================
@@ -110,56 +144,99 @@ static std::string computeBaseSysRoot(const Driver &D,
bool IncludeTriple) {
return std::string(SysRootDir);
}
-BareMetal::BareMetal(const Driver &D, const llvm::Triple &Triple,
- const ArgList &Args)
- : ToolChain(D, Triple, Args),
- SysRoot(computeBaseSysRoot(D, /*IncludeTriple=*/true)) {
- getProgramPaths().push_back(getDriver().Dir);
-
- findMultilibs(D, Triple, Args);
- SmallString<128> SysRoot(computeSysRoot());
- if (!SysRoot.empty()) {
- for (const Multilib &M : getOrderedMultilibs()) {
- SmallString<128> Dir(SysRoot);
- llvm::sys::path::append(Dir, M.osSuffix(), "lib");
- getFilePaths().push_back(std::string(Dir));
- getLibraryPaths().push_back(std::string(Dir));
- }
- }
+static bool hasGCCToolChainAlongSideClang(const Driver &D) {
+ SmallString<128> GCCDir;
+ llvm::sys::path::append(GCCDir, D.Dir, "..", D.getTargetTriple(),
+ "lib/crt0.o");
+ return llvm::sys::fs::exists(GCCDir);
}
-/// Is the triple {aarch64.aarch64_be}-none-elf?
-static bool isAArch64BareMetal(const llvm::Triple &Triple) {
- if (Triple.getArch() != llvm::Triple::aarch64 &&
- Triple.getArch() != llvm::Triple::aarch64_be)
- return false;
+// Users can specify their GCC toolchain using `-gcc-install-dir` or
+// `--gcc-toolchain`. If no sysroot is explicitly provided, the driver will
+// attempt to infer it from the values of the above flags.
+//
+// If neither flag is used, the sysroot defaults to either:
+// - `bin/../<target-triple>`
+// - `bin/../lib/clang-runtimes/<target-triple>`
+//
+// To use the `clang-runtimes` path, ensure that
`../<target-triple>/lib/crt0.o`
+// does not exist relative to the driver.
+std::string BareMetal::computeSysRoot() const {
+ if (!SysRoot.empty())
+ return SysRoot;
- if (Triple.getVendor() != llvm::Triple::UnknownVendor)
- return false;
+ const Driver &D = getDriver();
+ if (!D.SysRoot.empty())
+ return D.SysRoot;
- if (Triple.getOS() != llvm::Triple::UnknownOS)
- return false;
+ // Verify the GCC installation from -gcc-install-dir, --gcc-toolchain, or
+ // alongside clang. If valid, form the sysroot. Otherwise, check
+ // lib/clang-runtimes above the driver.
+ SmallString<128> SysRootDir;
+ if (GCCInstallation.isValid()) {
+ StringRef LibDir = GCCInstallation.getParentLibPath();
+ StringRef TripleStr = GCCInstallation.getTriple().str();
+ llvm::sys::path::append(SysRootDir, LibDir, "..", TripleStr);
+ } else if (hasGCCToolChainAlongSideClang(D)) {
+ // Use the triple as provided to the driver. Unlike the parsed triple
+ // this has not been normalized to always contain every field.
+ llvm::sys::path::append(SysRootDir, D.Dir, "..", D.getTargetTriple());
+ }
- return Triple.getEnvironmentName() == "elf";
+ if (llvm::sys::fs::exists(SysRootDir))
+ return std::string(SysRootDir);
+ return computeBaseSysRoot(D, /*IncludeTriple*/ true);
}
-static bool isRISCVBareMetal(const llvm::Triple &Triple) {
- if (!Triple.isRISCV())
- return false;
-
- if (Triple.getVendor() != llvm::Triple::UnknownVendor)
- return false;
-
- if (Triple.getOS() != llvm::Triple::UnknownOS)
- return false;
-
- return Triple.getEnvironmentName() == "elf";
+static void addMultilibsFilePaths(const Driver &D, const MultilibSet
&Multilibs,
+ const Multilib &Multilib,
+ StringRef InstallPath,
+ ToolChain::path_list &Paths) {
+ if (const auto &PathsCallback = Multilibs.filePathsCallback())
+ for (const auto &Path : PathsCallback(Multilib))
+ addPathIfExists(D, InstallPath + Path, Paths);
}
-/// Is the triple powerpc[64][le]-*-none-eabi?
-static bool isPPCBareMetal(const llvm::Triple &Triple) {
- return Triple.isPPC() && Triple.getOS() == llvm::Triple::UnknownOS &&
- Triple.getEnvironment() == llvm::Triple::EABI;
+// GCC mutltilibs will only work for those targets that have their multlib
+// structure encoded into GCCInstallation. Baremetal toolchain support ARM,
+// AArch64, RISCV and PPC and of them only RISCV have GCC multilibs hardcoded
+// in GCCInstallation.
+BareMetal::BareMetal(const Driver &D, const llvm::Triple &Triple,
+ const ArgList &Args)
+ : Generic_ELF(D, Triple, Args) {
+ GCCInstallation.init(Triple, Args);
+ SysRoot = computeSysRoot();
+ if (GCCInstallation.isValid()) {
+ if (!isRISCVBareMetal(Triple))
+ D.Diag(clang::diag::warn_drv_multilib_not_available_for_target);
+ Multilibs = GCCInstallation.getMultilibs();
+ SelectedMultilibs.assign({GCCInstallation.getMultilib()});
+ path_list &Paths = getFilePaths();
+ // Add toolchain/multilib specific file paths.
+ addMultilibsFilePaths(D, Multilibs, SelectedMultilibs.back(),
+ GCCInstallation.getInstallPath(), Paths);
+ getFilePaths().push_back(GCCInstallation.getInstallPath().str());
+ ToolChain::path_list &PPaths = getProgramPaths();
+ // Multilib cross-compiler GCC installations put ld in a triple-prefixed
+ // directory off of the parent of the GCC installation.
+ PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
+ GCCInstallation.getTriple().str() + "/bin")
+ .str());
+ PPaths.push_back((GCCInstallation.getParentLibPath() + "/../bin").str());
+ getFilePaths().push_back(SysRoot + "/lib");
+ } else {
+ getProgramPaths().push_back(getDriver().Dir);
+ findMultilibs(D, Triple, Args);
+ const SmallString<128> SysRootDir(computeSysRoot());
----------------
smithp35 wrote:
Assuming it is still the ToolChain::SysRoot that is set on line 208 can you
still use it rather than recompute. All computeSysRoot will do is return
ToolChain::SysRoot as it has been set either on line 208 or by findMultilibs?
https://github.com/llvm/llvm-project/pull/121829
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