[clang] 5cf3e0e - [Clang][Hexagon] Use --cstdlib flag to choose Picolibc (#183257)
via cfe-commits
cfe-commits at lists.llvm.org
Thu Apr 16 06:34:19 PDT 2026
Author: quic-k
Date: 2026-04-16T08:34:14-05:00
New Revision: 5cf3e0e65b0535104f456e8159b1c80ab40677b5
URL: https://github.com/llvm/llvm-project/commit/5cf3e0e65b0535104f456e8159b1c80ab40677b5
DIFF: https://github.com/llvm/llvm-project/commit/5cf3e0e65b0535104f456e8159b1c80ab40677b5.diff
LOG: [Clang][Hexagon] Use --cstdlib flag to choose Picolibc (#183257)
Update the Hexagon toolchain to use --cstdlib flag to allow users to
choose Picolibc as the C library.
This allows proper selection of C library when targeting
Hexagon environments.
depends on https://github.com/llvm/llvm-project/pull/183254
Signed-off-by: Kushal Pal <kushpal at qti.qualcomm.com>
Added:
clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/readme
clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/v1/readme
clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/readme
clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/readme
clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/readme
clang/test/Driver/hexagon-toolchain-picolibc.c
Modified:
clang/lib/Driver/ToolChains/Hexagon.cpp
clang/lib/Driver/ToolChains/Hexagon.h
Removed:
################################################################################
diff --git a/clang/lib/Driver/ToolChains/Hexagon.cpp b/clang/lib/Driver/ToolChains/Hexagon.cpp
index 801682eef57d3..e0e5ab5c1fde7 100644
--- a/clang/lib/Driver/ToolChains/Hexagon.cpp
+++ b/clang/lib/Driver/ToolChains/Hexagon.cpp
@@ -412,18 +412,26 @@ constructHexagonLinkArgs(Compilation &C, const JobAction &JA,
if (IncStdLib && IncStartFiles) {
if (!IsShared) {
- if (HasStandalone) {
- SmallString<128> Crt0SA = LibraryDir;
- llvm::sys::path::append(Crt0SA, "crt0_standalone.o");
- CmdArgs.push_back(Args.MakeArgString(Crt0SA));
+ if (HTC.GetCStdlibType(Args) == ToolChain::CST_Picolibc) {
+ SmallString<128> Crt0 = LibraryDir;
+ llvm::sys::path::append(Crt0, "crt0-semihost.o");
+ CmdArgs.push_back(Args.MakeArgString(Crt0));
+ } else {
+ if (HasStandalone) {
+ SmallString<128> Crt0SA = LibraryDir;
+ llvm::sys::path::append(Crt0SA, "crt0_standalone.o");
+ CmdArgs.push_back(Args.MakeArgString(Crt0SA));
+ }
+ SmallString<128> Crt0 = LibraryDir;
+ llvm::sys::path::append(Crt0, "crt0.o");
+ CmdArgs.push_back(Args.MakeArgString(Crt0));
}
- SmallString<128> Crt0 = LibraryDir;
- llvm::sys::path::append(Crt0, "crt0.o");
- CmdArgs.push_back(Args.MakeArgString(Crt0));
}
- SmallString<128> Init = LibraryDir;
- llvm::sys::path::append(Init, UseShared ? "initS.o" : "init.o");
- CmdArgs.push_back(Args.MakeArgString(Init));
+ if (HTC.GetCStdlibType(Args) != ToolChain::CST_Picolibc) {
+ SmallString<128> Init = LibraryDir;
+ llvm::sys::path::append(Init, UseShared ? "initS.o" : "init.o");
+ CmdArgs.push_back(Args.MakeArgString(Init));
+ }
}
//----------------------------------------------------------------------------
