[libc][NFC] Move ExecuteFunction test util to test/UnitTest.

libc/test/UnitTest/CMakeLists.txt

-add_library(
-  LibcUnitTest
+set(libc_unit_test_srcs
+  ExecuteFunction.h
   Test.h
   LibcTest.cpp
   LibcTest.h
   TestLogger.cpp
   TestLogger.h
 )
+
+if(${LIBC_TARGET_OS} STREQUAL "linux")
+  list(APPEND libc_unit_test_srcs ExecuteFunctionUnix.cpp)
+endif()
+
+add_library(
+  LibcUnitTest
+  ${libc_unit_test_srcs}
+)
+
 target_include_directories(LibcUnitTest PUBLIC ${LIBC_SOURCE_DIR})
 add_dependencies(
   LibcUnitTest
   libc.src.__support.CPP.string
   libc.src.__support.CPP.string_view
   libc.src.__support.CPP.type_traits
   libc.src.__support.OSUtil.osutil
   libc.src.__support.uint128)

libc/test/UnitTest/ExecuteFunction.h

bool timed_out() const {
     return failure == reinterpret_cast<const char *>(TIMEOUT);
   }
   const char *get_error() const { return timed_out() ? nullptr : failure; }
   bool exited_normally();
   int get_exit_code();
   int get_fatal_signal();
 };
 
-ProcessStatus invoke_in_subprocess(FunctionCaller *func,
-                                   unsigned timeout_ms = ProcessStatus::TIMEOUT);
+ProcessStatus
+invoke_in_subprocess(FunctionCaller *func,
 
 const char *signal_as_string(int signum);
 
 } // namespace testutils
 } // namespace __llvm_libc
 
 #endif // LLVM_LIBC_UTILS_TESTUTILS_EXECUTEFUNCTION_H

libc/test/UnitTest/LibcTest.h

 // This file can only include headers from src/__support/CPP/ or
 // utils/testutils. No other headers should be included.
 
 #include "PlatformDefs.h"
 
 #include "src/__support/CPP/string.h"
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/CPP/type_traits.h"
+#include "test/UnitTest/ExecuteFunction.h"
 #include "test/UnitTest/TestLogger.h"
-#include "utils/testutils/ExecuteFunction.h"
 
 namespace __llvm_libc {
 namespace testing {
 
 class RunContext;
 
 // Only the following conditions are supported. Notice that we do not have
 // a TRUE or FALSE condition. That is because, C library funtions do not

libc/test/UnitTest/LibcTest.cpp

 //===-- Implementation of the base class for libc unittests----------------===//
 //
 // 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 "LibcTest.h"
 
 #include "src/__support/CPP/string.h"
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/UInt128.h"
+#include "test/UnitTest/ExecuteFunction.h"
 #include "test/UnitTest/TestLogger.h"
-#include "utils/testutils/ExecuteFunction.h"
 #include <cassert>
 
 namespace __llvm_libc {
 namespace testing {
 
 // This need not be a class as all it has is a single read-write state variable.
 // But, we make it class as then its implementation can be hidden from the
 // header file.

libc/utils/testutils/CMakeLists.txt

-if(CMAKE_HOST_UNIX)
-  set(EFFile ExecuteFunctionUnix.cpp)
-endif()
-
 add_library(
   libc_test_utils
-  ${EFFile}
-  ExecuteFunction.h
   RoundingModeUtils.cpp
 )

utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel

deps = [
         "//libc:__support_osutil_io",
         "//libc:libc_root",
     ],
 )
 
 cc_library(
     name = "LibcUnitTest",
     srcs = [
+        "ExecuteFunctionUnix.cpp",
         "LibcTest.cpp",
         "LibcTestMain.cpp",
     ],
     hdrs = [
+        "ExecuteFunction.h",
         "LibcTest.h",
         "PlatformDefs.h",
         "Test.h",
     ],
     deps = [
         ":test_logger",
         "//libc:__support_cpp_bit",
         "//libc:__support_cpp_bitset",

utils/bazel/llvm-project-overlay/libc/utils/testutils/BUILD.bazel

 # This file is licensed 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
 
 package(default_visibility = ["//visibility:public"])
 
 licenses(["notice"])
 
 cc_library(
     name = "libc_test_utils",
     srcs = [
-        "ExecuteFunctionUnix.cpp",
         "RoundingModeUtils.cpp",
     ],
     hdrs = [
-        "ExecuteFunction.h",
         "RoundingModeUtils.h",
     ],
     deps = [
         "//libc:libc_root",
         "//llvm:Support",
     ],
 )