llvm-project/clang/test/Driver/emulated-tls.cpp

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// Cygwin uses emutls. Clang should pass -femulated-tls to cc1 and cc1 should pass EmulatedTLS to LLVM CodeGen.
// FIXME: Add more targets here to use emutls.
// RUN: %clang -### -std=c++11 -target i686-pc-cygwin %s 2>&1 | FileCheck %s
// CHECK: "-cc1" {{.*}}"-femulated-tls"