[lttng-dev] [URCU PATCH] readme: state correct GCC dependency for ARM

[Mathieu Desnoyers]

* Gerlando Falauto (gerlando.falauto at keymile.com) wrote:
> 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.

Merged, thanks!

Mathieu

> ---
>  README |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
> 
> 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:
>  
> -- 
> 1.7.1
> 
> 
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> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com