https://github.com/jeremyd2019 updated
https://github.com/llvm/llvm-project/pull/135691
>From 949ec2a683faf53652b21a4c90206befa498bf4e Mon Sep 17 00:00:00 2001
From: Jeremy Drake <git...@jdrake.com>
Date: Mon, 14 Apr 2025 10:37:59 -0700
Subject: [PATCH 1/2] [Clang] [Driver] add a Cygwin ToolChain
Add a new Cygwin toolchain that just goes through the motions to
initialize the Generic_GCC base properly. This allows removing some
old, almost certainly wrong hard-coded paths from
Lex/InitHeaderSearch.cpp
Signed-off-by: Jeremy Drake <git...@jdrake.com>
---
clang/lib/Driver/CMakeLists.txt | 1 +
clang/lib/Driver/Driver.cpp | 4 +
clang/lib/Driver/ToolChains/Cygwin.cpp | 109 +++++++++++++++++++++++++
clang/lib/Driver/ToolChains/Cygwin.h | 36 ++++++++
clang/lib/Driver/ToolChains/Gnu.cpp | 21 +++++
clang/lib/Lex/InitHeaderSearch.cpp | 86 +------------------
6 files changed, 174 insertions(+), 83 deletions(-)
create mode 100644 clang/lib/Driver/ToolChains/Cygwin.cpp
create mode 100644 clang/lib/Driver/ToolChains/Cygwin.h
diff --git a/clang/lib/Driver/CMakeLists.txt b/clang/lib/Driver/CMakeLists.txt
index 5bdb6614389cf..e72525e99d517 100644
--- a/clang/lib/Driver/CMakeLists.txt
+++ b/clang/lib/Driver/CMakeLists.txt
@@ -51,6 +51,7 @@ add_clang_library(clangDriver
ToolChains/CrossWindows.cpp
ToolChains/CSKYToolChain.cpp
ToolChains/Cuda.cpp
+ ToolChains/Cygwin.cpp
ToolChains/Darwin.cpp
ToolChains/DragonFly.cpp
ToolChains/Flang.cpp
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 90d8e823d1d02..9b2264bbc9eaa 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -17,6 +17,7 @@
#include "ToolChains/Clang.h"
#include "ToolChains/CrossWindows.h"
#include "ToolChains/Cuda.h"
+#include "ToolChains/Cygwin.h"
#include "ToolChains/Darwin.h"
#include "ToolChains/DragonFly.h"
#include "ToolChains/FreeBSD.h"
@@ -6849,6 +6850,9 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
case llvm::Triple::GNU:
TC = std::make_unique<toolchains::MinGW>(*this, Target, Args);
break;
+ case llvm::Triple::Cygnus:
+ TC = std::make_unique<toolchains::Cygwin>(*this, Target, Args);
+ break;
case llvm::Triple::Itanium:
TC = std::make_unique<toolchains::CrossWindowsToolChain>(*this, Target,
Args);
diff --git a/clang/lib/Driver/ToolChains/Cygwin.cpp
b/clang/lib/Driver/ToolChains/Cygwin.cpp
new file mode 100644
index 0000000000000..c310f096a5d74
--- /dev/null
+++ b/clang/lib/Driver/ToolChains/Cygwin.cpp
@@ -0,0 +1,109 @@
+//===--- Cygwin.cpp - Cygwin ToolChain Implementations ----------*- C++
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Cygwin.h"
+#include "CommonArgs.h"
+#include "clang/Config/config.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Options.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/VirtualFileSystem.h"
+
+using namespace clang::driver;
+using namespace clang::driver::toolchains;
+using namespace clang;
+using namespace llvm::opt;
+
+using tools::addPathIfExists;
+
+Cygwin::Cygwin(const Driver &D, const llvm::Triple &Triple, const ArgList
&Args)
+ : Generic_GCC(D, Triple, Args) {
+ GCCInstallation.init(Triple, Args);
+ std::string SysRoot = computeSysRoot();
+ ToolChain::path_list &PPaths = getProgramPaths();
+
+ Generic_GCC::PushPPaths(PPaths);
+
+ path_list &Paths = getFilePaths();
+
+ Generic_GCC::AddMultiarchPaths(D, SysRoot, "lib", Paths);
+
+ // Similar to the logic for GCC above, if we are currently running Clang
+ // inside of the requested system root, add its parent library path to those
+ // searched.