@@ -459,12 +467,23 @@ constructHexagonLinkArgs(Compilation &C, const JobAction &JA,
CmdArgs.push_back("--start-group");
if (!IsShared) {
- for (StringRef Lib : OsLibs)
- CmdArgs.push_back(Args.MakeArgString("-l" + Lib));
+ if (HTC.GetCStdlibType(Args) == ToolChain::CST_Picolibc) {
+ CmdArgs.push_back("-lsemihost");
+ } else {
+ for (StringRef Lib : OsLibs)
+ CmdArgs.push_back(Args.MakeArgString("-l" + Lib));
+ }
if (!Args.hasArg(options::OPT_nolibc))
CmdArgs.push_back("-lc");
}
- CmdArgs.push_back("-lgcc");
+ if (HTC.GetCStdlibType(Args) == ToolChain::CST_Picolibc) {
+ if (HTC.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT)
+ CmdArgs.push_back("-lclang_rt.builtins");
+ else
+ CmdArgs.push_back("-lgcc");
+ } else {
+ CmdArgs.push_back("-lgcc");
+ }
CmdArgs.push_back("--end-group");
}
@@ -473,9 +492,11 @@ constructHexagonLinkArgs(Compilation &C, const JobAction &JA,
// End files
//----------------------------------------------------------------------------
if (IncStdLib && IncStartFiles) {
- SmallString<128> Fini = LibraryDir;
- llvm::sys::path::append(Fini, UseShared ? "finiS.o" : "fini.o");
- CmdArgs.push_back(Args.MakeArgString(Fini));
+ if (HTC.GetCStdlibType(Args) != ToolChain::CST_Picolibc) {
+ SmallString<128> Fini = LibraryDir;
+ llvm::sys::path::append(Fini, UseShared ? "finiS.o" : "fini.o");
+ CmdArgs.push_back(Args.MakeArgString(Fini));
+ }
}
}
@@ -515,18 +536,22 @@ std::string HexagonToolChain::getHexagonTargetDir(
return std::string(Dir);
}
-SmallString<128> HexagonToolChain::getEffectiveSysRoot() const {
+SmallString<128>
+HexagonToolChain::getEffectiveSysRoot(const ArgList &Args) const {
const Driver &D = getDriver();
// The user-specified `--sysroot` always takes precedence.
if (!D.SysRoot.empty())
return SmallString<128>(D.SysRoot);
- // Otherwise, pick a path relative to the install directory. Try a triple
- // subdirectory first.
SmallString<128> Dir(getHexagonTargetDir(D.Dir, D.PrefixDirs));
+ // For Picolibc, use picolibc/<triple> with no fallback.
+ if (GetCStdlibType(Args) == ToolChain::CST_Picolibc) {
+ llvm::sys::path::append(Dir, "picolibc", getTriple().normalize());
+ return Dir;
+ }
+ // Otherwise, try a triple subdirectory first, then fall back to "hexagon".
llvm::sys::path::append(Dir, getTriple().normalize());
if (getVFS().exists(Dir))
return Dir;
- // Otherwise, fall back to "../target/hexagon".
Dir = getHexagonTargetDir(D.Dir, D.PrefixDirs);
llvm::sys::path::append(Dir, "hexagon");
return Dir;
@@ -535,7 +560,7 @@ SmallString<128> HexagonToolChain::getEffectiveSysRoot() const {
void HexagonToolChain::getLibraryDir(const ArgList &Args,
llvm::SmallString<128> &Dir) const {
bool IsLinuxMusl = getTriple().isMusl() && getTriple().isOSLinux();
- const llvm::SmallString<128> SysRoot = getEffectiveSysRoot();
+ const llvm::SmallString<128> SysRoot = getEffectiveSysRoot(Args);
// Linux toolchain uses "usr/lib" but it also should accept "lib" in case an
// external sysroot is used. Similar logic is for include paths.
