[Rd] gcc optimization flag when building R
Peter Dalgaard
p.dalgaard at biostat.ku.dk
Fri Aug 20 20:15:13 CEST 2004
"Vadim Ogranovich" <vograno at evafunds.com> writes:
> Hi,
>
> I am building R on RH Linux 7.3 and I noticed that ./configure does not
> set the optimization flag, -O or -O2, for gcc, but does set for g++ and
> g77. Why is that? Should I try to set it manually, if yes how?
>
> Thanks,
> Vadim
>
> P.S. This is the bottom portion of the ./configure run
>
>
> R is now configured for i686-pc-linux-gnu
>
> Source directory: .
> Installation directory: /usr/local
>
> C compiler: gcc -D__NO_MATH_INLINES -mieee-fp -DNO_PURE
> -Wchar-subscripts -Wformat -Wimplicit -Wreturn-type -Wswitch -Wreorder
> -Wwrite-strings -Woverloaded-virtual -Wshadow -Wno-ctor-dtor-privacy
> -m486 -fPIC -DOSRELMAJOR=2 -DOSRELMINOR=4
> C++ compiler: g++ -mieee-fp -g -O2
> Fortran compiler: g77 -mieee-fp -g -O2
Something appears to be setting a load of CFLAGS that are not usually
there, though. If you have set CFLAGS on the make line or in a config.site
file, just include -g -O2
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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