+ // FIXME: It's not clear whether we should use the driver's installed
+ // directory ('Dir' below) or the ResourceDir.
+ if (StringRef(D.Dir).starts_with(SysRoot))
+ addPathIfExists(D, D.Dir + "/../lib", Paths);
+
+ addPathIfExists(D, SysRoot + "/lib", Paths);
+ addPathIfExists(D, SysRoot + "/usr/lib", Paths);
+ addPathIfExists(D, SysRoot + "/usr/lib/w32api", Paths);
+}
+
+llvm::ExceptionHandling Cygwin::GetExceptionModel(const ArgList &Args) const {
+ if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::aarch64
||
+ getArch() == llvm::Triple::arm || getArch() == llvm::Triple::thumb)
+ return llvm::ExceptionHandling::WinEH;
+ return llvm::ExceptionHandling::DwarfCFI;
+}
+
+void Cygwin::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
+ ArgStringList &CC1Args) const {
+ const Driver &D = getDriver();
+ std::string SysRoot = computeSysRoot();
+
+ if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
+ return;
+
+ if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
+ addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
+
+ if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
+ SmallString<128> P(D.ResourceDir);
+ llvm::sys::path::append(P, "include");
+ addSystemInclude(DriverArgs, CC1Args, P);
+ }
+
+ if (DriverArgs.hasArg(options::OPT_nostdlibinc))
+ return;
+
+ // Check for configure-time C include directories.
+ StringRef CIncludeDirs(C_INCLUDE_DIRS);
+ if (CIncludeDirs != "") {
+ SmallVector<StringRef, 5> Dirs;
+ CIncludeDirs.split(Dirs, ":");
+ for (StringRef Dir : Dirs) {
+ StringRef Prefix =
+ llvm::sys::path::is_absolute(Dir) ? "" : StringRef(SysRoot);
+ addExternCSystemInclude(DriverArgs, CC1Args, Prefix + Dir);
+ }
+ return;
+ }
+
+ // Lacking those, try to detect the correct set of system includes for the
+ // target triple.
+
+ AddMultilibIncludeArgs(DriverArgs, CC1Args);
+
+ // On systems using multiarch, add /usr/include/$triple before
+ // /usr/include.
+ std::string MultiarchIncludeDir = getTriple().str();
+ if (!MultiarchIncludeDir.empty() &&
+ D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir))
+ addExternCSystemInclude(DriverArgs, CC1Args,
+ SysRoot + "/usr/include/" + MultiarchIncludeDir);
+
+ // Add an include of '/include' directly. This isn't provided by default by
+ // system GCCs, but is often used with cross-compiling GCCs, and harmless to
+ // add even when Clang is acting as-if it were a system compiler.
+ addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include");
+
+ addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
+ addExternCSystemInclude(DriverArgs, CC1Args, SysRoot +
"/usr/include/w32api");
+}
diff --git a/clang/lib/Driver/ToolChains/Cygwin.h
b/clang/lib/Driver/ToolChains/Cygwin.h
new file mode 100644
index 0000000000000..a4c0ee86a3c97
--- /dev/null
+++ b/clang/lib/Driver/ToolChains/Cygwin.h
@@ -0,0 +1,36 @@
+//===--- Cygwin.h - Cygwin ToolChain Implementations ------------*- C++
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_Cygwin_H
+#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_Cygwin_H
+
+#include "Gnu.h"
+#include "clang/Driver/ToolChain.h"
+
+namespace clang {
+namespace driver {
+namespace toolchains {
+
+class LLVM_LIBRARY_VISIBILITY Cygwin : public Generic_GCC {
+public:
+ Cygwin(const Driver &D, const llvm::Triple &Triple,
+ const llvm::opt::ArgList &Args);
+
+ llvm::ExceptionHandling
+ GetExceptionModel(const llvm::opt::ArgList &Args) const override;
+
+ void
+ AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+ llvm::opt::ArgStringList &CC1Args) const override;
+};
+
+} // end namespace toolchains
+} // end namespace driver
+} // end namespace clang
+
+#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_Cygwin_H
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp
b/clang/lib/Driver/ToolChains/Gnu.cpp