if (IsLinuxMusl) {
@@ -557,9 +582,10 @@ void HexagonToolChain::getLibraryDir(const ArgList &Args,
llvm::sys::path::append(Dir, "pic");
}
-void HexagonToolChain::getBaseIncludeDir(llvm::SmallString<128> &Dir) const {
+void HexagonToolChain::getBaseIncludeDir(const ArgList &Args,
+ llvm::SmallString<128> &Dir) const {
bool IsLinuxMusl = getTriple().isMusl() && getTriple().isOSLinux();
- const llvm::SmallString<128> SysRoot = getEffectiveSysRoot();
+ const llvm::SmallString<128> SysRoot = getEffectiveSysRoot(Args);
if (IsLinuxMusl) {
Dir = SysRoot;
llvm::sys::path::append(Dir, "usr", "include");
@@ -613,7 +639,7 @@ void HexagonToolChain::getHexagonLibraryPaths(const ArgList &Args,
std::copy(D.PrefixDirs.begin(), D.PrefixDirs.end(),
std::back_inserter(RootDirs));
- std::string SysRoot(getEffectiveSysRoot());
+ std::string SysRoot(getEffectiveSysRoot(Args));
if (!llvm::is_contained(RootDirs, SysRoot))
RootDirs.push_back(SysRoot);
@@ -776,11 +802,11 @@ void HexagonToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
}
if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) {
SmallString<128> CIncludeDir;
- getBaseIncludeDir(CIncludeDir);
+ getBaseIncludeDir(DriverArgs, CIncludeDir);
addExternCSystemInclude(DriverArgs, CC1Args, std::string(CIncludeDir));
bool IsLinuxMusl = getTriple().isMusl() && getTriple().isOSLinux();
if (IsLinuxMusl) {
- SmallString<128> LocalIncludeDir = getEffectiveSysRoot();
+ SmallString<128> LocalIncludeDir = getEffectiveSysRoot(DriverArgs);
llvm::sys::path::append(LocalIncludeDir, "usr", "local", "include");
addSystemInclude(DriverArgs, CC1Args, LocalIncludeDir);
}
@@ -793,7 +819,7 @@ void HexagonToolChain::addLibCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
SmallString<128> Dir;
- getBaseIncludeDir(Dir);
+ getBaseIncludeDir(DriverArgs, Dir);
llvm::sys::path::append(Dir, "c++", "v1");
addLibStdCXXIncludePaths(Dir, "", "", DriverArgs, CC1Args);
}
@@ -802,16 +828,36 @@ void HexagonToolChain::addLibStdCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
SmallString<128> Dir;
- getBaseIncludeDir(Dir);
+ getBaseIncludeDir(DriverArgs, Dir);
llvm::sys::path::append(Dir, "c++");
addLibStdCXXIncludePaths(Dir, "", "", DriverArgs, CC1Args);
}
+ToolChain::RuntimeLibType
+HexagonToolChain::GetRuntimeLibType(const ArgList &Args) const {
+ if (GetCStdlibType(Args) == ToolChain::CST_Picolibc) {
+ if (Args.getLastArg(options::OPT_rtlib_EQ))
+ return ToolChain::GetRuntimeLibType(Args);
+ return ToolChain::RLT_CompilerRT;
+ }
+ return ToolChain::GetRuntimeLibType(Args);
+}
+
+ToolChain::UnwindLibType
+HexagonToolChain::GetUnwindLibType(const ArgList &Args) const {
+ if (GetCStdlibType(Args) == ToolChain::CST_Picolibc) {
+ if (Args.getLastArg(options::OPT_unwindlib_EQ))
+ return ToolChain::GetUnwindLibType(Args);
+ return ToolChain::UNW_CompilerRT;
+ }
+ return ToolChain::GetUnwindLibType(Args);
+}
+
ToolChain::CXXStdlibType
HexagonToolChain::GetCXXStdlibType(const ArgList &Args) const {
Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
if (!A) {
- if (getTriple().isMusl())
+ if (getTriple().isMusl() || GetCStdlibType(Args) == ToolChain::CST_Picolibc)
return ToolChain::CST_Libcxx;
else
return ToolChain::CST_Libstdcxx;
diff --git a/clang/lib/Driver/ToolChains/Hexagon.h b/clang/lib/Driver/ToolChains/Hexagon.h
index 63dd7d78395e7..b54e4b160938b 100644
--- a/clang/lib/Driver/ToolChains/Hexagon.h
+++ b/clang/lib/Driver/ToolChains/Hexagon.h
@@ -92,6 +92,11 @@ class LLVM_LIBRARY_VISIBILITY HexagonToolChain : public Linux {
return getTriple().isMusl() ? "ld.lld" : "hexagon-link";
}
+ RuntimeLibType
+ GetRuntimeLibType(const llvm::opt::ArgList &Args) const override;
+
+ UnwindLibType GetUnwindLibType(const llvm::opt::ArgList &Args) const override;
+
CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const override;
void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
@@ -102,8 +107,9 @@ class LLVM_LIBRARY_VISIBILITY HexagonToolChain : public Linux {
std::string getHexagonTargetDir(
const std::string &InstalledDir,
const SmallVectorImpl<std::string> &PrefixDirs) const;
- SmallString<128> getEffectiveSysRoot() const;
- void getBaseIncludeDir(llvm::SmallString<128> &) const;
+ SmallString<128> getEffectiveSysRoot(const llvm::opt::ArgList &Args) const;
+ void getBaseIncludeDir(const llvm::opt::ArgList &Args,
+ llvm::SmallString<128> &) const;
void getLibraryDir(const llvm::opt::ArgList &Args,
llvm::SmallString<128> &) const;
void getHexagonLibraryPaths(const llvm::opt::ArgList &Args,
diff --git a/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/readme b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/readme
new file mode 100644
index 0000000000000..b2876ab36e599
--- /dev/null
+++ b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/readme
@@ -0,0 +1,4 @@
+Git does not record empty directories. Create a dummy file in each directory
+here. Strictly speaking, putting dummy files in leaf directories should be
+sufficient, but adding them everywhere reduces the risk of repeating the same
+problem in case new directories are added.
\ No newline at end of file
diff --git a/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/v1/readme b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/v1/readme
new file mode 100644
index 0000000000000..b2876ab36e599
--- /dev/null
+++ b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/c++/v1/readme
@@ -0,0 +1,4 @@
+Git does not record empty directories. Create a dummy file in each directory
+here. Strictly speaking, putting dummy files in leaf directories should be
+sufficient, but adding them everywhere reduces the risk of repeating the same
+problem in case new directories are added.
\ No newline at end of file
diff --git a/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/readme b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/readme
new file mode 100644
index 0000000000000..b2876ab36e599
--- /dev/null
+++ b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/include/readme
@@ -0,0 +1,4 @@
+Git does not record empty directories. Create a dummy file in each directory
+here. Strictly speaking, putting dummy files in leaf directories should be
+sufficient, but adding them everywhere reduces the risk of repeating the same
+problem in case new directories are added.
\ No newline at end of file
diff --git a/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/readme b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/readme
new file mode 100644
index 0000000000000..b2876ab36e599
--- /dev/null
+++ b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/hexagon-unknown-none-elf/readme
@@ -0,0 +1,4 @@
+Git does not record empty directories. Create a dummy file in each directory
+here. Strictly speaking, putting dummy files in leaf directories should be
+sufficient, but adding them everywhere reduces the risk of repeating the same
+problem in case new directories are added.
\ No newline at end of file
diff --git a/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/readme b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/readme
new file mode 100644
index 0000000000000..b2876ab36e599
--- /dev/null
+++ b/clang/test/Driver/Inputs/hexagon_tree/Tools/target/picolibc/readme
@@ -0,0 +1,4 @@
+Git does not record empty directories. Create a dummy file in each directory
+here. Strictly speaking, putting dummy files in leaf directories should be
+sufficient, but adding them everywhere reduces the risk of repeating the same
+problem in case new directories are added.
