPathIfExists(D,
SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
"/../../" + OSLibDir,
@@ -405,6 +414,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
BiarchSibling.gccSuffix(),
Paths);
}
+#endif
// See comments above on the multilib variant for details of why this is
// included even from outside the sysroot.
@@ -429,8 +439,9 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
if (StringRef(D.Dir).startswith(SysRoot))
addPathIfExists(D, D.Dir + "/../lib", Paths);
- addPathIfExists(D, SysRoot + "/lib", Paths);
- addPathIfExists(D, SysRoot + "/usr/lib", Paths);
+ // 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);
}
bool Linux::HasNativeLLVMSupport() const { return true; }
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