index d53039f6302d2..a1fdb7a803c20 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2632,6 +2632,27 @@ void
Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
return;
}
+ if (TargetTriple.isWindowsCygwinEnvironment()) {
+ static const char *const CygwinX86Triples[] = {"i686-pc-cygwin",
+ "i686-pc-msys"};
+ static const char *const CygwinX86_64Triples[] = {"x86_64-pc-cygwin",
+ "x86_64-pc-msys"};
+ LibDirs.push_back("/lib");
+ switch (TargetTriple.getArch()) {
+ case llvm::Triple::x86_64:
+ TripleAliases.append(begin(CygwinX86_64Triples),
+ end(CygwinX86_64Triples));
+ break;
+ case llvm::Triple::x86:
+ TripleAliases.append(begin(CygwinX86Triples), end(CygwinX86Triples));
+ break;
+ default:
+ break;
+ }
+
+ return;
+ }
+
switch (TargetTriple.getArch()) {
case llvm::Triple::aarch64:
LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
diff --git a/clang/lib/Lex/InitHeaderSearch.cpp
b/clang/lib/Lex/InitHeaderSearch.cpp
index bb2a21356fa8f..45bca1834e888 100644
--- a/clang/lib/Lex/InitHeaderSearch.cpp
+++ b/clang/lib/Lex/InitHeaderSearch.cpp
@@ -74,20 +74,10 @@ class InitHeaderSearch {
SystemHeaderPrefixes.emplace_back(std::string(Prefix), IsSystemHeader);
}
- /// Add the necessary paths to support a MinGW libstdc++.
- void AddMinGWCPlusPlusIncludePaths(StringRef Base,
- StringRef Arch,
- StringRef Version);
-
/// Add paths that should always be searched.
void AddDefaultCIncludePaths(const llvm::Triple &triple,
const HeaderSearchOptions &HSOpts);
- /// Add paths that should be searched when compiling c++.
- void AddDefaultCPlusPlusIncludePaths(const LangOptions &LangOpts,
- const llvm::Triple &triple,
- const HeaderSearchOptions &HSOpts);
-
/// Returns true iff AddDefaultIncludePaths should do anything. If this
/// returns false, include paths should instead be handled in the driver.
bool ShouldAddDefaultIncludePaths(const llvm::Triple &triple);
@@ -180,35 +170,14 @@ bool InitHeaderSearch::AddUnmappedPath(const Twine &Path,
IncludeDirGroup Group,
return false;
}
-void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
- StringRef Arch,
- StringRef Version) {
- AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
- CXXSystem, false);
- AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
- CXXSystem, false);
- AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
- CXXSystem, false);
-}
-
void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
const HeaderSearchOptions &HSOpts)
{
if (!ShouldAddDefaultIncludePaths(triple))
llvm_unreachable("Include management is handled in the driver.");
- llvm::Triple::OSType os = triple.getOS();
-
if (HSOpts.UseStandardSystemIncludes) {
- switch (os) {
- case llvm::Triple::Win32:
- if (triple.getEnvironment() != llvm::Triple::Cygnus)
- break;
- [[fallthrough]];
- default:
- // FIXME: temporary hack: hard-coded paths.
- AddPath("/usr/local/include", System, false);
- break;
- }
+ // FIXME: temporary hack: hard-coded paths.
+ AddPath("/usr/local/include", System, false);
}
// Builtin includes use #include_next directives and should be positioned
@@ -236,51 +205,9 @@ void InitHeaderSearch::AddDefaultCIncludePaths(const
llvm::Triple &triple,
return;
}
- switch (os) {
- case llvm::Triple::Win32:
- switch (triple.getEnvironment()) {
- default: llvm_unreachable("Include management is handled in the driver.");
- case llvm::Triple::Cygnus:
- AddPath("/usr/include/w32api", System, false);
- break;
- case llvm::Triple::GNU:
- break;
- }
- break;
- default:
- break;
- }
-
AddPath("/usr/include", ExternCSystem, false);
}
-void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(
- const LangOptions &LangOpts, const llvm::Triple &triple,
- const HeaderSearchOptions &HSOpts) {
- if (!ShouldAddDefaultIncludePaths(triple))
- llvm_unreachable("Include management is handled in the driver.");
-
- // FIXME: temporary hack: hard-coded paths.
