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-rw-r--r--gnu/packages/patches/clang-15.0-libc-search-path.patch95
1 files changed, 95 insertions, 0 deletions
diff --git a/gnu/packages/patches/clang-15.0-libc-search-path.patch b/gnu/packages/patches/clang-15.0-libc-search-path.patch
new file mode 100644
index 0000000000..20726859b2
--- /dev/null
+++ b/gnu/packages/patches/clang-15.0-libc-search-path.patch
@@ -0,0 +1,95 @@
+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/libDriver/Distro.cpp
+index 1898667..35de813 100644
+--- a/clang/lib/Driver/Distro.cpp
++++ b/clang/libDriver/Distro.cpp
+@@ -97,6 +97,10 @@ 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/libDriver/ToolChains/Cuda.cpp
+index 7ad990d..e4da4d4 100644
+--- a/clang/lib/Driver/ToolChains/Cuda.cpp
++++ b/clang/libDriver/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/libDriver/ToolChains/Linux.cpp
+index ceb1a98..9d7a14a 100644
+--- a/clang/lib/Driver/ToolChains/Linux.cpp
++++ b/clang/libDriver/ToolChains/Linux.cpp
+@@ -188,6 +188,10 @@ 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()) {
+@@ -256,6 +260,7 @@ 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.
+@@ -276,6 +281,7 @@ 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);
+
+@@ -304,9 +310,11 @@ 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.
+@@ -316,6 +324,14 @@ 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 {