\ No newline at end of file
diff --git a/clang/test/Driver/hexagon-toolchain-picolibc.c b/clang/test/Driver/hexagon-toolchain-picolibc.c
new file mode 100644
index 0000000000000..eec0ec4f23b45
--- /dev/null
+++ b/clang/test/Driver/hexagon-toolchain-picolibc.c
@@ -0,0 +1,120 @@
+// REQUIRES: hexagon-registered-target
+
+// -----------------------------------------------------------------------------
+// Test standard include paths
+// -----------------------------------------------------------------------------
+// RUN: %clang -### --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin %s 2>&1 | FileCheck -check-prefix=CHECK-C-INCLUDES %s
+// CHECK-C-INCLUDES: "-cc1" {{.*}} "-internal-isystem" "{{.*}}{{/|\\\\}}lib{{/|\\\\}}clang{{/|\\\\}}{{[0-9]+}}{{/|\\\\}}include"
+// CHECK-C-INCLUDES: "-internal-externc-isystem" "{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}include"
+
+// RUN: %clangxx -### --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin %s 2>&1 | FileCheck -check-prefix=CHECK-CXX-INCLUDES %s
+// CHECK-CXX-INCLUDES: "-cc1" {{.*}} "-internal-isystem" "{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}include{{/|\\\\}}c++{{/|\\\\}}v1"
+// CHECK-CXX-INCLUDES: "-internal-isystem" "{{.*}}{{/|\\\\}}lib{{/|\\\\}}clang{{/|\\\\}}{{[0-9]+}}{{/|\\\\}}include"
+// CHECK-CXX-INCLUDES: "-internal-externc-isystem" "{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}include"
+// -----------------------------------------------------------------------------
+// Passing start files for Picolibc
+// -----------------------------------------------------------------------------
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-STARTUP
+// CHECK-STARTUP: "{{.*}}crt0-semihost.o"
+//
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc -nostartfiles -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-NOSTART
+// CHECK-NOSTART-NOT: "{{.*}}crt0-semihost.o"
+// -----------------------------------------------------------------------------
+// Passing -nostdlib, -nostartfiles, -nodefaultlibs, -nolibc
+// -----------------------------------------------------------------------------
+// RUN: %clangxx -### --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
+// RUN: -mcpu=hexagonv60 \
+// RUN: -nostdlib %s 2>&1 | FileCheck -check-prefix=CHECK-NOSTDLIB %s
+// CHECK-NOSTDLIB: "-cc1"
+// CHECK-NOSTDLIB: {{hexagon-link|ld}}
+// CHECK-NOSTDLIB-NOT: {{.*}}crt0-semihost.o
+// CHECK-NOSTDLIB-NOT: "-lc++"
+// CHECK-NOSTDLIB-NOT: "-lm"
+// CHECK-NOSTDLIB-NOT: "--start-group"
+// CHECK-NOSTDLIB-NOT: "-lsemihost"
+// CHECK-NOSTDLIB-NOT: "-lc"
+// CHECK-NOSTDLIB-NOT: "-l{{(clang_rt\.builtins)}}"
+// CHECK-NOSTDLIB-NOT: "--end-group"
+
+// RUN: %clangxx -### --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
+// RUN: -mcpu=hexagonv60 \
+// RUN: -nostartfiles %s 2>&1 | FileCheck -check-prefix=CHECK-NOSTARTFILES %s
+// CHECK-NOSTARTFILES: "-cc1"
+// CHECK-NOSTARTFILES: {{hexagon-link|ld}}
+// CHECK-NOSTARTFILES-NOT: {{.*}}crt0-semihost.o
+// CHECK-NOSTARTFILES: "-lc++" "-lc++abi" "-lunwind" "-lm" "--start-group" "-lsemihost" "-lc" "-lclang_rt.builtins" "--end-group"
+
+// RUN: %clangxx -### --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
+// RUN: -mcpu=hexagonv60 \
+// RUN: -nodefaultlibs %s 2>&1 | FileCheck -check-prefix=CHECK-NODEFAULTLIBS %s
+// CHECK-NODEFAULTLIBS: "-cc1"
+// CHECK-NODEFAULTLIBS: {{hexagon-link|ld}}
+// CHECK-NODEFAULTLIBS: "{{.*}}crt0-semihost.o"
+// CHECK-NODEFAULTLIBS-NOT: "-lc++"
+// CHECK-NODEFAULTLIBS-NOT: "-lm"
+// CHECK-NODEFAULTLIBS-NOT: "--start-group"
+// CHECK-NODEFAULTLIBS-NOT: "-lsemihost"
+// CHECK-NODEFAULTLIBS-NOT: "-lc"
