Thanks for the info. I hope, below is the patch (which is mentioned in the url you shared) solving this problem: https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=229021 Am i right?. If so, do we have any release at which this patch is available?. Regards, Madan On Sun, Jul 31, 2016 at 11:28 PM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 31 July 2016 at 15:39, madana gopal wrote: >> Hi, >> >> I am compiling below code with c++1y flag with gcc 4.9. >> >> #include <stdio.h> >> register unsigned long sp asm ("sp"); >> int main() >> { >> printf("[%d] \n",((unsigned long)(sp) >= 5)); >> return 0; >> } >> >> I got the error as "Expected address of explicit register variable >> sp". Here, the error is coming from the expression (sp). But it is not >> coming when i use gcc4.9 without c++1y flag. >> gcc4.9 is mandatory to be used in my project. Please let me know, what >> is resolution for this ( any flags) or the reason for this in c++1y. > > It might be related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67064
