[libcxx] Fix definition of regex_traits::__regex_word on big-endian glibc systems
Summary:
On glibc, the bits used for the various character classes is endian dependant
(see _ISbit() in ctypes.h) but __regex_word does not account for this and uses
a spare bit that isn't spare on big-endian. On big-endian, it overlaps with the
bit for graphic characters which causes '-', '@', etc. to be considered a word
character.
Fixed this by defining the value using _ISbit(15) on MIPS glibc systems. We've
restricted this to MIPS for now to avoid the risk of introducing failures in
other targets.
Fixes PR26476.
Reviewers: hans, mclow.lists
Subscribers: dsanders, cfe-commits
Differential Revision: http://reviews.llvm.org/D17132
llvm-svn: 261088
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 4788179a2cbb8fceda25751b2bdfc4f3ae2d13d6
diff --git a/include/regex b/include/regex
index f1f3264..1139d8f 100644
--- a/include/regex
+++ b/include/regex
@@ -976,7 +976,12 @@
typedef locale locale_type;
typedef ctype_base::mask char_class_type;
+#if defined(__mips__) && defined(__GLIBC__)
+ static const char_class_type __regex_word = static_cast<char_class_type>(_ISbit(15));
+#else
static const char_class_type __regex_word = 0x80;
+#endif
+
private:
locale __loc_;
const ctype<char_type>* __ct_;