- llvm::Triple::OSType os = triple.getOS();
- switch (os) {
- case llvm::Triple::Win32:
- switch (triple.getEnvironment()) {
- default: llvm_unreachable("Include management is handled in the driver.");
- case llvm::Triple::Cygnus:
- // Cygwin-1.7
- AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
- AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
- AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
- // g++-4 / Cygwin-1.5
- AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
- break;
- }
- break;
- default:
- break;
- }
-}
-
bool InitHeaderSearch::ShouldAddDefaultIncludePaths(
const llvm::Triple &triple) {
switch (triple.getOS()) {
@@ -303,15 +230,10 @@ bool InitHeaderSearch::ShouldAddDefaultIncludePaths(
case llvm::Triple::Solaris:
case llvm::Triple::UEFI:
case llvm::Triple::WASI:
+ case llvm::Triple::Win32:
case llvm::Triple::ZOS:
return false;
- case llvm::Triple::Win32:
- if (triple.getEnvironment() != llvm::Triple::Cygnus ||
- triple.isOSBinFormatMachO())
- return false;
- break;
-
case llvm::Triple::UnknownOS:
if (triple.isWasm() || triple.isAppleMachO())
return false;
@@ -355,8 +277,6 @@ void InitHeaderSearch::AddDefaultIncludePaths(
HSOpts.UseStandardCXXIncludes && HSOpts.UseStandardSystemIncludes) {
if (HSOpts.UseLibcxx) {
AddPath("/usr/include/c++/v1", CXXSystem, false);
- } else {
- AddDefaultCPlusPlusIncludePaths(Lang, triple, HSOpts);
}
}
>From 1478096339a85df1bbf096fab8763ad8a4415335 Mon Sep 17 00:00:00 2001
From: Jeremy Drake <git...@jdrake.com>
Date: Tue, 22 Apr 2025 22:30:14 -0700
Subject: [PATCH 2/2] [Clang][Driver] add test for new Cygwin driver
---
.../usr/i686-pc-msys/bin/as | 0
.../usr/i686-pc-msys/bin/ld | 0
.../usr/i686-pc-msys/lib/.keep | 0
.../usr/lib/gcc/i686-pc-msys/10/crtbegin.o | 0
.../lib/gcc/x86_64-pc-cygwin/10/crtbegin.o | 0
.../usr/x86_64-pc-cygwin/bin/as | 0
.../usr/x86_64-pc-cygwin/bin/ld | 0
.../usr/x86_64-pc-cygwin/lib/.keep | 0
.../Inputs/basic_cygwin_tree/include/.keep | 0
.../Driver/Inputs/basic_cygwin_tree/lib/.keep | 0
.../usr/include/c++/10/.keep | 0
.../usr/include/i686-pc-cygwin/.keep | 0
.../usr/include/i686-pc-cygwin/c++/10/.keep | 0
.../usr/include/x86_64-pc-msys/.keep | 0
.../usr/include/x86_64-pc-msys/c++/10/.keep | 0
.../usr/lib/gcc/i686-pc-cygwin/10/crtbegin.o | 0
.../usr/lib/gcc/i686-pc-cygwin/10/crtbeginS.o | 0
.../usr/lib/gcc/x86_64-pc-msys/10/crtbegin.o | 0
.../usr/lib/gcc/x86_64-pc-msys/10/crtbeginS.o | 0
.../usr/lib/i686-pc-cygwin/.keep | 0
.../usr/lib/x86_64-pc-msys/.keep | 0
clang/test/Driver/cygwin.cpp | 77 +++++++++++++++++++
22 files changed, 77 insertions(+)
create mode 100755
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/bin/as
create mode 100755
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/bin/ld
create mode 100644
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/lib/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/i686-pc-msys/10/crtbegin.o
create mode 100644
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/x86_64-pc-cygwin/10/crtbegin.o
create mode 100755
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/bin/as
create mode 100755
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/bin/ld
create mode 100644
clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/lib/.keep
create mode 100644 clang/test/Driver/Inputs/basic_cygwin_tree/include/.keep
create mode 100644 clang/test/Driver/Inputs/basic_cygwin_tree/lib/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/c++/10/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/i686-pc-cygwin/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/i686-pc-cygwin/c++/10/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/x86_64-pc-msys/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/x86_64-pc-msys/c++/10/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/i686-pc-cygwin/10/crtbegin.o
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/i686-pc-cygwin/10/crtbeginS.o
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/x86_64-pc-msys/10/crtbegin.o
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/x86_64-pc-msys/10/crtbeginS.o
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/i686-pc-cygwin/.keep
