[libc][test] split exit tests into two separate tests (llvm#166355)

_Exit(3) is a fairly simple syscall wrapper whereas exit(3) calls
atexit-registered functions + whole lot of stuff that require support
for sync primitives.

Splitting the tests allows testing the former easily (especially for new
port projects)

---------

Signed-off-by: Shreeyash Pandey <[email protected]>

Author: bojle

libc/cmake/modules/LLVMLibCArchitectures.cmake

@@ -215,6 +215,37 @@ else()
           "Unsupported libc target operating system ${LIBC_TARGET_OS}")
 endif()
 
+# If the compiler target triple is not the same as the triple specified by
+# LIBC_TARGET_TRIPLE or LLVM_RUNTIMES_TARGET, we will add a --target option
+# if the compiler is clang. If the compiler is GCC we just error out as there
+# is no equivalent of an option like --target.
+if(explicit_target_triple AND
+   (NOT (libc_compiler_triple STREQUAL explicit_target_triple)))
+  set(LIBC_CROSSBUILD TRUE)
+  if(CMAKE_COMPILER_IS_GNUCXX)
+    message(FATAL_ERROR
+            "GCC target triple (${libc_compiler_triple}) and the explicity "
+            "specified target triple (${explicit_target_triple}) do not match.")
+  else()
+    list(APPEND
+         LIBC_COMPILE_OPTIONS_DEFAULT "--target=${explicit_target_triple}")
+  endif()
+endif()
+
+if(LIBC_TARGET_OS_IS_DARWIN)
+  execute_process(
+    COMMAND xcrun --sdk macosx --show-sdk-path
+    OUTPUT_VARIABLE MACOSX_SDK_PATH
+    RESULT_VARIABLE MACOSX_SDK_PATH_RESULT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  if(MACOSX_SDK_PATH_RESULT EQUAL 0)
+    list(APPEND LIBC_COMPILE_OPTIONS_DEFAULT "-I" "${MACOSX_SDK_PATH}/usr/include")
+  else()
+    message(WARNING "Could not find macOS SDK path. `xcrun --sdk macosx --show-sdk-path` failed.")
+  endif()
+endif()
+
 # Windows does not support full mode build.
 if (LIBC_TARGET_OS_IS_WINDOWS AND LLVM_LIBC_FULL_BUILD)
   message(FATAL_ERROR "Windows does not support full mode build.")

libc/include/sys/syscall.h.def

@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SYS_SYSCALL_H
 #define LLVM_LIBC_SYS_SYSCALL_H
 
-//TODO: Handle non-linux syscalls
+#if defined(__linux__)
 
 #include <asm/unistd.h>
 
@@ -2361,5 +2361,6 @@
 #define SYS_writev __NR_writev
 #endif
 
+#endif // __linux__
 
 #endif // LLVM_LIBC_SYS_SYSCALL_H

libc/test/UnitTest/ExecuteFunctionUnix.cpp

@@ -57,9 +57,7 @@ ProcessStatus invoke_in_subprocess(FunctionCaller *func, int timeout_ms) {
   }
   ::close(pipe_fds[1]);
 
-  struct pollfd poll_fd {
-    pipe_fds[0], 0, 0
-  };
+  pollfd poll_fd{pipe_fds[0], POLLIN, 0};
   // No events requested so this call will only return after the timeout or if
   // the pipes peer was closed, signaling the process exited.
   if (::poll(&poll_fd, 1, timeout_ms) == -1) {

libc/test/src/stdlib/CMakeLists.txt

@@ -398,6 +398,19 @@ if(LLVM_LIBC_FULL_BUILD)
       libc-stdlib-tests
     SRCS
       _Exit_test.cpp
+    DEPENDS
+      libc.src.__support.OSUtil.osutil
+      libc.src.stdlib._Exit
+  )
+
+  add_libc_test(
+    exit_test
+    # The EXPECT_EXITS test is only availible for unit tests.
+    UNIT_TEST_ONLY
+    SUITE
+      libc-stdlib-tests
+    SRCS
+      exit_test.cpp
     DEPENDS
       libc.src.stdlib._Exit
       libc.src.stdlib.exit

libc/test/src/stdlib/_Exit_test.cpp

@@ -7,13 +7,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/stdlib/_Exit.h"
-#include "src/stdlib/exit.h"
 #include "test/UnitTest/Test.h"
 
 TEST(LlvmLibcStdlib, _Exit) {
   EXPECT_EXITS([] { LIBC_NAMESPACE::_Exit(1); }, 1);
   EXPECT_EXITS([] { LIBC_NAMESPACE::_Exit(65); }, 65);
-
-  EXPECT_EXITS([] { LIBC_NAMESPACE::exit(1); }, 1);
-  EXPECT_EXITS([] { LIBC_NAMESPACE::exit(65); }, 65);
 }

libc/test/src/stdlib/exit_test.cpp

@@ -0,0 +1,15 @@
+//===-- Unittests for exit -----------------------------------------------===//
+//
+// 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 "src/stdlib/exit.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdlib, exit) {
+  EXPECT_EXITS([] { LIBC_NAMESPACE::exit(1); }, 1);
+  EXPECT_EXITS([] { LIBC_NAMESPACE::exit(65); }, 65);
+}