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

[urcu.git] / README

diff --git a/README b/README
index a2ca1eb147a7318845ac0da336ff40ba5ba86f22..4423fc53821c0c62244481cd8e94d8e4c837fc4f 100644 (file)
--- a/README
+++ b/README
@@ -28,6 +28,18 @@ Currently, x86 (i386, i486, i586, i686), x86 64-bit, PowerPC 32/64, S390, S390x
 and Sparcv9 32/64 are supported. Only tested on Linux so far, but should
 theoretically work on other operating systems.
 
+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
 -----------------
 
@@ -71,7 +83,8 @@ Usage of liburcu-mb
 
 Usage of liburcu-signal
 
-       * #include <urcu-signal.h>
+       * #include <urcu.h>
+       * Compile any _LGPL_SOURCE code using this library with "-DRCU_SIGNAL".
        * Link the application with "-lurcu-signal".
        * Version of the library that requires a signal, typically SIGUSR1. Can
          be overridden with -DSIGRCU by modifying Makefile.build.inc.