create mode 100644
clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/x86_64-pc-msys/.keep
create mode 100644 clang/test/Driver/cygwin.cpp
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/bin/as
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/bin/as
new file mode 100755
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/bin/ld
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/bin/ld
new file mode 100755
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/lib/.keep
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/i686-pc-msys/lib/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/i686-pc-msys/10/crtbegin.o
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/i686-pc-msys/10/crtbegin.o
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/x86_64-pc-cygwin/10/crtbegin.o
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/x86_64-pc-cygwin/10/crtbegin.o
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/bin/as
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/bin/as
new file mode 100755
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/bin/ld
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/bin/ld
new file mode 100755
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/lib/.keep
b/clang/test/Driver/Inputs/basic_cross_cygwin_tree/usr/x86_64-pc-cygwin/lib/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/clang/test/Driver/Inputs/basic_cygwin_tree/include/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/include/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/clang/test/Driver/Inputs/basic_cygwin_tree/lib/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/lib/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/c++/10/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/c++/10/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/i686-pc-cygwin/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/i686-pc-cygwin/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/i686-pc-cygwin/c++/10/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/i686-pc-cygwin/c++/10/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/x86_64-pc-msys/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/x86_64-pc-msys/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/x86_64-pc-msys/c++/10/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/include/x86_64-pc-msys/c++/10/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/i686-pc-cygwin/10/crtbegin.o
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/i686-pc-cygwin/10/crtbegin.o
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/i686-pc-cygwin/10/crtbeginS.o
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/i686-pc-cygwin/10/crtbeginS.o
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/x86_64-pc-msys/10/crtbegin.o
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/x86_64-pc-msys/10/crtbegin.o
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/x86_64-pc-msys/10/crtbeginS.o
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/gcc/x86_64-pc-msys/10/crtbeginS.o
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/i686-pc-cygwin/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/i686-pc-cygwin/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git
a/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/x86_64-pc-msys/.keep
b/clang/test/Driver/Inputs/basic_cygwin_tree/usr/lib/x86_64-pc-msys/.keep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/clang/test/Driver/cygwin.cpp b/clang/test/Driver/cygwin.cpp
new file mode 100644
index 0000000000000..f906fe28dfe21
--- /dev/null
+++ b/clang/test/Driver/cygwin.cpp
@@ -0,0 +1,77 @@
+// RUN: %clang -### %s --target=i686-pc-windows-cygnus
--sysroot=%S/Inputs/basic_cygwin_tree \
+// RUN: -resource-dir=%S/Inputs/resource_dir \
+// RUN: --stdlib=platform 2>&1 | FileCheck --check-prefix=CHECK %s
+// CHECK: "-cc1"
+// CHECK-SAME: "-resource-dir" "[[RESOURCE:[^"]+]]"
+// CHECK-SAME: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/i686-pc-cygwin/10/../../../../include/c++/10"
+// CHECK-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/i686-pc-cygwin/10/../../../../include/i686-pc-cygwin/c++/10"