+// CHECK-NODEFAULTLIBS-NOT: "-lclang_rt.builtins"
+// CHECK-NODEFAULTLIBS-NOT: "--end-group"
+
+// RUN: %clangxx -### --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin -mcpu=hexagonv60 \
+// RUN: -nolibc %s 2>&1 | FileCheck -check-prefix=CHECK-NOLIBC %s
+// CHECK-NOLIBC: "-cc1"
+// CHECK-NOLIBC: hexagon-link
+// CHECK-NOLIBC-SAME: "{{.*}}crt0-semihost.o"
+// CHECK-NOLIBC-SAME: "-lc++"
+// CHECK-NOLIBC-SAME: "-lm"
+// CHECK-NOLIBC-SAME: "--start-group"
+// CHECK-NOLIBC-SAME: "-lsemihost"
+// CHECK-NOLIBC-NOT: "-lc"
+// CHECK-NOLIBC-SAME: "-lclang_rt.builtins"
+// CHECK-NOLIBC-SAME: "--end-group"
+// -----------------------------------------------------------------------------
+// Force compiler-rt when Picolibc is selected
+// -----------------------------------------------------------------------------
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-RTLIB
+// RUN: %clangxx --target=hexagon-none-elf --cstdlib=picolibc -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-RTLIB
+// CHECK-RTLIB: "-lclang_rt.builtins"
+// CHECK-RTLIB-NOT: "-lgcc"
+// -----------------------------------------------------------------------------
+// Allow --rtlib to override the default compiler-rt when Picolibc is selected
+// -----------------------------------------------------------------------------
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc --rtlib=libgcc -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-RTLIB-OVERRIDE
+// CHECK-RTLIB-OVERRIDE: "-lgcc"
+// CHECK-RTLIB-OVERRIDE-NOT: "-lclang_rt.builtins"
+// -----------------------------------------------------------------------------
+// libunwind is linked by default for C++ when Picolibc is selected; user can
+// override with --unwindlib=
+// -----------------------------------------------------------------------------
+// RUN: %clangxx --target=hexagon-none-elf --cstdlib=picolibc -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-CXX-UNWIND
+// CHECK-CXX-UNWIND: "-lunwind"
+// RUN: %clangxx --target=hexagon-none-elf --cstdlib=picolibc --unwindlib=none -### %s 2>&1 | FileCheck %s --check-prefix=CHECK-UNWIND-OVERRIDE
+// CHECK-UNWIND-OVERRIDE-NOT: "-lunwind"
+// -----------------------------------------------------------------------------
+// Library search paths
+// -----------------------------------------------------------------------------
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
+// RUN: -mcpu=hexagonv68 -### %s 2>&1 | FileCheck -check-prefix=CHECK-LIBPATHS %s
+// CHECK-LIBPATHS: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68"
+// CHECK-LIBPATHS-NOT: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68{{/|\\\\}}G0"
+
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
+// RUN: -mcpu=hexagonv68 -G0 -### %s 2>&1 | FileCheck -check-prefix=CHECK-LIBPATHS-G0 %s
+// CHECK-LIBPATHS-G0: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68{{/|\\\\}}G0"
+// CHECK-LIBPATHS-G0: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68"
+
+// RUN: %clang --target=hexagon-none-elf --cstdlib=picolibc \
+// RUN: -ccc-install-dir %S/Inputs/hexagon_tree/Tools/bin \
+// RUN: -mcpu=hexagonv68 -fpic -### %s 2>&1 | FileCheck -check-prefix=CHECK-LIBPATHS-PIC %s
+// CHECK-LIBPATHS-PIC: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68{{/|\\\\}}G0{{/|\\\\}}pic"
+// CHECK-LIBPATHS-PIC: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68{{/|\\\\}}G0"
+// CHECK-LIBPATHS-PIC: "-L{{.*}}{{/|\\\\}}Inputs{{/|\\\\}}hexagon_tree{{/|\\\\}}Tools{{/|\\\\}}bin{{/|\\\\}}..{{/|\\\\}}target{{/|\\\\}}picolibc{{/|\\\\}}hexagon-unknown-none-elf{{/|\\\\}}lib{{/|\\\\}}v68"
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