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

[Yannick Brosseau]

We can add a configure check for this version dependency

On 2011-12-21 09:51, Mathieu Desnoyers wrote:
> * 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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