add missing comment to wfstack.c

[urcu.git] / README

diff --git a/README b/README
index 2687382e2bc785ac9db704f4f01aea2eab7ce18e..796b9cfcd4dbad1d87775b22e53559dcdf7df7ed 100644 (file)
--- a/README
+++ b/README
@@ -25,8 +25,22 @@ ARCHITECTURES SUPPORTED
 -----------------------
 
 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.
+ARMv7l, Alpha, ia64 and Sparcv9 32/64 are supported. Only tested on Linux so
+far, but should theoretically work on other operating systems.
+
+ARMv7l depends on running a Linux kernel 2.6.15 or better.
+
+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
+- Alpha, ia64 and ARMv7l architectures depend on 4.x gcc with atomic builtins
+  support.
+
 
 QUICK START GUIDE
 -----------------