Enable ubsan on NetBSD

[krytarowski]

Summary

Part of the code inspired by the original work on libsanitizer in GCC 5.4 by Christos Zoulas.

Sponsored by <The NetBSD Foundation>

[fjricci]

Are there buildbots for NetBSD?

[krytarowski]

In D36483#835849, @fjricci wrote:

Are there buildbots for NetBSD?

Long term, I plan to reuse this one: http://lab.llvm.org:8011/builders/lldb-amd64-ninja-netbsd8?numbuilds=200

cmake/config-ix.cmake

 if (COMPILER_RT_HAS_SANITIZER_COMMON AND TSAN_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Darwin|Linux|FreeBSD|Android")
   set(COMPILER_RT_HAS_TSAN TRUE)
 else()
   set(COMPILER_RT_HAS_TSAN FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND UBSAN_SUPPORTED_ARCH AND
-    OS_NAME MATCHES "Darwin|Linux|FreeBSD|Windows|Android|Fuchsia")
+    OS_NAME MATCHES "Darwin|Linux|FreeBSD|NetBSD|Windows|Android|Fuchsia")
   set(COMPILER_RT_HAS_UBSAN TRUE)
 else()
   set(COMPILER_RT_HAS_UBSAN FALSE)
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND SAFESTACK_SUPPORTED_ARCH AND
     OS_NAME MATCHES "Darwin|Linux|FreeBSD")
   set(COMPILER_RT_HAS_SAFESTACK TRUE)

lib/ubsan/ubsan_platform.h

 //===-- ubsan_platform.h ----------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Defines the platforms which UBSan is supported at.
 //
 //===----------------------------------------------------------------------===//
 #ifndef UBSAN_PLATFORM_H
 #define UBSAN_PLATFORM_H
 
 // Other platforms should be easy to add, and probably work as-is.
-#if (defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)) && \
-    (defined(__x86_64__) || defined(__i386__) || defined(__arm__) || \
-     defined(__aarch64__) || defined(__mips__) || defined(__powerpc64__) || \
+#if (defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) ||       \
+     defined(__NetBSD__)) &&                                                   \
+    (defined(__x86_64__) || defined(__i386__) || defined(__arm__) ||           \
+     defined(__aarch64__) || defined(__mips__) || defined(__powerpc64__) ||    \
      defined(__s390__))
 # define CAN_SANITIZE_UB 1
 #elif defined(_WIN32) || defined(__Fuchsia__)
 # define CAN_SANITIZE_UB 1
 #else
 # define CAN_SANITIZE_UB 0
 #endif
 
 #endif

test/ubsan/TestCases/Float/cast-overflow.cpp

 
 // This test assumes float and double are IEEE-754 single- and double-precision.
 
 #if defined(__APPLE__)
 # include <machine/endian.h>
 # define BYTE_ORDER __DARWIN_BYTE_ORDER
 # define BIG_ENDIAN __DARWIN_BIG_ENDIAN
 # define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__NetBSD__)
 # include <sys/endian.h>
-# define BYTE_ORDER _BYTE_ORDER
-# define BIG_ENDIAN _BIG_ENDIAN
-# define LITTLE_ENDIAN _LITTLE_ENDIAN
+# ifndef BYTE_ORDER
+#  define BYTE_ORDER _BYTE_ORDER
+# endif
+# ifndef BIG_ENDIAN
+#  define BIG_ENDIAN _BIG_ENDIAN
+# endif
+# ifndef LITTLE_ENDIAN
+#  define LITTLE_ENDIAN _LITTLE_ENDIAN
+# endif
 #elif defined(_WIN32)
 # define BYTE_ORDER 0
 # define BIG_ENDIAN 1
 # define LITTLE_ENDIAN 0
 #else
 # include <endian.h>
 # define BYTE_ORDER __BYTE_ORDER
 # define BIG_ENDIAN __BIG_ENDIAN

test/ubsan/lit.common.cfg

 config.substitutions.append( ("%clang ", build_invocation(clang_ubsan_cflags)) )
 config.substitutions.append( ("%clangxx ", build_invocation(clang_ubsan_cxxflags)) )
 config.substitutions.append( ("%gmlt ", " ".join(config.debug_info_flags) + " ") )
 
 # Default test suffixes.
 config.suffixes = ['.c', '.cc', '.cpp']
 
 # Check that the host supports UndefinedBehaviorSanitizer tests
-if config.host_os not in ['Linux', 'Darwin', 'FreeBSD', 'Windows']:
+if config.host_os not in ['Linux', 'Darwin', 'FreeBSD', 'Windows', 'NetBSD']:
   config.unsupported = True
 
 # Allow tests to use REQUIRES=stable-runtime.  For use when you cannot use XFAIL
 # because the test hangs or fails on one configuration and not the other.
 if config.target_arch.startswith('arm') == False and config.target_arch != 'aarch64':
   config.available_features.add('stable-runtime')
 
 config.available_features.add('arch=' + config.target_arch)