26.09.2012 22:57, Thierry Vignaud kirjoitti: > On 26 September 2012 20:30, Anssi Hannula <[email protected]> wrote: >>> Author >>> tv >> >>> Log Message >>> >>> build with -fPIC on x86_64 too (pok, mdv) >> >> Why? > > "-fPIC should already be used on x86_64 or you'll get sooner or later in > troubles (for instance when linking libs). I think that any sane build > script should already default to -fPIC on x86_64 but some other weird > build script may not." (rtp)
I have to strongly disagree with this. - This hides problems in build scripts. Shared libraries should normally be linked with -fPIC on *all* architectures. Not doing this causes some issues, like the library to actually become unshareable across different processes. Since these are allowed in iX86 but not on x86_64, building all objects on x86_64 with -fPIC will hide any "missing -fPIC from build script" issues. Note that there can't be very many problematic failing packages, since we and mdv have managed this far without it. - It is not needed except on shared libraries, and will cause a small performance penalty (due to one less register being available when using relative addressing). (AFAIU it is negligible, but still..) - Other major distros (not counting MDV) do not do this -- Anssi Hannula
