Fix powerpc uatomic 4-byte cmpxchg (cmpd -> cmpw)

[urcu.git] / README

diff --git a/README b/README
index 1cd3ed954fbd780e83fab12a6fe85f960e84ae95..4423fc53821c0c62244481cd8e94d8e4c837fc4f 100644 (file)
--- a/README
+++ b/README
@@ -31,6 +31,15 @@ theoretically work on other operating systems.
 Alpha and ia64 architectures are supported, but depend on 4.x gcc with atomic
 builtins support.
 
 Alpha and ia64 architectures are supported, but depend on 4.x gcc with atomic
 builtins support.
 

+The gcc compiler versions 3.3, 3.4, 4.0, 4.1, 4.2, 4.3, 4.4 and 4.5 are
+supported, with the following exceptions:
+
+- gcc 3.3 and 3.4 have a bug that prevents them from generating volatile
+  accesses to offsets in a TLS structure on 32-bit x86. These versions are
+  therefore not compatible with liburcu on x86 32-bit (i386, i486, i586, i686).
+  The problem has been reported to the gcc community:
+    http://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg281255.html
+

 QUICK START GUIDE
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 QUICK START GUIDE
 -----------------