[R-SIG-Mac] new compilers from Apple

[John C. Tull]

Jan,

Can you elaborate on how you invoke these settings for a R-devel  
build? Do you pass these along in a Terminal session, assuming BASH  
shell, via a series of export commands? I'd like to build this myself  
using llvm and see how it turns out.

Certainly, speeding up compile times is a nice benefit. Have you  
tested any R commands to compare performance of this build versus  
gcc-4.2? I wonder if the gains are passed along to application  
performance as well.

Thanks,
John

On Oct 26, 2009, at 11:18 PM, Jan de Leeuw wrote:

> The following setup on SL compiles R-devel and passes check.
>
>  C compiler:                /Developer/usr/bin/llvm-gcc -std=gnu99 - 
> m64 -O4 -Wall -fopenmp -mtune=native
>  Fortran 77 compiler:       /usr/local/bin/gfortran-4.5 -m64 -O4 - 
> Wall -fopenmp -mtune=native
>  C++ compiler:              /Developer/usr/bin/llvm-g++ -m64 -O4 - 
> Wall -fopenmp -mtune=native
>  Fortran 90/95 compiler:    /usr/local/bin/gfortran-4.5 -m64 -O4 - 
> Wall -fopenmp -mtune=native
>  Obj-C compiler:	     /Developer/usr/bin/llvm-gcc -m64 -O4 -Wall - 
> fopenmp -mtune=native
>
> This compiles at breakneck speed (compared to gcc-4.2 or gcc-4.5).  
> In fact, with recommended packages,
> for all of R-devel:
>
> time make -j8
> real	2m33.028s
> user	3m59.076s
> sys	0m33.248s
>
> NB: I still have problems with CC and OBJC equal to clang (from Apple)
> or to clang (from the llvm svn), even without the -fopenmp flag.
>
> ===============================================================
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