+// CHECK-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/i686-pc-cygwin/10/../../../../include/c++/10/backward"
+// CHECK-SAME: {{^}} "-internal-isystem" "[[SYSROOT]]/usr/local/include"
+// CHECK-SAME: {{^}} "-internal-isystem" "[[RESOURCE]]{{[/\\]}}include"
+// CHECK-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/i686-pc-cygwin/10/../../../../i686-pc-cygwin/include"
+// CHECK-SAME: "-internal-externc-isystem" "[[SYSROOT]]/include"
+// CHECK-SAME: {{^}} "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+// CHECK-SAME: {{^}} "-internal-externc-isystem"
"[[SYSROOT]]/usr/include/w32api"
+// CHECK-SAME: "-femulated-tls"
+// CHECK-SAME: "-exception-model=dwarf"
+// CHECK: "{{.*}}gcc"
+// CHECK-SAME: "-m32"
+
+// RUN: %clang -### %s --target=i686-pc-cygwin
--sysroot=%S/Inputs/basic_cygwin_tree \
+// RUN: --stdlib=platform -static 2>&1 | FileCheck
--check-prefix=CHECK-STATIC %s
+// CHECK-STATIC: "-cc1" "-triple" "i686-pc-windows-cygnus"
+// CHECK-STATIC-SAME: "-static-define"
+// CHECK-STATIC: "{{.*}}gcc"
+// CHECK-STATIC-SAME: "-static"
+
+// RUN: %clang -### %s --target=i686-pc-cygwin
--sysroot=%S/Inputs/basic_cygwin_tree \
+// RUN: -shared 2>&1 | FileCheck --check-prefix=CHECK-SHARED %s
+// CHECK-SHARED: "{{.*}}gcc"
+// CHECK-SHARED-SAME: "-shared"
+
+// RUN: %clang -### -o %t %s 2>&1 -no-integrated-as -fuse-ld=ld \
+// RUN: --gcc-toolchain=%S/Inputs/basic_cross_cygwin_tree/usr \
+// RUN: --target=i686-pc-cygwin \
+// RUN: | FileCheck --check-prefix=CHECK-CROSS %s
+// CHECK-CROSS: "-cc1" "-triple" "i686-pc-windows-cygnus"
+// CHECK-CROSS:
"{{.*}}/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/i686-pc-msys/10/../../../../i686-pc-msys/bin/as"
"--32"
+
+// RUN: %clang -### %s --target=x86_64-pc-windows-cygnus
--sysroot=%S/Inputs/basic_cygwin_tree \
+// RUN: -resource-dir=%S/Inputs/resource_dir \
+// RUN: --stdlib=platform 2>&1 | FileCheck --check-prefix=CHECK-64 %s
+// CHECK-64: "-cc1"
+// CHECK-64-SAME: "-resource-dir" "[[RESOURCE:[^"]+]]"
+// CHECK-64-SAME: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-64-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/x86_64-pc-msys/10/../../../../include/c++/10"
+// CHECK-64-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/x86_64-pc-msys/10/../../../../include/x86_64-pc-msys/c++/10"
+// CHECK-64-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/x86_64-pc-msys/10/../../../../include/c++/10/backward"
+// CHECK-64-SAME: {{^}} "-internal-isystem" "[[SYSROOT]]/usr/local/include"
+// CHECK-64-SAME: {{^}} "-internal-isystem" "[[RESOURCE]]{{[/\\]}}include"
+// CHECK-64-SAME: {{^}} "-internal-isystem"
"[[SYSROOT]]/usr/lib/gcc/x86_64-pc-msys/10/../../../../x86_64-pc-msys/include"
+// CHECK-64-SAME: "-internal-externc-isystem" "[[SYSROOT]]/include"
+// CHECK-64-SAME: {{^}} "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+// CHECK-64-SAME: {{^}} "-internal-externc-isystem"
"[[SYSROOT]]/usr/include/w32api"
+// CHECK-64-SAME: "-femulated-tls"
+// CHECK-64-SAME: "-exception-model=seh"
+// CHECK-64: "{{.*}}gcc"
+// CHECK-64-SAME: "-m64"
+
+// RUN: %clang -### %s --target=x86_64-pc-cygwin
--sysroot=%S/Inputs/basic_cygwin_tree \
+// RUN: --stdlib=platform -static 2>&1 | FileCheck
--check-prefix=CHECK-64-STATIC %s
+// CHECK-64-STATIC: "-cc1" "-triple" "x86_64-pc-windows-cygnus"
+// CHECK-64-STATIC-SAME: "-static-define"
+// CHECK-64-STATIC: "{{.*}}gcc"
+// CHECK-64-STATIC-SAME: "-static"
+
+// RUN: %clang -### %s --target=x86_64-pc-cygwin
--sysroot=%S/Inputs/basic_cygwin_tree \
+// RUN: -shared 2>&1 | FileCheck --check-prefix=CHECK-64-SHARED %s
+// CHECK-64-SHARED: "{{.*}}gcc"
+// CHECK-64-SHARED-SAME: "-shared"
+
+// RUN: %clang -### -o %t %s 2>&1 -no-integrated-as -fuse-ld=ld \
+// RUN: --gcc-toolchain=%S/Inputs/basic_cross_cygwin_tree/usr \
+// RUN: --target=x86_64-pc-cygwin \
+// RUN: | FileCheck --check-prefix=CHECK-64-CROSS %s
+// CHECK-64-CROSS: "-cc1" "-triple" "x86_64-pc-windows-cygnus"
+// CHECK-64-CROSS:
"{{.*}}/Inputs/basic_cross_cygwin_tree/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/as"
"--64"
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