From: Gerlando Falauto Date: Wed, 21 Dec 2011 14:50:38 +0000 (-0500) Subject: readme: state correct GCC dependency for ARM X-Git-Tag: v0.7.0~51 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=d68d00f8d64d8d21b0d8d5ca89f649f77e5c8164;p=userspace-rcu.git readme: state correct GCC dependency for ARM If you are trying to compile liburcu for ARM and get errors like: /usr/local/include/urcu/uatomic/generic.h:180: undefined reference to `__sync_add_and_fetch_4' usr/local/lib/liburcu-common.so: undefined reference to `__sync_lock_test_and_set_4' /usr/local/lib/liburcu.so: undefined reference to `__sync_or_and_fetch_4' please upgrade your GCC to 4.4. Signed-off-by: Mathieu Desnoyers --- diff --git a/README b/README index ce25e3a..104ef2a 100644 --- a/README +++ b/README @@ -29,7 +29,7 @@ Currently, x86 (i386, i486, i586, i686), x86 64-bit, PowerPC 32/64, S390, S390x, ARM, Alpha, ia64 and Sparcv9 32/64 are supported. Only tested on Linux so far, but should theoretically work on other operating systems. -ARM depends on running a Linux kernel 2.6.15 or better. +ARM depends on running a Linux kernel 2.6.15 or better, GCC 4.4 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: @@ -41,8 +41,9 @@ supported, with the following exceptions: http://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg281255.html - gcc 3.3 cannot match the "xchg" instruction on 32-bit x86 build. See: http://kerneltrap.org/node/7507 -- Alpha, ia64 and ARM architectures depend on 4.x gcc with atomic builtins - support. +- Alpha, ia64 and ARM architectures depend on gcc 4.x with atomic builtins + support. For ARM this was introduced with gcc 4.4: + http://gcc.gnu.org/gcc-4.4/changes.html For developers using the git tree: