Transactional Memory (TM) in GCC 4.7 breaks uClinux -msep-data (-fPIC)
Larry Baker <[email protected]>
| Newsgroups | gmane.linux.uclinux.devel |
|---|---|
| Message-ID | <[email protected]> |
See my posting at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54584, Bug 54584 - m68k-uclinux error: Link tests are not allowed after GCC_NO_EXECUTABLES. The problem is a program always includes a size 0 section, .tm_clone_table, from crtbegin.o/crtend.o (libgcc/crtstuff.c), even though the program does not use the -gnu-tm option. I'm guessing the .tm_clone_table __attribute__ ((used)) results in the ALLOC flag for the section, which causes the linker (ld? elf2flt?) to croak when there is nothing to allocate. Linking without -elf2flt does not fail, and results in an image without a .tm_clone_table section. I don't know why the linker for -msep-data/-fPIC code can't figure out how to do the same thing. My workaround is to disable USE_TM_CLONE_REGISTRY in gcc/config/m68k/uclinux.h (this patch is good for both GCC 4.7 and GCC 4.8): --- gcc-4.7-20120908/gcc/config/m68k/uclinux.h +++ gcc-4.7-20120908-patched/gcc/config/m68k/uclinux.h @@ -22,2 +22,4 @@ +/* Do not use TM clone registry. It breaks -msep-data (-fPIC) code. */ +#define USE_TM_CLONE_REGISTRY 0 #undef STARTFILE_SPEC Larry Baker US Geological Survey 650-329-5608 [email protected] _______________________________________________ uClinux-dev mailing list [email protected] http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by [email protected] To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev