Enable building of sanitizers on FreeBSD

[kutuzov.viktor.84]

Summary

This patch enables building of the asan, lsan, profile and ubsan parts of sanitizer on FreeBSD.

I'm not sure if we should commit this patch first or last. In the latter case and before the patch is committed, it can work as a reference for those who would like to try to build the sources on FreeBSD.

[samsonov]

LGTM.

I'm going to commit this patch so that other FreeBSD folks may try building ASan. I will revert it if it cause problems or build failures.

[samsonov]

Submitted as r201783.

[kutuzov.viktor.84]

As of rL205847, it runs 'make check-all' with no unexpected failures on FreeBSD 9.2 so I propose that we re-apply this patch.

The config used for the build is this:

.
# we have to install these from ports as the packages versions are too old
cd /usr/ports/devel/subversion
sudo make BATCH=1 install clean

cd /usr/ports/devel/libc++
sudo make BATCH=1
sudo make PREFIX=/usr install clean

cd /usr/src/lib/libcxxrt
sudo make
sudo make install clean

cd /usr/ports/shells/bash
sudo make BATCH=1 install clean

cd /usr/ports/textproc/gnugrep
sudo make BATCH=1 install clean

wget -c ftp://ftp.gnu.org/gnu/binutils/binutils-2.24.tar.gz
./configure --prefix=/usr --enable-language=c,c++
gmake
sudo gmake install

# these are necessary to pass LLVM :: BugPoint/compile-custom.ll
sudo pkg install gcc
sudo pkg install python

CC=clang CXX=clang++ cmake \
    -DCMAKE_CXX_FLAGS="-std=c++11 -stdlib=libc++" \
    -DCMAKE_EXE_LINKER_FLAGS="-lcxxrt" \
    -DCMAKE_CXX_COMPILER_FORCED=1

[kutuzov.viktor.84]

Committed rL205919.

lib/CMakeLists.txt

 # First, add the subdirectories which contain feature-based runtime libraries
 # and several convenience helper libraries.
 
 include(AddCompilerRT)
 include(SanitizerUtils)
 # Don't build sanitizers in the bootstrap build.
 if(NOT LLVM_USE_SANITIZER)
-  # AddressSanitizer is supported on Linux and Mac OS X.
+  # AddressSanitizer is supported on Linux, FreeBSD and Mac OS X.
   # 32-bit Windows support is experimental.
-  if(CMAKE_SYSTEM_NAME MATCHES "Darwin|Linux")
+  if(CMAKE_SYSTEM_NAME MATCHES "Darwin|Linux|FreeBSD")
     set(SUPPORTS_BUILDING_ASAN TRUE)
   elseif(CMAKE_SYSTEM_NAME MATCHES "Windows"
          AND MSVC AND CMAKE_SIZEOF_VOID_P EQUAL 4)
     set(SUPPORTS_BUILDING_ASAN TRUE)
   else()
     set(SUPPORTS_BUILDING_ASAN FALSE)
   endif()
   if(SUPPORTS_BUILDING_ASAN)
     add_subdirectory(asan)
     add_subdirectory(interception)
     add_subdirectory(sanitizer_common)
   endif()
-  if(CMAKE_SYSTEM_NAME MATCHES "Darwin|Linux" AND NOT ANDROID)
-    # LSan, UBsan and profile can be built on Mac OS and Linux.
+  if(CMAKE_SYSTEM_NAME MATCHES "Darwin|Linux|FreeBSD" AND NOT ANDROID)
+    # LSan, UBsan and profile can be built on Mac OS, FreeBSD and Linux.
     add_subdirectory(lsan)
     add_subdirectory(profile)
     add_subdirectory(ubsan)
   endif()
   if(CMAKE_SYSTEM_NAME MATCHES "Linux" AND NOT ANDROID)
     # ThreadSanitizer and MemorySanitizer are supported on Linux only.
     add_subdirectory(tsan)
     add_subdirectory(msan)
     add_subdirectory(msandr)
     add_subdirectory(dfsan)
   endif()
 endif()
 
 add_subdirectory(builtins)