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// Check that SDKROOT is used to define the default for -isysroot on Darwin.
//
// RUN: rm -rf %t.tmpdir
// RUN: mkdir -p %t.tmpdir
// RUN: env SDKROOT=%t.tmpdir %clang -target x86_64-apple-darwin10 \
// RUN: -c %s -### 2> %t.log
// RUN: FileCheck --check-prefix=CHECK-BASIC < %t.log %s
//
// CHECK-BASIC: clang
// CHECK-BASIC: "-cc1"
// CHECK-BASIC: "-isysroot" "{{.*tmpdir}}"
// Check that we don't use SDKROOT as the default if it is not a valid path.
//
// RUN: rm -rf %t.nonpath
// RUN: env SDKROOT=%t.nonpath %clang -target x86_64-apple-darwin10 \
// RUN: -c %s -### 2> %t.log
// RUN: FileCheck --check-prefix=CHECK-NONPATH < %t.log %s
//
// CHECK-NONPATH: clang
// CHECK-NONPATH: "-cc1"
// CHECK-NONPATH-NOT: "-isysroot"
// Check that we don't use SDKROOT as the default if it is just "/"
//
// RUN: env SDKROOT=/ %clang -target x86_64-apple-darwin10 \
// RUN: -c %s -### 2> %t.log
// RUN: FileCheck --check-prefix=CHECK-NONROOT < %t.log %s
//
// CHECK-NONROOT: clang
// CHECK-NONROOT: "-cc1"
// CHECK-NONROOT-NOT: "-isysroot"
//
// It doesn't make sense on msys bash.
// REQUIRES: shell-preserves-root
//
// This test will fail with MSYS env.exe, since it does not preserve root,
// expanding / into C:/MINGW/MSYS/1.0. To see the problem, from cmd.exe run:
//
// env SDKROOT=/ cmd //c echo %SDKROOT%
//
// This test passes using env.exe from GnuWin32.
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