Add support for building libc++ as a 32 bit library

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224096 91177308-0d34-0410-b5e6-96231b3b80d8

test/CMakeLists.txt

@@ -30,6 +30,7 @@ if(PYTHONINTERP_FOUND)
   pythonize_bool(LIBCXX_ENABLE_EXCEPTIONS)
   pythonize_bool(LIBCXX_ENABLE_RTTI)
   pythonize_bool(LIBCXX_ENABLE_SHARED)
+  pythonize_bool(LIBCXX_BUILD_32_BITS)
   pythonize_bool(LIBCXX_ENABLE_THREADS)
   pythonize_bool(LIBCXX_ENABLE_MONOTONIC_CLOCK)
 

test/lit.cfg

@@ -436,6 +436,9 @@ class Configuration(object):
             self.config.available_features.add('rtti')
         else:
             self.compile_flags += ['-fno-rtti', '-D_LIBCPP_NO_RTTI']
+        enable_32bit = self.get_lit_bool('enable_32bit', False)
+        if enable_32bit:
+            self.compile_flags += ['-m32']
         # Configure threading features.
         enable_threads = self.get_lit_bool('enable_threads', True)
         enable_monotonic_clock = self.get_lit_bool('enable_monotonic_clock', True)

test/lit.site.cfg.in

@@ -7,6 +7,7 @@ config.python_executable        = "@PYTHON_EXECUTABLE@"
 config.enable_exceptions        = "@LIBCXX_ENABLE_EXCEPTIONS@"
 config.enable_rtti              = "@LIBCXX_ENABLE_RTTI@"
 config.enable_shared            = "@LIBCXX_ENABLE_SHARED@"
+config.enable_32bit             = "@LIBCXX_BUILD_32_BITS@"
 config.enable_threads           = "@LIBCXX_ENABLE_THREADS@"
 config.enable_monotonic_clock   = "@LIBCXX_ENABLE_MONOTONIC_CLOCK@"
 config.cxx_abi                  = "@LIBCXX_CXX_ABI_LIBNAME@"