Peter Tyser ptyser@xes-inc.com wrote on 28/09/2009 17:08:58:
Peter, I just discovered that my gcc 3.4.6 allows me to use -mrelocatable with -fpie -fpie is about the same as -fpic and -fPIE is similar to -fPIC -fpie generates smaller code so one could consider using -fpie and -mrelocatable However -fpic/-fpie needs some fixes to the relocation code, but a quick hack by me works on my board.
Does -fpie and -mrelocatable compile for you and do you have a non zero
fixup section?
-fpie and -mrelocatable does compile for me (tested on the XPedite5370 with gcc 4.2.2) and has a non-zero fixup section. However, the -fpie U-Boot image is slightly larger:
ptyser@petert u-boot $ size u-boot.PIC text data bss dec hex filename 304300 28644 33156 366100 59614 u-boot.PIC
ptyser@petert u-boot $ size u-boot.pie text data bss dec hex filename 304508 28624 33156 366288 596d0 u-boot.pie
Let me know if I can provide any additional detail.
ehh, that is strange. Did you run a make clean in between? Do you see any "bl _GLOBAL_OFFSET_TABLE_@local-4" if you generate assembler(-S)? Maybe you had both -fPIC and -fpie defined?
Seems like I was in a hurry, -fpie and -mrelocatable appears to silently transform into -fPIE -mrelocatable so no gain there.
Jocke