benshi001 created this revision.
benshi001 added reviewers: aykevl, dylanmckay.
Herald added subscribers: Jim, dberris.
Herald added a project: All.
benshi001 requested review of this revision.
Herald added subscribers: cfe-commits, jacquesguan, MaskRay.
Herald added a project: clang.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D127186
Files:
clang/lib/Driver/ToolChains/AVR.cpp
clang/lib/Driver/ToolChains/AVR.h
clang/test/Driver/Inputs/resource_dir_with_per_target_subdir/lib/avr5/libclang_rt.builtins-avr.a
clang/test/Driver/avr-toolchain.c
Index: clang/test/Driver/avr-toolchain.c
===================================================================
--- clang/test/Driver/avr-toolchain.c
+++ clang/test/Driver/avr-toolchain.c
@@ -72,3 +72,17 @@
// RUN: %clang -### --target=avr --sysroot=%S/Inputs/basic_avr_tree -mmcu=atmega328 %s -fuse-ld=lld -T avr.lds 2>&1 | FileCheck --check-prefix=LDS1 %s
// LDS1: "-T" "avr.lds"
// LDS1-NOT: "-mavr5"
+
+// RUN: %clang %s -### --target=avr -mmcu=atmega328 --sysroot=%S/Inputs/basic_avr_tree/ -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir 2>&1 | FileCheck --check-prefix=LIBGCC %s
+// RUN: %clang %s -### --target=avr -mmcu=atmega328 --sysroot=%S/Inputs/basic_avr_tree/ -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir --rtlib=libgcc 2>&1 | FileCheck --check-prefix=LIBGCC %s
+// LIBGCC: "-lgcc"
+// LIBGCC-NOT: libclang_rt
+
+// RUN: %clang %s -### --target=avr -mmcu=atmega328 --sysroot=%S/Inputs/basic_avr_tree/ -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir --rtlib=compiler-rt 2>&1 | FileCheck --check-prefix=COMRT %s
+// COMRT: avr5/libclang_rt.builtins-avr.a
+// COMRT-NOT: "-lgcc"
+
+// RUN: %clang %s -### --target=avr --sysroot=%S/Inputs/basic_avr_tree/ -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir --rtlib=compiler-rt 2>&1 | FileCheck --check-prefix=NOMCU %s
+// RUN: %clang %s -### --target=avr --sysroot=%S/Inputs/basic_avr_tree/ -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir --rtlib=libgcc 2>&1 | FileCheck --check-prefix=NOMCU %s
+// NOMCU-NOT: libclang_rt
+// NOMCU-NOT: "-lgcc"
Index: clang/lib/Driver/ToolChains/AVR.h
===================================================================
--- clang/lib/Driver/ToolChains/AVR.h
+++ clang/lib/Driver/ToolChains/AVR.h
@@ -33,12 +33,14 @@
llvm::Optional<std::string> findAVRLibcInstallation() const;
StringRef getGCCInstallPath() const { return GCCInstallPath; }
+ std::string getCompilerRTPath() const override;
protected:
Tool *buildLinker() const override;
private:
StringRef GCCInstallPath;
+ std::string MCU;
};
} // end namespace toolchains
Index: clang/lib/Driver/ToolChains/AVR.cpp
===================================================================
--- clang/lib/Driver/ToolChains/AVR.cpp
+++ clang/lib/Driver/ToolChains/AVR.cpp
@@ -19,6 +19,7 @@
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
using namespace clang::driver;
using namespace clang::driver::toolchains;
@@ -369,8 +370,8 @@
: Generic_ELF(D, Triple, Args) {
GCCInstallation.init(Triple, Args);
- std::string CPU = getCPUName(D, Args, Triple);
- if (CPU.empty())
+ MCU = getCPUName(D, Args, Triple);
+ if (MCU.empty())
D.Diag(diag::warn_drv_avr_mcu_not_specified);
// Only add default libraries if the user hasn't explicitly opted out.
@@ -418,6 +419,19 @@
return new tools::AVR::Linker(getTriple(), *this);
}
+std::string AVRToolChain::getCompilerRTPath() const {
+ // Return the default path appended with device family name, such as
+ // `$RESOURCE_DIR/lib/avr5`, since we expect each device family has its
+ // own optimized compiler-rt library files.
+ // If no `-mmcu=` is specified, it falls back to the default path. However
+ // this is unexpected, since avr can not be a host environment.
+ SmallString<128> Path(ToolChain::getCompilerRTPath());
+ Optional<StringRef> FamilyName = GetMCUFamilyName(MCU);
+ if (FamilyName)
+ llvm::sys::path::append(Path, *FamilyName);
+ return std::string(Path.str());
+}
+
void AVR::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs, const ArgList &Args,
@@ -447,6 +461,12 @@
Args.AddAllArgs(CmdArgs, options::OPT_L);
getToolChain().AddFilePathLibArgs(Args, CmdArgs);
+ // Currently we only support libgcc and compiler-rt.
+ auto RtLib = TC.GetRuntimeLibType(Args);
+ assert(
+ (RtLib == ToolChain::RLT_Libgcc || RtLib == ToolChain::RLT_CompilerRT) &&
+ "unknown runtime library");
+
// Only add default libraries if the user hasn't explicitly opted out.
bool LinkStdlib = false;
if (!Args.hasArg(options::OPT_nostdlib) &&
@@ -462,10 +482,13 @@
D.Diag(diag::warn_drv_avr_libc_not_found);
} else {
std::string SubPath = GetMCUSubPath(CPU);
+ // Add path of avr-libc.
CmdArgs.push_back(
Args.MakeArgString(Twine("-L") + *AVRLibcRoot + "/lib/" + SubPath));
- CmdArgs.push_back(
- Args.MakeArgString("-L" + TC.getGCCInstallPath() + "/" + SubPath));
+ // Add path of libgcc.
+ if (RtLib == ToolChain::RLT_Libgcc)
+ CmdArgs.push_back(Args.MakeArgString("-L" + TC.getGCCInstallPath() +
+ "/" + SubPath));
LinkStdlib = true;
}
}
@@ -494,7 +517,11 @@
std::string CrtFileName = std::string("-l:crt") + CPU + std::string(".o");
CmdArgs.push_back(Args.MakeArgString(CrtFileName));
- CmdArgs.push_back("-lgcc");
+ // Link to libgcc.
+ if (RtLib == ToolChain::RLT_Libgcc)
+ CmdArgs.push_back("-lgcc");
+
+ // Link to generic libraries of avr-libc.
CmdArgs.push_back("-lm");
CmdArgs.push_back("-lc");
@@ -503,6 +530,14 @@
CmdArgs.push_back("--end-group");
+ // Link to compiler-rt.
+ if (RtLib == ToolChain::RLT_CompilerRT) {
+ std::string RtLib =
+ getToolChain().getCompilerRT(Args, "builtins", ToolChain::FT_Static);
+ if (llvm::sys::fs::exists(RtLib))
+ CmdArgs.push_back(Args.MakeArgString(RtLib));
+ }
+
// Add user specified linker script.
Args.AddAllArgs(CmdArgs, options::OPT_T);
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