[libcxxabi] Introduce a -fno-exceptions libc++abi libary variant

Currently there is only support for a -fno-exceptions libc++ build. This is
problematic for functions such as std::terminate() which are defined in
libc++abi and using any of those functions throws away most of the benefits
of using -fno-exceptions (code-size). This patch introduces a -fno-exceptions
libc++abi build to address this issue.

This new variant of libc++abi cannot be linked against any with-exceptions
code as some symbols necessary for handling exceptions are missing in this
library.

Differential revision: http://reviews.llvm.org/D20677

Reviewers: EricWF, mclow.lists, bcraig

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@271267 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 1 deletions

diff --git a/test/libcxxabi/test/config.py b/test/libcxxabi/test/config.py
index 766cdfa..c8a6af0 100644
--- a/test/libcxxabi/test/config.py
+++ b/test/libcxxabi/test/config.py
@@ -35,12 +35,17 @@ class Configuration(LibcxxConfiguration):
 
     def configure_features(self):
         super(Configuration, self).configure_features()
+        if not self.get_lit_bool('enable_exceptions', True):
+            self.config.available_features.add('libcxxabi-no-exceptions')
         if self.get_lit_bool('thread_atexit', True):
             self.config.available_features.add('thread_atexit')
 
     def configure_compile_flags(self):
         self.cxx.compile_flags += ['-DLIBCXXABI_NO_TIMER']
-        self.cxx.compile_flags += ['-funwind-tables']
+        if self.get_lit_bool('enable_exceptions', True):
+            self.cxx.compile_flags += ['-funwind-tables']
+        else:
+            self.cxx.compile_flags += ['-fno-exceptions', '-DLIBCXXABI_HAS_NO_EXCEPTIONS']
         if not self.get_lit_bool('enable_threads', True):
             self.cxx.compile_flags += ['-DLIBCXXABI_HAS_NO_THREADS=1']
         super(Configuration, self).configure_compile_flags()