> breaks libstdc++ for powerpc*-unknown-linux-gnu on systems where long
> double is 128 bits, resulting in lots of "undefined reference" errors
> during linking. The change from "# undef" to "#undef" causes a match
> in a sed command in libstdc++-v3/include/Makefile, which looks for
> "^#undef _GLIBCXX_LONG_DOUBLE_COMPAT. Please revert it for now.
Hi Janis. I have been able to reproduce this (finally), and have
checked in the attached patch to fix it.
tested x86_64/linux
tested powerpc64/linux --with-long-double-128
-benjamin
2008-05-01 Benjamin Kosnik <[EMAIL PROTECTED]>
* include/bits/c++config: Revert _GLIBCXX_LONG_DOUBLE_COMPAT change.
Index: include/bits/c++config
===================================================================
--- include/bits/c++config (revision 134869)
+++ include/bits/c++config (working copy)
@@ -212,12 +212,11 @@
// XXX GLIBCXX_ABI Deprecated
// Define if compatibility should be provided for -mlong-double-64
-#if defined __cplusplus && defined __LONG_DOUBLE_128__
#undef _GLIBCXX_LONG_DOUBLE_COMPAT
-#endif
// Namespace associations for long double 128 mode.
-#ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
+#if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__ \
+ && defined __cplusplus
namespace std
{
inline namespace __gnu_cxx_ldbl128 { }
